Journal
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY B-BIOCHEMISTRY & MOLECULAR BIOLOGY
Volume 216, Issue -, Pages 69-74Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cbpb.2017.12.003
Keywords
Carbonic anhydrase; Gills; Na+/K+ ATPase; Osmoregulation; Palaemonidae
Categories
Funding
- CNPq research fellowship [306630/2011-7]
- CAPES/PRODOC [AUXPE PRODOC 2620/2010]
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Some Macrobrachium shrimps (Caridea, Palaemonidae) are diadromous; freshwater adults are truly euryhaline, while larvae need saline water for development. Branchial Na+/K+-ATPase (NKA) and carbonic anhydrase (CA) are involved in NaCl absorption in freshwater. This study aimed at verifying the time course of the osmoregulatory response of adult Macrobrachium acanthurus to high salinity brackish water (20 parts per thousand), from the first 30 min to 5 days. The goal was to detect possible transition from hyper-to hyporegulation, the putative involvement of branchial NKA and CA, or the induction of muscular HSP70 expression. Hemolymph osmotic and ionic concentrations remained relatively stable and close to control levels until 9 h of exposure, but later increased consistently (similar to 50%). A fast reduction in NKA activity (3-6 h) was observed; these shrimps seem to shut off salt absorption already in the first hours. Later on, especially after 24 h, hemolymph concentrations rise but HSP70 expression is not induced, possibly because constitutive levels are already sufficient to prevent protein damage. Time-dependent response mechanisms effective in high salinity brackish water, resulting in salt loading avoidance and suggestive of hyporegulation should be further investigated in decapods that evolutionary invaded freshwater.
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