Biomaterial Database

Stimulation of apical H-K-ATPase in intercalated cells of cortical collecting duct with chronic metabolic acidosis. 1996

R B Silver, and P A Mennitt, and L M Satlin

Department of Physiology, Cornell University Medical College, New York 10021, USA.

This study evaluated the role of H-K-adenosinetriphosphatase (H-K-ATPase) with chronic metabolic acidosis (CMA) in intercalated cells (ICs) of rabbit cortical collecting duct (CCD). CMA was induced by replacing drinking water with 75 mM NH4Cl in 5% sucrose for 10-14 days. CCDs isolated from CMA and control rabbits were split open and exposed to the intracellular pH (pHi) indicator 2',7'-bis(carboxyethyl)-5(6)-carboxyfluorescein. In N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid-buffered solutions, the resting pHi in ICs was similar for both groups. K-dependent pHi recovery (5 mM K, 140 mM N-methyl-D-glucamine) was monitored in response to a pulse of NH4Cl (10 mM). The K-dependent pHi recovery rate was threefold higher in CMAICs compared with controls and was abolished with the gastric H-K-ATPase inhibitor, Sch-28080 (10(-5) M). Polarity of the H-K-ATPase was studied in microperfused CMA and control CCDs. Luminal K-dependent pHi recovery was monitored in response to an acute pulse of NH4Cl in individual peanut lectin agglutinin (PNA)-binding ICs. The apical Sch-28080-inhibitable K-dependent pHi recovery rate was significantly greater in CMA ICs than control ICs. In summary, CMA enhances functional activity of an apical H-K-ATPase in PNA-binding ICs of rabbit CCD.

UI	MeSH Term	Description	Entries
D007685	Kidney Tubules, Collecting	Straight tubes commencing in the radiate part of the kidney cortex where they receive the curved ends of the distal convoluted tubules. In the medulla the collecting tubules of each pyramid converge to join a central tube (duct of Bellini) which opens on the summit of the papilla.	Kidney Collecting Ducts,Kidney Collecting Duct,Collecting Duct, Kidney,Collecting Ducts, Kidney
D011817	Rabbits	A burrowing plant-eating mammal with hind limbs that are longer than its fore limbs. It belongs to the family Leporidae of the order Lagomorpha, and in contrast to hares, possesses 22 instead of 24 pairs of chromosomes.	Belgian Hare,New Zealand Rabbit,New Zealand Rabbits,New Zealand White Rabbit,Rabbit,Rabbit, Domestic,Chinchilla Rabbits,NZW Rabbits,New Zealand White Rabbits,Oryctolagus cuniculus,Chinchilla Rabbit,Domestic Rabbit,Domestic Rabbits,Hare, Belgian,NZW Rabbit,Rabbit, Chinchilla,Rabbit, NZW,Rabbit, New Zealand,Rabbits, Chinchilla,Rabbits, Domestic,Rabbits, NZW,Rabbits, New Zealand,Zealand Rabbit, New,Zealand Rabbits, New,cuniculus, Oryctolagus
D002908	Chronic Disease	Diseases which have one or more of the following characteristics: they are permanent, leave residual disability, are caused by nonreversible pathological alteration, require special training of the patient for rehabilitation, or may be expected to require a long period of supervision, observation, or care (Dictionary of Health Services Management, 2d ed). For epidemiological studies chronic disease often includes HEART DISEASES; STROKE; CANCER; and diabetes (DIABETES MELLITUS, TYPE 2).	Chronic Condition,Chronic Illness,Chronically Ill,Chronic Conditions,Chronic Diseases,Chronic Illnesses,Condition, Chronic,Disease, Chronic,Illness, Chronic
D005260	Female		Females
D006863	Hydrogen-Ion Concentration	The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH	pH,Concentration, Hydrogen-Ion,Concentrations, Hydrogen-Ion,Hydrogen Ion Concentration,Hydrogen-Ion Concentrations
D000141	Acidosis, Renal Tubular	A group of genetic disorders of the KIDNEY TUBULES characterized by the accumulation of metabolically produced acids with elevated plasma chloride, hyperchloremic metabolic ACIDOSIS. Defective renal acidification of URINE (proximal tubules) or low renal acid excretion (distal tubules) can lead to complications such as HYPOKALEMIA, hypercalcinuria with NEPHROLITHIASIS and NEPHROCALCINOSIS, and RICKETS.	Renal Tubular Acidosis,Renal Tubular Acidosis, Type I,Renal Tubular Acidosis, Type II,Type I Renal Tubular Acidosis,Type II Renal Tubular Acidosis,Acidosis, Renal Tubular, Type I,Acidosis, Renal Tubular, Type II,Autosomal Dominant Distal Renal Tubular Acidosis,Classic Distal Renal Tubular Acidosis,Distal Renal Tubular Acidosis,Proximal Renal Tubular Acidosis,RTA, Classic Type,RTA, Distal Type, Autosomal Dominant,RTA, Gradient Type,RTA, Proximal Type,Renal Tubular Acidosis 1,Renal Tubular Acidosis I,Renal Tubular Acidosis II,Renal Tubular Acidosis, Distal, Autosomal Dominant,Renal Tubular Acidosis, Proximal,Renal Tubular Acidosis, Proximal, with Ocular Abnormalities,Classic Type RTA,Classic Type RTAs,Gradient Type RTA,Gradient Type RTAs,Proximal Type RTA,Proximal Type RTAs,RTAs, Classic Type,RTAs, Gradient Type,RTAs, Proximal Type
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D017506	H(+)-K(+)-Exchanging ATPase	An enzyme isolated from the GASTRIC MUCOSA that catalyzes the hydrolysis of ATP coupled with the exchange of hydrogen and potassium ions across the cell wall. This enzyme was formerly listed as EC 3.6.1.36.	ATPase, Hydrogen, Potassium,Adenosinetriphosphatase, Hydrogen, Potassium,H(+)-K(+)-Transporting ATPase,Hydrogen, Potassium ATPase,Hydrogen, Potassium, Adenosinetriphosphatase,Adenosine Triphosphatase, Hydrogen, Potassium,Gastric H(+) K(+) ATPase,Hydrogen, Potassium, Adenosine Triphosphatase,Hydrogen-Potassium-Exchanging ATPase,Potassium Hydrogen ATPase,ATPase Hydrogen, Potassium,ATPase, Hydrogen-Potassium-Exchanging,ATPase, Potassium Hydrogen,Hydrogen Potassium Exchanging ATPase