Intrauterine injection and zymography were used to investigate the effect of nitric oxide (NO) on embryo implantation in mice. On day 3, one uterine horn of female pregnant mice was injected intraluminally with variou...Intrauterine injection and zymography were used to investigate the effect of nitric oxide (NO) on embryo implantation in mice. On day 3, one uterine horn of female pregnant mice was injected intraluminally with various doses of nitric oxide synthase (NOS) inhibitor, N-nitro-L-arginine methyl ester (L-NAME), while the contralateral horn served as control. Animals were sacrificed by cervical dislocation on day 7 of gestation, and the number of implanted embryos in each horn was calculated. The results showed that lower doses (0.05mg L-NAME) did not inhibit implantation significantly (P 】 0.05), but high doses (0.2 mg L- NAME) resulted in a significant reduction in the number of implanted embryos (P 【 0.05). Co-administration of SNP, a generator of NO, with L-NAME would reverse the anti-implantation effect of L-NAME. To further understand the precise mechanism of NO in implantation, matrix metallo-proteinase (MMPs) activities were detected by gelatin zymography. The reduction in the number of implanted展开更多
基金This study was supported by the State Major Basic Research Project (Grant No. 1999055903) the Knowledge Innovation Project of the Chinese Academy of Science.
文摘Intrauterine injection and zymography were used to investigate the effect of nitric oxide (NO) on embryo implantation in mice. On day 3, one uterine horn of female pregnant mice was injected intraluminally with various doses of nitric oxide synthase (NOS) inhibitor, N-nitro-L-arginine methyl ester (L-NAME), while the contralateral horn served as control. Animals were sacrificed by cervical dislocation on day 7 of gestation, and the number of implanted embryos in each horn was calculated. The results showed that lower doses (0.05mg L-NAME) did not inhibit implantation significantly (P 】 0.05), but high doses (0.2 mg L- NAME) resulted in a significant reduction in the number of implanted embryos (P 【 0.05). Co-administration of SNP, a generator of NO, with L-NAME would reverse the anti-implantation effect of L-NAME. To further understand the precise mechanism of NO in implantation, matrix metallo-proteinase (MMPs) activities were detected by gelatin zymography. The reduction in the number of implanted
