The effects of increasing NO generated by S-nitroso-N-acetylpenicillamine (SNAP; 10(-7)-10(-3)

mol/L) and of other drugs that may affect the NO/cGMP pathway (proptoporfirin IX and 8-Br-cGMP) on meiosis resumption were investigated in bovine cumulus-oocyte complexes (COCs) matured for 9 Selleck SN-38 hours in a semidefined medium (TCM199 + 3 mg/mL BSA). The COCs matured with 10(-7) mol/L SNAP associated or not with 100 mu mol/L oxadiazole-one quinoxaline, a guanylate cyclase inhibitor, also had their cGMP and CAMP levels measured during the first hours of maturation (1, 3, and 6 hours). Quantitative polymerase chain reaction was performed by real-time polymerase chain reaction to determine the effects of NO on expression of genes encoding for enzymes of the NO/guanylate cyclase/cGMP and CAMP pathways CSF-1R inhibitor during the first 9 hours of oocyte maturation. Increasing NO levels using 10(-7) mol/L SNAP resulted in lower rate of germinal vesicle breakdown (36% germinal vesicle breakdown; P smaller

than 0.05) at 9 hours IVM, whereas control group and the treatments with 10(-9) and 10(-8) mol/L SNAP showed about 70% germinal vesicle breakdown (P bigger than 0.05). A temporary increase in cGMP levels was also observed with the same treatment (4.51 pmol/COC) at 1 hour IVM, which was superior to the control group (2.97 pmol/COC; P smaller than 0.05) and was reversed by inhibiting guanylate cyclase activity with 100 mu mol/L oxadiazole-one quinoxaline. Neither cAMP levels nor gene expression were affected by NO. These results suggest that NO acts via guanylate cyclase/cGMP and that even a temporary increase in cGMP levels leads to a delay in meiosis resumption, even when cAMP levels have declined. Nitric oxide does not act on oocyte maturation by affecting cAMP GSK2126458 in vivo levels or the expression of genes related to the NO/guanylate cyclase/cGMP and cAMP pathways. Also, to our knowledge this is the first report to detect PKG1, PKG2, phosphodiesterase-5A,

ADCY3, ADCY6, and ADCY9 transcripts in bovine oocytes. (C) 2014 Elsevier Inc. All rights reserved.”
“Vascular complications, including vessel occlusion and hemorrhage, can arise after radiosurgery; however, hemorrhage due to a ruptured de novo aneurysm after Gamma Knife radiosurgery (GKS) for tumor is extremely rare. To the authors’ knowledge, only a single case of de novo aneurysm formation after GKS for vestibular schwannoma has been previously reported. In this study, they describe their experience with the treatment of a 74-year-old woman with subarachnoid hemorrhage limited to the cerebellopontine cistern, who had undergone GKS for vestibular schwannoma 5 years earlier. Cerebral angiography demonstrated a left distal anterior inferior cerebellar artery aneurysm; coil embolization was attempted and failed. However. self-resolution of the aneurysm was revealed on follow-up angiography. (DOI: 10.3171/2008.9.