Novel localization of Rab3D in rat intestinal goblet cells and Brunner's gland acinar cells suggests a role in early Golgi trafficking
| Autor: | Anton Ultee, Jack A. Valentijn, Laura van Weeren, Abraham J. Koster |
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| Rok vydání: | 2007 |
| Předmět: |
Male
medicine.medical_specialty Colon Duodenum Physiology rab3 GTP-Binding Proteins Vesicular Transport Proteins Fluorescent Antibody Technique Golgi Apparatus Brunner Glands Nerve Tissue Proteins Biology Exocytosis symbols.namesake Physiology (medical) Internal medicine medicine Animals Endocrine system Rats Wistar Adaptor Proteins Signal Transducing Goblet cell Hepatology Gastroenterology Golgi apparatus Rats Cell biology Protein Transport medicine.anatomical_structure Endocrinology Brunner's glands symbols Carbachol Goblet Cells Deoxycholic Acid |
| Zdroj: | American Journal of Physiology-Gastrointestinal and Liver Physiology. 293:G165-G177 |
| ISSN: | 1522-1547 0193-1857 |
| Popis: | Rab3D is a small GTP-binding protein that associates with secretory granules of endocrine and exocrine cells. The physiological role of Rab3D remains unclear. While it has initially been implicated in the control of regulated exocytosis, recent deletion-mutation studies have suggested that Rab3D is involved in the biogenesis of secretory granules. Here, we report the unexpected finding that Rab3D also associates with early Golgi compartments in intestinal goblet cells and in Brunner's gland acinar cells. Expression of Rab3D in the intestine was demonstrated by SDS-PAGE and Western blot analysis of homogenates prepared from the rat duodenum and colon. Confocal laser scanning microscopy revealed Rab3D immunofluorescence in the Golgi area of goblet cells of the duodenum and colon and in Brunner's gland acinar cells. There was no colocalization between Rab3D and a trans-Golgi network marker, TGN-38. In contrast, Rab3D colocalized partially with a cis-Golgi marker, GM-130, and with a marker of cis-Golgi and coat protein complex I vesicles, β-COP. Strong colocalization was observed between Rab3D and the lectins Griffonia simplicifolia agglutinin II and soybean agglutinin, which have been described as markers of the medial and cis-Golgi, respectively. Rabphilin, a putative effector of Rab3D, displayed an identical pattern of Golgi localization. Incubation of colon tissue with carbamylcholine or deoxycholate to stimulate exocytosis by goblet cells caused a partial redistribution of Rab3D to the cytoplasm and mucous granule field and a concomitant transformation of the Golgi architecture. Taken together, the present data suggest that Rab3D and rabphilin may regulate the secretory pathway at a much earlier stage than what has hitherto been assumed. |
| Databáze: | OpenAIRE |
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