Reho John J, Shetty Amol, Dippold Rachael P, Mahurkar Anup, Fisher Steven A
Department of Medicine, Division of Cardiovascular Medicine, University of Maryland-Baltimore, Baltimore, Maryland, 21201.
Institute for Genome Sciences, University of Maryland-Baltimore, Baltimore, Maryland, 21201.
Physiol Rep. 2015 Jul;3(7). doi: 10.14814/phy2.12450.
Deep sequencing of RNA samples from rat small mesenteric arteries (MA) and aorta (AO) identified common and unique features of their gene programs. ~5% of mRNAs were quantitatively differentially expressed in MA versus AO. Unique transcriptional control in MA smooth muscle is suggested by the selective or enriched expression of transcription factors Nkx2-3, HAND2, and Tcf21 (Capsulin). Enrichment in AO of PPAR transcription factors and their target genes of mitochondrial function, lipid metabolism, and oxidative phosphorylation is consistent with slow (oxidative) tonic smooth muscle. In contrast MA was enriched in contractile and calcium channel mRNAs suggestive of components of fast (glycolytic) phasic smooth muscle. Myosin phosphatase regulatory subunit paralogs Mypt1 and p85 were expressed at similar levels, while smooth muscle MLCK was the only such kinase expressed, suggesting functional redundancy of the former but not the latter in accordance with mouse knockout studies. With regard to vaso-regulatory signals, purinergic receptors P2rx1 and P2rx5 were reciprocally expressed in MA versus AO, while the olfactory receptor Olr59 was enriched in MA. Alox15, which generates the EDHF HPETE, was enriched in MA while eNOS was equally expressed, consistent with the greater role of EDHF in the smaller arteries. mRNAs that were not expressed at a level consistent with impugned function include skeletal myogenic factors, IKK2, nonmuscle myosin, and Gnb3. This screening analysis of gene expression in the small mesenteric resistance arteries suggests testable hypotheses regarding unique aspects of small artery function in the regional control of blood flow.
对大鼠小肠系膜动脉(MA)和主动脉(AO)的RNA样本进行深度测序,确定了其基因程序的共同特征和独特特征。MA与AO相比,约5%的mRNA存在定量差异表达。转录因子Nkx2-3、HAND2和Tcf21(Capsulin)的选择性或富集表达表明MA平滑肌存在独特的转录调控。PPAR转录因子及其线粒体功能、脂质代谢和氧化磷酸化靶基因在AO中的富集与缓慢(氧化)张力性平滑肌一致。相比之下,MA富含收缩和钙通道mRNA,提示其为快速(糖酵解)相性平滑肌的组成成分。肌球蛋白磷酸酶调节亚基旁系同源物Mypt1和p85表达水平相似,而平滑肌MLCK是唯一表达的此类激酶,这表明根据小鼠基因敲除研究,前者具有功能冗余,而后者没有。关于血管调节信号,嘌呤能受体P2rx1和P2rx5在MA与AO中呈反向表达,而嗅觉受体Olr59在MA中富集。产生内皮依赖性超极化因子(EDHF)氢过氧化二十碳四烯酸(HPETE)的Alox15在MA中富集,而内皮型一氧化氮合酶(eNOS)表达水平相同,这与EDHF在较小动脉中发挥更大作用一致。未以与可疑功能一致的水平表达的mRNA包括骨骼肌生成因子、IKK2、非肌肉肌球蛋白和Gnb3。对小肠系膜阻力动脉基因表达的这种筛选分析提出了关于小动脉功能在区域血流控制中独特方面的可检验假设。
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