Diminished Levels of Protein Kinase A RIα and RIβ Transcripts and Proteins in Systemic Lupus Erythematosus T Lymphocytes

Diminished Levels of Protein Kinase A RIα and RIβ Transcripts and Proteins in Systemic Lupus Erythematosus T Lymphocytes
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系统性红斑狼疮 T 淋巴细胞中蛋白激酶 A RIα 和 RIβ 转录物和蛋白质水平降低

DOI:
10.4049/jimmunol.162.9.5639
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发表时间:
1999
期刊:
The Journal of Immunology
影响因子:
--
通讯作者:
G. Kammer
G. Kammer
中科院分区:
--
文献类型:
--
作者:
D. Laxminarayana;I. Khan;N. Mishra;I. Olorenshaw;K. Taskén;G. Kammer

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80%的系统性红斑狼疮(SLE)患者的T细胞中存在I型蛋白激酶A磷酸转移酶活性缺陷。为了研究这种同工酶活性缺陷的机制,我们假设I型调节(RI)同工型转录物RIα和RIβ的数量减少可能与RIα和/或RIβ蛋白的减少有关。研究了16名SLE受试者,平均(±1 SD)SLE疾病活动指数为12.4 ± 7.2。对照组包括16名正常受试者、6名原发性舍格伦综合征(SS)受试者和3名SS/SLE重叠受试者。RT-PCR显示正常、SS、SS/SLE和SLE T细胞表达所有7种R和催化(C)亚基亚型的mRNA。竞争性PCR定量结果显示,正常T细胞RIα mRNA与RIβ mRNA的比值为3.4:1。在SLE T细胞中,RIα和RIβ mRNA分别降低20%和49%(RIβ; p = 0.008),导致RIα:RIβ mRNA为5.3:1。SS/SLE T细胞RIβ mRNA表达较正常对照组降低72.5%(p = 0.01)。正常T细胞RIα和RIβ蛋白的免疫印迹显示RIα:RIβ的比例为3.2:1。在SLE T细胞中,RIα蛋白减少30%(p = 0.002),RIβ蛋白减少65%(p < 0.001),RIα:RIβ蛋白的比例变为6.5:1。25%的SLE受试者的T细胞缺乏任何可检测到的RIβ蛋白。对几种狼疮T细胞系的分析表明,这两种蛋白质的持续缺乏,排除了疾病活动的潜在影响。总之,RIα和RIβ转录本的表达减少与RIα和RIβ蛋白的减少有关,并且可能有助于SLE T细胞中I型蛋白激酶A同工酶活性的缺陷。
Deficient type I protein kinase A phosphotransferase activity occurs in the T cells of 80% of subjects with systemic lupus erythematosus (SLE). To investigate the mechanism of this deficient isozyme activity, we hypothesized that reduced amounts of type I regulatory (RI) isoform transcripts, RIα and RIβ, may be associated with a diminution of RIα and/or RIβ protein. Sixteen SLE subjects with a mean (±1 SD) SLE disease activity index of 12.4 ± 7.2 were studied. Controls included 16 normal subjects, six subjects with primary Sjögren’s syndrome (SS), and three subjects with SS/SLE overlap. RT-PCR revealed that normal, SS, SS/SLE, and SLE T cells expressed mRNAs for all seven R and catalytic (C) subunit isoforms. Quantification of mRNAs by competitive PCR revealed that the ratio of RIα mRNA to RIβ mRNA in normal T cells was 3.4:1. In SLE T cells there were 20 and 49% decreases in RIα and RIβ mRNAs (RIβ; p = 0.008), respectively, resulting in an RIα:RIβ mRNA of 5.3:1. SS/SLE T cells showed a 72.5% decrease in RIβ mRNA compared with normal controls (p = 0.01). Immunoblotting of normal T cell RIα and RIβ proteins revealed a ratio of RIα:RIβ of 3.2:1. In SLE T cells, there was a 30% decrease in RIα protein (p = 0.002) and a 65% decrease in RIβ protein (p < 0.001), shifting the ratio of RIα:RIβ protein to 6.5:1. T cells from 25% of SLE subjects lacked any detectable RIβ protein. Analysis of several lupus T cell lines demonstrated a persistent deficiency of both proteins, excluding a potential effect of disease activity. In conclusion, reduced expression of RIα and RIβ transcripts is associated with a decrement in RIα and RIβ proteins and may contribute to deficient type I protein kinase A isozyme activity in SLE T cells.
系统性红斑狼疮患者循环血清因子对 T 淋巴细胞中蛋白激酶 A (PKA) 活性和 PKA 依赖性蛋白磷酸化的影响。
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发表时间: 1993
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影响因子: --
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系统性红斑狼疮 T 淋巴细胞中 I 型蛋白激酶 A 同工酶活性缺陷:II。
DOI: --
发表时间: 1996
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
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DOI: 10.1126/science.2876518
发表时间: 1986-10-17
期刊: SCIENCE
影响因子: 56.9
作者:
ROGERS, S;WELLS, R;RECHSTEINER, M
通讯作者: RECHSTEINER, M
含有 I 型调节亚基的神经形式的 cAMP 依赖性蛋白激酶的全酶对环核苷酸具有增加的敏感性。
DOI: --
发表时间: 1990
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: McKnight,GS
系统性红斑狼疮 T 淋巴细胞免疫功能障碍。
DOI: --
发表时间: 1990
期刊: The Journal of laboratory and clinical medicine
影响因子: --
作者:
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通讯作者: Stein,RL