Cited by 143Cancer, Hypoxia, and MetabolismErythropoietin and Anemia TreatmentAngiogenesis and VEGF in Cancer

The DOI matches its Crossref record; 57 of the 58 references it cites were found in a registry or an index, and 1 are not checked yet.

The transition from HIF-1 to HIF-2 during prolonged hypoxia results from reactivation of PHDs and HIF1A mRNA instability

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Abstract

The hypoxia-inducible factors (HIF) are transcription factors that activate the adaptive hypoxic response when oxygen levels are low. The HIF transcriptional program increases oxygen delivery by inducing angiogenesis and by promoting metabolic reprograming that favors glycolysis. The two major HIFs, HIF-1 and HIF-2, mediate this response during prolonged hypoxia in an overlapping and sequential fashion that is referred to as the HIF switch. Both HIF proteins consist of an unstable alpha chain and a stable beta chain. The instability of the alpha chains is mediated by prolyl hydroxylase (PHD) activity during normoxic conditions, which leads to ubiquitination and proteasomal degradation of the alpha chains. During normoxic conditions, very little HIF-1 or HIF-2 alpha–beta dimers are present because of PHD activity. During hypoxia, however, PHD activity is suppressed, and HIF dimers are stable. Here we demonstrate that HIF-1 expression is maximal after 4 h of hypoxia in primary endothelial cells and then is dramatically reduced by 8 h. In contrast, HIF-2 is maximal at 8 h and remains elevated up to 24 h. There are differences in the HIF-1 and HIF-2 transcriptional profiles, and therefore understanding how the transition between them occurs is important and not clearly understood. Here we demonstrate that the HIF-1 to HIF-2 transition during prolonged hypoxia is mediated by two mechanisms: (1) the HIF-1 driven increase in the glycolytic pathways that reactivates PHD activity and (2) the much less stable mRNA levels of HIF-1α ( HIF1A ) compared to HIF-2α ( EPAS1 ) mRNA. We also demonstrate that the alpha mRNA levels directly correlate to the relative alpha protein levels, and therefore to the more stable HIF-2 expression during prolonged hypoxia.

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Crossref · 10.1186/s11658-022-00408-7

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  • Sustained intracellular oxygen redistribution favors prolonged stabilization of HIF-2α.

    “sustained intracellular oxygen redistribution has been reported to favor prolonged stabilization of HIF-2α [275]”

    From HIF inhibition: Current strategies and clinical challenges (2026) · cites this paper as [275]

    The Discussion says that cellular oxygen redistribution during prolonged hypoxia reactivates PHDs, decreasing both HIF-1α and HIF-2α proteins. It also reports that preventing this reactivation led to higher HIF-2α accumulation at 24 hours. Thus, the paper does not say redistribution favors prolonged HIF-2α stabilization; it reports the opposite effect. (LLM, conf=0.89)

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  • Limitation of mitochondrial respiratory activity in hypoxic cells promotes intracellular oxygen redistribution from mitochondria to the cytosol, thereby restoring prolyl hydroxylase activity and accelerating HIF-1α degradation.

    “limitation of mitochondrial respiratory activity in hypoxic cells has been established to promote intracellular oxygen redistribution from mitochondria to the cytosol, thereby restoring prolyl hydroxylase activity and accelerating HIF-1α degradation [275,[366], [367], [368]].”

    From HIF inhibition: Current strategies and clinical challenges (2026) · cites this paper as [275]

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Research works printed but not linked: 1

  1. Smirnova NA, Osipyants AI, Khristichenko AY, Hushpulian DM, Nikulin SV, Chubar TA, et al. HIF2 ODD-luciferase reporter: the most sensitive assay for HIF prolyl hydroxylase inhibitors. Russ Chem Bull. 2018;67(1):150–6. · DOI

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Metadata

Authors
Jaśkiewicz, M., Moszyńska, A., Króliczewski, J., Cabaj, A., Bartoszewska, S., Charzyńska, A., Gebert, M., Dąbrowski, M., Collawn, J. F., & Bartoszewski, R.
Affiliations
  • Gdańsk Medical University (PL)
  • Instytut Biologii Doświadczalnej im. Marcelego Nenckiego (PL)
  • University of Alabama at Birmingham (US)
Venue
Cellular & Molecular Biology Letters
Published
2022-12
Volume
27
Issue
1
Pages
109-109
ISSN
  • 1425-8153 (ISSN-L)
  • 1689-1392
OpenAlex
W4311079783
Cited by
143
References
58
Citations by year
2026: 37 · 2025: 46 · 2024: 39 · 2023: 20 · 2022: 1
FWCI
11.17
Type
journal article
Language
en
Open access
Locations
  • Cellular & Molecular Biology Letters (publishedVersion, cc-by)
  • Research Square (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Narodowe Centrum Nauki (2015/18/E/NZ3/00687)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
  • Health Sciences › Medicine › Hematology › Erythropoietin and Anemia Treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Angiogenesis and VEGF in Cancer
Keywords
hypoxia-inducible factor, HIF-1, HIF-2, prolyl hydroxylase, EPAS1, HIF-1α, HIF-2α, glycolysis, endothelial cells, hypoxia response, transcriptional regulation, mRNA stability
MeSH terms
Endothelial PAS Domain-Containing Protein 1, Humans, Oxygen, RNA, Messenger, Cell Hypoxia, RNA Stability, Endothelial Cells, Basic Helix-Loop-Helix Proteins, Basic Helix-Loop-Helix Transcription Factors, Hypoxia-Inducible Factor 1, alpha Subunit

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