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Alopecia, hair loss abstracts ||
Vet Dermatol. 2002 Oct;13(5):283-92.
Chronic moderate heat dermatitis (erythema ab igne) in five dogs, three cats and one silvered langur.
Walder EJ, Hargis AM.
Venice, CA 90291, USA.
Erythema ab igne, an old and rare disease in the human literature, is an erythematous, often pigmented, reticular, macular dermatosis that occurs at the site of repeated exposure to moderate heat. We identified lesions consistent with erythema ab igne in five dogs, three cats and one silvered langur (Trachypithecus cristatus[Raffles, 1821]). In dogs and cats, the cutaneous lesion distribution typically reflected chronic exposure to moderate heat during lateral or sternal recumbency. The silvered langur developed cutaneous lesions on the dorsal neck from exposure to a heat lamp. Principal clinical lesions consisted of irregular areas of alopecia (7/9) and erythema (7/9), sometimes with hyperpigmentation (3/9). Principal histological features consisted of karyomegaly (9/9) and keratinocyte atypia (4/9), scattered apoptotic or vacuolated basal cells and/or apoptotic keratinocytes (6/9), mild mixed mononuclear interstitial or interface dermatitis (9/9) with adnexal atrophy (8/9), and a variable number of wavy eosinophilic elastic fibres (9/9). The presence of these cutaneous lesions in an animal indicates that the environment should be evaluated for exposure to chronic moderate heat, and the heat source should be eliminated or modified to prevent further exposure and progression of lesions.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12358613&dopt=Abstract
J Cutan Pathol. 2002 Oct;29(9):549-56.
Microtubule associated protein (MAP-2) expression defines the companion layer of the anagen hair follicle and an analogous zone in the nail unit.
Hallman JR, Fang D, Setaluri V, White WL.
Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, USA.
BACKGROUND: Microtubule associated protein 2 (MAP-2) is one of a group of polypeptides that are an integral component of the microtubular cytoskeletal structure of the central and peripheral nervous system. During the course of another investigation that utilized immunohistochemistry, MAP-2 expression was observed in the hair follicle, almost exclusively in the innermost layer of the outer root sheath of the anagen follicle. This innermost layer, the so-called companion layer, has unique properties that clearly distinguish it from the rest of the outer root sheath. Among these are diminished glycogenation and an intimate association with the Henle's layer, which it directly apposes. Numerous intercellular connections exist between the companion layer and Henle's layer and, in fact, the companion layer accompanies Henle's layer during its vertical ascent in the follicle. Circumferentially oriented keratin filaments have also been demonstrated between the companion layer and Henle's layer, apparently providing structural support to the inner root sheath. Experimentally, disturbances in the keratin filaments of the companion layer in animals ultimately results in destruction of the hair follicle and an alopecia. METHODS: Immunohistochemical studies for MAP-2 were performed on 25 additional paraffin-embedded scalp specimens using standard techniques. Because of the parallels between the follicle and nail, MAP-2 expression in the nail unit was also investigated in three specimens. RESULTS: The presence of MAP-2 in the companion layer was confirmed in all cases. Intense MAP-2 expression in the companion layer begins at the B-fringe (the start of the keratogenous zone with cornification of the Henle's layer of the inner sheath) and extends to the level of the isthmus where the inner root sheath exfoliates. MAP-2 is also expressed in the upper layers of the nail matrix. CONCLUSION: The expression of MAP-2 almost exclusively in the companion layer is probably related to the unique cytoskeletal structure of this microanatomic layer. Since experimental evidence has shown that the cell cytoskeleton is important to the integrity of the hair follicle, it is probable that MAP-2 expression is also important and disturbances in its expression could play a role in the pathogenesis of some alopecias. MAP-2 may play a similar role in the nail matrix.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12358813&dopt=Abstract
J Cutan Med Surg. 2003 Jan-Feb;7(1):43-6. Epub 2002 Oct 09.
Metastatic melanoma in a patient with Clouston syndrome successfully treated with isolated hyperthermic limb perfusion.
Parhizkar N, Jones VE, McClay EF, Yi ES, Bouvet M.
Department of Surgery, University of California San Diego Medical Center, San Diego, California 92161, USA.
BACKGROUND: Clouston syndrome is an autosomal dominant disorder characterized by nail dystrophy, partial or total alopecia, and hyperkeratosis of the palms and soles. OBJECTIVE: Although a variety of unusual cutaneous manifestations have been described, the incidence of melanoma in this population is unknown. METHODS: This article reports a case of in-transit metastatic subungual melanoma in a patient with Clouston syndrome successfully treated with hyperthermic limb perfusion with melphalan. RESULTS: Six months postperfusion, the patient is doing well, with resolution of the extremity erythema and edema. Followup ultrasonography revealed reduction in size of the eight subcutaneous nodules, with the largest measuring 3.3 cm in maximum diameter, representing nearly a 50% reduction in tumor volume postperfusion. CONCLUSION: Although melanoma has also been associated with some forms of ectodermal dysplasia, such as ectrodactyly--ectodermal dysplasia--clefting (EEC) syndrome, the incidence of melanoma in patients with Clouston syndrome is unknown. Thus far, to our knowledge, this is the first case report of melanoma arising in a patient with Clouston syndrome.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12362262&dopt=Abstract
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