References: Hair growth and hair loss
Aust J Biol Sci. 1980 May;33(2):125-36.
Changes in the matrix proteins of wool and mouse hair following the administration of depilatory compounds.
Gillespie JM, Frenkel MJ, Reis PJ.
After sheep were defleeced with mimosine, cyclophosphamide or N-[5-(4-aminophenoxy)pentyl]-phthalimide, the first samples of the new growth of wool differed markedly in composition from the pretreatment samples, there being substantial reductions in the high-tyrosine proteins and increases in the high-sulfur proteins. Similar results were obtained with mice dehaired with mimosine and with sheep treated with low levels of mimosine which resulted in weakened wool rather than depilation. The composition of later samples of the regrowth wool showed progressive changes with time. The high-tyrosine proteins tended to approach the pretreatment levels, although this may take up to 12 weeks to occur, whereas the levels of high-sulfur proteins, after the initial increase, often fell below normal. In experiments involving defleecing with cyclophosphamide, the level of the latter proteins was still below normal after 3 months. The possibility that this altered protein composition of keratin fibres is characteristic of that portion of fibre first produced by a new or regenerating follicle was investigated in sheep and mice. It was found that wool follicles regenerating after plucking, and newly operating follicles in young sheep and mice, also produced wool and hair with a reduced content of high-tyrosine proteins. It is suggested, therefore, that the apparent long-term inhibition of the high-tyrosine proteins may not be the direct consequence of the administration of the chemical but rather be characteristic of normal wool and hair regrowth. Infusion of an amino acid mixture lacking methionine into the abomasum of sheep caused the growth of weak wool but did not suppress the synthesis of the high-tyrosine proteins. This is in contrast with previous findings that treatments which weaken wool also suppress high-tyrosine proteins.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=7436862&dopt=Abstract
J Am Vet Med Assoc. 1980 Dec 1;177(11):1117-22.
Canine hypothyroidism: a retrospective study of 108 cases.
Nesbitt GH, Izzo J, Peterson L, Wilkins RJ.
Hypothyroidism, defined as a serum concentration of less than 70 ng of triiodothyronine (T3)/dl or less than 1.5 microgram of thyroxine (T4)/dl, or both, was diagnosed in 108 dogs by means of radioimmunoassay techniques. Both T3 and T4 values were determined in 96 dogs. Both values were low in approximately 50% (47/96) of the hypothyroid dogs; 25% (24/96) were T3 hypothyroid (low T3, normal T4), and 26% (25/96) were T4 hypothyroid (normal T3, low T4). The T3 values varied markedly between animals. Common clinical signs were alopecia, changes in coat (dryness, dullness, dandruff, scales, coarseness, and slow regrowth of hair), hyperpigmentation, and pyoderma. Doberman Pinschers, Great Danes, Poodles, Schnauzers, Irish Setters, and Boxers accounted for 50% (54/108) of the hypothyroid dogs. Therapy consisted of T4, T3, or combination T3 and T4 replacement. A good clinical response was observed with T4 replacement in 40.4% (19/47) within 2 months and in 21.3% (10/47) within 5 months. A poor clinical response was observed in 25.5% (12/47) after 6 months of therapy. Posttherapeutic evaluation was based on peak serum concentrations of T3 and T4, pretreatment (basal) thyroid hormone values, type of replacement therapy, dosage and time of sampling after treatment, concurrent clinical problems, and, most important, clinical response to thyroid replacement therapy.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=7440313&dopt=Abstract
Dermatol Surg. 1995 Dec;21(12):1056-9.
Mini-slit graft hair transplantation using the Ultrapulse carbon dioxide laser handpiece.
Ho C, Nguyen Q, Lask G, Lowe N.
Division of Dermatology, UCLA Medical Center, USA.
BACKGROUND. The new Ultrapulse carbon dioxide (CO2) laser technology has added a new dimension to many cosmetic surgery procedures including hair transplantation. Early reports by Unger and David (Laser Hair Transplantation. J Dermatol Surg Oncol 1994;20:515-21) have been encouraging with the potential of minimal bleeding, ease of placing transplanted grafts, and an overall shortened operative time. A 2-mm slit handpiece has been recently created to expedite this procedure. OBJECTIVE. The purpose of this study is to further investigate the use and efficiency of the new Ultrapulse CO2 laser slit handpiece in hair transplants. METHOD. Mini-slit graft hair transplants using the new Ultrapulse CO2 laser slit handpiece were done on 25 patients in 30 transplant sessions. Donor minigrafts were obtained by the strip harvesting technique using a triple-blade scalpel. Approximately 200-400 recipient slits were made with the 2-mm slit handpiece at the laser setting of 350 mJ, 12 W, 0.8 seconds per pulse. RESULTS. All grafts were easily placed into recipient sites with minimal bleeding and charring. The procedure was done in half the time of the conventional non-laser technique. Postoperatively, patients were quite satisfied with little pain and swelling. Histologic exams of the laser-treated slits showed minimal adjacent tissue necrosis. Long-term follow-up visits showed good regrowth of hair in these grafts. CONCLUSION. The new Ultrapulse CO2 laser slit handpiece proved to be an effective tool for mini-slit graft hair transplantation.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=7496675&dopt=Abstract
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