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JCS ePress
online publication date 20 May 2003
doi: 10.1242/jcs.00475
Research Article
3
1-integrin regulates hair follicle but not interfollicular morphogenesis in adult epidermis
Francesco J.A. Conti,
Robert J. Rudling,
Alistair Robson,
and
Kairbaan M. Hodivala-Dilke*
* Author for correspondence (e-mail: kairbaan.hodivala-dilke{at}cancer.org.uk)
3
1-integrin is abundantly expressed in the epidermis, and in mice, ablation of the
3 gene results in embryonic defects and perinatal lethality. To determine the role of
3- integrin in adult skin development, we grafted skin from newborn
3-integrin-deficient mice on to ICRF nu/nu recipients. We report that adult
3-integrin-deficient skin has severe abnormalities restricted to hair follicle morphology, which include stunted hair follicle growth, increased hair follicle fragility, aberrant pigment accumulation and formation of hair follicle clusters. These abnormalities are caused by a combination of defects in: (1) keratinocyte cytoskeletal organisation, (2) outer root sheath architecture and (3) integrity of the lamina densa. Our results indicate that
3
1 is not essential for adult interfollicular epidermal differentiation, but it is required to direct several processes important in hair follicle maintenance and morphogenesis.
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