Absorption of macromolecular proteins by the rectal epithelium of the Antarctic fish Notothenia neglecta
The absorption of intact proteins by Notothenia neglecta enterocytes was studied by both light and electron microscopy after administration of ferritin by the oral and anal routes. Intense pinocytosis of ferritin occurs in the second half of the preanal segment, located distal to the rectal valve, w...
| Published in: | Canadian Journal of Zoology |
|---|---|
| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Canadian Science Publishing
1998
|
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1139/z98-066 http://www.nrcresearchpress.com/doi/pdf/10.1139/z98-066 |
| Summary: | The absorption of intact proteins by Notothenia neglecta enterocytes was studied by both light and electron microscopy after administration of ferritin by the oral and anal routes. Intense pinocytosis of ferritin occurs in the second half of the preanal segment, located distal to the rectal valve, which is equivalent to 5% of the intestine length. The ferritin was identified after 48 h by light microscopy and was also observed in the interior of the electron-dense cytoplasmic vesicles of the rectal epithelium. Uptake and transport of protein macromolecules by the oral route are less marked than in other fishes studied. As ferritin uptake was more intense by the anal route, we conclude that the rectum of N. neglecta is the intestinal segment where endogenous or exogenous proteins are normally absorbed in great quantity by pinocytosis. |
|---|