Osmo- and ionoregulatory responses of green sturgeon (Acipenser medirostris) to salinity acclimation.
Identifieur interne : 000406 ( PubMed/Checkpoint ); précédent : 000405; suivant : 000407Osmo- and ionoregulatory responses of green sturgeon (Acipenser medirostris) to salinity acclimation.
Auteurs : Brian A. Sardella [États-Unis] ; Dietmar KültzSource :
- Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology [ 1432-136X ] ; 2009.
English descriptors
- KwdEn :
- Acclimatization (physiology), Analysis of Variance, Animals, California, Caspases (metabolism), Fishes (physiology), Fresh Water, Hydrogen-Ion Concentration, Laser Scanning Cytometry, Microarray Analysis, Salinity, Seawater, Sodium-Potassium-Exchanging ATPase (metabolism), Water-Electrolyte Balance (physiology).
- MESH :
- chemical , metabolism : Caspases, Sodium-Potassium-Exchanging ATPase.
- geographic : California.
- physiology : Acclimatization, Fishes, Water-Electrolyte Balance.
- Analysis of Variance, Animals, Fresh Water, Hydrogen-Ion Concentration, Laser Scanning Cytometry, Microarray Analysis, Salinity, Seawater.
Abstract
The green sturgeon is a long-lived, highly migratory species with populations that are currently listed as threatened. Their anadromous life history requires that they make osmo- and ionoregulatory adjustments in order to maintain a consistent internal milieu as they move between fresh-, brackish-, and seawater. We acclimated juvenile green sturgeon (121 +/- 10.0 g) to 0 (freshwater; FW), 15 (estuarine; EST), and 24 g/l (SF Bay water; BAY) at 18 degrees C for 2 weeks and measured the physiological and biochemical responses with respect to osmo- and ionoregulatory mechanisms. Plasma osmolality in EST- and BAY-acclimated sturgeon was elevated relative to FW-acclimated sturgeon (P < 0.01), but there was no difference in muscle water content or abundance of stress proteins. Branchial Na(+), K(+)-ATPase (NKA) activity was also unchanged, but abundance within mitochondrion-rich cells (MRC) was greater in BAY-acclimated sturgeon (P < 0.01). FW-acclimated sturgeon had the greatest NKA abundance when assessed at the level of the entire tissue (P < 0.01), but there were no differences in v-type H(+)ATPase (VHA) activity or abundance between salinities. The Na(+), K(+), 2Cl(-) co-transporter (NKCC) was present in FW-acclimated sturgeon gills, but the overall abundance was lower relative to sturgeon in EST or BAY water (P < 0.01) where this enzyme is crucial to hypoosmoregulation. Branchial caspase 3/7 activity was significantly affected by acclimation salinity (P < 0.05) where the overall trend was for activity to increase with salinity as has been commonly observed in teleosts. Sturgeon of this age/size class were able to survive and acclimate following a salinity transfer with minimal signs of osmotic stress. The presence of the NKCC in FW-acclimated sturgeon may indicate the development of SW-readiness at this age/size.
DOI: 10.1007/s00360-008-0321-5
PubMed: 19066909
Affiliations:
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Their anadromous life history requires that they make osmo- and ionoregulatory adjustments in order to maintain a consistent internal milieu as they move between fresh-, brackish-, and seawater. We acclimated juvenile green sturgeon (121 +/- 10.0 g) to 0 (freshwater; FW), 15 (estuarine; EST), and 24 g/l (SF Bay water; BAY) at 18 degrees C for 2 weeks and measured the physiological and biochemical responses with respect to osmo- and ionoregulatory mechanisms. Plasma osmolality in EST- and BAY-acclimated sturgeon was elevated relative to FW-acclimated sturgeon (P < 0.01), but there was no difference in muscle water content or abundance of stress proteins. Branchial Na(+), K(+)-ATPase (NKA) activity was also unchanged, but abundance within mitochondrion-rich cells (MRC) was greater in BAY-acclimated sturgeon (P < 0.01). FW-acclimated sturgeon had the greatest NKA abundance when assessed at the level of the entire tissue (P < 0.01), but there were no differences in v-type H(+)ATPase (VHA) activity or abundance between salinities. The Na(+), K(+), 2Cl(-) co-transporter (NKCC) was present in FW-acclimated sturgeon gills, but the overall abundance was lower relative to sturgeon in EST or BAY water (P < 0.01) where this enzyme is crucial to hypoosmoregulation. Branchial caspase 3/7 activity was significantly affected by acclimation salinity (P < 0.05) where the overall trend was for activity to increase with salinity as has been commonly observed in teleosts. Sturgeon of this age/size class were able to survive and acclimate following a salinity transfer with minimal signs of osmotic stress. The presence of the NKCC in FW-acclimated sturgeon may indicate the development of SW-readiness at this age/size.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">19066909</PMID><DateCreated><Year>2009</Year><Month>03</Month><Day>19</Day></DateCreated><DateCompleted><Year>2009</Year><Month>06</Month><Day>01</Day></DateCompleted><DateRevised><Year>2009</Year><Month>06</Month><Day>08</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1432-136X</ISSN><JournalIssue CitedMedium="Internet"><Volume>179</Volume><Issue>3</Issue><PubDate><Year>2009</Year><Month>Apr</Month></PubDate></JournalIssue><Title>Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology</Title><ISOAbbreviation>J. Comp. Physiol. B, Biochem. Syst. Environ. Physiol.</ISOAbbreviation></Journal><ArticleTitle>Osmo- and ionoregulatory responses of green sturgeon (Acipenser medirostris) to salinity acclimation.</ArticleTitle><Pagination><MedlinePgn>383-90</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1007/s00360-008-0321-5</ELocationID><Abstract><AbstractText>The green sturgeon is a long-lived, highly migratory species with populations that are currently listed as threatened. Their anadromous life history requires that they make osmo- and ionoregulatory adjustments in order to maintain a consistent internal milieu as they move between fresh-, brackish-, and seawater. We acclimated juvenile green sturgeon (121 +/- 10.0 g) to 0 (freshwater; FW), 15 (estuarine; EST), and 24 g/l (SF Bay water; BAY) at 18 degrees C for 2 weeks and measured the physiological and biochemical responses with respect to osmo- and ionoregulatory mechanisms. Plasma osmolality in EST- and BAY-acclimated sturgeon was elevated relative to FW-acclimated sturgeon (P < 0.01), but there was no difference in muscle water content or abundance of stress proteins. Branchial Na(+), K(+)-ATPase (NKA) activity was also unchanged, but abundance within mitochondrion-rich cells (MRC) was greater in BAY-acclimated sturgeon (P < 0.01). FW-acclimated sturgeon had the greatest NKA abundance when assessed at the level of the entire tissue (P < 0.01), but there were no differences in v-type H(+)ATPase (VHA) activity or abundance between salinities. The Na(+), K(+), 2Cl(-) co-transporter (NKCC) was present in FW-acclimated sturgeon gills, but the overall abundance was lower relative to sturgeon in EST or BAY water (P < 0.01) where this enzyme is crucial to hypoosmoregulation. Branchial caspase 3/7 activity was significantly affected by acclimation salinity (P < 0.05) where the overall trend was for activity to increase with salinity as has been commonly observed in teleosts. Sturgeon of this age/size class were able to survive and acclimate following a salinity transfer with minimal signs of osmotic stress. 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