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(American Journal of Pathology. 2002;161:693-703.)
© 2002 American Society for Investigative Pathology

Animal Models

Impaired Hair Follicle Morphogenesis and Cycling with Abnormal Epidermal Differentiation in nackt Mice, a Cathepsin L-Deficient Mutation

Fernando Benavides^*, Matthew F. Starost, Mónica Flores^*, Irma B. Gimenez-Conti^*, Jean-Louis Guénet and Claudio J. Conti^*

From the Science Park-Research Division,^*The University of Texas M. D. Anderson Cancer Center, Smithville, Texas; the Science Park Department of Veterinary Sciences,Bastrop, Texas; and the Unité de Génétique des Mammifères,Institut Pasteur, Paris, France

Abstract

We previously described an autosomal-recessive mutation named nackt (nkt) exhibiting partial alopecia associated with CD4⁺ T-cell deficiency. Also, we recently reported that nkt (now Ctsl^nkt) comprises a deletion in the cathepsin L (Ctsl) gene. Another recent study reported that Ctsl knockout mice have CD4⁺ T-cell deficiency and periodic shedding of hair, which recapitulate the nkt mutation and the old furless (fs) mutation. The current study focuses on the dermatological aspects of the nkt mutation. Careful histological analysis of skin development of homozygous nkt mice revealed a delayed hair follicle morphogenesis and late onset of the first catagen stage. The skin of Ctsl^nkt/Ctsl^nkt mice showed mild epidermal hyperplasia and hyperkeratosis, severe hyperplasia of the sebaceous glands, and structural alterations of hair follicles. Epidermal differentiation seems to be affected in nkt skin, with overexpression of involucrin and profilaggrin/filaggrin along with focal areas of keratin 6 expression in the interfollicular epidermis. Severe epidermal hyperplasia, acanthosis, orthokeratosis, and hyperkeratosis were only observed in mice maintained in nonpathogen-free environments. The analysis of Rag2-/- Ctsl^nkt/Ctsl^nkt double-mutant mice indicates that the skin defect remains under the absence of T and B cells. This animal model provides in vivo evidence that cysteine protease cathepsin L plays a critical role in hair follicle morphogenesis and cycling, as well as epidermal differentiation.

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