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Related Experiment Videos

Expression and localization of a novel Rab small G protein (Rab38) in the rat lung.

K Osanai1, M Iguchi, K Takahashi

  • 1Department of Internal Medicine, Division of Respiratory Disease, Kanazawa Medical University, Ishikawa, Japan. k-osanai@kanazawa-med.ac.jp

The American Journal of Pathology
|May 5, 2001
PubMed
Summary

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A novel Rab small G protein, Rab38, is expressed in rat lung alveolar type II and bronchial epithelial cells. This protein plays a role in vesicular transport within the terminal airway epithelium.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Respiratory System Research

Background:

  • The Rab small G protein family is crucial for intracellular vesicle transport, including exocytosis and endocytosis.
  • A novel Rab-related small G protein, Rab38, has been identified, but its lung-specific expression and function are largely unknown.

Purpose of the Study:

  • To investigate the expression and cellular localization of the novel Rab38 protein and its mRNA in the rat lung.
  • To determine the subcellular localization and potential function of Rab38 in alveolar type II cells.

Main Methods:

  • Production of polyhistidine-tagged recombinant Rab38 and a specific polyclonal antibody.
  • Immunohistochemistry and in situ hybridization to determine protein and mRNA localization.
  • Western blot and RT-PCR to analyze protein and mRNA expression in isolated lung cells.

Related Experiment Videos

  • Subcellular fractionation and immunofluorescence cytochemistry to assess Rab38's intracellular distribution.

    • Main Results:

    • Rab38 protein and mRNA are specifically localized in rat lung alveolar type II cells and bronchial epithelial cells, particularly in terminal airway epithelium.
    • Distinct expression of Rab38 was observed in isolated alveolar type II cells, but not in alveolar macrophages.
    • The native Rab38 protein is hydrophobic, enriched in high-density vesicle fractions, and shows a cytoplasmic distribution in alveolar type II cells, resembling the endoplasmic reticulum.

    Conclusions:

    • The novel Rab small G protein, Rab38, is expressed in specific lung epithelial cells and is involved in vesicular transport mechanisms within the terminal airway epithelium.