5α-reductase inhibition
What is 5α-reductase inhibition?
5α-reductase inhibition testing evaluates whether ingredients reduce conversion of testosterone to dihydrotestosterone, an androgen involved in sebaceous gland activity. It provides mechanism-level evidence for oily-skin ingredient research.
Why do you need this service?
Use 5α-reductase assays to compare inhibition of testosterone-to-DHT conversion in a defined enzyme or cellular system. Follow-up sebocyte measurements can investigate whether the response affects lipid behavior.
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5α-reductase inhibition
Within sebaceous gland testing, this assay focuses on the enzyme that converts testosterone to dihydrotestosterone (DHT). DHT contributes to androgen signaling, but enzyme inhibition alone does not demonstrate reduced surface sebum or improvement in blemishes.
Measuring enzyme activity
Enzyme preparations or suitable cellular systems are exposed to test ingredients over a defined concentration range. Measurement of DHT formation, for example by LC-MS, provides a direct conversion endpoint. NADPH consumption can be an indirect readout but requires controls for other reactions and sample interference.
- Isoform selection appropriate to the research question
- Vehicle and reference-inhibitor controls
- Concentration-response analysis and IC50 calculation where supported
Relating inhibition to sebocyte behavior
Sebocyte models can complement the enzyme assay with lipid accumulation, lipid output, or composition measurements. Viability testing helps distinguish a functional response from loss of cells. These studies guide ingredient comparison and concentration selection for further development, not proof of hormonal treatment effects or finished-product oil control.
Applications of sebaceous 5α-reductase studies
Measuring conversion
The brief should identify the relevant isoform, sample preparation and reference inhibitor. DHT formation provides a direct conversion endpoint where the analytical method is suitable. NADPH consumption is indirect and needs controls for other reactions and sample interference.
Investigating oil-control relevance
Supported concentration-response data can yield an assay-specific IC50. It does not define a universal effective formulation range. Sebocyte lipid and viability measurements can add context, while surface-sebum reduction and finished-product oil-control claims require evidence on those outcomes.
Investigate sebaceous-gland and oily-skin mechanisms through sebocyte differentiation, lipid production and inflammatory responses in laboratory models. Explore another Sebaceous Gland & Oily Skin page on cosmetic-labs.com.