Skin Deep - Clinical & Cosmetic Dermatology Blog

Skin Deep is a blog for dermatologists and skin care professionals with focus on theoretical, cosmetic and aesthetic dermatology. This blog is associated with ‘Dermatologists Sans Borders’ one of the largest curated groups of skin care professionals on facebook. If you are looking for non-technical information, please visit

The paracrine effect (PRP Part 3)

DAXX pathway in TGF beta signaling
DAXX pathway in TGF beta signaling (Photo credit: Wikipedia)

This is a critical exploration of the potential utility (or otherwise) of Platelet Rich Plasma (PRP) in cosmetic treatments. Please read Part 1 & 2.

Transforming growth factor beta (TGF-β) is a s...
Transforming growth factor beta (TGF-β) is a secreted protein that controls proliferation, cellular differentiation, and other functions in most cells. (Photo credit: Wikipedia)
Coming to Transforming growth factor beta, TGF-β is a protein that has an inhibitory control over cellular proliferation and differentiation especially epithelial cells. TGF-β induces apoptosis in many cell types through the SMAD and DAXX pathways. It blocks advance through the G1 phase of the cell cycle. Higher concentrations of TGF-β are found in Alzheimer's Disease and Keratoconus. In short it has an effect opposite to that of PDGF.

Fibroblast growth factor (FGF) is a "promiscuous" growth factor with multiple actions on multiple cell types. In mature tissues/systems it is mostly involved in angiogenesis, keratinocyte organization, and wound healing processes. Its two variants FGF1 and FGF2 are more potent angiogenic factors than vascular endothelial growth factor (VEGF) or platelet-derived growth factor(PDGF) and can give rise to granulation tissue.  FGF can bind heparan sulfates in extracellular matrix and could have a paracrine effect that is very important in PRP.

Read all articles in this series on PRP.

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About Me

As a Dermatologist and Informatician my research mainly involves application of bioinformatics techniques and tools in dermatological conditions. However my research interests are varied and I have publications in areas ranging from artificial intelligence, sequence analysis, systems biology, ontology development, microarray analysis, immunology, computational biology and clinical dermatology. I am also interested in eHealth, Health Informatics and Health Policy.


Bell Raj Eapen
Hamilton, ON