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Molecular and functional regionalization of bicarbonate secretion cascade in the intestine of the European sea bass (Dicentrarchus labrax)

2019-07Journal article Restricted access
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dc.contributor.authorAlves, Alexandra
dc.contributor.authorGregorio, Silvia F.
dc.contributor.authorCatão-Egger, Renata
dc.contributor.authorFuentes, Juan
dc.date.accessioned2020-07-24T10:52:05Z
dc.date.available2020-07-24T10:52:05Z
dc.date.issued2019-07
dc.description.abstractIn marine fish the intestinal HCO3-(-) secretion is the key mechanism to enable luminal aggregate formation and water absorption. Using the sea bass (Dicentrarchus labrax), the present study aimed at establishing the functional and molecular organization of different sections of the intestine concerning bicarbonate secretion and Cl- movements. The proximal intestinal regions presented similar HCO3-- secretion rates, while differences were detected in the molecular expression of the transporters involved and on regional HCO3- concentrations. The anterior region presented significantly higher Na /K+-ATPase activity, Cl transepithelial transport and basolateral slc4a4, apical slc26a6 and slc26a3 expression levels. In the mid intestine, the total HCO3- content was significantly increased in the fluid as in the carbonate aggregates. In the rectum no HCO3- secretion was observed and was characterized by the diminished HCO3- total content, residual molecular expression of slc4a4, slc26a6 and slc26a3, higher H+-ATPase activity and expression, suggesting the existence of a different bicarbonate handling mechanism. The possible regulation of HCO3- secretion by extracellular HCO3- and increased intracellular cAMP levels were also investigated. cAMP did not affect HCO3- secretion, although Cl- secretion was enhanced by cftr. HCO3- secretion rise due to the HCO3- basolateral increment showed that at resting levels slc4a4 was not a limiting step for secretion. The transcellular/intracellular dependence of apical HCO3- secretion differed between the proximal regions. In conclusion, intestinal HCO3- secretion has a functional region-dependent organization that was not reflected by the anterior-posterior regionalization on HCO3- secretion and expression profiles of chloride/water absorption related genes.
dc.description.sponsorshipMinistry of Science and Higher EducationMinistry of Science and Higher Education, Poland
dc.description.sponsorshipEuropean Social Funds through the Portuguese National Science Foundation (FCT) studentship [SFRH/BD/113363/2015, PTDC/MAR-BIO/3034/2014]
dc.description.sponsorship[UID/Multi/04326/2019]
dc.identifier.doi10.1016/j.cbpa.2019.03.017
dc.identifier.issn1095-6433
dc.identifier.issn1531-4332
dc.identifier.urihttp://hdl.handle.net/10400.1/14314
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.subjectMarine teleost fish
dc.subjectBream Sparus-Aurata
dc.subjectHco3-secretion
dc.subjectWater-absorption
dc.subjectCarbonic-anhydrase
dc.subjectAnion-exchange
dc.subjectHigh-rates
dc.subjectAcid-base
dc.subjectH+-Atpase
dc.subjectOsmoregulation
dc.titleMolecular and functional regionalization of bicarbonate secretion cascade in the intestine of the European sea bass (Dicentrarchus labrax)
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage64
oaire.citation.startPage53
oaire.citation.titleComparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology
oaire.citation.volume233
person.familyNameCarvalho Alves
person.familyNameGregorio
person.familyNameCatão-Egger
person.familyNameFuentes
person.givenNameAlexandra
person.givenNameSilvia
person.givenNameRenata
person.givenNameJuan
person.identifier1579837
person.identifier392998
person.identifier.ciencia-id8D19-0844-ACCF
person.identifier.ciencia-idBF14-020B-4C39
person.identifier.ciencia-id421B-E196-2C33
person.identifier.orcid0000-0003-1153-596X
person.identifier.orcid0000-0002-6648-5122
person.identifier.orcid0000-0002-6254-8798
person.identifier.orcid0000-0003-0430-8734
person.identifier.ridG-1618-2018
person.identifier.scopus-author-id7201832526
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublication2b024165-dd12-4014-9ab3-4644b92460b8
relation.isAuthorOfPublication9bc940d8-7dfb-4950-98f4-6853f398cb49
relation.isAuthorOfPublication0f014c2a-feaf-4d72-a5e6-b31225e23827
relation.isAuthorOfPublicationd354b937-b18c-4ca5-a843-04a04269d60f
relation.isAuthorOfPublication.latestForDiscovery2b024165-dd12-4014-9ab3-4644b92460b8

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