首页 > 文献资料
-
水通道蛋白1生理功能的研究进展
水是生命之源,在活细胞中水的比例约占总质量的70%.大多数细胞的生化反应都是在水环境中进行的,而细胞内外水平衡的稳定是维持生命的关键因素之一.研究显示,水分子跨细胞膜快速转运是通过细胞膜上的一种水通道蛋白(aquaporin,AQP)实现的.
-
水通道蛋白3功能的研究动态
水通道蛋白(aquaporin protein,AQP)是一种内在膜蛋白,除可以通透水以外,还可以通透一些小分子蛋白,如甘油,尿素等.AQP3是AQP家族成员之一,是第1个被发现的除了对水有通透性以外,还能够通透甘油和尿素的AQP.由于它对甘油转运的功能,初也叫甘油内在蛋白.
-
地塞米松对支气管哮喘大鼠气道组织中水通道蛋白4表达的影响
水通道蛋白(aquaporin,AQP)是一组与水通透性有关的细胞膜转运蛋白,分布于肺组织的水通道蛋白有6种[1],参与气道湿化、腺体分泌、水肿形成和重吸收等.支气管哮喘(简称哮喘)常伴支气管黏液分泌亢进,腺体功能的异常.AQP4是否通过影响气道黏膜上皮细胞功能、腺体分泌从而参与哮喘的发病过程,目前国内外尚少见报道.本研究探讨哮喘大鼠AQP4的表达及地塞米松干预后的改变,进一步阐明哮喘的发病机制.
-
Melatonin has been shown to diminish edema in rats. Melatonin can be used to treat spinal cord injury. This study presumed that melatonin could relieve spinal cord edema and examined how it might act. Our experiments found that melatonin (100 mg/kg, i.p.) could reduce the water content of the spinal cord, and suppress the expression of aquaporin-4 and glial ifbrillary acidic protein after spinal cord injury. This suggests that the mechanism by which melatonin alleviates the damage to the spinal cord by edema might be related to the expression of aquaporin-4 and glial ifbrillary acidic protein.
-
水通道蛋白与肺水肿的研究进展
水的跨细胞膜转运感受渗透浓度的变化.肺组织内血气屏障的存在保证了肺内气体交换、肺内液体平衡及循环代谢,以维持肺组织内环境的稳定.当由于各种原因造成肺水屏障受损,肺内液体产生过多,如胸膜渗出、心衰等,由渗透压力改变所驱动的水的快速清除变成了预防肺水肿发生的重要措施.1988年Agre发现了整合膜蛋白28 (CH IP28)后命名为水通道蛋白1 (Aquaporin 1,AQP1),此后逐渐发现了 12种水通道蛋白.AQPs是一组与水通透性有关的细胞膜转运蛋白,它的发现在分子水平揭示了水跨膜转运调节的基本机制.各种肺损伤常伴有肺水肿的发生,而肺水肿以肺泡和肺间质内液体积聚为特点,发生时必然伴有水转运紊乱及AQPs质或量的改变,因此充分认识水通道蛋白与肺水肿的关系对临床治疗肺损伤具有重要意义.
-
Background: Determining the expression and functions of aquaporins (AQPs) in the adult kidney has generated important information about the roles of this protein family in the renal regulation of water homeostasis. However, limited information describes the expression of AQPs in fetal kidneys, and most reports on fetal renal AQPs originate from animal studies. Although there are the maturation and regulation of the renalconcentrating mechanism, the ways in which changes in the expression of AQPs contribute to the formation of urine during the perinatal period remain unclear.
Data sources: This review summarizes current knowledge about the spatial and temporal expression patterns of AQP1, AQP2, AQP3, and AQP4 in the fetal and postnatal kidneys in different animal species and in human beings.
Results: AQP1 and AQP2 expression can be detected earlier in gestation in human beings and sheep compared with mice and rats. AQP1 expression is detected earlier in the proximal tubules than the expression of AQP2, AQP3, and AQP4 in the collecting ducts.
Conclusion: Further studies investigating the regulation of AQPs during kidney development may provide insights into normal water-handling mechanisms and the pathophysiology of fetal kidneys, which may determine new directions for the clinical treatment of kidney diseases.