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columbia sportswear outlet Graves病血&am

 
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PostPosted: Sat 18:41, 19 Mar 2011    Post subject: columbia sportswear outlet Graves病血&am

Graves病血浆β内啡肽检测的临床意义
关。有研究提出体内存在内啡脏应激系统,在紧急情况下该系统发生必奋,在甲亢活动期体内过多的甲状腺激素作用于全身各系统,使机体处于一种高代谢的应激状态。甲医学新知杂志l998年第8巷第3期亢时一般伴有垂体前叶ACTH分泌增多,[link widoczny dla zalogowanych]。而ACTH及B.EP共同来源于一个前体分子P0MC,因此在甲亢时垂体前叶分泌AcTH与EP同时增多。陈龙等报道POMC基因不仅在垂体中表达,[link widoczny dla zalogowanych],许多正常组织中也可检测到其表达,如淋巴细胞可产生ACTH物质;皮下给予CRH可诱导脾脏和淋巴结的淋巴细胞分泌13-EP,[link widoczny dla zalogowanych]。在甲亢活动期由于体内过多的甲状腺激素使周围组织中ACⅢ、B_EP两者水平均有升高。甲亢的发病往往与精神刨伤、过度劳累有关。Ca]abrese等报道在癫痫持续状态时脑脊液中B_EP明显升高,在中枢神经系统损伤后脑脊液和血浆中EP明显升高”,提示EP的升高可能与精神、神经系统异常有关,[link widoczny dla zalogowanych]。可能在甲亢活动期EP的升高与多种因素有关。EP对心血管、内分泌、呼吸、消化、体温和行为活动等具有调节作用,是维持内环境稳定的重要递质。阿片肽与心血管功能有密切的联系。有报道给予静注B_EP,[link widoczny dla zalogowanych],无论剂量大小均引起动物血压降低和心率减慢.Ia-EP浓度的升高,本身对心血管功能有明显抑制作用。在甲亢时13-EP的升高可能对心血管系统起保护作用,对抗体内过多的甲状腺激素造成的伤害。有实验用5.羟色胺拮抗剂抑制B_EP的释放,来提高机体的免疫功能。小剂量地塞米松试验能抑制B.EP的释放,提示pEP与ACTH分泌有相同的负反馈调节机制。因此推论在甲亢活动期EP和ACFt'I的升高与其免疫功能改变有相关性。
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