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Mechanisms of androgen induction of sebocyte differentiation
R L Rosenfield1, D Deplewski, A Kentsis
1Department of Pediatrics, University of Chicago Pritzker School of Medicine, Ill., USA.
Abstract:
It has been difficult to induce the expected sebocyte differentiation in vitro with dihydrotestosterone (DHT). We reasoned that our culture system lacks differentiating factors, and peroxisome proliferator-activated receptors (PPARs) were the prime candidates. We tested PPAR activators informative about diverse PPAR subtypes, with and without DHT (10(-6) M): BRL-49653 (10(-6) M, PPAR-gamma), WY-14643 (10(-6) M, PPAR-alpha), and linoleic acid (LIN, 10(-4) M, PPAR-delta). Treatments were added in serum-free medium to cultures of rat preputial sebocytes. Control, DHT, BRL and BRL + DHT treatments caused 11, 25, 66 and 80%, respectively, of preputial cell colonies to differentiate into lipid-forming colonies (LFCs) (p < 0.001). WY induced 20% and LIN over 95% LFC formation. PPAR-gamma mRNA was identified in preputial sebocytes by the RNase protection assay. These data suggest that differentiation of sebocytes is transduced by PPARs and have implications for the development of new treatments for acne.
Insights
Peroxisome proliferator-activated receptors (PPARs) are key to sebocyte differentiation. PPAR activation, particularly PPAR-delta, significantly enhances lipid formation in sebocytes, offering new acne treatment possibilities.
Area of Science:
- Dermatology
- Molecular Biology
- Cell Biology
Background:
- Dihydrotestosterone (DHT) has shown limited success in inducing sebocyte differentiation in vitro.
- The current in vitro culture system may lack essential differentiating factors for sebocytes.
- Peroxisome proliferator-activated receptors (PPARs) are hypothesized to be crucial differentiating factors.
Purpose of the Study:
- To investigate the role of PPARs in sebocyte differentiation.
- To evaluate the effect of various PPAR activators on sebocyte differentiation in vitro.
- To determine if PPARs can enhance DHT-induced sebocyte differentiation.
Main Methods:
- Rat preputial sebocytes were cultured in serum-free medium.
- Cells were treated with DHT alone, PPAR activators alone (BRL-49653 for PPAR-gamma, WY-14643 for PPAR-alpha, linoleic acid for PPAR-delta), or combinations.
- Lipid-forming colony (LFC) formation was quantified to assess differentiation.
- PPAR-gamma mRNA expression was confirmed using RNase protection assay.
Main Results:
- DHT treatment increased LFC formation to 25% compared to control (11%).
- BRL-49653 (PPAR-gamma activator) alone induced 66% LFC formation.
- The combination of BRL-49653 and DHT resulted in 80% LFC formation.
- WY-14643 (PPAR-alpha activator) induced 20% LFC formation.
- Linoleic acid (PPAR-delta activator) induced over 95% LFC formation.
- PPAR-gamma mRNA was detected in rat preputial sebocytes.
Conclusions:
- Sebocyte differentiation is significantly mediated by PPARs.
- PPAR-delta activation is highly effective in inducing sebocyte differentiation.
- These findings suggest potential therapeutic strategies for acne targeting PPARs.