Spatial and temporal control of laminin-511 and -332 expressions during catagen.
BACKGROUND
We recently reported that the basement membrane (BM) zone components laminin-511 and -332 precisely regulate hair growth spatially and temporally during the anagen stage of the hair cycle.


OBJECTIVE
In this study, we examined the localization and roles of laminin-511 and -332 during catagen in mice.


METHODS
Using tissue from C57BL/6 hair depilation model mice, we performed immunohistochemistry, in situ hybridization, western blotting, and quantitative reverse transcriptase polymerase chain reaction (QRT-PCR) studies.


RESULTS
Although the distribution of laminin-332 around the BM of lower hair follicles changed during catagen, its total expression was stable throughout catagen stages at both the mRNA and protein levels. In sharp contrast, in situ hybridization, western blotting, and QRT-PCR studies of laminin alpha 5 showed that laminin-511 expression was gradually downregulated. Moreover, while the injection of recombinant laminin-332 at anagen stage VI did not affect catagen progression, injection of a laminin-511-rich A549 cell conditioned media protein extract at anagen stage VI delayed progression of catagen.


CONCLUSIONS
These results indicated that downregulation of laminin-511 is important for hair regression.
Department of Dermatology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan.
Chiharu
C
Tateishi
Daisuke
D
Tsuruta
Koji
K
Sugawara
Katsutoshi
K
Yoshizato
Hisayoshi
H
Imanishi
Kazuyo
K
Nishida
Masamitsu
M
Ishii
Hiromi
H
Kobayashi
D000818:Animals; D001485:Basement Membrane / Q000378:metabolism; D015815:Cell Adhesion Molecules / Q000235:genetics / Q000378:metabolism*; D015536:Down-Regulation; D006197:Hair / Q000254:growth & development* / Q000378:metabolism*; D018859:Hair Follicle / Q000254:growth & development* / Q000378:metabolism*; D007797:Laminin / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D023421:Models, Animal; D014158:Transcription, Genetic; D000097794:Kalinin
D015815:Cell Adhesion Molecules; D007797:Laminin; D000097794:Kalinin; C531281:laminin-511, mouse