Journal of Clinical and Investigative Dermatology
Research Article
Targeting Keloid Fibroblasts by Inhibition of Hypoxia Signaling
Richert-Jones J1, Mantel A1, Ricks-Santi L2, Harvey V1 and Chan J1*
1Hampton University Skin of Color Research Institute, USA
2Hampton University Cancer Research Center, USA
*Address for Correspondence: Joanne Chan, Scientific Director and Associate Professor, Hampton University Skin of Color Research Institute (HUSCRI) 100 William R. Harvey Way, Hampton, VA 23668, Hampton, VA 23668, USA, Tel: 757-726-6058; E-mail: joanne@chanlab.org
Submission: 26 August, 2020;
Accepted: 28 September, 2020;
Published: 30 September, 2020
Copyright: © 2020 Richert-Jones J, et al. This is an open access article
distributed under the Creative Commons Attribution License, which permits
unrestricted use, distribution, and reproduction in any medium, provided the
original work is properly cited.
Abstract
Keloids are persistent raised scars that are difficult to treat because attempts
at removal typically results in recurrence. Keloid fibroblasts are the abnormal
cell type responsible for the continuous scar protein deposition in this fibrotic
skin disease that involves enhanced TGFβ activity. An effective therapy that can
eliminate keloid fibroblasts and promote normal healing is needed. We examined
the cellular and molecular differences between keloid and normal skin fibroblasts
to identify characteristics that may be targeted for therapy. By limiting serum and/
or glucose availability, we found that keloid fibroblasts are sensitive to glucose levels
but not to serum withdrawal. Treatment with 2- deoxyglucose, a preclinical drug
that blocks glycolytic metabolism, can reduce keloid fibroblast cell size. However,
recovery occurs upon drug removal, indicating a cytostatic effect. To eliminate
keloids, it would be necessary to induce cell death in order to disrupt the cycle of
continuous fibrosis. Thus, we examined the role of HIF-1, a central transcription
factor that regulates both glycolytic metabolism and fibrosis, to determine whether
blocking its activity in keloid fibroblasts could yield a cytotoxic outcome. Using
a chemical inhibitor against HIF-1, we observed a significant reduction in keloid
fibroblast numbers. Although small molecule HIF-1 inhibitors have been under
development for anemia and cancer therapy, their role in regulating fibrotic genes
has led researchers to consider their potential use in the treatment of lung or kidney
fibrosis. Since keloid disease may be considered a form of chronic skin fibrosis,
reducing HIF-1 activity could provide a therapeutic strategy for keloid treatment.