Abstract
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Cellular Physiology and Biochemistry |
| Vol/bind | 21 |
| Udgave nummer | 5-6 |
| Sider (fra-til) | 373-84 |
| Antal sider | 11 |
| ISSN | 1015-8987 |
| DOI | |
| Status | Udgivet - 2008 |
Bibliografisk note
KEYWORDS: Amino Acid Sequence; Animals; Eels; Humans; Intestinal Mucosa; Microscopy, Confocal; Molecular Sequence Data; Potassium Channels, Calcium-Activated; Sequence Alignment; Sequence Homology, Amino AcidAdgang til dokumentet
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Molecular and functional expression of high conductance Ca 2+ activated K+ channels in the eel intestinal epithelium. / Lionetto, Maria G; Rizzello, Antonia; Giordano, Maria E; Maffia, Michele; De Nuccio, Francesco; Nicolardi, Giuseppe; Hoffmann, Else K; Schettino, Trifone.
I: Cellular Physiology and Biochemistry, Bind 21, Nr. 5-6, 2008, s. 373-84.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review
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TY - JOUR
T1 - Molecular and functional expression of high conductance Ca 2+ activated K+ channels in the eel intestinal epithelium.
AU - Lionetto, Maria G
AU - Rizzello, Antonia
AU - Giordano, Maria E
AU - Maffia, Michele
AU - De Nuccio, Francesco
AU - Nicolardi, Giuseppe
AU - Hoffmann, Else K
AU - Schettino, Trifone
N1 - KEYWORDS: Amino Acid Sequence; Animals; Eels; Humans; Intestinal Mucosa; Microscopy, Confocal; Molecular Sequence Data; Potassium Channels, Calcium-Activated; Sequence Alignment; Sequence Homology, Amino Acid
PY - 2008
Y1 - 2008
N2 - Several types of K(+) channels have been identified in epithelial cells. Among them high conductance Ca(2+)-activated K(+) channels (BK channels) are of relevant importance for their involvement in regulatory volume decrease (RVD) response following hypotonic stress. The aim of the present work was to investigate the functional and molecular expression of BK in the eel intestine, which is a useful experimental model for cell volume regulation research. In the present paper using rat BK channel-specific primer, a RT-PCR signal of 696 pb cDNA was detected in eel intestine, whole nucleotide sequence showed high similarity (83%) to the alpha subunit of BK channel family. BK channel protein expression was verified by immunoblotting and confocal microscopy, while the functional role of BK channels in epithelial ion transport mechanisms and cell volume regulation was examined by electrophysiological and morphometric analysis on the intact tissue. BK(Ca) channels appeared to be localized along all the plasma membrane of the enterocytes; the apical part of the villi showed the most intense immunostaining. These channels were silent in basal condition, but were activated on both membranes (apical and basolateral) by increasing intracellular Ca(2+) concentration with the Ca(2+) ionophore ionomycin (1 microM). BK(Ca) channels were also activated on both membranes by hypotonic swelling of the epithelium and their inhibition by 100 nM iberiotoxin (specific BK(Ca) inhibitor) abolished the Regulatory Volume Decrease (RVD) of the intestinal cells after hypotonic swelling. In conclusion, our results demonstrated the molecular and functional expression of high conductance Ca(2+) -activated K(+) channels in eel intestine; the physiological role of these channels is mainly related to the RVD response of the epithelial cells following hypotonic swelling.
AB - Several types of K(+) channels have been identified in epithelial cells. Among them high conductance Ca(2+)-activated K(+) channels (BK channels) are of relevant importance for their involvement in regulatory volume decrease (RVD) response following hypotonic stress. The aim of the present work was to investigate the functional and molecular expression of BK in the eel intestine, which is a useful experimental model for cell volume regulation research. In the present paper using rat BK channel-specific primer, a RT-PCR signal of 696 pb cDNA was detected in eel intestine, whole nucleotide sequence showed high similarity (83%) to the alpha subunit of BK channel family. BK channel protein expression was verified by immunoblotting and confocal microscopy, while the functional role of BK channels in epithelial ion transport mechanisms and cell volume regulation was examined by electrophysiological and morphometric analysis on the intact tissue. BK(Ca) channels appeared to be localized along all the plasma membrane of the enterocytes; the apical part of the villi showed the most intense immunostaining. These channels were silent in basal condition, but were activated on both membranes (apical and basolateral) by increasing intracellular Ca(2+) concentration with the Ca(2+) ionophore ionomycin (1 microM). BK(Ca) channels were also activated on both membranes by hypotonic swelling of the epithelium and their inhibition by 100 nM iberiotoxin (specific BK(Ca) inhibitor) abolished the Regulatory Volume Decrease (RVD) of the intestinal cells after hypotonic swelling. In conclusion, our results demonstrated the molecular and functional expression of high conductance Ca(2+) -activated K(+) channels in eel intestine; the physiological role of these channels is mainly related to the RVD response of the epithelial cells following hypotonic swelling.
U2 - 10.1159/000129630
DO - 10.1159/000129630
M3 - Journal article
C2 - 18453745
VL - 21
SP - 373
EP - 384
JO - Cellular Physiology and Biochemistry
JF - Cellular Physiology and Biochemistry
SN - 1015-8987
IS - 5-6
ER -