Distribution of BrdU label-retaining cells in eccrine sweat glands and comparison of the percentage of BrdU-positive cells in eccrine sweat glands and in epidermis in rats.

Abstract:

:Bromodeoxyuridine (BrdU) has commonly been used for detecting of label-retaining cells (LRCs). To determine if there are LRCs and the distributions of LRCs in eccrine sweat glands, 20 newborn SD rats within 24 h after birth were injected intraperitoneally with 50 mg/kg/time BrdU four consecutive times at 2-h intervals, or twice daily at 2-h intervals for four consecutive days. Six weeks after the last BrdU injection, rats were sacrificed, and the hind footpads were harvested, fixed and embedded in paraffin. Five-micrometer thickness tissue sections were cut and the expression of BrdU was detected immunohistochemically. The results showed that BrdU(+) cells were scatteredly distributed in coiled secretory part and coiled duct, as well as the straight duct, but not the intraepidermal duct of eccrine sweat glands. In secretory part, besides secretory cells, myoepithelial cells showed label retaining. The percentage of BrdU(+) cells in eccrine sweat gland of rat footpads had no significant difference between the two injection methods of BrdU (50 mg/kg/time BrdU four consecutive times at 2-h intervals vs. 50 mg/kg/time BrdU twice daily at 2-h intervals for four consecutive days) (P > 0.05). The percentage of BrdU(+) cells in eccrine sweat glands (4.2 ± 1.3 %) was significantly higher than that in stratum basale of epidermis (0.5 ± 0.1 ‰) (P < 0.05). In conclusion, there were LRCs in eccrine sweat glands of rat footpads, and these LRCs might play important roles in the homeostasis of skin and its appendages.

journal_name

Arch Dermatol Res

authors

Chen L,Zhang M,Li H,Tang S,Fu X

doi

10.1007/s00403-013-1397-7

subject

Has Abstract

pub_date

2014-03-01 00:00:00

pages

157-62

issue

2

eissn

0340-3696

issn

1432-069X

journal_volume

306

pub_type

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