Title : Muscarinic activation of Na+-dependent ion transporters and modulation by bicarbonate in rat submandibular gland acinus.

Pub. Date : 2005 Apr

PMID : 15539434






6 Functional Relationships(s)
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1 In the HCO(3)(-)-free condition, the V(h,ACh) was also blocked by bumetanide, a blocker of Na(+)-K(+)-2Cl(-) cotransporter (NKCC). Bicarbonates acyl-CoA thioesterase 12 Rattus norvegicus
2 In the presence of HCO(3)(-) (24 meq, bubbled with 5% CO(2)), however, the V(h,ACh) was not blocked by bumetanide, but it was suppressed by ethylisopropylamiloride (EIPA), a Na(+)/H(+) exchanger (NHE) inhibitor. Bicarbonates acyl-CoA thioesterase 12 Rattus norvegicus
3 ACh induced a prominent acidification of pH(i) in the presence of HCO(3)(-), and the acidification was further increased by EIPA treatment. Bicarbonates acyl-CoA thioesterase 12 Rattus norvegicus
4 Without HCO(3)(-), an application of ACh strongly accelerated the NKCC activity that was measured from the decay of pH(i) during the application of NH(4)(+) (20 mM). Bicarbonates acyl-CoA thioesterase 12 Rattus norvegicus
5 Notably, the ACh-induced activation of NKCC was largely suppressed in the presence of HCO(3)(-). Bicarbonates acyl-CoA thioesterase 12 Rattus norvegicus
6 The regulation of NKCC and NHE by ACh is strongly affected by the physiological level of HCO(3)(-). Bicarbonates acyl-CoA thioesterase 12 Rattus norvegicus