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Increased expression of eukaryotic initiation factor 4E during growth of neonatal rat cardiocytes in vitro.

机译:在体外新生大鼠心肌细胞生长过程中,真核生物起始因子4E的表达增加。

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摘要

Eukaryotic initiation factor 4E (eIF-4E) is rate limiting for translational initiation. The purpose of this study was to determine whether eIF-4E levels are increased during cardiocyte growth produced by increased load in the form of electrically stimulated contraction. Neonatal rat cardiocytes were cultured on a matrix of aligned type I collagen. The cardiocytes aligned in parallel to the direction of the collagen fibrils and exhibited an elongated, rod-shaped morphology. Cardiocytes were electrically stimulated to contract at 3 Hz (alternating polarity, 5-ms pulse width). Nonstimulated cardiocytes were quiescent and used as controls. Electrically stimulated contraction produced hypertrophic growth as determined by the following criteria: 1) increased protein content, 2) increased RNA content, 3) accelerated rate of protein synthesis, and 4) threefold increase in promoter activity of the atrial natriuretic factor gene. Cardiocyte growth was associated with an increase in eIF-4E mRNA levels that reached 48 +/- 9% after 2 days of electrically stimulated contraction. eIF-4E protein levels were increased by more than twofold over the same time period. We conclude that an adaptive increase in eIF-4E is an important mechanism for maintaining translational efficiency during cardiocyte growth.
机译:真核起始因子4E(eIF-4E)是翻译起始的速率限制。这项研究的目的是确定在以电刺激收缩形式增加负荷而产生的心肌细胞生长过程中,eIF-4E水平是否增加。将新生的大鼠心肌细胞培养在对齐的I型胶原蛋白基质上。心肌细胞平行于胶原纤维的方向排列,并表现出细长的杆状形态。电刺激心肌细胞以3 Hz的频率收缩(交替极性,5毫秒脉冲宽度)。未刺激的心肌细胞静止并用作对照。通过以下标准确定,电刺激的收缩产生了肥大性生长:1)蛋白含量增加; 2)RNA含量增加; 3)蛋白合成速率加快; 4)心钠素基因启动子活性增加了三倍。在电刺激收缩2天后,心肌细胞的生长与eIF-4E mRNA水平的增加相关,达到48 +/- 9%。 eIF-4E蛋白水平在同一时间段内增加了两倍以上。我们得出结论,eIF-4E的适应性增加是在心肌细胞生长过程中维持翻译效率的重要机制。

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