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Am J Physiol Cell Physiol. 2000 Oct;279(4):C891-905.
Effects of dihydropyridine receptor II-III loop peptides on Ca(2+) release in skinned skeletal muscle fibers.

Lamb GD, El-Hayek R, Ikemoto N, Stephenson DG.

School of Zoology, La Trobe University, Bundoora, Victoria 3083, Australia. zoogoo.latrobe.edu.au

In skeletal muscle fibers, the intracellular loop between domains II and III of the alpha(1)-subunit of the dihydropyridine receptor (DHPR) may directly activate the adjacent Ca(2+) release channel in the sarcoplasmic reticulum. We examined the effects of synthetic peptide segments of this loop on Ca(2+) release in mechanically skinned skeletal muscle fibers with functional excitation-contraction coupling. In rat fibers at physiological Mg(2+) concentration ([Mg(2+)]; 1 mM), a 20-residue skeletal muscle DHPR peptide [A(S(20)); Thr(671)-Leu(690); 30 microM], shown previously to induce Ca(2+) release in a triad preparation, caused only small spontaneous force responses in approximately 40% of fibers, although it potentiated responses to depolarization and caffeine in all fibers. The COOH-terminal half of A(S(20)) [A(S(10))] induced much larger spontaneous responses but also caused substantial inhibition of Ca(2+) release to both depolarization and caffeine. Both peptides induced or potentiated Ca(2+) release even when the voltage sensors were inactivated, indicating direct action on the Ca(2+) release channels. The corresponding 20-residue cardiac DHPR peptide [A(C(20)); Thr(793)-Ala(812)] was ineffective, but its COOH-terminal half [A(C(10))] had effects similar to A(S(20)). In the presence of lower [Mg(2+)] (0.2 mM), exposure to either A(S(20)) or A(C(10)) (30 microM) induced substantial Ca(2+) release. Peptide C(S) (100 microM), a loop segment reported to inhibit Ca(2+) release in triads, caused partial inhibition of depolarization-induced Ca(2+) release. In toad fibers, each of the A peptides had effects similar to or greater than those in rat fibers. These findings suggest that the A and C regions of the skeletal DHPR II-III loop may have important roles in vivo.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11003569&dopt=Abstract

J Biol Chem. 2003 Jun 20;278(25):22600-8. Epub 2003 Apr 17.
FKBP12 binding to RyR1 modulates excitation-contraction coupling in mouse skeletal myotubes.

Avila G, Lee EH, Perez CF, Allen PD, Dirksen RT.

Department of Biochemistry, Cinvestav-IPN, AP 14-740, Mexico City, DF 07000, Mexico.

The skeletal muscle sarcoplasmic reticulum (SR) Ca2+ release channel or ryanodine receptor (RyR1) binds four molecules of FKBP12, and the interaction of FKBP12 with RyR1 regulates both unitary and coupled gating of the channel. We have characterized the physiologic effects of previously identified mutations in RyR1 that disrupt FKBP12 binding (V2461G and V2461I) on excitation-contraction (EC) coupling and intracellular Ca2+ homeostasis following their expression in skeletal myotubes derived from RyR1-knockout (dyspedic) mice. Wild-type RyR1-, V246I-, and V2461G-expressing myotubes exhibited similar resting Ca2+ levels and maximal responses to caffeine (10 mm) and cyclopiazonic acid (30 microm). However, maximal voltage-gated Ca2+ release in V2461G-expressing myotubes was reduced by approximately 50% compared with that attributable to wild-type RyR1 (deltaF/Fmax = 1.6 +/- 0.2 and 3.1 +/- 0.4, respectively). Dyspedic myotubes expressing the V2461I mutant protein, that binds FKBP12.6 but not FKBP12, exhibited a comparable reduction in voltage-gated SR Ca2+ release (deltaF/Fmax = 1.0 +/- 0.1). However, voltage-gated Ca2+ release in V2461I-expressing myotubes was restored to a normal level (deltaF/Fmax = 2.9 +/- 0.6) following co-expression of FKBP12.6. None of the mutations that disrupted FKBP binding to RyR1 significantly affected RyR1-mediated enhancement of L-type Ca2+ channel activity (retrograde coupling). These data demonstrate that FKBP12 binding to RyR1 enhances the gain of skeletal muscle EC coupling.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12704193&dopt=Abstract

Int J Cancer. 2000 Oct 15;88(2):313-8.
Population based study of coffee, alcohol and tobacco use and risk of ovarian cancer.

Kuper H, Titus-Ernstoff L, Harlow BL, Cramer DW.

Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts, USA.

Coffee, alcohol and tobacco use have been examined in many epidemiologic studies of ovarian cancer but findings have generally been inconclusive. To explain prior inconsistent findings, we sought to determine whether associations with these exposures might vary by histologic subtype of ovarian cancer or menopausal status at diagnosis. We conducted a population-based case-control study in eastern Massachusetts and New Hampshire involving 549 women with newly-diagnosed epithelial ovarian cancer and 516 control women selected either by random digit dialing or through lists of residents. Coffee and alcohol consumption was assessed through a semi-quantitative food-frequency questionnaire, and information on tobacco smoking was collected through personal interview. Consumption of coffee and caffeine was associated with increased risk for ovarian cancer but only among premenopausal women. There was no increase in risk for ovarian cancer overall associated with tobacco or alcohol use in either pre- or post-menopausal women. Association of borderline significance for tobacco and invasive serous cancers and alcohol and mucinous cancers were observed but reduced after adjustment for coffee consumption. We conclude that coffee and caffeine consumption may increase risk for ovarian cancer among premenopausal women and are findings that have some epidemiologic and biologic support. 2000 Wiley-Liss, Inc.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11004686&dopt=Abstract

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