DIRECT EFFECTS OF COCAINE ON THE PREGNANT HUMAN UTERUS

怀孕期间使用可卡因是一种严重的健康危害，与 早产率约为25%。不幸的是，我们知之甚少。 关于可卡因如何增强子宫收缩能力从而导致 早产。这项调查的目的是确定 可卡因对怀孕的人子宫有直接影响，使其增加 收缩能力，并确定可卡因的细胞机制 效果。这项研究将集中在两个方面：第一， 确定可卡因是否能显著增强对不同类型的 激动剂(儿茶酚胺、前列腺素和催产素)，子宫条 孕妇将在体外使用肌肉浴收缩进行评估。 仪器。使用已知的产酵解剂和其他探针(α-和 β-肾上腺素能受体激动剂和拮抗剂，前列腺素抑制剂， 钙通道阻滞剂，硫酸镁)，特定的收缩 系统(S)受到可卡因的影响，以及阻止这些最有效的方法 影响将会被确定。慢性可卡因效应将通过以下方式进行评估 检查服用可卡因的孕妇的子宫条 她们的怀孕。第二个集中领域将是评估 可卡因作用的细胞机制的切片、肉末和 子宫内膜和子宫肌层的膜准备。可卡因的能力 ALTER摄取和失活将通过测量细胞内 细胞暴露后儿茶酚胺和代谢物的水平 放射性标记的儿茶酚胺。可卡因对α-肾上腺素受体的影响 相互作用将通过受体结合研究以及 激动剂诱导前列腺素和三磷酸肌醇的产生。 可卡因对β-肾上腺素能受体功能的急性和慢性影响 浓度将通过受体结合研究和环磷酸腺苷进行评估 化验。因此，这项研究将调查可卡因的直接影响 增强妊娠期人子宫收缩功能及其机制 这些影响。这些信息将有助于澄清这一关系 可卡因使用和早产之间的关系，并提供一种合理的方法 可卡因相关早产的治疗。

Cocaine use in pregnancy is a serious health hazard associated with a premature labor rate of approximately 25%. Unfortunately, little is known about how cocaine might augment uterine contractility and thus cause premature labor. The objectives of this investigation are to determine if cocaine has direct effects on the pregnant human uterus which increase contractility, and to identify the cellular mechanisms of cocaine's effects. The study will have two areas of concentration: First, to determine if cocaine acutely augments the contractile response to various agonists (catecholamines, prostaglandins and oxytocin), uterine strips from pregnant women will be evaluated in vitro using a muscle bath contraction apparatus. Using known tocolytic agents and other probes (alpha- and beta-adrenoceptor agonists and antagonists, prostaglandin inhibitors, calcium-channel blockers, magnesium sulfate), the specific contractile system(s) affected by cocaine, and the most effective way to block these effects will be identified. Chronic cocaine effects will be evaluated by examining uterine strips from pregnant humans who have taken cocaine during their pregnancy. The second area of concentration will be evaluation of the cellular mechanisms of cocaine's effects using slices, minces and membrane preparations of endometrium and myometrium. Cocaine's ability to alter uptake and deactivation will be evaluated by measuring intracellular levels of catecholamines and metabolites after exposure of cells to radiolabeled catecholamines. Cocaine's effect on alpha-adrenoceptors interactions will be evaluated by receptor binding studies, as well as agonist-induced production of prostaglandins and inositol trisphosphate. The acute and chronic effects of cocaine on beta-adrenoceptor function and concentration will be evaluated by receptor binding studies and cyclic AMP assay. Thus, this study will investigate the direct effects of cocaine that increase contractility of the pregnant human uterus and the mechanisms of these effects. This information will help clarify the relationship between cocaine use and premature labor, and provide a rational approach to the treatment of cocaine-associated premature labor.