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IJEB Vol.50 [2012] >
IJEB Vol.50(09) [September 2012] >
| Title: | Functional ureogenesis and changes of amino acid metabolism in amphihaline shad hilsa (Tenualosa ilisha, Hamilton-Buchanan) while inhabiting in estuary and freshwater habitats |
| Authors: | Goswami, Umesh C
Rahman, Makibur
Saha, Nirmalendu |
| Keywords: | Amino acid metabolism
Ammonia
Environmental salinity
Migratory fish
Ornithine-urea cycle
Osmotic stress
Urea |
| Issue Date: | Sep-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The possible occurrence of a functional
ornithine-urea cycle (OUC) and changes of activity of key amino acid
metabolism-related enzymes were studied in the amphihaline shad hilsa (Tenualosa ilisha) that were collected
from estuarine water of Kakdwip and from freshwater river basin of Bhrahmaputra
during the breeding season. Very high concentration of urea was detected in
different tissues and plasma of shad hilsa collected from estuarine water
compared to the one collected from freshwater river basin. This observation
clearly suggests that the shad hilsa has the potential of synthesizing and
retaining urea inside the body for the purpose of osmoregulation while living
in hypertonic saline environment of estuary. This was accompanied by the
presence of high activity of all the five OUC enzymes in hepatic and in certain
non-hepatic tissues such as the kidney and muscle of shad hilsa in support of
its potential ureogenic capacity while inhabiting in estuarine water. The
activities of different key amino acid metabolism-related enzymes such as
glutamine synthetase, glutamate dehydrogenase, alanine aminotransaminase and
aspartate aminotransaminase were also found to be significantly higher in shad
hilsa of estuarine water compared to the one collected from freshwater habitat.
Thus the adjustment to amino acid metabolism in shad hilsa in different
environmental salinities appears to play significant roles for osmotic balance
and also for proper energy supply in addition to the presence of a functional
OUC while migrating between marine and freshwater habitats throughout their
life cycle. |
| Page(s): | 652-659 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1009 (Online); 0019-5189 (Print) |
| Source: | IJEB Vol.50(09) [September 2012]
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