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Rab11 is an apically located small GTP-binding protein in epithelial tissues
J R Goldenring1, J Smith, H D Vaughan
1Department of Medicine, Medical College of Georgia, Augusta 30912, USA.
The American Journal of Physiology
|March 1, 1996
Summary
Rab11, a key protein in vesicle transport, is highly expressed in epithelial cells across various rabbit tissues, particularly in gastric parietal cells. This study maps its distribution in distinct cell types, revealing its role in apical vesicular populations.
Area of Science:
- Cell Biology
- Molecular Biology
- Gastroenterology
Background:
- Rab proteins regulate vesicle trafficking in eukaryotic cells.
- Rab11 was previously identified in gastric parietal cell tubulovesicle membranes.
- A specific monoclonal antibody for Rab11 was developed.
Purpose of the Study:
- To characterize the tissue distribution of Rab11 in rabbit epithelia.
- To identify specific cell types expressing Rab11.
- To understand Rab11's role in apical vesicular transport.
Main Methods:
- Immunohistochemistry using a novel monoclonal antibody specific for Rab11.
- Examination of various rabbit tissues including gastric fundus, antrum, ileum, colon, skin, esophagus, liver, pancreas, and prostate.
- Microscopic analysis of Rab11 immunoreactivity patterns.
Main Results:
- Rab11 immunoreactivity was enriched in epithelial cells across all examined rabbit tissues.
- Specific localization patterns were observed in gastric parietal cells (tubulovesicles), surface mucous cells, enterocytes, hepatocytes, pancreatic acinar cells, collecting duct cells, and prostate glandular cells.
- Punctate subapical or apical staining indicated Rab11's presence in vesicular populations.
Conclusions:
- Rab11 is widely expressed in discrete epithelial cell populations throughout rabbit tissues.
- The observed localization suggests Rab11's involvement in apical vesicular transport in various cell types.
- This study provides a comprehensive map of Rab11 distribution in epithelial cells.