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Jpn J Pharmacol. 2000 Aug;83(4):335-43.
Ca2+ buffering function of sarcoplasmic reticulum in rat tail arteries: comparison in normotensive and spontaneously hypertensive rats.

Nomura Y, Asano M.

Department of Pharmacology, Nagoya City University Medical School, Nagoya, Japan.

The superficial buffer barrier function of the sarcoplasmic reticulum (SR) during rest and that during stimulation with Bay k 8644, an agonist of L-type Ca2+ channels, were compared in endothelium-denuded strips of tail arteries from 13-week-old normotensive Wistar-Kyoto rats (WKY) and spontaneously hypertensive rats (SHR), by measuring the effects of cyclopiazonic acid (CPA) and thapsigargin that inhibit SR Ca2+-ATPase and the effect of ryanodine that depletes SR Ca2+. The addition of 10 microM CPA induced a transient contraction that was not significantly different between WKY and SHR. The CPA-induced contraction was strongly inhibited by 100 nM nifedipine and was abolished by Ca2+-free solution in both strains. Thapsigargin (100 nM) or ryanodine (10 microM) induced similar, small transient contractions in the two strains. The addition of Bay k 8644 (1-100 nM) almost failed to induce a contraction in both WKY and SHR. When the strips were preincubated with 10 microM CPA, 100 nM thapsigargin or 10 microM ryanodine, Bay k 8644 induced similar concentration-dependent contractions in the two strains. The amount of Ca2+ stored in the SR, as estimated from the 20 mM caffeine-induced contraction, was not significantly different between WKY and SHR. Our results suggest that the SR of rat tail arteries can buffer a large amount of Ca2+ that enters the cell during the rest and the Bay k 8644 stimulation, and these functions are not altered in SHR.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11001180&dopt=Abstract

Rinsho Shinkeigaku. 2000 May;40(5):423-7.
[Malignant hyperthermia of Duchenne muscular dystrophy: application of clinical grading scale and caffeine contracture of skinned muscle fibers]

[Article in Japanese]

Takagi A.

Department of Neurology, Toranomon Hospital.

Episodes of acute myoglobinuria or cardiac arrest were occasionally complicated in general anesthesia of patients with Duchenne or Becker muscular dystrophy (DMD/BMD). Whether these complications are malignant hyperthermia (MH) or not has several times been discussed. In the present study, we applied the clinical grading scale (CGS) of Larach and modified criteria of caffeine contracture test of the skinned fiber (sIVCT) to solve this problem. When the CGS was applied to reported MH-like episodes of DMD/BMD cases, 9 out of 20 cases were classed as almost certain or very likely MH. According to results of sIVCT in 11 patients with DMD/BMD, 5 patients were judged as MHS (MH-susceptible) and 3 as MHE (MH-equivocal). The diagnostic specificity of present MHS criteria was 100% for the fulminant MH. A possible "false positive" result in European IVCT has been discussed in relation to myopathy such as muscular dystrophy. When we applied our sIVCT to the muscle of mdx mouse, caffeine contracture was rather reduced compared to controls. Present study suggested that a true MH was complicated in some cases of DMD/BMD. In certain stage of muscular degeneration, patients with DMD/BMD become susceptible to MH, probably temporarily, but exact mechanism still awaits clarification.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11002722&dopt=Abstract

Theriogenology. 2000 Jul 15;54(2):185-92.
The effect of heparin, caffeine and calcium ionophore A23187 on in vitro induction of the acrosome reaction in frozen-thawed bovine and caprine spermatozoa.

Pereira RJ, Tuli RK, Wallenhorst S, Holtz W.

Institute of Animal Husbandry and Genetics, Goettingen, Germany.

The effect of heparin (5 IU), caffeine (5 mM) and calcium-ionophore A23187 (0.1 mM) on motility and in vitro induction of the acrosome reaction in glass wool filtered frozen-thawed bull and goat semen was studied. The motile spermatozoa fraction was obtained after glass wool filtration of frozen-thawed semen. The seminal plasma was removed from filtered semen by centrifugation, and the sperm pellet was resuspended in Sperm-TALP medium. Samples of treated and untreated control semen of both species were incubated at 37 degrees C. At 1, 15 and 30 min of incubation the proportions of progressively motile and acrosome-reacted spermatozoa were assessed. Trypan blue and Giemsa stain was used to differentiate live and dead spermatozoa having undergone acrosome reaction. Glass wool filtration enhanced the proportion of motile spermatozoa from 43% to 62% in the bovine and from 41% to 60% in the caprine. Whereas the effect of incubation with caffeine, heparin and calcium-ionophore on spermatozoan motility was negligible, the treatment of semen with calcium-ionophore resulted in a significantly improved percentage of live spermatozoa with true acrosome reaction at all stages of incubation, both in the bovine and the caprine.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11003300&dopt=Abstract

Hair loss is a problem in modern soceity. Examining the factors of hair growth may shed light on how hair loss might occur. How long can hair grow before it stops growing eventually if it does? Given that the hair growth rate is quite uniform and constant, somewhere between 0.3-0.5 millimeters per day, it's believed that the length of anagen, the growth phase, differs among individuals, and this is the major determinant to the maximum hair length. For some individuals, anagen may last ten years. Of course the length of the anagen is governed by genes, and the genetic background of the individuals. Non-genetic factors such as nutritional condition, weather, seasonal changes (hair may grow a bit faster during winter), taking medications, health condition may of course influence the rate of hair growth as well as hair loss. The shape of the hair, straight or curly, is dependent on the shape of the follicle. A circular or round hair follicle would generate straight hair, while the follicle with oval or elliptical shapes (in its cross-section) would produce a curly hair.

DHEA is a natural hormone, and it is produced in our body by the adrenal glands. DHEA has been suggested to provide numerous potential benefits. DHEA (or dehydroepiandrosterone) is converted into androgens (male hormones) or estrogens (female hormones) in the cells.

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