References: Hair growth and hair loss
Naunyn Schmiedebergs Arch Pharmacol. 1987 Nov;336(5):538-45.
Cutaneous lesions in capsaicin-pretreated rats. A trophic role of capsaicin-sensitive afferents?
Maggi CA, Borsini F, Santicioli P, Geppetti P, Abelli L, Evangelista S, Manzini S, Theodorsson-Norheim E, Somma V, Amenta F, et al.
Pharmacology Department, A. Menarini Pharmaceuticals, Florence, Italy.
1. The time course and regional distribution of 'spontaneous' cutaneous lesions in rats desensitized to capsaicin as newborns was correlated to behavioural observations and regional distribution of substance P-like immunoreactivity (SP-LI) and tachykinin-like immunoreactivity (TK-LI) in various skin areas. 2. 'Spontaneous' skin lesions in the form of wounds, scabs and areas of alopecia were observed in 80-90% of rats desensitized to capsaicin. No major sex-related differences were observed with regard to incidence and distribution of the lesions with the possible exception of a lesser tendency to bilateral lesions in female rats. 3. 'Spontaneous' skin lesions were almost restricted to the head: the areas most frequently affected were snouts, periocular and retroauricular regions and ventral area of the neck. 4. No major differences were observed between capsaicin- or vehicle-treated animals in spontaneous or novelty-induced grooming as well as in open-field gross behaviour. Likewise, no differences were observed in the mouse-killing behaviour. 5. Both SP-LI and TK-LI in various skin areas were significantly reduced by systemic capsaicin pretreatment. The rank order of various skin areas for SP-LI or TK-LI levels was: snouts greater than thigh greater than neck greater than abdomen approximately equal to retroauricular region. 6. Intradermal injection of Arg-neurokinin B, a potent and water soluble derivative of neurokinin B, produced a similar plasma extravasation (Evans blue leakage technique) in the skin of vehicle- or capsaicin-pretreated rats. 7. In capsaicin-desensitized rats fur regrowth (measured at abdominal level, 28 days after shaving) was significantly less than in vehicle-treated animals.(ABSTRACT TRUNCATED AT 250 WORDS)
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2449621&dopt=Abstract
Dtsch Tierarztl Wochenschr. 1989 Oct;96(9):438-45.
Thirteen-weeks subcutaneous treatment with high dose of natural sex hormones in rats with special reference to their effect on the pituitary-gonadal axis. I. Oestradiol.
Attia MA, Zayed I.
A high dose of oestradiol (0.3 mg/kg/day) was administrated subcutaneously to male and female rats daily for 13 weeks. The effects of hormonal treatment on various parameters were studied. The results revealed that treatment with oestradiol resulted in alopecia, retarded hair regrowth, decreased body weight and food consumption and reduced Hb, PCV and total RBCs. Neutrophilic leucocytosis, elevated ESR, and decreased blood glucose levels were also observed. Atrophy of the ovaries, testes and secondary sex organs was also recorded. The uterus of the oestradiol treated rats displayed endometrial epithelial cell hyperplasia and hypertrophy of the myometrium. The pituitary gland of the rats with oestradiol had a significant increase in the number of PRL and ACTH cells together with cytological criteria indicative of increased secretory activity; the gonadotropin-producing cells showed involutionary changes. The mammary glands of the oestradiol treated rats showed maximal stromal and ductal proliferation and minimal acinar proliferation.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2531069&dopt=Abstract
Acta Derm Venereol. 1985;65(1):64-6.
Increase of mast cells in the alopecia lesion of mice.
Tanii T, Okada T, Fukai K, Nakagawa K, Hamada T.
A histological investigation was made of the quantitative behavior of mast cells in bald areas on mice and in human alopecia areata. C57BL,W/Wv and +/+ mice with alopecia lesions were examined. In C57BL mice and +/+ mice, the number of dermal mast cells (per square mm) in the bald areas was greater than that in controls. The mean number of mast cells was slightly higher in human alopecia areata than in the controls. Since W/Wv mice lacking mast cells developed alopecia lesions, it seems that mast cells are not necessary for the onset of alopecia areata but could play some part in regrowth.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2578708&dopt=Abstract
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