Expression of Inositol 1,4,5-trisphosphate Receptor mRNA in Myocardium of Spontaneous Hypertension Rats and Cultured Vascular Smooth Muscle Cells of Rats

Objective\ To investigate expression of inositol 1,4,5 trisphosphate receptor (IP\-3R) mRNA on sacroplasmic reticular in myocardium of spontaneous hypertension rats (SHRs) and cultured vascular smooth muscle cells (VSMC) of rats and effects of perindopril and urapidil on them. Methods\ SHRs were orally given perindopril (1.0 mg·kg\+\{ 1\}·d\+\{ 1\}) or urapidil (15 mg·kg\+\{ 1\}·d\+\{ 1\}) for 24 weeks, respectively. Expression of IP\-3R mRNA was examined by semi quantitative reverse transcription polymers chain reaction (RT PCR) using three oligonuclotide primers for each subtype of IP\-3R with β actin as internal label. Results\ All subtypes of IP\-3R were expressed in myocardium of SHR, WKY and cultured VSMC. Expression of IP\-3R mRNA in left ventricle of SHR was markedly enhanced. Urapidil could down regulate expression of IP\-3R Ⅰand IP\-3R Ⅲ, perindopril slightly increased expression of IP\-3R Ⅱ and decreased expression of IP\-3R Ⅰand IP\-3R Ⅲ in myocardium of SHR. Conclusion\ Our results suggest that expression of IP\-3R mRNA in cardiovascular system could be regulated by urapidil and perindopril.

Inositol 1,4,5-trisphosphate receptor in the liver:Expression and function

The liver is a complex organ that performs several functions to maintain homeostasis.These functions are modulated by calcium,a second messenger that regulates several intracellular events.In hepatocytes and cholangiocytes,which are the epithelial cell types in the liver,inositol 1,4,5-trisphosphate(InsP3)receptors(ITPR)are the only intracellular calcium release channels.Three isoforms of the ITPR have been described,named type 1,type 2 and type 3.These ITPR isoforms are differentially expressed in liver cells where they regulate distinct physiological functions.Changes in the expression level of these receptors correlate with several liver diseases and hepatic dysfunctions.In this review,we highlight how the expression level,modulation,and localization of ITPR isoforms in hepatocytes and cholangiocytes play a role in hepatic homeostasis and liver pathology.

High expression of type I inositol 1,4,5-trisphosphate receptor in the kidney of rats with hepatorenal syndrome

AIM To detect the expression of typeⅠ inositol 1,4,5-trisphosphate receptor(IP3 RI) in the kidney of rats with hepatorenal syndrome(HRS).METHODS One hundred and twenty-five Sprague-Dawley rats were randomly divided into four groups to receive an intravenous injection of D-galactosamine(D-Gal N) plus lipopolysaccharide(LPS; group G/L, n = 50), D-Gal N alone(group G, n = 25), LPS alone(group L, n = 25), and normal saline(group NS, n = 25), respectively.At 3, 6, 9, 12, and 24 h after injection, blood, liver, and kidney samples were collected. Hematoxylineosin staining of liver tissue was performed to assess hepatocyte necrosis. Electron microscopy was used to observe ultrastructural changes in the kidney. Western blot analysis and real-time PCR were performed to detect the expression of IP3 RI protein and m RNA in the kidney, respectively.RESULTS Hepatocyte necrosis was aggravated gradually, which was most significant at 12 h after treatment with D-galactosamine/lipopolysaccharide, and was characterized by massive hepatocyte necrosis. At the same time, serum levels of biochemical indicators including liver and kidney function indexes were all significantly changed. The structure of the renal glomerulus and tubules was normal at all time points. Western blot analysis indicated that IP3 RI protein expression began to rise at 3 h(P < 0.05) and peaked at 12 h(P < 0.01). Real-time PCR demonstrated that IP3 RI m RNA expression began to rise at 3 h(P < 0.05) and peaked at 9 h(P < 0.01).CONCLUSION IP3 RI protein expression is increased in the kidney of HRS rats, and may be regulated at the transcriptional level.

1,4,5-三磷酸肌醇受体及其在休克中的作用

1,4,5-三磷酸肌醇(IP3)受体(IP3R)是内质网释放钙离子(Ca2+)的主要通道之一,在维持细胞内钙稳态方面发挥着重要作用。休克作为一种严重的、发生器官功能障碍与结构损伤的病理过程,钙稳态失调是其重要的中间环节。鉴于IP3R功能或表达异常引起钙稳态失调参与了多种病理过程的发生、进展,本文对IP3R结构与调节的研究进展进行综述,总结IP3R在失血性休克、感染性休克中的作用,期望以IP3R为切入点,为防治重症休克提供理论基础,并探索靶向IP3R防治休克的新策略。

Altered expression of stromal interaction molecule(STIM)-calcium release-activated calcium channel protein(ORAI) and inositol1,4,5-trisphosphate receptors(IP_3Rs)in cancer:will they become a new battlefield for oncotherapy?

The stromal interaction molecule(STIM)-calcium release-activated calcium channel protein(ORAI) and inositol1,4,5-trisphosphate receptors(IP_3Rs) play pivotal roles in the modulation of Ca^(2+)-regulated pathways from gene transcription to cell apoptosis by driving calcium-dependent signaling processes.Increasing evidence has implicated the dysregulation of STIM-ORAI and IP_3Rs in tumorigenesis and tumor progression.By controlling the activities,structure,and/or expression levels of these Ca^(2+)-transporting proteins,malignant cancer cells can hijack them to drive essential biological functions for tumor development.However,the molecular mechanisms underlying the participation of STIM-ORAI and IP_3Rs in the biological behavior of cancer remain elusive.In this review,we summarize recent advances regarding STIM-ORAI and IP_3Rs and discuss how they promote cell proliferation,apoptosis evasion,and cell migration through temporal and spatial rearrangements in certain types of malignant cells.An understanding of the essential roles of STIM-ORAI and IP_3Rs may provide new pharmacologic targets that achieve a better therapeutic effect by inhibiting their actions in key intracellular signaling pathways.

1,4,5-三磷酸肌醇受体与神经变性疾病

1,4,5-三磷酸肌醇受体(inositol 1,4,5-trisphosphate receptors,IP3Rs)是细胞内质网上的钙离子(cal⁃cium ion,Ca^(2+))通道,通过调控Ca^(2+)参与细胞生物学功能,是维持中枢神经系统正常功能的关键分子。近年来,越来越多的研究发现,IP3Rs结构和功能异常与神经变性疾病如阿尔茨海默病、帕金森病、亨廷顿病、脊髓小脑共济失调等的发病机制密切相关,这些结构和功能异常如何影响IP3Rs功能,及相关钙信号,并且如何在这些疾病的发病和严重程度中发挥作用,仍尚不清楚。IP3Rs如何在神经变性疾病中发挥作用将于本文中进行综述。

内质网蛋白44(ERp44)通过1,4,5-三磷酸肌醇受体介导基因转录(英文)

细胞核内钙离子浓度的增加可以引起包括钙离子激活的基因转录在内的很多生理功能.运用Western blot、免疫荧光、实时定量聚合酶链反应、钙成像以及外源三磷酸腺苷刺激细胞释放钙离子等试验方法,发现1,4,5-三磷酸肌醇受体和内质网蛋白44(ERp44)在内质网和核膜上都有很好的共定位.外源三磷酸腺苷可以通过1,4,5-三磷酸肌醇受体刺激核内钙瞬变并磷酸化环磷酸腺苷反应原件结合蛋白(CREB)、刺激原癌基因c-Myc的表达.但是,这些功能都能被1,4,5-三磷酸肌醇受体抑制剂2-氨乙氧基二苯酯硼酸(2-APB)和过表达内质网蛋白44(ERp44)所抑制.这些结果均提示在子宫颈癌HeLa细胞中内质网蛋白44(ERp44)通过1,4,5-三磷酸肌醇受体而介导基因转录.

大鼠心肌缺血再灌注时心肌细胞核1,4,5三磷酸肌醇受体结合特性改变的研究

目的观察大鼠心肌缺血再灌注时心肌细胞核1,4,5三磷酸肌醇受体(IP3R)的结合特性改变,进一步探索心肌缺血再灌注时细胞凋亡的病理机制。方法TUNEL技术检测心肌细胞核凋亡率。蔗糖密度梯度离心法提纯心肌细胞核,放射配体分析法检测心肌细胞核膜上IP3R的结合特性变化。结果①缺血再灌注损伤(IRI)组大鼠心肌细胞凋亡率高于对照组(P<0.01)。②大鼠心肌缺血再灌注损伤时,心肌细胞核IP3R的最大结合容量Bmax较假手术组增加2.6倍;而其亲和力Kd值无明显变化。③IRI组心肌细胞核IP3R经激活的PKC磷酸化后结合特性增强1.54倍,对照组核IP3R经PKC磷酸化后结合特性无明显改变。④[Ca2+]对IRI组及假手术组心肌细胞核IP3R的调节均呈双相性,胞浆钙超载状态下([Ca2+]为5μmol·L-1时)较正常胞浆钙浓度下([Ca2+]为100nmol·L-1时),两组核IP3R结合特性均增强,[Ca2+]为100μmol·L-1时,两组核IP3R结合特性降低。结论大鼠心肌心肌缺血再灌注损伤病理情况下心肌细胞核IP3R结合特性增强,致核内钙浓度([Ca2+]n)增高,这可能是心肌缺血再灌注损伤中心肌细胞凋亡的主要病理机制之一。

Temperature-dependence and conformational basis of inositol 1,4,5-trisphosphate receptor regulated by Ca^(2+)

The inositol 1,4,5-trisphosphate (lnsP3) receptor was purified from bovine cerebellum and reconstituted in liposomes composed of phosphatidylcholine (PC) and phosphatidylethanola-mine (PE) (1:1) successfully. No effect of Ca2+ concentration on [3H]-lnsP3 binding to unreconsti-tuted lnsP3 receptor could be observed either at 4℃ or at 25℃, whereas the effect of [Ca2+] on reconstituted lnsP3 receptor depended on the temperature. The Ca2+ concentration outside the proteolipsome ([Ca2+]o) had no detectable effect on lnsP3 binding to lnsP3 receptor at 4℃. In contrast, with increase of [Ca2+]o from 0 to 100 nmol/L at 25℃, the lnsP3 binding activity increased gradually. Then the lnsP3 binding activity was decreased drastically at higher [Ca2+]0 and inhibited entirely at 50 nmol/L [Ca2+]. Conformational studies on intrinsic fluorescence of the reconstituted lnsP3 receptor and its quenching by Kl and HB indicated that the global conformation of reconstituted lnsP3 receptor could not be affected by [Ca2+]o at 4℃. While at 25℃, the effects of 10μmol/L [Ca2+]0 on global, membrane and cytoplasmic conformation of the reconstituted lnsP3 receptor were different significantly from that of 100 nmol/L [Ca2+]0.

肿瘤坏死因子-α增强肝肾综合征时肾脏I型1,4,5-三磷酸肌醇受体表达

目的:通过观察TNF-α对肾组织中Ⅰ型IP3R表达的影响来探讨肝肾综合征的发病机制.方法:制备大鼠离体肾灌注模型,随机分成对照组(A组)、肝素处理组(B组)、TNF-α处理组(C组),留取的标本应用免疫组织化学技术、Westernblot及实时定量PCR检测肾组织Ⅰ型IP3R蛋白的定位、表达及mRNA的变化.结果:Ⅰ型IP3R主要分布于肾小球系膜细胞和血管平滑肌细胞的胞质内.免疫组化结果显示,C组与A组相比棕褐色颗粒着色的阳性细胞明显增多,有显著性差异(U=2.26,P<0.05);B组与A组相比阳性染色细胞无明显减少(P>0.05);Western blot结果与免疫组织化学结果相一致:C组与A组相比Ⅰ型IP3R蛋白表达水平明显增高,有显著性差异(1.89±0.11vs0.55±0.03,P<0.05);B组与A组相比无显著性差异(P>0.05);实时定量PCR结果显示:C组与A组相比Ⅰ型IP3R mRNA的表达水平明显增高,有显著性差异(7.99±0.12vs1.00±0.05,P<0.05);B组与A组相比无显著性差异(P>0.05).结论:TNF-α可增强肾小球系膜细胞和血管平滑肌细胞Ⅰ型IP3R蛋白的表达,且Ⅰ型IP3R mRNA也呈增加趋势.

TNF-α增强主动脉平滑肌细胞内1型1,4,5-三磷酸肌醇受体表达参与感染性休克的发生机制

目的研究TNF-α对主动脉平滑肌细胞(VSMC)内1型1,4,5-三磷酸肌醇受体(IP3RⅠ)表达的影响,揭示TNF-α影响VSMC收缩功能参与感染性休克的发生机制。方法原代分离培养大鼠VSMC。按TNF-α处理的不同时间点(0、4、8、24h)分4组。分别应用Western blot、免疫荧光、RT-PCR、双荧光素酶检测方法,观察TNF-α对IP3RⅠmRNA、蛋白表达及其启动子活性的影响。结果 TNF-α处理组细胞内IP3RⅠ分布未见变化,8、24h组荧光强度增强提示IP3RⅠ蛋白含量增加,IP3RⅠ蛋白表达升高(4h:1.059±0.005 vs 1.000±0.002,P=0.010;8h:2.416±0.042 vs 1.000±0.002,P<0.01;24h:2.138±0.010vs 1.000±0.002,P<0.01,n=9),IP3RⅠmRNA表达明显增加(4h:2.260±0.889 vs 1.00±0.02,P=0.193;8h:5.449±2.279 vs1.00±0.02,P=0.000;24h:3.049±1.684 vs 1.00±0.02,P=0.042,n=9)。转染PGL3-IP3RⅠpromoter质粒后TNF-α组IP3RⅠ启动子活性明显增强(3.56±0.65 vs 1.00±0.05,P=0.020,n=9)。结论 TNF-α可上调IP3RⅠ基因启动子活性,从而引起IP3RⅠ蛋白表达升高,增强VSMC内IP3Rs系统介导的Ca2+释放作用,这可能是TNF-α影响VSMC收缩功能参与感染性休克血管调控的机制之一。

水稻1,3,4-三磷酸肌醇5/6-激酶基因的电子克隆及表达

利用电子克隆的基因克隆策略,以拟南芥1,3,4-三磷酸肌醇5/6-激酶AtITL1的cDNA序列为信息探针,在水稻基因组数据库搜索到高度同源的水稻基因组序列,通过人工序列拼接及RT-PCR方法克隆得到了水稻编码1,3,4-三磷酸肌醇5/6-激酶类似物的基因OsITL1的全长cDNA序列。RNA凝胶印迹分析表明,OsITL1基因的表达在转录水平上受NaCl、干旱及ABA的诱导,OsITL1可能参与了一些非生物胁迫的应答过程,在逆境条件下的基因转录和磷酸肌醇信号转导途径的调控中起重要作用。

Participation of the inositol 1,4,5-trisphosphategated calcium channel in the zona pellucida- and progesterone-induced acrosome reaction and calcium influx in human spermatozoa

The acrosome reaction is a prerequisite for fertilization,and its signaling pathway has been investigated for decades.Regardless of the type of inducers present,the acrosome reaction is ultimately mediated by the elevation of cytosolic calcium.Inositol 1,4,5-trisphosphate-gated calcium channels are important components of the acrosome reaction signaling pathway and have been confirmed by several researchers.In this study,we used a novel permeabilization tool BioPORTER?and first demonstrated its effectiveness in spermatozoa.The inositol 1,4,5-trisphosphate type-1 receptor antibody was introduced into spermatozoa by BioPORTER?and significantly reduced the calcium influx and acrosome reaction induced by progesterone,solubilized zona pellucida,and the calcium ionophore A23187.This finding indicates that the inositol 1,4,5-trisphosphate type-1 receptor antibody is a valid inositol 1,4,5-trisphosphate receptor inhibitor and provides evidence of inositol 1,4,5-trisphosphate-gated calcium channel involvement in the acrosome reaction in human spermatozoa.Moreover,we demonstrated that the transfer of 1,4,5-trisphosphate into spermatozoa induced acrosome reactions,which provides more reliable evidence for this process.In addition,by treating the spermatozoa with inositol 1,4,5-trisphosphate/BioPORTER?in the presence or absence of calcium in the culture medium,we showed that the opening of inositol 1,4,5-trisphosphate-gated calcium channels led to extracellular calcium influx.This particular extracellular calcium influx may be the major process of the final step of the acrosome reaction signaling pathway.

花生1,3,4-三磷酸肌醇5/6激酶ITPK家族基因的鉴定和分析

1,3,4-三磷酸肌醇5/6-激酶(ITPK)是一种保守的多功能酶,调控磷酸肌醇的代谢过程,广泛存在于动植物和线虫中。本研究从两个野生种花生基因组(Arachis duranensis和Arachis ipaensis)中获得Ad ITPK家族基因7个,Ai ITPK家族基因7个,利用生物信息学手段,系统地分析花生ITPK家族基因生物学特征。结果表明,Ad ITPKs和AiITPKs基因的染色体定位相似,在03号和05号染色体上都分别有2个ITPK家族成员,Ad ITPKs在A01、A08和A10号染色体上各1个,Ai ITPKs在B01、B07和B10号染色体上各1个;花生各ITPK基因含外显子数量在1~10个不等,可编码220~483个氨基酸;进化关系分析显示花生ITPK家族基因可分为3个亚家族;基于保守结构域分析显示,此家族蛋白含有4~6个保守结构基序。两基因组同源基因的二级结构相似性较大,而Ad ITPK5和Ai ITPK5、Ad ITPK6和AiITPK6两对同源基因例外;大部分基因的三级结构皆相似,但Ad ITPK1、Ad ITPK6、Ai ITPK1和Ai ITPK6与其余基因明显不同;花生ITPK家族基因在各器官中表达量不同,在发育前期的种子、根系和根瘤中表达较高。本研究为花生ITPK基因的后续研究奠定理论基础,为明确ITPK对花生生长中的调控作用提供了依据。

1,4,5-三磷酸肌醇受体与心血管疾病

1,4,5-三磷酸肌醇受体是一种细胞内Ca2+释放通道,它与1,4,5-三磷酸肌醇结合后,引起Ca2+浓度发生改变,从而参与钙信号转导,调节多种细胞代谢活动。近年来,越来越多的研究提示其参与心力衰竭、心肌肥厚、心房颤动等心血管疾病的发生。现就三磷酸肌醇受体的结构、分布、激活Ca2+通道开放以及与心血管疾病发病机制的研究进展等作一综述。

API0134对高脂血症家兔血栓形成及血小板信号转导物质的影响

建立高脂血症家兔动脉血小板依赖性血栓模型 ,应用流式细胞术、放射免疫法及3 H 肌醇掺合等检测方法观察穿心莲成分API0 134对闭塞性血栓形成时间、血小板聚集功能、血小板胞浆游离Ca2 +和Mg2 +浓度以及血小板内环磷酸腺苷、环磷酸鸟苷和三磷酸肌醇含量的影响。结果发现 ,API0 134能够显著延长闭塞性血栓形成时间和抑制血小板聚集。 5 0mg kgAPI0 134的药理作用明显强于 5mg kgAPI0 134。API0 134可显著抑制血栓形成所诱导的血小板内 [Ca2 +]i、[Mg2 +]i和三磷酸肌醇浓度升高 ,显著抑制血小板内环磷酸腺苷浓度降低。抑制作用与用药剂量有关。结果提示 ,API0 134具有较强的抗血栓形成和抗血小板聚集作用。抗血小板聚集的作用机制与调节血小板信号转导物质 [Ca2 +]i、[Mg2 +]i。

1,4,5-三磷酸肌醇受体3促进常染色体显性遗传性多囊肾病囊泡生长

本文旨在阐明1,4,5-三磷酸肌醇受体3(inositol 1,4,5-trisphosphate receptor 3,IP_(3)R3)在常染色体显性遗传性多囊肾病(autosomal dominant polycystic kidney disease,ADPKD)肾囊泡发生、发展过程中的作用,为ADPKD的治疗提供理论基础。使用2-氨基乙氧基二苯基硼酸盐(2-aminoethoxy-diphenyl borate,2-APB)和shRNA抑制IP_(3)R3的表达水平,通过MDCK(MadinDarby canine kidney)囊泡模型、胚胎肾囊泡模型、肾脏特异性Pkd1敲除(PKD)小鼠模型探究IP_(3)R3在囊泡生长过程中的作用,并通过Western blot、免疫荧光染色技术探究IP_(3)R3调控囊泡生长的分子机制。结果显示,在PKD小鼠肾脏中,IP_(3)R3的表达水平显著升高。在胚胎肾囊泡模型和MDCK囊泡模型中,通过2-APB或shRNA抑制IP_(3)R3的表达可显著延缓囊泡的生长。机制研究结果显示,在ADPKD肾囊泡生长过程中,异常活化的cAMP-PKA信号通路促进了IP_(3)R3的表达,并促进其从内质网向细胞间连接处转运。IP_(3)R3的上调以及亚细胞定位的异常激活MAPK和mTOR信号通路,加速细胞周期,引起囊泡上皮细胞异常增殖,最终促进囊泡的生长。上述结果提示,IP_(3)R3在促进ADPKD肾囊泡生长过程中发挥重要作用,抑制IP_(3)R3的表达及亚细胞再分布过程可以有效延缓囊泡的生长,而IP_(3)R3有望成为ADPKD的治疗靶点。

三磷酸肌醇、钙离子在胃泌素促人结肠癌SW480细胞株增殖中的作用

目的：探讨胃泌素对人结肠癌细胞株ＳＷ４８０内三磷酸肌醇（ＩＰ３）、钙离子（Ｃａ２＋）的影响及其在细胞增殖中的作用，为结肠癌抗信息传导治疗提供实验依据。方法：①３Ｈ－肌醇标记细胞进行ＩＰ３分析。②应用Ｃａ２＋荧光指示剂Ｆｕｒａ－２检测细胞内Ｃａ２＋的浓度。③ＭＴＴ比色分析法检测活细胞数（吸光度Ａ值）。结果：５肽胃泌素（Ｐｅｎｔａｇａｓｔｒｉｎ，ＰＧ）可使ＳＷ４８０细胞内ＩＰ３、Ｃａ２＋水平升高，同时活细胞数Ａ值增加；５肽胃泌素与其受体拮抗剂丙谷胺（Ｐｒｏｇｌｕｍｉｄｅ，ＰＧＬ）合用时，癌细胞内ＩＰ３、Ｃａ２＋水平和活细胞数Ａ值均无明显变化。

4种植物生长物质及温度胁迫对绿豆黄化幼苗肌醇磷脂代谢的影响

利用放射性标记和薄层层析（TIC）分离发现2，4－D，GA3和6－BA可不同程度地促进肌醇－1，4，5－三磷酸（IP3）水平的增加．在最适浓度下的作用效果是：GA3＞2，4－D＞6－BA．但脱落酸（ABA）没有引起IP3含量的变化．低温（0℃）和高温（35℃）胁迫亦引起IP3含量的增加．2，4－D，GA3，6－BA和温度胁迫的共同处理对IP3含量的增加有协同作用．表明2，4－D，GA3，6－BA和温度胁迫促进绿豆黄化幼苗肌醇磷脂代谢，ABA也许不参与绿豆黄化幼苗肌醇磷脂代谢．

暴发性肝衰竭时肾脏Ⅰ型1，4，5-三磷酸肌醇受体表达增加

目的 研究暴发性肝衰竭小鼠肾脏I型1,4,5-三磷酸肌醇受体（IP3R）表达的变化。方法 采用D-氨基半乳糖和内毒素联合腹腔注射制备暴发性肝衰竭小鼠动物模型。动物随机分为4组,即等渗盐水对照组、LPS对照组、D-氨基半乳糖对照组、暴发性肝衰竭组（2、6、9 h）。应用免疫组织化学、Western blot及RT-PCR技术检测暴发性肝衰竭进程中,小鼠肾脏IP3R蛋白质的定位、表达及mRNA表达的变化。结果 Ⅰ型IP3R主要分布于肾小球系膜细胞和血管平滑肌细胞的胞浆内。在暴发性肝衰竭组小鼠,6 h时I型IP3R免疫组织化学染色阳性细胞开始增加,9 h时更为明显（6 h：x^2=7．11,P〈0．01,9 h： x^2=9．15,P〈0.01）。Western blot结果与免疫组织化学结果一致,6 h时开始增加（t=3．16,P〈0．05）,9 h达到最高值（t=5．43,P〈0．01）,与等渗盐水对照组相比差异有统计学意义。RT PCR结果显示暴发性肝衰竭小鼠2 h时I型IP3R mRNA即开始增加,6 h时达到最高值,9 h时有所恢复,但与等渗盐水对照组相比差异均有统计学意义（2 h：t=2．47,P〈0．05,6 h：t=4．42,P〈0.01,9 h：t=2．16,P〈0．05）。结论 在暴发性肝衰竭进程中,肾脏I型1,4,5-三磷酸肌醇受体表达增强,其mRNA也呈上调趋势。