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References: Hair growth and hair loss

Ophthalmic Surg. 1992 Mar;23(3):179-82.
Experimental comparison of laser and cryosurgical cilia destruction.

Gossman DM, Brightwell JR, Huntington AC, Newton C, Yung R, Eggler S.

Department of Ophthalmology and Visual Sciences, University of Louisville School of Medicine, Ky 40202.

We compared cryosurgery with the argon and carbon dioxide lasers in a rabbit model to evaluate the permanence of eyelash destruction as well as the gross and histologic effects on the eyelid. Each modality was equally effective in preventing eyelash regrowth. Cryosurgery and the carbon dioxide laser produced the greatest acute soft tissue swelling; the carbon dioxide laser produced the most pronounced gross eyelid alterations. The argon laser produced minimal eyelid tissue change. Long-term histologic tissue alterations were not striking and were confined to eyelids treated with cryosurgery and the carbon dioxide laser. We conclude that, of the two lasers, the argon is the best suited to the clinical treatment of trichiasis: it is widely available, more precise in limiting contiguous tissue destruction when delivered through a slit lamp, and is safer for use near the eye.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1574286&dopt=Abstract

J Dermatol. 1999 Dec;26(12):797-802.
Characterization of infiltrating T cells in human scalp explants from alopecia areata to SCID nude mice: possible role of the disappearance of CD8+ T lymphocytes in the process of hair regrowth.

Tsuboi H, Tanei R, Fujimura T, Ohta Y, Katsuoka K.

Department of Dermatology, Kitasato University School of Medicine, Sagamihara, Japan.

T cells may play a role in the pathogenesis of alopecia areata (AA). We attempted to elucidate the linkage between infiltrating T cells and hair regrowth processes by grafting scalp skin from the affected region of patients with AA onto severe combined immune deficiency (SCID) nude mice. When the AA scalp was grafted into the mice, the grafts were accepted, and normal hair regrowth was observed. Before grafting, CD4+ and CD8+ T cells had infiltrated into the peribulb area. After grafting, the telogen hair shifted to anagen hair, and the CD4+ and CD8+ T cell infiltrates in the bulb area decreased in all cases. CD8+ T cells had almost disappeared from all portions of the follicles. It has been suggested that CD8+ T cells play a crucial role in the pathogenesis of AA. The absence of CD8+ T lymphocytes that responded to follicular autoantigens may induce hair regrowth in the grafted skin. In addition, the CD4+ human T cells that had infiltrated or still remained in the upper-middle portions including the bulge area accompanied the HLA-DR expression after grafting. Infiltrating or surviving T cell phenotypes and locations changed during the hair cycle in the grafts. These results indicate that the location of infiltrated T cells and their phenotypes may participate not only in hair loss but also in regrowth of hair in AA.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10659500&dopt=Abstract

Int J Radiat Oncol Biol Phys. 1992;23(2):333-7.
Subcutaneous or topical administration of 16,16 dimethyl prostaglandin E2 protects from radiation-induced alopecia in mice.

Hanson WR, Pelka AE, Nelson AK, Malkinson FD.

Loyola-Hines Department of Radiotherapy, Hines VA Medical Center, IL 60141.

Alopecia, a common sequel of radiation treatment of brain tumors, increases patient stress to the extent that refusal of treatment may occur. The expectation that loss of hair will be prevented, or that regrowth will occur, is extremely important to patients. To investigate prostaglandin-induced radiation protection against alopecia, the hair of B6D2F1 male mice was plucked from the right thigh and surrounding area to induce anagen. Fourteen days later, mice were injected subcutaneously in the neck with 10 micrograms 16,16 dm PGE2 in 0.2 ml of vehicle, or with the vehicle alone. In another group of previously plucked mice, 16,16 dm PGE2 in the same concentration, or the vehicle was applied topically. One hour later, graded single doses from 6.5 to 12.5 Gy 137Cs gamma irradiation were given to groups of six animals. On day 21 post-plucking, all animals were killed and a portion of the irradiated site was excised. The average hair counts per field in irradiated animals were 85 +/- 4 (6.5 Gy), 25 +/- 5 (8.5 Gy), and 5.5 +/- 0.7 (10 Gy). Animals receiving the prostaglandin systemically had values of 60 +/- 10 (6.5 Gy), 54 +/- 3 (8.5 Gy), 66 +/- 6 (10 Gy), and 30.1 +/- 8 (12.5 Gy). Topical application of the prostaglandin resulted in protection that yielded 52 +/- 3 (8.5 Gy), 34 +/- 4 (10 Gy), and 3.2 +/- 0.9 (12.5 Gy) hairs per field. Both systemic and topical application of 16,16 dm PGE2 protected from some degree of radiation-induced alopecia, which supports the conclusion that prostaglandins may be useful in the protection of hair follicles in patients treated with radiation for brain tumors.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1587754&dopt=Abstract

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