Long non-coding RNA MEG3 functions as a competing endogenous RNA to regulate ischemic neuronal death by targeting miR-21/PDCD4 signaling pathway
Open accessAbstract
Long non-coding RNA (lncRNA) maternally expressed gene 3 (MEG3) has been demonstrated as an important regulator in diverse human cancers. However, its function and regulatory mechanism in ischemic stroke remains largely unknown. Here, we report that MEG3 is physically associated with microRNA-21 (miR-21), while miR-21 is downregulated following ischemia in the ischemic core in vitro and in vivo, which is opposite to MEG3. Besides, overexpression of miR-21 protects oxygen–glucose deprivation and reoxygenation (OGD/R)-induced apoptotic cell death. Furthermore, MEG3 functions as a competing endogenous RNAs (ceRNAs) and competes with programmed cell death 4 (PDCD4) mRNA for directly binding to miR-21, which mediates ischemic neuronal death. Knockdown of MEG3 protects against ischemic damage and improves overall neurological functions in vivo. Thus, our data uncovers a novel mechanism of lncRNA MEG3 as a ceRNA by targeting miR-21/PDCD4 signaling pathway in regulating ischemic neuronal death, which may help develop new strategies for the therapeutic interventions in cerebral ischemic stroke.
AI snapshot
Written from the paper’s full text.
TL;DR
Long non-coding RNA MEG3 acts as a competing endogenous RNA for miR-21, preventing miR-21 from repressing PDCD4 and thereby promoting ischemic neuronal death. Knockdown of MEG3 protects against ischemia/reperfusion injury and improves neurological function in mice.
Key findings
- MEG3 is physically associated with miR-21 via predicted binding sites; luciferase reporters with all three miR-21-binding sites mutated did not respond to increasing miR-21, whereas wild-type MEG3 reporters did.
- miR-21 was downregulated after ischemia in vitro and in vivo, opposite to MEG3; miR-21 overexpression increased miR-21 expression ~3-fold, while miR-21 inhibitor reduced it to ~40%, and miR-21 overexpression reduced OGD/R-induced TUNEL-positive apoptotic cell death.
- MEG3 competes with PDCD4 mRNA for binding to miR-21: miR-21 decreased PDCD4 mRNA/protein, but this effect was abolished by MEG3 overexpression and augmented by si-MEG3; MEG3 overexpression also abolished miR-21’s protection against OGD/R-induced neuronal death.
- In vivo, si-MEG3 injection reduced I/R-induced brain infarct volume and neuronal death and improved neurological score, rotarod performance, Morris water maze learning/memory, and open-field locomotor/anxiety-like behavior compared with si-s-MEG3.
Methods
- In vitro: N2a cells subjected to oxygen–glucose deprivation (3 h) followed by reoxygenation for 24, 48, or 72 h; transfection with miR-21 mimic/inhibitor, MEG3-expressing plasmids, si-MEG3, or controls.
- In vivo: adult male C57BL/6 J mice underwent 60-min middle cerebral artery occlusion followed by reperfusion for 24, 48, or 72 h; si-MEG3 or si-s-MEG3 was injected into the lateral ventricle before MCAO.
- Main assays: luciferase reporter assays, MS2-MBP RNA pulldown, qRT-PCR, western blot, TUNEL, TTC staining, Fluoro-Jade C staining, neurological deficit scoring, rotarod, Morris water maze, and open-field tests; statistics used GraphPad Prism with Student’s t-test and P < 0.05 significance.
Limitations
- The paper states that it did not exclude other targets of MEG3 or miR-21 that may contribute to ischemic neuronal death, and notes that PDCD4 is not the only miR-21 target and miR-21 is not the only MEG3 target.
- The paper states that whether MEG3/miR-21 targets crosstalk with the previously reported MEG3–p53 pathway remains to be analyzed in future studies.
- Evident from the text: the study relies on N2a cells and male C57BL/6 J mice, with no human tissue or clinical validation reported.
Model-written summary. Check it against the paper before relying on it.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
16 of 22 cited sources checked · 10 supported · 0 flagged · accuracy not yet measured
- Premisecitation
lncRNAs act as competing endogenous RNAs (ceRNAs) by competing for binding to miRNAs.
“increasing experimental evidence has confirmed that lncRNAs act as competing endogenous RNAs (ceRNAs) by competing for binding to miRNAs”
Quote in the paperSubstantial claim3 of 3 sources checked- cites [16] Cesana, M. et al. A long noncoding RNA controls muscle differentiation by functioning as a competing endogenous RNA. Cell 147, 358–369 (2011). source
- cites [17] Liu, X. et al. The mechanism of long non-coding RNA MEG3 for neurons apoptosis caused by hypoxia: mediated by miR-181b-12/15-LOX signaling pathway. Front. Cell. Neurosci. 10, 201 (2016). source
- cites [18] Tay, Y., Rinn, J. & Pandolfi, P. P. The multilayered complexity of ceRNA crosstalk and competition. Nature 505, 344–352 (2014). source
- Premisecitation
miR-21 protects spinal cords against ischemia-reperfusion injury by inhibiting PDCD4.
“Additionally, miRNA-21 protects spinal cords against ischemia-reperfusion injury by inhibition of PDCD438.”
Quote in the paperSubstantial claim1 of 1 sources checked- cites [38] He, F. et al. Overexpression of microRNA-21 protects spinal cords against transient ischemia. J. Thorac. Cardiovasc. Surg. 152, 1602–1608 (2016). source
- Premisecitation
LncRNAs can share common miRNA binding sites of mRNAs, thereby blocking the binding of target mRNAs to miRNAs and abolishing the downstream effects of those miRNAs.
“Moreover, lncRNAs could share common miRNA binding sites of mRNAs, thus blocking the binding of target mRNAs to miRNAs and abolishing the downstream effects of these miRNAs25.”
Quote in the paperSubstantial claim1 of 1 sources checked- cites [25] Salmena, L., Poliseno, L., Tay, Y., Kats, L. & Pandolfi, P. P. A ceRNA hypothesis: the Rosetta Stone of a hidden RNA language? Cell 146, 353–358 (2011). source
The ceRNA hypothesis sections describe non-coding RNAs competing with mRNAs for shared microRNA binding and give an example of an lncRNA sequestering a microRNA (page numbers unavailable). They describe impaired microRNA activity and diluted repression, not complete blocking of microRNA binding to target mRNAs or abolition of its downstream effects. (LLM, conf=0.88)
Experimental — accuracy not yet measured
- Premisecitation
In ischemia, miR-21 has been shown to be a strong anti-apoptosis and pro-survival factor that can downregulate the expression of apoptosis-related proteins.
“As for ischemia, miR-21 has been shown to be a strong anti-apoptosis and pro-survival factor, which could downregulate the expression of apoptosis related proteins32,33.”
Quote in the paperSubstantial claim1 of 2 sources checked- cites [32] Han, Z. et al. miR-21 alleviated apoptosis of cortical neurons through promoting PTEN-Akt signaling pathway in vitro after experimental traumatic brain injury. Brain Res. 1582, 12–20 (2014). source
- cites [33] Buller, B. et al. MicroRNA-21 protects neurons from ischemic death. FEBS J. 277, 4299–4307 (2010). source
- Premisecitation
The miR-21/PDCD4 pathway exerts anti-apoptotic effects against cell death in various diseases.
“Existing evidence revealed that miR-21/PDCD4 pathway exerts anti-apoptotic effects against cell death in various diseases36.”
Quote in the paperSubstantial claim1 of 1 sources checked- cites [36] Xiao, J. et al. Cardiac progenitor cell-derived exosomes prevent cardiomyocytes apoptosis through exosomal miR-21 by targeting PDCD4. Cell Death Dis. 7, e2277 (2016). source
The Results section reports that miR-21 reduced oxidative-stress-induced apoptosis in H9C2 cardiomyocytes by targeting PDCD4. The paper does not establish that this anti-apoptotic effect occurs across various diseases; its direct evidence is limited to the studied cardiac-cell model. Page numbers are not available in the supplied passages. (LLM, conf=0.86)
Experimental — accuracy not yet measured
- Findingown data
Overexpression of miR-21 protects against OGD/R-induced apoptotic cell death.
“In this study, we observed decreased expression of miR-21 following I/R or OGD/R, and overexpression of miR-21 protects OGD/R-induced apoptotic cell death, which was opposite to MEG3.”
Quote in the paperSubstantial claim - Findingown data
Knockdown of MEG3 reduces I/R-induced brain infarct volume in mice.
“si-MEG3 treatment significantly improved I/R-induced brain infract volume compared with si-s-MEG3”
- Also stated in: § Knockdown of MEG3 protects against ischemic damage and improves neurological deficits in vivo · hedged
“These results indicated that si-MEG3 were protective against I/R-induced ischemic damage in vivo.”
Quote in the paperSubstantial claim- Rests on an assumption: The MCAO mouse model is a valid model of human ischemic stroke.
- Also stated in: § Knockdown of MEG3 protects against ischemic damage and improves neurological deficits in vivo · hedged
- Findingown data
MEG3 is upregulated following ischemia in vitro and in vivo.
“In contrast to the consistently upregulation of MEG3 following ischemia”
- Also stated in: § miR-21 is downregulated following ischemia in vitro and in vivo · plain
“time-dependent upregulation of MEG3”
Quote in the paperSubstantial claim - Also stated in: § miR-21 is downregulated following ischemia in vitro and in vivo · plain
- Findingown data
miR-21 decreases PDCD4 mRNA and protein expression.
“miR-21 significantly decreased the expression of PDCD4 mRNA and protein”
Quote in the paperSubstantial claim - Findingown data
MEG3 is physically associated with miR-21 via three predicted binding sites.
“MEG3 is physically associated with microRNA-21 (miR-21)”
- Also stated in: § MEG3 is physically associated with miR-21 · hedged
“suggesting that MEG3 was physically associated with miR-21 via these sites”
- Also stated in: § MEG3 is physically associated with miR-21 · boosted
“It supported that miR-21 was bona fide MEG3-targeting miRNA.”
Quote in the paperSubstantial claim - Also stated in: § MEG3 is physically associated with miR-21 · hedged
- Findingown data
Overexpression of miR-21 protects against OGD/R-induced apoptotic neuronal death in vitro.
“overexpression of miR-21 protects oxygen–glucose deprivation and reoxygenation (OGD/R)-induced apoptotic cell death”
- Also stated in: § miR-21 protects OGD/R-induced neuronal death · boosted
“overexpression of miR-21 significantly abolished OGD/R-induced apoptotic cell death”
Quote in the paperSubstantial claim- Rests on an assumption: The N2a cell OGD/R model is a valid model of ischemic neuronal death in vivo.
- Also stated in: § miR-21 protects OGD/R-induced neuronal death · boosted
- Findingown data
OGD/R-induced apoptotic cell death gradually increases with reoxygenation time in N2a cells.
“TUNEL assay indicated that OGD/R-induced apoptotic cell death gradually increased with reoxygenation time”
Quote in the paperNot a substantial claim - Findingown data
MEG3 and miR-21 show the same expression trend in N2a cells as in MCAO mice at different time points of reoxygenation.
“OGD/R treatment caused the same expression trend of MEG3 and miR-21 in N2a cell as MCAO mice at different time points of reoxygenation”
Quote in the paperSubstantial claim - Findingown data
Knockdown of MEG3 reduces neuronal death in the cortex and striatum after I/R in mice.
“Much less neuronal death was detected in the vulnerable brain regions including the cortex and the striatum in mice injected with si-MEG3 compared with si-s-MEG3”
Quote in the paperSubstantial claim- Rests on an assumption: The MCAO mouse model is a valid model of human ischemic stroke.
- Findingown data
The first putative binding site between MEG3 and miR-21 is more important in determining the affinity of MEG3 to miR-21.
“which suggested that the first putative-binding sites between MEG3 and miR-21 in Fig. 1a were more important in determining the affinity of MEG3 to miR-21.”
Quote in the paperNot a substantial claim - Findingown data
In this study, miR-21 expression decreased following I/R or OGD/R.
“In this study, we observed decreased expression of miR-21 following I/R or OGD/R, and overexpression of miR-21 protects OGD/R-induced apoptotic cell death, which was opposite to MEG3.”
Quote in the paperSubstantial claim - Findingown data
miR-21 binds to the 3'-UTR of PDCD4 mRNA.
“Bioinformatics analysis using TargetScan indicated that miR-21 bounds to 3′-UTR of PDCD4 mRNA”
- Also stated in: § MEG3 competes with PDCD4 mRNA for binding to miR-21 · plain
“miR-21 mimic significantly decreased the luciferase activities of pmirGLO-PDCD4-WT reporter, but not of pmirGLO-PDCD4-MUT reporter”
Quote in the paperSubstantial claim - Also stated in: § MEG3 competes with PDCD4 mRNA for binding to miR-21 · plain
- Findingown data
miR-21 is downregulated following ischemia in the ischemic core in vitro and in vivo.
“miR-21 is downregulated following ischemia in the ischemic core in vitro and in vivo”
- Also stated in: § miR-21 is downregulated following ischemia in vitro and in vivo · plain
“Therefore, miR-21 is downregulated following ischemia in vitro and in vivo.”
Quote in the paperSubstantial claim - Also stated in: § miR-21 is downregulated following ischemia in vitro and in vivo · plain
- Findingown data
Knockdown of MEG3 (si-MEG3) improves spatial learning and memory in mice after MCAO, as indicated by reduced escape latency to the hidden platform and increased time spent in the target quadrant compared with si-s-MEG3-treated mice.
“the hidden platform (spatial learning ability) and increased time spent in the target quadrant (the second quadrant) when the platform was removed (spatial memory ability) compared to si-s-MEG3 treatment mice (Fig. 7d).”
- Also stated in: § Knockdown of MEG3 protects against ischemic damage and improves neurological deficits in vivo · plain
“Curve lines (left) show the escape latency to find the hidden platform. After 6 consecutive days of invisible training, the mice rest for 1 day, and at day 8, a probe test was conducted. Bar graph shows the time spent in the target quadrant (the second quadrant). Data represent means ± S.E.M. for 20 mice per group. * P < 0.05 by Student’s t-test.”
Quote in the paperSubstantial claim - Also stated in: § Knockdown of MEG3 protects against ischemic damage and improves neurological deficits in vivo · plain
- Findingown data
Focal ischemia induced by MCAO results in increased brain damage with reperfusion time.
“Focal ischemia induced by MCAO operation resulted in increased brain damage with reperfusion time following I/R”
Quote in the paperNot a substantial claim - Findingown data
Inhibition of endogenous miR-21 by miR-21 inhibitor increases OGD/R-induced neuronal death in vitro.
“more TUNEL-positive cells were observed when inhibition of endogenous miR-21 by miR-21 inhibitor”
Quote in the paperSubstantial claim- Rests on an assumption: The N2a cell OGD/R model is a valid model of ischemic neuronal death in vivo.
- Findingown data
In the present study, MEG3 shares common miRNA binding sites with PDCD4 mRNA.
“In present study, we found MEG3 share common miRNA binding sites of PDCD4 mRNA.”
Quote in the paperSubstantial claim - Findingown data
si-MEG3 protects against I/R-induced damage in vivo.
“Following the ischemic injury and subsequent reperfusion, we found si-MEG3 has the capability to protect against I/R-induced damage in vivo and shown that si-MEG3 significantly improved I/R-induced brain infract volume and profoundly reduced neuronal death.”
Quote in the paperSubstantial claim - Findingown data
si-MEG3 profoundly reduced neuronal death.
“Following the ischemic injury and subsequent reperfusion, we found si-MEG3 has the capability to protect against I/R-induced damage in vivo and shown that si-MEG3 significantly improved I/R-induced brain infract volume and profoundly reduced neuronal death.”
Quote in the paperSubstantial claim - Findingown data
Injection of si-MEG3 or si-s-MEG3 did not alter motion function and locomotor activity in mice.
“Fortunately, it has been found that motion function and locomotor activity were not altered in mice treated with si-MEG3 or si-s-MEG3.”
- Also stated in: § Knockdown of MEG3 protects against ischemic damage and improves neurological deficits in vivo · plain
“The motion function and locomotor activity of the normal mice and mice treated with si-MEG3 or si-s-MEG3 was assessed by open-field test before MCAO operation. Quantifications of average velocity (left), time spent in the side areas (middle) and in the center square (right) were made for 10 min during each session. Data are means ± S.E.M. for 12 mice per group. P > 0.05 by Student’s t-test for all”
Quote in the paperSubstantial claim - Also stated in: § Knockdown of MEG3 protects against ischemic damage and improves neurological deficits in vivo · plain
- Findingown data
si-MEG3 significantly improved I/R-induced brain infarct volume.
“Following the ischemic injury and subsequent reperfusion, we found si-MEG3 has the capability to protect against I/R-induced damage in vivo and shown that si-MEG3 significantly improved I/R-induced brain infract volume and profoundly reduced neuronal death.”
Quote in the paperSubstantial claim - Interpretationown data
lncRNA MEG3 functions as a ceRNA for miR-21 to regulate PDCD4 expression in ischemic neuronal death followed by reperfusion.
“These findings indicate that lncRNA MEG3 functions as a ceRNA for miR-21 to regulate PDCD4 expression in ischemic neuronal death followed by reperfusion”
- Also stated in: § Abstract · boosted
“Thus, our data uncovers a novel mechanism of lncRNA MEG3 as a ceRNA by targeting miR-21/PDCD4 signaling pathway in regulating ischemic neuronal death”
Quote in the paperSubstantial claim- Rests on an assumption: PDCD4 is the downstream effector through which miR-21 and MEG3 regulate ischemic neuronal death.
- Rests on an assumption: The N2a cell OGD/R model is a valid model of ischemic neuronal death in vivo.
- Rests on an assumption: The MCAO mouse model is a valid model of human ischemic stroke.
- Also stated in: § Abstract · boosted
- Interpretationown data
MEG3 competes with PDCD4 mRNA for binding to miR-21.
“Thus, all these data indicated that MEG3 competes with PDCD4 mRNA for binding to miR-21.”
- Also stated in: § Abstract · plain
“MEG3 functions as a competing endogenous RNAs (ceRNAs) and competes with programmed cell death 4 (PDCD4) mRNA for directly binding to miR-21”
Quote in the paperSubstantial claim - Also stated in: § Abstract · plain
- Interpretationown data
MEG3 and miR-21 show an expressional and functional negative correlation in response to ischemia.
“These results suggested the expressional and functional negative correlation between MEG3 and miR-21 in response to ischemia.”
Quote in the paperSubstantial claim - Premisenone given
PDCD4 is one of the known targets of miR-21.
“PDCD4 is one of the known targets of miR-21.”
Quote in the paperNot a substantial claim - Premisecitation
MEG3 functions as a cell death promoter in ischemia.
“Our previous study has revealed that lncRNA MEG3 functioned as a cell death promoter in ischemia24.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [24] Yan, H., Yuan, J., Gao, L., Rao, J. & Hu, J. Long noncoding RNA MEG3 activation of p53 mediates ischemic neuronal death in stroke. Neuroscience 337, 191–199 (2016). source
- Premisecitation
Ischemia alters cerebral MEG3 profiles in vitro and in vivo.
“Our previous study observed that ischemia altered cerebral MEG3 profiles in vitro and in vivo 24.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [24] Yan, H., Yuan, J., Gao, L., Rao, J. & Hu, J. Long noncoding RNA MEG3 activation of p53 mediates ischemic neuronal death in stroke. Neuroscience 337, 191–199 (2016). source
- Premisecitation
MEG3 interacts with p53 and activates p53-mediated transactivation to mediate ischemic neuronal death in stroke.
“Furthermore, MEG3 interacted with p53 and activated p53-mediated transactivation to mediate ischemic neuronal death in stroke24.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [24] Yan, H., Yuan, J., Gao, L., Rao, J. & Hu, J. Long noncoding RNA MEG3 activation of p53 mediates ischemic neuronal death in stroke. Neuroscience 337, 191–199 (2016). source
- Interpretationown data
MEG3 regulates ischemic neuronal death by contradicting the inhibitory effects of miR-21 on PDCD4.
“These series of results indicated that MEG3 regulates ischemic neuronal death by contradicting the inhibitory effects of miR-21 on PDCD4.”
- Also stated in: § Abstract · plain
“MEG3 functions as a competing endogenous RNAs (ceRNAs) and competes with programmed cell death 4 (PDCD4) mRNA for directly binding to miR-21, which mediates ischemic neuronal death.”
Quote in the paperSubstantial claim- Rests on an assumption: PDCD4 is the downstream effector through which miR-21 and MEG3 regulate ischemic neuronal death.
- Also stated in: § Abstract · plain
- Interpretationown data
Knockdown of MEG3 improves overall neurological functions in vivo.
“Taken together, knockdown of MEG3 improves overall neurological functions in vivo.”
Quote in the paperSubstantial claim - Interpretationown data
The data point to the potential of the MEG3-miR-21-PDCD4 interaction in the treatment of cerebral ischemia.
“Accordingly, above data seems to point to the potential of MEG3–miR-21–PDCD4 interaction in the treatment of cerebral ischemia.”
Quote in the paperSubstantial claim - Interpretationown data
This is the first report to determine the interaction of MEG3-miR-21-PDCD4 in ischemic stroke.
“So, it is the first report to determine the interaction of MEG3–miR-21–PDCD4 in ischemic stroke.”
Quote in the paperSubstantial claim - Interpretationown data
This is the first report on a novel mechanism of lncRNA MEG3 as a ceRNA by targeting the miR-21/PDCD4 signaling pathway to regulate ischemic neuronal death.
“In conclusion, we represents the first report on a novel mechanism of lncRNA MEG3 as a ceRNA by targeting miR-21/PDCD4 signaling pathway to regulate ischemic neuronal death.”
Quote in the paperSubstantial claim
- Classified as probably not a substantial claim. 9
- May combine two claims. 14
Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationMEG3 is an imprinted gene located on chromosome 14q32.3 in humans and functions as a lncRNA.
“Maternally expressed gene 3 (MEG3), also known as gene trap locus 2 (Gtl2), is an imprinted gene located on chromosome 14q32.3 in humans and functions as a lncRNA19.”
Quote in the paperNot a substantial claim1 of 1 sources checked- cites [19] Zhang, X. et al. Maternally expressed gene 3 (MEG3) noncoding ribonucleic acid: isoform structure, expression, and functions. Endocrinology 151, 939–947 (2010). source
The Abstract identifies human MEG3 as an imprinted gene that encodes a noncoding RNA, supporting its description as a lncRNA. Our copy does not state that MEG3 is located at human chromosome 14q32.3; a reference title mentions a 14q32.2 imprinted region but does not establish the claimed location. (LLM, conf=0.86)
Experimental — accuracy not yet measured
Classified as probably not a substantial claim.
PremisecitationmiRNAs are critical mediators of ischemia.
“Among these RNAs, miRNAs are the most studied of all ncRNAs as critical mediator of ischemia4,5.”
Quote in the paperSubstantial claim2 of 2 sources checkedClassified as probably not a substantial claim.
PremisecitationmiR-21 protects cardiomyocytes against H2O2-induced apoptosis by targeting PDCD4.
“For example, miR-21 protects cardiomyocytes against H2O2 induced cell apoptosis by targeting the proapoptotic proteins PDCD437.”
Quote in the paperSubstantial claim1 of 1 sources checked- cites [37] Cheng, Y. et al. MicroRNA-21 protects against the H(2)O(2)-induced injury on cardiac myocytes via its target gene PDCD4. J. Mol. Cell. Cardiol. 47, 5–14 (2009). source
Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationmiR-21 is widely expressed in mammalian cells, is located on chromosome 17q23.2 in humans, and its upregulation is associated with various types of solid tumors.
“miR-21 is a widespread expression of miRNA in mammalian cells located on chromosome 17q23.2 in humans, whose upregulation is associated with various types of solid tumors29–31.”
Quote in the paperNot a substantial claim2 of 3 sources checked- cites [29] Baez-Vega, P. M. et al. Targeting miR-21-3p inhibits proliferation and invasion of ovarian cancer cells. Oncotarget 7, 36321–36337 (2016). source
The Introduction (page unavailable) says miR-21-5p is overexpressed in most cancers, supporting the tumor-association part of the claim. It does not establish that miR-21 is widely expressed in mammalian cells or locate the human gene at chromosome 17q23.2; searches for those details found no supporting passage. (LLM, conf=0.88)
Experimental — accuracy not yet measured - cites [30] Moore, L. M. & Zhang, W. Targeting miR-21 in glioma: a small RNA with big potential. Expert Opin. Ther. Targets 14, 1247–1257 (2010). source
- cites [31] Krichevsky, A. M. & Gabriely, G. miR-21: a small multi-faceted RNA. J. Cell. Mol. Med. 13, 39–53 (2009). source
The section on mechanisms of miR-21 elevation maps the human gene to chromosome 17q23.2, and the section on expression in cancer reports upregulation across several types of solid tumour. The paper says miR-21 is conserved in mammals, but the passages do not establish that it is widely expressed in mammalian cells; conservation is not the same as widespread expression. (LLM, conf=0.83)
Experimental — accuracy not yet measured
Classified as probably not a substantial claim.
PremisecitationceRNAs, such as lncRNAs, compete for binding to miRNAs through miRNA response elements (MREs), preventing miRNA binding to target mRNAs.
“ceRNAs, such as lncRNAs, could compete for binding to miRNAs through miRNA response elements (MREs), thus preventing the binding of miRNAs to target mRNAs25.”
Quote in the paperSubstantial claim1 of 1 sources checked- cites [25] Salmena, L., Poliseno, L., Tay, Y., Kats, L. & Pandolfi, P. P. A ceRNA hypothesis: the Rosetta Stone of a hidden RNA language? Cell 146, 353–358 (2011). source
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationMEG3 serves as a ceRNA for miR-21 to regulate cell proliferation or apoptosis in some tumors.
“More significantly, studies have revealed that MEG3 serves as a ceRNA for miR-21 to regulate cell proliferation or apoptosisin in some tumors34,35, but whether MEG3 competes with mRNA for miR-21 in ischemia and contributes to ischemic neuronal death remained unexplored.”
Quote in the paperNot a substantial claim2 of 2 sources checked- cites [34] Zhang, J. et al. Long noncoding RNA MEG3 is downregulated in cervical cancer and affects cell proliferation and apoptosis by regulating miR-21. Cancer Biol. Ther. 17, 104–113 (2016). source
The Results and Discussion (page not provided) report that MEG3 regulates miR-21-5p and affects proliferation and apoptosis in cervical cancer cells. They do not establish that MEG3 acts as a competing endogenous RNA (ceRNA) for miR-21; the Discussion says the exact mechanism of their interaction requires further study. (LLM, conf=0.88)
Experimental — accuracy not yet measured - cites [35] Zhou, X., Yuan, P., Liu, Q. & Liu, Z. LncRNA MEG3 regulates imatinib resistance in chronic myeloid leukemia via suppressing MicroRNA-21. Biomol. Therap. 25, 490–496 (2017). source
May combine two claims.
Findingown dataMEG3 overexpression abolishes the protective effect of miR-21 on OGD/R-induced neuronal death, while si-MEG3 augments it.
“the protection effect of miR-21 on OGD/R-induced neuronal death were abolished by MEG3 overexpression, and augmented by si-MEG3”
- Also stated in: § MEG3 contradicts the inhibitory effects of miR-21 on PDCD4 to regulate ischemic neuronal death · plain
“more TUNEL-positive cells when cotransfection of miR-21 mimic + MEG3-expressing plasmid, while less TUNEL-positive cells when cotransfection of miR-21 mimic + si-MEG3”
Quote in the paperSubstantial claim- Rests on an assumption: The N2a cell OGD/R model is a valid model of ischemic neuronal death in vivo.
- Also stated in: § MEG3 contradicts the inhibitory effects of miR-21 on PDCD4 to regulate ischemic neuronal death · plain
May combine two claims.
Findingown dataIn the open-field test 3 days after MCAO, mice treated with si-MEG3 showed higher average velocity and spent more time in the center area of the apparatus than mice treated with si-s-MEG3.
“In this assessment, mice treated with si-MEG3 showed a higher velocity and spent more time in the center area of the apparatus than mice treated with si-s-MEG3, indicating an improved locomotor activity and anxiety-like behavior (Fig. 7e).”
- Also stated in: § Knockdown of MEG3 protects against ischemic damage and improves neurological deficits in vivo · plain
“Open-field test. The performance on open-field test of three groups (sham-treated mice, si-s-MEG3 and si-MEG3 injection mice subjected to MCAO operation) was analyzed 3 days after MCAO operation. Data represent means ± S.E.M. for 12 mice per group. * P < 0.05 by Student’s t-test”
Quote in the paperSubstantial claim- Also stated in: § Knockdown of MEG3 protects against ischemic damage and improves neurological deficits in vivo · plain
May combine two claims.
Findingown dataBioinformatics analysis identified that MEG3 targets miR-21 and might play an important role in ischemic neuronal death.
“With bioinformatics, we identified that the cell death promoter MEG3 target miR-21 and hence might play an important role in ischemic neuronal death.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataKnockdown of MEG3 improves neurological function, motor coordination, and spatial learning/memory after MCAO in mice.
“better neurological score in si-MEG3 injection mice compared with si-s-MEG3”
- Also stated in: § Knockdown of MEG3 protects against ischemic damage and improves neurological deficits in vivo · plain
“si-MEG3 injection resulted in better recovery of motor coordination in rotarod test”
- Also stated in: § Knockdown of MEG3 protects against ischemic damage and improves neurological deficits in vivo · plain
“Long-term learning and memory deficits were significantly improved in si-MEG3 treatment mice after MCAO”
Quote in the paperSubstantial claim- Rests on an assumption: The MCAO mouse model is a valid model of human ischemic stroke.
- Also stated in: § Knockdown of MEG3 protects against ischemic damage and improves neurological deficits in vivo · plain
May combine two claims.
Findingown dataThe authors' results supported that the miR-21/PDCD4 pathway exerts anti-apoptotic effects, and further confirmed that the miR-21/PDCD4 pathway is regulated by MEG3.
“Our results also supported this fact, moreover, we further confirmed that miR-21/PDCD4 pathway were regulated by MEG3.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataMEG3 overexpression abolishes the inhibitory effect of miR-21 on PDCD4 expression, while si-MEG3 augments it.
“the effects of miR-21 on PDCD4 were abolished by MEG3 overexpression, and augmented by si-MEG3”
- Also stated in: § MEG3 competes with PDCD4 mRNA for binding to miR-21 · hedged
“the suppressive effects of miR-21 on the luciferase activity of pmirGLO-PDCD4-WT could be abolished by overexpression of MEG3, while augmented by si-MEG3”
Quote in the paperSubstantial claim- Also stated in: § MEG3 competes with PDCD4 mRNA for binding to miR-21 · hedged
May combine two claims.
Findingown datasi-MEG3 treatment markedly improved long-term learning and memory deficits, locomotor activity and anxiety-like behavior post-ischemia.
“And what’s more, si-MEG3 treatment markedly improved long-term learning and memory deficits, locomotor activity and anxiety-like behavior post-ischemia.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown datasi-MEG3 injection revealed a better neurological score and recovery of motor coordination in mice after I/R.
“On the other hand, si-MEG3 injection revealed a better neurological score and recovery of motor coordination in mice after I/R.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataIn the present study, MEG3 affects PDCD4 expression through downregulation of miR-21 and counteracts the inhibitory effect of miR-21 on PDCD4, abolishing miR-21's protection in ischemic neuronal death.
“In the present study, MEG3 affects PDCD4 expression through downregulation of the miR-21 level and contradicts the inhibitory effects of miR-21 on PDCD4 to abolish the protection effect of miR-21 in ischemic neuronal death.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataKnockdown of MEG3 improves locomotor activity and anxiety-like behavior in mice after MCAO.
“indicating an improved locomotor activity and anxiety-like behavior (Fig. 7e).”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationIn the authors' previous study, they determined the expression and function of lncRNA MEG3 in cerebral ischemia.
“In our previous study, we first determined the expression and function of lncRNA MEG3 in cerebral ischemia24.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [24] Yan, H., Yuan, J., Gao, L., Rao, J. & Hu, J. Long noncoding RNA MEG3 activation of p53 mediates ischemic neuronal death in stroke. Neuroscience 337, 191–199 (2016). source
Probably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductreasoningThe study did not exclude the possibility that other targets of MEG3 or miR-21 may also contribute to ischemic neuronal death.
“Although here we described that MEG3 competed with PDCD4 mRNA for binding to miR-21 in ischemia, we didn’t exclude the possibility of other targets of MEG3 or miR-21 which may also contribute to the ischemic neuronal death.”
Quote in the paperNot a substantial claim- Rests on an assumption: PDCD4 is not the only target of miR-21, and miR-21 is not the only target of MEG3.
Probably not a substantial claim: may not pass S3 (load-bearing).
Premiseown dataThe authors previously confirmed that MEG3 activated p53-mediated transactivation to mediate neuronal death in cerebral ischemia.
“Besides, we previously confirmed that MEG3 activated p53-mediated transactivation to mediate neuronal death in cerebral ischemia.”
Quote in the paperNot a substantial claimMay combine two claims.
Interpretationown dataKnockdown of MEG3 protects against ischemic damage and neurological deficits.
“Thus, knockdown of MEG3 protects against ischemic damage and neurological deficits.”
Quote in the paperSubstantial claimMay combine two claims.
InterpretationreasoningKnockdown of MEG3 enhances the protection effects of the miR-21/PDCD4 pathway and prevents subsequent ischemic brain injury.
“Knockdown of MEG3 enhanced the protection effects of miR-21/PDCD4 pathway and prevents the followed ischemic brain injury.”
Quote in the paperSubstantial claim
The paper relies on this without support.
PDCD4 is the downstream effector through which miR-21 and MEG3 regulate ischemic neuronal death.
“These series of results indicated that MEG3 regulates ischemic neuronal death by contradicting the inhibitory effects of miR-21 on PDCD4.”
The paper relies on this without support.
The N2a cell OGD/R model is a valid model of ischemic neuronal death in vivo.
“Then, N2a cell oxygen–glucose deprivation and reoxygenation (OGD/R) model was established to further determine the expression of miR-21 in response to ischemia in vitro”
The paper relies on this without support.
The MCAO mouse model is a valid model of human ischemic stroke.
“focal cerebral ischemia was induced in adult male mice by middle cerebral artery occlusion (MCAO) for 60 min”
The paper relies on this without support.
MEG3 has not been functionally characterized in ischemia, so the mechanisms underlying its effects in ischemia need deeper exploration.
“However, although the relationship of MEG3 expression with a variety of tumors has been confirmed20–23, MEG3 have not been functionally characterized in ischemia, thus, the mechanisms underlying the effects of MEG3 in ischemia still needs to be explored deeply.”
The paper relies on this without support.
PDCD4 is not the only target of miR-21, and miR-21 is not the only target of MEG3.
“Since PDCD4 is not the only target of miR-21, similarly, miR-21 is not the only target of MEG3, some other targets of MEG3/miR-21 should be further analysed in the further experiments.”
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
MEG3 is described as both previously characterized and uncharacterized in ischemia
MinorThe discussion says the authors previously determined MEG3's function in cerebral ischemia, then says it had not been functionally characterized in ischemia.
“In our previous study, we first determined the expression and function of lncRNA MEG3 in cerebral ischemia24.”
“MEG3 have not been functionally characterized in ischemia”
Mutant MEG3 is reported to enrich miR-21 despite losing its miR-21 reporter response
MinorThe luciferase assay reports no response to increasing miR-21 after all three predicted binding sites are mutated. The pulldown result instead reports miR-21 enrichment for MEG3 bearing mutations in those same three sites, conflicting with the paper's interpretation that these sites account for the observed association.
“MS2-containing MEG3 with mutations in all three miR-21-targeting sites (MEG3-MUT-MS2) was significantly enriched for miR-21 compared to the empty vector (MS2) (Fig. 1c).”
“However, the luciferase reporter activities of the pmirGLO-MEG3-MUT reporter did not change with the increase of miR-21 (Fig. 1b, left).”
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Flagged first, then by citations
Cited by
Still being checked.
- Authors
- Yan, H., Rao, J., Yuan, J., Gao, L., Huang, W., Zhao, L., & Ren, J.
- Affiliations
- Renmin Hospital of Wuhan University (CN)
- Corresponding author
- Yuan, Jingping
- Venue
- Cell Death & Disease
- Published
- 2017-12-13
- Volume
- 8
- Issue
- 12
- Pages
- 3211-3211
- ISSN
- 2041-4889 (ISSN-L)
- PMC
- PMC5870589
- OpenAlex
- W2774335059
- Semantic Scholar
- 1d0de784b8f56e5e7612c00346d903c2912ff552
- Cited by
- 190
- References
- 38
- Citations by year
- 2026: 6 · 2025: 11 · 2024: 6 · 2023: 13 · 2022: 26 · 2021: 41 · 2020: 32 · 2019: 31 · 2018: 22
- FWCI
- 6.96
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Cell Death and Disease (publishedVersion, cc-by)
- PubMed (publishedVersion)
- PubMed Central (submittedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- National Natural Science Foundation of China (31600866)
- Wuhan University
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer-related molecular mechanisms research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Keywords
- MEG3, long non-coding RNA, competing endogenous RNA, miR-21, PDCD4, ischemic stroke, cerebral ischemia, neuronal apoptosis, oxygen-glucose deprivation/reoxygenation, microRNA sponge, neurological function
- MeSH terms
- Animals, Base Sequence, Binding, Competitive, Cell Line, Brain Ischemia, Disease Models, Animal, Gene Expression Regulation, Glucose, Humans, Male, Mice, Inbred C57BL, Neurons, RNA, Messenger, Signal Transduction, Cell Hypoxia, RNA-Binding Proteins, Apoptosis, Maze Learning, Base Pairing, Stroke, MicroRNAs, Apoptosis Regulatory Proteins, Mice, RNA, Long Noncoding
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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
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