Increased messenger RNA from protein synthesis inhibited human fibroblasts

✍ Scribed by L. E. Maroun; E. T. Miller

• Publisher: John Wiley and Sons
• Year: 1977
• Tongue: English
• Weight: 381 KB
• Volume: 92
• Category: Article
• ISSN: 0021-9541
• DOI: 10.1002/jcp.1040920306

✦ Synopsis

Abstract

Numerous reports have demonstrated that specific protein synthesis in response to specific inducers is markedly stimulated by a simultaneous brief exposure to protein synthesis inhibitors such as cycloheximide. This phenomenon is known as “superinduction” and is most often attributed to the accumulation of cytoplasmic messenger RNA during the inhibition period. Messenger RNA, as defined by rapid labeling, oligo (dt)‐cellulose binding, and cell free protein synthesis stimulation was measured in cycloheximide treated human fibroblasts. In spite of a consistent 40% decrease in total polysomal ^3^H‐uridine labeled RNA, a 1.5‐ to 2‐fold increase in extractable mRNA was observed. These data provide direct evidence that protein synthesis inhibition stimulates the appearance of cytoplasmic mRNA and/or completely blocks its degradation and, are consistent with the hypothesis that mRNA accumulation partly underlies the superinduction phenomena.