Cited by 23Pulmonary Hypertension Research and TreatmentsCancer-related Molecular PathwaysVascular Anomalies and Treatments

CDC2 Is an Important Driver of Vascular Smooth Muscle Cell Proliferation via FOXM1 and PLK1 in Pulmonary Arterial Hypertension

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Pal-Ghosh, Ruma, Xue, Danfeng, Warburton, Rod, Hill, Nicholas, Polgar, Peter, Wilson, Jamie L.·2021·International Journal of Molecular Sciences

Published version of a preprint

Abstract

A key feature of pulmonary arterial hypertension (PAH) is the hyperplastic proliferation exhibited by the vascular smooth muscle cells from patients (HPASMC). The growth inducers FOXM1 and PLK1 are highly upregulated in these cells. The mechanism by which these two proteins direct aberrant growth in these cells is not clear. Herein, we identify cyclin-dependent kinase 1 (CDK1), also termed cell division cycle protein 2 (CDC2), as having a primary role in promoting progress of the cell cycle leading to proliferation in HPASMC. HPASMC obtained from PAH patients and pulmonary arteries from Sugen/hypoxia rats were investigated for their expression of CDC2. Protein levels of CDC2 were much higher in PAH than in cells from normal donors. Knocking down FOXM1 or PLK1 protein expression with siRNA or pharmacological inhibitors lowered the cellular expression of CDC2 considerably. However, knockdown of CDC2 with siRNA or inhibiting its activity with RO-3306 did not reduce the protein expression of FOXM1 or PLK1. Expression of CDC2 and FOXM1 reached its maximum at G1/S, while PLK1 reached its maximum at G2/M phase of the cell cycle. The expression of other CDKs such as CDK2, CDK4, CDK6, CDK7, and CDK9 did not change in PAH HPASMC. Moreover, inhibition via Wee1 inhibitor adavosertib or siRNAs targeting Wee1, Myt1, CDC25A, CDC25B, or CDC25C led to dramatic decreases in CDC2 protein expression. Lastly, we found CDC2 expression at the RNA and protein level to be upregulated in pulmonary arteries during disease progression Sugen/hypoxia rats. In sum, our present results illustrate that the increased expression of FOXM1 and PLK1 in PAH leads directly to increased expression of CDC2 resulting in potentiated growth hyperactivity of PASMC from patients with pulmonary hypertension. Our results further suggest that the regulation of CDC2, or associated regulatory proteins, will prove beneficial in the treatment of this disease.

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Crossref · 10.3390/ijms22136943

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  • This evidence supports multilevel regulation of the CDK1/cyclin B1 axis by MGF.

    “This evidence supports multilevel regulation of the CDK1/cyclin B1 axis by MGF.”

    From Mangiferin in human disease: Multifaceted mechanisms and applications (Review) (2026) · cites this paper as [57]

    The Introduction (page unavailable) describes several mechanisms regulating the CDC2/CDK1–cyclin B complex, including phosphorylation and activation by CDC25. The Discussion (page unavailable) also describes multiple CDC2 regulators. Our copy does not mention MGF or show that MGF regulates this axis, so the MGF-specific conclusion is unsupported. (LLM, conf=0.80)

    Experimental — accuracy not yet measured
  • MGF decreases CDK1/cyclin B1 activity, alters CDK1 phosphorylation, and engages ATR-dependent Chk1 activation in other tumor cell lines.

    “This outcome is consistent with reports of decreased CDK1/cyclin B1 activity, altered phosphorylation of CDK1 with reduced activating phosphorylation and increased inhibitory phosphorylation, and engagement of checkpoint signaling, including ATR-dependent Chk1 activation, in other tumor cell lines exposed to MGF (56,57).”

    From Mangiferin in human disease: Multifaceted mechanisms and applications (Review) (2026) · cites this paper as [57]

    The Introduction describes activating and inhibitory phosphorylation of CDC2/cyclin B, but not changes caused by MGF. The paper’s Results concern pulmonary artery smooth muscle cells; searches for MGF, mangiferin, and ATR-dependent Chk1 activation found no passage addressing the claimed effects in tumor cell lines. No page numbers are available in our copy. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • Across tumor cell systems, the functional consequence of MGF exposure remains G2/M arrest, with reduced proliferation and increased susceptibility to apoptosis.

    “However, across tumor cell systems, the functional consequence remains G2/M arrest, with reduced proliferation and increased susceptibility to apoptosis.”

    From Mangiferin in human disease: Multifaceted mechanisms and applications (Review) (2026) · cites this paper as [57]

    The Discussion describes G2/M arrest with the CDC2 inhibitor RO-3306, not with MGF. The paper studies pulmonary-artery smooth muscle cells; searches for MGF and mangiferin found no passage addressing their effects on tumor-cell proliferation or apoptosis. The claimed outcome of MGF exposure therefore cannot be verified from this copy. (LLM, conf=0.78)

    Experimental — accuracy not yet measured

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Authors
Pal-Ghosh, R., Xue, D., Warburton, R., Hill, N., Polgar, P., & Wilson, J. L.
Affiliations
  • Tupper Research Institute and Pulmonary, Critical Care, and Sleep Division, Tufts Medical Center, Boston, MA 02111, USA
  • Tufts Medical Center (US)
Corresponding author
Wilson, Jamie L.
Venue
International Journal of Molecular Sciences
Publisher
MDPI AG
Published
2021-06-28
Volume
22
Issue
13
Pages
6943
ISSN
1422-0067 (ISSN-L)
OpenAlex
W3173683284
Cited by
22
References
91
Citations by year
2026: 2 · 2025: 4 · 2024: 3 · 2023: 1 · 2022: 12
FWCI
2.76
Type
journal article
Language
en
Open access
Locations
  • International Journal of Molecular Sciences (publishedVersion, cc-by)
  • Preprints.org (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Heart, Lung, and Blood Institute (HL133796)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Pulmonary Hypertension Research and Treatments
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Health Sciences › Medicine › Genetics › Vascular Anomalies and Treatments
Keywords
pulmonary arterial hypertension, vascular smooth muscle cell proliferation, cdc2, cyclin-dependent kinase 1, FOXM1, PLK1, cell cycle regulation, WEE1, Sugen/hypoxia rat model, cyclin-dependent kinase inhibitors, adavosertib, Cdc25 phosphatase
MeSH terms
Forkhead Box Protein M1, Pulmonary Arterial Hypertension, Polo-Like Kinase 1, Animals, Cell Cycle, Humans, Male, Muscle, Smooth, Vascular, Proto-Oncogene Proteins, CDC2 Protein Kinase, Rats, Sprague-Dawley, Protein Serine-Threonine Kinases, Cell Cycle Proteins, Cell Proliferation, Rats, Vascular Remodeling

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