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  • gallbladder  (2)
  • Chloride secretion  (1)
  • Cl− channel blocker  (1)
Publikationsart
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Erscheinungszeitraum
  • 1
    Digitale Medien
    Digitale Medien
    Electrogenic bicarbonate secretion in gallbladder: induction by barium via neuronal, possibly VIP-ergic pathways (1993)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 348 (1993), S. 526-535 
    Details
    ISSN: 1432-1912
    Schlagwort(e): Transport regulation ; VIP ; VIP antagonist ; Histamine ; Noradrenaline ; Somatostatin ; Cl− channel blocker ; TMB 8
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In guinea-pig gallbladder epithelium, cAMP converts electroneutral HCO inf3 sup− secretion into an electrogenic process. The effects of blood side Ba2+ (5 mmol/l) on HCO inf3 sup− tranport were investigated in vitro, using pH-stat and voltage clamp techniques to determine unidirectional fluxes of HCO inf3 sup− and transepithelial electrical characteristics. Serosal, not mucosal addition of Ba2+ elevated short-circuit current (Isc), transepithelial potential difference, and tissue conductance; it inhibited the absorptive HCO inf3 sup− flux while leaving the secretory flux unchanged. The Isc effect of Ba2+ was inhibited or prevented by tetrodotoxin; D- and Lrpropranolol; the Cl− channel blocker 4-N-methyl-N-phenylaminothiophene-3-carboxylic acid; the intracellular Ca2+ antagonist, 3,4,5-trimethoxybenzoic acid 8-(diethylamino)octyl ester; noradrenaline, by a yohimbine-sensitive action; somatostatin; HCO inf3 sup− -free solutions. Thus Ba2+ appeared to release a neurotransmitter that gives rise to CAMP synthesis sufficcient to turn part of electroneutral HCO inf3 sup− secretion electrogenic. In a search for the involved signalling pathways, the H1-receptor antagonist, cetirizine, largely and hexamethonium, atropine, atenolol, indomethacin, and trifluoperazine entirely failed to antagonize the Isc effect of Ba2+. Similarly, carbachol, dobutamine, salbutamol, and serotonin were unable to mimick the action of Ba2+ and Isc effects of histamine were small and short-lived. By contrast, vasoactive intestinal peptide (VIP; 3 × 10−7 mol/l) completely transformed HCO inf3 sup− secretion into an electrogenic process. The VIP receptor antagonist (4Cl-dPhe6, Leu17)VIP, delayed and reduced the Isc responses to Ba2+ and VIP. As guinea-pig gallbladder epithelial cells possess cAMP-coupled VIP receptors close to VIPergic neurons, Ba2+ is likely to act by releasing VIP from neural terminals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00173214
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Effects of bicarbonate on fluid and electrolyte transport by guinea pig and rabbit gallbladder: Stimulation of absorption (1981)
    Springer
    The journal of membrane biology 62 (1981), S. 175-181 
    Details
    ISSN: 1432-1424
    Schlagwort(e): gallbladder ; NaCl absorption ; HCO3 ; Na/H-exchange ; active transport
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Summary The effect of bicarbonate (HCO3) on fluid absorption by guinea pig gallbladder was investigatedin vitro. Stimulation of fluid absorption was concentration dependent resulting in a fourfold increase in transport over the range 1 to 50mm. Phosphate, Tris, glycodiazine and glutamine buffers failed to substitutte for HCO3 in stimulating absorption. Unidirectional22Na fluxes were measured across short-circuited sheets of guinea pig and rabbit gallbladders mounted in Ussing-type chambers. In both species the net Na flux was unaffected by serosal HCO3 alone but was stimulated by addition of HCO3 to the mucosal bathing solution. Transepithelial electrical potential difference in rabbit gallbladder was about 1.4 mV (lumen positive) when HCO3 was present in the mucosal or in both compartments. This fell to 0.2 mV under HCO3-free conditions or when HCO3 was present only in the serosal solution. The respective values for guinea pig gallbladder were −1.6 and −0.6 mV (lumen negative). HCO3 stimulation of Na absorption by guinea pig gallbladder was abolished by increasing the bathing pH from 7.4 to 7.8, an effect resulting mainly from a reduction inJ mis Na . Tris buffer (25mm) inhibited HCO3-dependent fluid absorption in this species completely at pH 8.5 and partially at 7.5. These results indicate that HCO3 stimulates gallbladder transport in both species by an action from the mucosal side. This effect cannot be attributed to simple buffering of H+ but may be explained by the participation of HCO3 in the maintenance of intracellular H+ for a Na/H-exchange.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01998163
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Stimulation of gallbladder fluid and electrolyte absorption by butyrate (1981)
    Springer
    The journal of membrane biology 62 (1981), S. 183-193 
    Details
    ISSN: 1432-1424
    Schlagwort(e): gallbladder ; NaCl absorption ; HCO3 ; short-chain fatty acids ; Na/H-exchange ; HCO3/Cl-Exchange ; active transport
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Summary Gallbladder fluid and electrolyte transport was investigatedin vitro. In guinea pig gallbladder, equimolar substitution of acetate, propionate, butyrate or valerate for HCO3 was increasingly effective in stimulating fluid absorption. The stimulatory potency of these compounds was a function of their chloroform water partition coefficients. The stimulatory effects of the isomers isobutyrate and isovalerate were less than predicted from their partition coefficients. Acidification of the gallbladder lumen, however, was strictly dependent on the partition coefficients for all of the above fatty acids. Unidirectional22Na fluxes were measured in rabbit and guinea pig gallbladders under short-circuit conditions. In the presence of butyrate stimulation of net Na flux was due entirely to an increase in the mucosal-to-serosal Na flux. Stimulation by butyrate was abolished by its omission from the mucosal bathing solution. The transepithelial electrical potential difference in both rabbit and guinea pig gallbladder became more lumen positive following mucosal but not serosal addition of butyrate. Net14C-butyrate fluxes were too small to account for stimulation of Na absorption in either species. Butyrate stimulation of Na absorption by guinea pig gallbladder was abolished by increasing the bathing pH from 7.4 to 8.1. Tris buffer (25mm) partially inhibited butyrate-dependent gallbladder fluid absorption by rabbit and guinea pig at pH 6.4 and 7.0, respectively, and completely at pH 8.4. These results reveal a marked similarity between butyrate and HCO3 stimulation of gallbladder NaCl and fluid absorption. The results are best explained by a double ion-exchange model, in which butyrate (HCO3) in the mucosal solution acts to maintain the intracellular supply of H+ and butyrate (HCO3) for countertransport of Na and Cl, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01998164
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Stereospecific inhibition by ozolinone of stimulated chloride secretion in rabbit colon descendens (1982)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 318 (1982), S. 363-367 
    Details
    ISSN: 1432-1912
    Schlagwort(e): Rabbit colon ; Chloride secretion ; Diuretics-Ozolinone ; Stereospecific action
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The effects of the diuretic drug ozolinone on electrogenic Cl− secretion by rabbit colonic mucosa were investigated in vitro. Electrical properties and unidirectional Cl− fluxes were measured in stripped preparations mounted in Ussing-type chambers. After abolition of electrogenic Na+ absorption by amiloride (10−4 mol/l) on the mucosal side electrogenic Cl− secretion was induced by addition of PGE1 (10−6mol/l, serosal side) and theophylline (10−2mol/l, both sides). Under these conditions, the monitored short-circuit current (Isc) equals the amount of Cl− secreted as evidenced by determination of unidirectional Cl− fluxes. After establishing a stable Cl− secretion its sensitivity to the enantiomers of the diuretic was studied. Only levorotatory (-)-ozolinone, but not the dextrorotatory (+)form, inhibited Cl− secretion on serosal application. This effect was fully accounted for by a reduction in the serosal-to-mucosal Cl− fluxes (J sm Cl ). It was readily reversible and concentration-dependent with a K i value of 6×10−4mol/l, but absent when the drug was added to the mucosal side. The results are in agreement with the hypothesis that loop diuretics inhibit a coupled NaCl entry mechanism across the baso-lateral membrane into colonic epithelial cells. This mechanism is though to account for Cl− influx into the cells.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00501179
    Standort Signatur Einschränkungen Verfügbarkeit
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