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Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions
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Identification and characterization of demethylase JMJD1A as a gene upregulated in the human cellular response to

Aylin Sar1, Dragana Ponjevic, Monica Nguyen

  • 1The Department of Pathology, University of Calgary, AB, Canada.

Cell and Tissue Research
|May 28, 2009
PubMed

Insights

Hypoxia, a low-oxygen state in cancers, upregulates JMJD1A, a histone demethylase. This gene

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cellular Biology

Background:

  • Hypoxia is prevalent in solid tumors, promoting cancer cell survival and therapy resistance.
  • Cellular responses to hypoxia include metabolic shifts, growth arrest, and cell death, with incompletely defined mechanisms.
  • Identifying genes involved in hypoxia-induced growth arrest is crucial for understanding cancer progression.

Purpose of the Study:

  • To identify genes upregulated in response to hypoxia using expression microarray analysis.
  • To investigate the role of JMJD1A (JHDM2A) in the cellular response to hypoxia.
  • To characterize the expression and localization of JMJD1A under hypoxic conditions.

Main Methods:

  • Expression microarray analysis of diverse cell lines under hypoxic conditions.
  • Reverse-transcriptase polymerase chain reaction (RT-PCR) for gene expression validation.
  • Immunofluorescence and immunohistochemical staining for protein localization studies.

Main Results:

  • A cohort of genes was reliably upregulated by hypoxia across multiple cell lines.
  • JMJD1A (JHDM2A), a histone demethylase, was identified as a hypoxia-upregulated gene.
  • JMJD1A expression increased upon hypoxia and desferrioxamine treatment; it translocates to the nucleus and is widely expressed in tissues.

Conclusions:

  • JMJD1A is a hypoxia-responsive gene involved in cellular responses to low-oxygen environments.
  • The nuclear localization and broad tissue expression of JMJD1A suggest a significant role in normal and potentially cancerous tissues.
  • Further research is warranted to elucidate JMJD1A's precise function in hypoxia-induced pathways and cancer.

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