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Title: Regulation of hair growth : prostaglandins and prostamides : studies confirming the growth stimulating effects of prostanoids and prostamides on human hair follicles in organ culture and locating their receptors using lipidomics, molecular biological and immunohistological approaches
Author: Khidhir, Karzan Ghafur
ISNI:       0000 0004 2714 0695
Awarding Body: University of Bradford
Current Institution: University of Bradford
Date of Award: 2010
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Hair growth disorders cause significant psychological distress, but are poorly controlled. Since prostaglandin F₂α (PGF₂α) and prostamide F₂α analogue glaucoma treatments cause eyelash growth as side-effects, they may be useful for alopecia. How they function is unknown; possibilities include direct action on hair follicles or stimulating follicular blood flow. It is important to clarify whether scalp follicles can also respond as human follicle response to androgens differ with body site. Therefore, human scalp follicles were grown in vitro in organ culture with PGF₂α, latanoprost, a PGF₂α analogue, and bimatoprost, a prostamide F₂α analogue, with, or without, appropriate antagonists, and the presence of PGF₂α (FP) and prostamide F₂α receptors were investigated using molecular biological and immunohiostochemical methods. Each treatment significantly stimulated follicle growth rate, the percentage of growing follicles, and the amount of hair produced in a dose-responsive manner (10nM-1μM); the receptor antagonists blocked these effects. Immunohistochemistry of frozen scalp sections demonstrated FP protein only in dermal papillae and connective tissue sheaths. RT-PCR identified FP and various prostamide F₂α receptors in anagen follicles and isolated dermal papillae and bulbar connective tissue sheath, but not in bulb matrix or other epithelial tissues. Therefore, isolated human scalp hair follicles can respond biologically to PGF₂α and related pharmaceuticals in organ culture via follicular receptors and express the genes and protein for FP and prostamide F₂α receptors. PGF₂α-related drugs appear to act directly on follicles via receptors in the regulatory dermal papilla. They offer an exciting, novel approach for treating alopecia and merit clinical investigation.
Supervisor: Randall, Valerie A. ; Picksley, Stephen Sponsor: Kurdistan Regional Government/Ministry of Higher Education and Scientific Research
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Alopecia ; Balding ; Bimatoprost ; Hair follicle ; Human ; Organ culture ; Prostaglandin F2? ; Treatment ; Prostaglandins ; Prostamide F2? ; Prostamides