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Jpn J Physiol. 2000 Jun;50(3):329-36.
High pressure sensitizes murine erythroleukemia cells to caffeine-induced premature mitosis.

Matsumoto M, Yamaguchi T, Nakazono K, Fukumaki Y, Terada S.

Department of Chemistry, Faculty of Science, Fukuoka University, Fukuoka, 814-0180, Japan. takeukuoka-u.ac.jp

Murine erythroleukemia (MEL) cells were exposed to a high pressure of 80 MPa or aphidicolin (APH), DNA polymerase inhibitor. The effects of caffeine on cell cycle were examined using these cells. During the culture of 80 MPa-treated MEL cells at atmospheric pressure, the cells arrested in the G2 phase, and cyclin B and hyperphosphorylated p34(cdc2) were accumulated. Namely, maturation promoting factor (MPF) composed of p34(cdc2) and cyclin B was inactive. However, upon exposure to caffeine, these cells entered prematurely into mitosis by activating MPF. Caffeine-induced premature mitosis was suppressed by butyrolactone I and orthovanadate. On the other hand, APH-treated MEL cells, which were not exposed to 80 MPa, were not so sensitive to caffeine-induced premature mitosis despite cyclin B accumulation. In this case, dephosphorylation of p34(cdc2) was not induced by caffeine. Interestingly, caffeine-induced premature mitosis in the 80 MPa-treated cells was also suppressed by APH. These results suggest that the premature mitosis of 80 MPa-treated MEL cells by caffeine is induced by active MPF, and that APH-sensitive molecules such as DNA polymerase may also play an important role in the checkpoint that controls the transition from G2 to M phase.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11016983&dopt=Abstract

J Physiol. 2000 Oct 1;528 Pt 1:25-37.
Effect of intracellular pH on spontaneous Ca2+ sparks in rat ventricular myocytes.

Balnave CD, Vaughan-Jones RD.

University Laboratory of Physiology, University of Oxford, Parks Road, Oxford OX1 3PT, UK.

1. A fall of intracellular pH (pHi) typically depresses cardiac contractility. Among the many mechanisms underlying this depression, an inhibitory effect of acidosis upon the sarcoplasmic reticulum (SR) Ca2+ release channel has been predicted, but not so far demonstrated in the intact cardiac myocyte. In the present work, pHi was manipulated experimentally while confocal imaging was used to record spontaneous 'Ca2+ sparks' (local SR Ca2+ release events) in rat isolated myocytes loaded with the fluorescent Ca2+ indicator fluo-3. In other experiments, whole cell (global) pHi or [Ca2+]i was measured by microfluorimetry (using, respectively, intracellular carboxy SNARF-1 and indo-1). 2. Reducing pHi (i) increased whole cell intracellular [Ca2+] transients induced either electrically or by addition of caffeine, whereas (ii) it decreased spontaneous Ca2+ spark frequency. Conversely, raising pHi increased spontaneous Ca2+ spark frequency. 3. Blocking sarcolemmal Ca2+ influx with 10 mM Ni2+, or reducing external pH by 1.0 unit, had no effect on the pHi-dependent changes in spontaneous Ca2+ spark frequency. 4. Decreasing pHi over the range 7.78-7.20, decreased Ca2+ spark frequency exponentially as a function of pHi, with frequency declining by approximately 33 % for a 0.2 unit fall in pHi. In contrast, over the same pHi range, Ca2+ spark amplitude was unaffected. Intracellular acidosis produced a slight slowing of Ca2+ spark relaxation. 5. The results indicate that, in the intact myocyte, a reduced pHi decreases the probability of opening of the SR Ca2+ release channel. This phenomenon may contribute to the negative inotropic effects of acidosis.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11018103&dopt=Abstract

J Physiol. 2000 Oct 1;528 Pt 1:53-63.
Exogenous Ca2+-ATPase isoform effects on Ca2+ transients of embryonic chicken and neonatal rat cardiac myocytes.

Cavagna M, O'Donnell JM, Sumbilla C, Inesi G, Klein MG.

Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD 21201-1503, USA.

1. Sarco-endoplasmic reticulum Ca2+-ATPase from fast skeletal (SERCA1) or cardiac muscle (SERCA2a) was expressed in embryonic chicken and neonatal rat cardiac myocytes by adenovirus vectors, with c-myc tags on both constructs to compare expression and distinguish exogenous from endogenous SERCA2a in myocytes. 2. Expression of the two isoforms was similar (approximately 3-fold higher than endogenous SERCA). However, SERCA1 activity was 2-fold greater than SERCA2a activity, due to intrinsic differences in turnover rates. Activation of both exogenous SERCA isoforms by Ca2+ was displaced to slightly lower [Ca2+], suggesting that the overexpressed isoforms were independent of phospholamban. In fact, phospholamban and calsequestrin expression were unchanged. 3. Decay time constants of cytosolic Ca2+ transients from cells overexpressing SERCA1 were reduced by 30-40 % and half-widths by 10-15 % compared to controls. SERCA2a overexpression produced much less acceleration of transients in chick than in rat, and less acceleration than SERCA1 overexpression in either species. There was no significant change in resting [Ca2+], peak amplitudes, or in the amount of Ca2+ releasable by caffeine from overexpression of either SERCA isoform. However, the amplitudes of the transients increased with SERCA1 overexpression when pacing frequency limited refilling of the sarcoplasmic reticulum. 4. It is concluded that total SERCA transport velocity has a primary effect on the decay phase of transients. Transport velocity is affected by SERCA isoform turnover rate, temperature, and/or SERCA copy number.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11018105&dopt=Abstract

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