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Altered Expression of High Molecular Weight Heat Shock Proteins after OCT4B1 Suppression in Human Tumor Cell Lines

Mohammad Reza Mirzaei1, Mohammad Kazemi Arababadi2, Malek Hossein Asadi3

  • 1Department of Molecular Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran; Molecular Medicine Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran.

Cell Journal
|February 11, 2016
PubMed
Abstract

Insights

Silencing OCT4B1 (octamer-binding transcription factor 4 variant B1) impacts heat shock protein (HSP) expression in tumor cells. OCT4B1 knockdown upregulates HSP70 and HSP60 family members while downregulating HSP90 family members.

Area of Science:

  • Cancer Biology
  • Molecular Oncology
  • Gene Regulation

Background:

  • OCT4B1 (octamer-binding transcription factor 4 variant B1) is a novel OCT4 variant found in cancer cells.
  • Previous studies indicate OCT4B1's role in apoptosis and stress response pathways involving heat shock proteins (HSPs).

Purpose of the Study:

  • To investigate the effect of OCT4B1 silencing on the expression of high molecular weight heat shock proteins (HSPs) in human tumor cell lines.
  • To elucidate the relationship between OCT4B1 and HSP gene families in cancer.

Main Methods:

  • OCT4B1 expression was suppressed using RNA interference (RNAi) in AGS, 5637, and U-87MG cell lines.
  • Real-time PCR arrays were utilized to analyze gene expression levels.
  • Fold changes in gene expression were calculated using RT2 Profiler PCR array data analysis software.

Main Results:

  • OCT4B1 knockdown led to the upregulation of HSPD1 (HSP60 family) and several HSP70 family members (HSPA14, HSPA1L, HSPA4, HSPA5, HSPA8) across all tested cell lines.
  • Conversely, HSP90AA1, HSP90AB1 (HSP90 family), and HSPA1B, HSPA6 (HSP70 family) were downregulated.
  • Other stress-related genes exhibited varied expression patterns.

Conclusions:

  • OCT4B1 expression shows a correlation with the HSP90 gene family.
  • OCT4B1 expression is not strongly correlated with HSP70 and HSP60 gene families.
  • These findings suggest a specific regulatory role of OCT4B1 in HSP expression within tumor cells.
Keywords:
HSPsTumor Cell LinessiRNA

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