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Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
Cell Specific Gene Expression01:58

Cell Specific Gene Expression

Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Updated: May 24, 2026

Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions
09:17

Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions

Published on: August 2, 2018

Hypoxia-inducible factor-1 and neuroglobin expression.

Bryan Haines1, Marco Demaria, Xiao Mao

  • 1Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA.

Neuroscience Letters
|February 21, 2012
PubMed
Summary

Hypoxia-inducible factor-1 (HIF-1) regulates neuroglobin (Ngb) levels in neural cells. This discovery sheds light on the molecular mechanisms behind Ngb induction, crucial for understanding and treating neurological disorders.

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Induction and Testing of Hypoxia in Cell Culture
07:01

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Published on: August 12, 2011

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Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions
09:17

Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions

Published on: August 2, 2018

Induction and Testing of Hypoxia in Cell Culture
07:01

Induction and Testing of Hypoxia in Cell Culture

Published on: August 12, 2011

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Neuroglobin (Ngb) exhibits cytoprotective properties in neurological conditions like stroke and Alzheimer's disease.
  • The precise molecular mechanisms governing Ngb induction, particularly under hypoxic conditions, remain largely unelucidated.
  • Understanding Ngb regulation is critical for developing novel therapeutic strategies for neurological disorders.

Purpose of the Study:

  • To investigate the role of hypoxia-inducible factor-1 (HIF-1) in regulating neuroglobin (Ngb) expression in neural cells.
  • To test the hypothesis that HIF-1 directly influences Ngb levels.
  • To explore the implications of HIF-1-mediated Ngb regulation for neural cell responses to hypoxia.

Main Methods:

  • Utilized cultured neural (HN33) cells for experimental manipulation.
  • Employed shRNA-mediated knockdown to reduce HIF-1α subunit levels.
  • Used lentiviral vectors for the overexpression of the HIF-1α subunit.

Main Results:

  • HIF-1α knockdown led to a significant decrease in Ngb levels within neural cells.
  • Overexpression of HIF-1α resulted in a notable increase in Ngb levels.
  • These findings provide direct evidence for a functional link between HIF-1 and Ngb induction.

Conclusions:

  • Hypoxia-inducible factor-1 (HIF-1) plays a crucial role in the induction of neuroglobin (Ngb) in neural cells.
  • The study elucidates a key molecular mechanism in the cellular response to hypoxia.
  • Findings offer potential therapeutic targets for neurological disorders by modulating the Ngb pathway.