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Titolo:
AGING-RELATED CHANGES IN CALCIUM OSCILLATIONS IN FERTILIZED MOUSE OOCYTES
Autore:
IGARASHI H; TAKAHASHI E; HIROI M; DOI K;
Indirizzi:
YAMAGATA UNIV,SCH MED,DEPT PHYSIOL YAMAGATA 99023 JAPAN YAMAGATA UNIV,SCH MED,DEPT PHYSIOL YAMAGATA 99023 JAPAN YAMAGATA UNIV,SCH MED,DEPT OBSTET & GYNECOL YAMAGATA 99023 JAPAN
Titolo Testata:
Molecular reproduction and development
fascicolo: 3, volume: 48, anno: 1997,
pagine: 383 - 390
SICI:
1040-452X(1997)48:3<383:ACICOI>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
GOLDEN-HAMSTER EGGS; CA2+ RELEASE; SARCOPLASMIC-RETICULUM; ENDOPLASMIC-RETICULUM; INTRACELLULAR CALCIUM; RABBIT OOCYTES; MAMMALIAN EGGS; SPERM; MEMBRANE; RECEPTOR;
Keywords:
INTRACELLULAR CALCIUM REGULATION; ENDOPLASMIC RETICULUM; CAGED CALCIUM; CALCIUM PUMP;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
41
Recensione:
Indirizzi per estratti:
Citazione:
H. Igarashi et al., "AGING-RELATED CHANGES IN CALCIUM OSCILLATIONS IN FERTILIZED MOUSE OOCYTES", Molecular reproduction and development, 48(3), 1997, pp. 383-390

Abstract

Aging of oocytes, being not fertilized after ovulation for a prolonged time, considerably affects normal development of the fertilized oocyte. We examined effects of the aging on a series of highly repetitive Ca2+ transients commonly seen in fertilized mouse oocytes (Ca2+ oscillations). Frequency of Ca2+ oscillations in the aged oocyte [20 hrs after induction of superovulation by i.p. human chorionic gonadotropin (hCG)] was significantly higher (34.1 +/- 5.8 1/hr) than the fresh oocyte (14 hr post-hCG, 21.8 +/- 7.9 1/hr). Rates of rise and fall of individual Ca2+ transient in the aged oocyte were significantly slower thanthe fresh oocyte, whereas durations of individual Ca2+ transients were similar. When extracellular Ca2+ was raised from 2.04 mM to 5.00 mM,aged oocytes showed significant prolongation of the duration of individual Ca2+ transient, that resulted in a sustained elevation of intracellular Ca2+ ([Ca2+](i)) in 33% of the aged oocyte. Transient increasein [Ca2+](i) by photolysis of a caged Ca2+, Nitr-5, injected into cytoplasm was completely restored in the fresh oocyte [fluorescence intensity of [Ca2+](i) indicator dye Fluo-3 (F-480) returned to 97 +/- 2% of the control level, time constant = 37 +/- 9 sec]. In contrast, in the aged oocyte, restoration of F-480 following Nitr-5 photolysis was incomplete (115 +/- 12% of the control) and slow (time constant = 64 +/-23 sec). Because inhibition of the Ca2+ pump of the endoplasmic reticulum (ER) by 5 mu M thapsigargin almost completely inhibited restoration of F-480 following Nitr-5 photolysis in the fresh oocyte, we conclude that the aging-related changes in Ca2+ oscillations may be accounted for by dysfunction of intracellular Ca2+ regulation, presumably of the Ca2+ pump of the ER. (C) 1997 Wiley-Liss, Inc.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/21 alle ore 10:51:43