Branchial carbonic anhydrase (CA)of gills of Chasmagnathus granulata (Crustacea Decapoda).

LOPEZ MAÑANES A.A.; MAGNONI, L.J.; GOLDEMBERG, A. L.

Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology

Elsevier

Año: 2000 vol. 127 p. 85 - 95

1096-4959

The occurrence, localization and response to environmental salinity of carbonic anhydrase (CA) activity were studied in all of the gills of the euryhaline crab Chasmagnathus granulata from Mar Chiquita coastal lagoon (Buenos Aires Province, Argentina). CA activity in all gills appeared to be dependent on salinity. The pattern of distribution of CA activity among gills was different upon transition of C. granulata from osmoionoconformity (more uniform distribution) to hyperregulation (highest activity in posterior gills 6–8). Upon abrupt salinity change a differential response of CA activity occurred among gills which could suggest a differential role of CA in ion transport process in different gills of this crab. Furthermore, CA activity in anterior and posterior gills was found in cytosolic and microsomal fractions, although highest activity appeared to be membrane-associated. Both pools of CA were also strongly influenced by salinity and very sensitive to sulfonamide acetazolamide. The results suggest a differential participation of branchial CA in ionoregulatory mechanisms of C. granulata. © 2000 Elsevier Science Inc. All rights reserved.Chasmagnathus granulata from Mar Chiquita coastal lagoon (Buenos Aires Province, Argentina). CA activity in all gills appeared to be dependent on salinity. The pattern of distribution of CA activity among gills was different upon transition of C. granulata from osmoionoconformity (more uniform distribution) to hyperregulation (highest activity in posterior gills 6–8). Upon abrupt salinity change a differential response of CA activity occurred among gills which could suggest a differential role of CA in ion transport process in different gills of this crab. Furthermore, CA activity in anterior and posterior gills was found in cytosolic and microsomal fractions, although highest activity appeared to be membrane-associated. Both pools of CA were also strongly influenced by salinity and very sensitive to sulfonamide acetazolamide. The results suggest a differential participation of branchial CA in ionoregulatory mechanisms of C. granulata. © 2000 Elsevier Science Inc. All rights reserved.C. granulata from osmoionoconformity (more uniform distribution) to hyperregulation (highest activity in posterior gills 6–8). Upon abrupt salinity change a differential response of CA activity occurred among gills which could suggest a differential role of CA in ion transport process in different gills of this crab. Furthermore, CA activity in anterior and posterior gills was found in cytosolic and microsomal fractions, although highest activity appeared to be membrane-associated. Both pools of CA were also strongly influenced by salinity and very sensitive to sulfonamide acetazolamide. The results suggest a differential participation of branchial CA in ionoregulatory mechanisms of C. granulata. © 2000 Elsevier Science Inc. All rights reserved.C. granulata. © 2000 Elsevier Science Inc. All rights reserved. Keywords: Branchial enzymes; Carbonic anhydrase; Chasmagnathus granulata; Crabs; Crustaceans; Decapods; Gills; Osmoionorregulation: Branchial enzymes; Carbonic anhydrase; Chasmagnathus granulata; Crabs; Crustaceans; Decapods; Gills; Osmoionorregulation