Researchers from the University of California have discovered that a signalling molecule called SCUBE3 potently stimulates hair growth and may offer therapeutic treatment for androgenetic alopecia, a common form of hair loss in both women and men.

The precise mechanism uses dermal papilla cells, which play a pivotal role in controlling hair growth.

These cells specialise in signal-making fibroblasts at the bottom of each hair follicle, which promotes new hair growth.

The production of activating molecules by the dermal papilla cells is critical for efficient hair growth in mice and humans. In people with androgenetic alopecia, dermal papilla cells malfunction, greatly reducing the normally abundant activating molecules.

The genetic basis of the activating molecules involved has been previously poorly understood, so the researchers used a mouse model with hyperactivated dermal papilla cells and excessive hair to facilitate more discoveries about hair growth regulation.

After the researchers microinjected SCUBE3 into mouse skin, where human scalp follicles had been transplanted, new growth began in both the dormant human and surrounding mouse follicles.

Maksim Plikus, Ph.D., UCI professor of developmental & cell biology, said: At different times during the hair follicle life cycle, the very same dermal papilla cells can send signals that either keep follicles dormant or trigger new hair growth.

We revealed that the SCUBE3 signalling molecule, which dermal papilla cells produce naturally, is the messenger used to tell the neighbouring hair stem cells to start dividing, which heralds the onset of new hair growth.

Co-first author Yingzi Liu, a UCI postdoctoral researcher in developmental & cell biology, added: Studying this mouse model permitted us to identify SCUBE3 as the previously unknown signalling molecule that can drive excessive hair growth.

Currently, there are two medications on the market, finasteride and minoxidil, which have been approved by the Food and Drug Administration for androgenetic alopecia in the USA.

Finasteride is only approved for use in men, but both drugs are not universally effective and need to be taken daily to maintain their clinical effect. SCUBE3 could be an alternative to these medications in the future.

co-first author Christian Guerrero-Juarez, a UCI postdoctoral researcher in mathematics, said: These experiments provide proof-of-principle data that SCUBE3 or derived molecules can be a promising therapeutic for hair loss.

Plikus finalised: There is a strong need for new, effective hair loss medicines, and naturally occurring compounds that are normally used by the dermal papilla cells present ideal next-generation candidates for treatment. Our test in the human hair transplant model validates the preclinical potential of SCUBE3.

Read more:
SCUBE3 as a treatment for hair loss and alopecia - Open Access Government