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Genomics 2003 Jan;81(1):6-14
Curly bare (cub), a new mouse mutation on chromosome 11 causing skin and hair abnormalities, and a modifier gene (mcub) on chromosome 5.
In the outcrossing of a new recessive mouse mutation causing hair loss, a new wavy-coated phenotype appeared. The two distinct phenotypes were shown to be alternative manifestations of the same gene mutation and attributable to a single modifier locus. The new mutation, curly bare (cub), was mapped to distal Chr 11 and the modifier (mcub) was mapped to Chr 5. When homozygous for the recessive mcub allele, cub/cub mice appear hairless. A single copy of the dominant Mcub allele confers a full, curly coat in cub/cub mice. Reciprocal transfer of full-thickness skin grafts between mutant and control animals showed that the skin phenotype was tissue autonomous. The hairless cub/cub mcub/mcub mice show normal contact sensitivity responses to oxazolone. The similarity of the wavy coat phenotype to those of Tgfa and Egfr mutations and the map positions of cub and mcub suggest candidate genes that interact in the EGF receptor signal transduction pathway.
Plastic and Reconstructive Surgery 2003; 111(1):414-421
Hair Transplantation for Men with Advanced Degrees of Hair Loss
In the field of surgical hair restoration, there is probably no greater challenge than treating the individual with advanced male pattern hair loss. Recent developments in follicular unit grafting and recognition of the natural appearance of the transplanted frontal forelock have now made it possible to obtain excellent, undetectable results in these patients. Over a 22-month period, the onset correlating with the time when the author began to use the technique of follicular unit grafting, 61 of 322 hair transplant procedures (approximately 20 percent) performed for male pattern hair loss were on men with, or at high risk of developing, advanced male pattern hair loss. Uniformly, the creation of some type of frontal forelock provided excellent results and high patient satisfaction. The concept of the frontal forelock is not new. Developments in aesthetic principles, enhanced understanding of its applicability, and the applied advantages of follicular unit grafting allow for the first time, truly undetectable results.
Clin Exp Dermatol 2002 Jul;27(5):358-65
Assessment of hair loss: clinical relevance of hair growth evaluation methods.
This review on hair growth measurement methods focuses on human scalp hair in the context of clinically relevant assessment of hair loss. This phenomenon is the end result of a complex combination of events closely associated with hair cycling followed by defective hair replacement. The methodological spectrum ranges from the most to the least invasive approach. All of the measurement methods referred to are critically reviewed, with their stronger and weaker aspects, in view of their potential application in the skin and hair clinic. The existence of recently developed highly resolutive noninvasive analytical methods capable of exploring almost every aspect of the dynamics of this growth and loss phenomenon allowed calibration of more global scoring method. From this review, the author concludes that a combination of a highly resolutive analytical approach with a global calibrated method seems advisable in the context of the monitoring of hair growth changes for better or worse, i.e. scalp hair growth or hair loss in the hair clinic.
Indian J Cancer 2000 Jun-Sep;37(2-3):95-104
Occurrence and severity of alopecia in patients on combination chemotherapy.
The aim of the study was to evaluate the occurrence and severity of alopecia resulting from combination chemotherapy on cancer patients. The study was conducted during the period 1994-1996 on 58 confirmed cases of malignancies attending the Kasturba Medical College Hospital, Mangalore, South India. The treatment regimens followed were standard protocols recommended for those malignancies and which are widely adopted. Specific drug combinations, their dosage and routes and schedules of administration were studied. The influence of 20 different treatment regimens, most of them in combination chemotherapy, were studied. The patients studied were not receiving any other medication which could have caused alopecia as observed in the present study. The pathophysiology of the hair, as influenced by the treatment regimens, were studied by examination of samples of the affected hairs under a Leica compound microscope. Alopecia was the most dominant side effect influencing 35 of the 58 patients undergoing the treatment (60%). The severity of alopecia was assessed by grouping them in four distinct grades. Specific drugs and their combinations causing varying degrees of severity were identified. The initiation of hair loss in different treatment regimens were analysed. It is seen that alopecia is an early manifestation of cutaneous side effects of cancer chemotherapy. In a majority of patients, the manifestation initiated after the first or the second cycle of administration of the rapeutic regimen, indicating a time interval of 1 to 8 weeks after the start of chemotherapy. Single agent drugs, when used alone or in combination with immunomodulator drugs seem to cause much less side effects, including alopecia, when compared to multiple drug regimens. Microscopic examination of the affected hair showed trichorrhexis, fragmentation, decrease in diameter and depigmentation of the hair shaft.
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