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Effect of sodium nitroprusside, a nitric oxide donor, on the in vitro maturation of bovine oocytes. 2007

K S Viana, and M C Caldas-Bussiere, and S G C Matta, and M R Faes, and C S Paes de Carvalho, and C R Quirino
Laboratório de Reprodução e Melhoramento Genético Animal, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes 28013-602, RJ, Brazil.

Nitric oxide (NO) is a highly reactive free radical involved in intra- and intercellular signaling in various stages of reproduction. The objective of the present study was to evaluate the effect of the addition of sodium nitroprusside (SNP), a NO donor, on nuclear and cytoplasmic in vitro maturation of bovine oocytes. Analysis of variance was conducted and the means were compared by t test at a level of 5%. Low (10(-7) and 10(-9)M) and intermediate (10(-5)M) concentrations of SNP had no significant effect on nuclear maturation, however, when a greater concentration of SNP (10(-3)M) was added, oocytes remained in metaphase I (MI) after 24 h culture (P<0.05) and did not show cumulus expansion. To evaluate if this effect was reversible and if a retardation or inhibition had occurred in the progression from MI to MII, oocytes were cultured in presence of 10(-3)M of SNP for 24 h followed by culture for an additional 24 h in medium with or without SNP. After 48 h, the oocytes remained in MI even when the medium was changed at 24 h with or without SNP. The kinetics of nuclear maturation was assessed to evaluate if there had been or not a retardation in the progression of meiosis with the concentration of 10(-3)M SNP. This concentration delayed germinal vesicle breakdown (VGBD) at 8 h of culture (P<0.05), and at 12 h there was no significant difference between the control and the treated group. The concentrations that did not induce alterations in nuclear maturation were evaluated for cytoplasmic maturation. The concentration of 10(-5)M improved the percentage of peripheral cortical granules (P<0.05), and significantly increased the percentage of blastocysts. These results demonstrate that SNP at greater concentrations (10(-3)M) has a cytotoxic effect, but at intermediate (10(-5)M) concentrations it increases blastocyst rates. NO exhibits a dual effect on bovine oocytes, inhibits (10(-3)M of SNP) nuclear and cytoplasmic maturation or stimulates (10(-5)M of SNP) cytoplasmic maturation, depending on concentration in the culture medium.

UI MeSH Term Description Entries
D008540 Meiosis A type of CELL NUCLEUS division, occurring during maturation of the GERM CELLS. Two successive cell nucleus divisions following a single chromosome duplication (S PHASE) result in daughter cells with half the number of CHROMOSOMES as the parent cells. M Phase, Meiotic,Meiotic M Phase,M Phases, Meiotic,Meioses,Meiotic M Phases,Phase, Meiotic M,Phases, Meiotic M
D009599 Nitroprusside A powerful vasodilator used in emergencies to lower blood pressure or to improve cardiac function. It is also an indicator for free sulfhydryl groups in proteins. Nitroferricyanide,Sodium Nitroprusside,Cyanonitrosylferrate,Ketostix,Naniprus,Nipride,Nipruton,Nitriate,Nitropress,Nitroprussiat Fides,Nitroprusside, Disodium Salt,Nitroprusside, Disodium Salt, Dihydrate,Disodium Salt Nitroprusside,Nitroprusside, Sodium
D009865 Oocytes Female germ cells derived from OOGONIA and termed OOCYTES when they enter MEIOSIS. The primary oocytes begin meiosis but are arrested at the diplotene state until OVULATION at PUBERTY to give rise to haploid secondary oocytes or ova (OVUM). Ovocytes,Oocyte,Ovocyte
D001755 Blastocyst A post-MORULA preimplantation mammalian embryo that develops from a 32-cell stage into a fluid-filled hollow ball of over a hundred cells. A blastocyst has two distinctive tissues. The outer layer of trophoblasts gives rise to extra-embryonic tissues. The inner cell mass gives rise to the embryonic disc and eventual embryo proper. Embryo, Preimplantation,Blastocysts,Embryos, Preimplantation,Preimplantation Embryo,Preimplantation Embryos
D002417 Cattle Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor. Beef Cow,Bos grunniens,Bos indicus,Bos indicus Cattle,Bos taurus,Cow,Cow, Domestic,Dairy Cow,Holstein Cow,Indicine Cattle,Taurine Cattle,Taurus Cattle,Yak,Zebu,Beef Cows,Bos indicus Cattles,Cattle, Bos indicus,Cattle, Indicine,Cattle, Taurine,Cattle, Taurus,Cattles, Bos indicus,Cattles, Indicine,Cattles, Taurine,Cattles, Taurus,Cow, Beef,Cow, Dairy,Cow, Holstein,Cows,Dairy Cows,Domestic Cow,Domestic Cows,Indicine Cattles,Taurine Cattles,Taurus Cattles,Yaks,Zebus
D002467 Cell Nucleus Within a eukaryotic cell, a membrane-limited body which contains chromosomes and one or more nucleoli (CELL NUCLEOLUS). The nuclear membrane consists of a double unit-type membrane which is perforated by a number of pores; the outermost membrane is continuous with the ENDOPLASMIC RETICULUM. A cell may contain more than one nucleus. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed) Cell Nuclei,Nuclei, Cell,Nucleus, Cell
D002478 Cells, Cultured Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others. Cultured Cells,Cell, Cultured,Cultured Cell
D003593 Cytoplasm The part of a cell that contains the CYTOSOL and small structures excluding the CELL NUCLEUS; MITOCHONDRIA; and large VACUOLES. (Glick, Glossary of Biochemistry and Molecular Biology, 1990) Protoplasm,Cytoplasms,Protoplasms
D004305 Dose-Response Relationship, Drug The relationship between the dose of an administered drug and the response of the organism to the drug. Dose Response Relationship, Drug,Dose-Response Relationships, Drug,Drug Dose-Response Relationship,Drug Dose-Response Relationships,Relationship, Drug Dose-Response,Relationships, Drug Dose-Response
D005260 Female Females

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