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Examining the Dynamics of Cellular Adhesion and Spreading of Epithelial Cells on Fibronectin During Oxidative Stress
Published on: October 13, 2019
Uncoupling oxidative phosphorylation with 2,4-dinitrophenol promotes development of the adhesion phenotype
Valerie I Shavell1, Nicole M Fletcher, Zhong L Jiang
1Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, The CS Mott Center for Human Growth and Development, Wayne State University School of Medicine, Detroit, Michigan 48201, USA. vshavell@med.wayne.edu
Objective:
To determine the effect of uncoupling oxidative phosphorylation with 2,4-dinitrophenol (DNP) on adhesion phenotype development.
Design:
Prospective experimental study.
Setting:
Academic medical center.
Patient(S):
Women undergoing laparotomy for pelvic pain from whom normal peritoneum and adhesions were excised to create primary cultures of normal peritoneal and adhesion fibroblasts.
Intervention(S):
Treatment of normal peritoneal and adhesion fibroblasts isolated from the same patient(s) with or without 0.2 mM DNP for 24 hours.
Main Outcome Measure(S):
Evaluation of adhesion phenotype markers type I collagen, vascular endothelial growth factor (VEGF), and hypoxia-inducible factor (HIF)-1α.
Result(S):
In agreement with prior findings, adhesion fibroblasts exhibited significantly higher basal levels of type I collagen, VEGF, and HIF-1α compared with normal peritoneal fibroblasts. Treatment of normal peritoneal fibroblasts with DNP resulted in significant increases in type I collagen (10.2 ± 1.4 vs. 18.4 ± 1.9 fg/μg RNA) and VEGF (8.2 ± 1.1 vs. 13.7 ± 0.4 fg/μg RNA) over baseline. HIF-1α levels did not increase when normal peritoneal fibroblasts were treated with DNP.
Conclusion(S):
The adhesion phenotype, which is normally expressed in response to hypoxia, is reproduced in a normoxic environment by uncoupling oxidative phosphorylation with DNP, as evidenced by an increase in type I collagen and VEGF. Acquisition of the adhesion phenotype was via a mechanism distinct from up-regulation of HIF-1α. These observations are consistent with the hypothesis that the adhesion phenotype represents a state of intracellular metabolic depletion.
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