Stress-induced Apoptosis of LRCs and CD98-positive Cells in the Hair Follicle Bulge
World Small Animal Veterinary Association World Congress Proceedings, 2007
A-Young Jeong1; Seong-Joon Yi2; Tae-Ho Oh1
1Department of Veterinary Internal Medicine and 2Department of Anatomy, College of Veterinary Medicine, Kyungpook National University
Daegu, Republic of Korea

Stress-induced alopecia in mice characterize premature onset of catagen accompanied by apoptosis predominantly in bulge region of hair follicle, the residence of stem cells and transit-amplifying cells. However, our understanding still elucidated which type of bulge cells have been more sensitive destroyed, if these attack would be associated with irreversible hair growth inhibition, and whether the gender difference existed or not. Therefore, we investigated stress-induced bulge region apoptosis using LRCs (BrdU) and NOVEL transit-amplifying cell marker (CD98) in chronic stress mouse model. Using anti-BrdU, anti-CD98 antibodies and TUNEL kit, triple-immunofluoresce method was performed to study hair follicle bulge region apoptosis. Statistical analysis was done by the Mann-Whitney U/Wilcoxon rank tests (SAS ver. 9.0). High levels of BrdU- and CD98-positive cells expressed in bulge region, and expression of CD98-positive cells were more expressed than that of BrdU. Intrafollicular apoptosis was significantly increased in stressed groups (p < 0.0001). Apoptosis of BrdU (p < 0.001) and CD98-positive cells (p < 0.01) in stressed group was significantly increased. Taken together, these results suggest stressed group revealed sensitive destroyed both LRCs and CD98-positive cells in bulge region. Our findings demonstrate that apoptosis or decrease of LRCs population on the conditions of stress may lead to permanent hair loss.

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Tae-Ho Oh
College of Veterinary Medicine, Kyungpook National Unviersity
Republic of Korea

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