Linked Life Data

12972180

Source:http://linkedlifedata.com/resource/pubmed/id/12972180

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
2003-9-15
pubmed:abstractText
The present experiment used cultured mouse cumulus cell-enclosed oocytes (CEOs) and denuded oocytes (DOs) to study the function of nitric oxide (NO) in mouse oocyte meiotic maturation. Either positive or negative actions of NO on meiotic maturation has been observed when CEOs or DOs were cultured for 24 h in a medium containing 4 mM hypoxanthine (HX) to maintain meiotic arrest, or in maturation medium (without HX) supplemented with different doses of sodium nitroprusside (SNP, a NO donor), N-omega-nitro-L-arginine methyl ester (L-NAME) or N(w)-nitro-L-arginine (L-NNA) (two inhibitors of NO synthase, NOS), and L-arginine (the only substrate of NOS). Both NOS inhibitors suppressed the formation of first polar body (PB1) of the oocytes in CEOs in a dose dependent manner, but no effect on germinal vesicle break down (GVBD) was observed. An optimal inhibitory effect was observed with either 10(-3) M L-NAME (P<0.01) or 10(-3) M L-NNA (P<0.01) and the inhibition could be reversed by the addition of SNP (10(-5) M). The above mentioned optimal concentration of L-NAME or L-NNA on CEOs exhibited no effect on oocyte meiotic maturation of DOs. Treatments of low concentrations of SNP (10(-7), 10(-6), 10(-5) M) stimulated significantly the oocyte meiotic maturation of CEOs which were inhibited with HX, but had no effect on DOs in the same culture medium. While, the treatment with high concentrations of SNP (0.1-4 mM) during the CEOs cultured in maturation medium resulted in a lower percentage of oocytes at PB1 stage and a higher percentage of atypical oocytes in a dose dependent manner compared with control. A dose of SNP at 1 mM exhibited significant inhibitory effect on the formation of PB1, but without effect on the number of atypical oocytes compared with control, while, this SNP dosage not only inhibited the oocyte PB1 formation but also increased the percentage of dead oocytes in DOs. Although oocytes of all groups underwent GVBD at the end of the culture in the spontaneous maturation medium, the results of the kinetics showed that the treatment of the optimal concentration of SNP (1 mM) could significantly delay GVBD during the first 5 h culture period. The concomitant addition of L-NAME with SNP did not reverse the inhibitory effect of SNP on CEOs. Similarly, neither pre-incubation nor illumination by ultraviolet ray could balance the inhibitory effect of SNP. Finally, when added alone at a concentration of 4 mM, L-arg caused extensive death of both CEOs and DOs. While, administration of 4 mM L-arg and 1 mM L-NAME to both CEOs and DOs simultaneously resulted in markedly reduced CEOs death percentage as compared with L-arg treatment alone, but not in DOs. These data support the idea that NO could act with a dual action (stimulation or inhibition) in mouse meiotic maturation depending on its concentration.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0303-7207
pubmed:author
pubmed:issnType
Print
pubmed:day
30
pubmed:volume
207
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
21-30
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed-meshheading:12972180-Animals, pubmed-meshheading:12972180-Arginine, pubmed-meshheading:12972180-Cell Aggregation, pubmed-meshheading:12972180-Cell Culture Techniques, pubmed-meshheading:12972180-Dose-Response Relationship, Drug, pubmed-meshheading:12972180-Enzyme Inhibitors, pubmed-meshheading:12972180-Female, pubmed-meshheading:12972180-Granulosa Cells, pubmed-meshheading:12972180-Hypoxanthine, pubmed-meshheading:12972180-Meiosis, pubmed-meshheading:12972180-Mice, pubmed-meshheading:12972180-NG-Nitroarginine Methyl Ester, pubmed-meshheading:12972180-Nitric Oxide, pubmed-meshheading:12972180-Nitric Oxide Donors, pubmed-meshheading:12972180-Nitric Oxide Synthase, pubmed-meshheading:12972180-Nitroprusside, pubmed-meshheading:12972180-Nitroso Compounds, pubmed-meshheading:12972180-Oocytes
pubmed:year
2003
pubmed:articleTitle
Dual effects of nitric oxide on meiotic maturation of mouse cumulus cell-enclosed oocytes in vitro.
pubmed:affiliation
College of Biological Sciences, China Agricultural University, Beijing, 100094, PR China.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't