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J Biol Chem, Vol. 274, Issue 32, 22855-22861, August 6, 1999
Mouse Down-regulated in Adenoma (DRA) Is an Intestinal
Cl /HCO3 Exchanger and Is Up-regulated
in Colon of Mice Lacking the NHE3 Na+/H+
Exchanger
James E.
Melvin ,
Keerang
Park ,
Linda
Richardson ,
Patrick
J.
Schultheis§, and
Gary E.
Shull§
From the Center for Oral Biology, University of
Rochester School of Medicine and Dentistry, Rochester, New York 14642 and the § Department of Molecular Genetics, Biochemistry and
Microbiology, University of Cincinnati College of Medicine, Cincinnati,
Ohio 45267-0524
Mutations in human DRA cause congenital chloride
diarrhea, thereby raising the possibility that it functions as a
Cl /HCO3 exchanger. To test this
hypothesis we cloned a cDNA encoding mouse DRA (mDRA) and analyzed
its activity in cultured mammalian cells. When expressed in HEK 293 cells, mDRA conferred Na+-independent, electroneutral
Cl /CHO3 exchange activity. Removal of
extracellular Cl from medium containing
HCO3 caused a rapid intracellular alkalinization,
whereas the intracellular pH increase following Cl
removal from HCO3 -free medium was reduced greater
than 7-fold. The intracellular alkalinization in Cl -free,
HCO3 -containing medium was unaffected by removal of
extracellular Na+ or by depolarization of the membrane by
addition of 75 mM K+ to the medium. Like human
DRA mRNA, mDRA transcripts were expressed at high levels in cecum
and colon and at lower levels in small intestine. The expression of
mDRA mRNA was modestly up-regulated in the colon of mice lacking
the NHE3 Na+/H+ exchanger. These results show
that DRA is a Cl /HCO3 exchanger and
suggest that it normally acts in concert with NHE3 to absorb NaCl and
that in NHE3-deficient mice its activity is coupled with those of the
sharply up-regulated colonic H+,K+-ATPase and
epithelial Na+ channel to mediate electrolyte and fluid absorption.
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.

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H. Lohi, S. Makela, K. Pulkkinen, P. Hoglund, M.-L. Karjalainen-Lindsberg, P. Puolakkainen, and J. Kere
Upregulation of CFTR expression but not SLC26A3 and SLC9A3 in ulcerative colitis
Am J Physiol Gastrointest Liver Physiol,
September 1, 2002;
283(3):
G567 - G575.
[Abstract]
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H. Lohi, M. Kujala, S. Makela, E. Lehtonen, M. Kestila, U. Saarialho-Kere, D. Markovich, and J. Kere
Functional Characterization of Three Novel Tissue-specific Anion Exchangers SLC26A7, -A8, and -A9
J. Biol. Chem.,
April 12, 2002;
277(16):
14246 - 14254.
[Abstract]
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K. Kunzelmann and M. Mall
Electrolyte Transport in the Mammalian Colon: Mechanisms and Implications for Disease
Physiol Rev,
January 1, 2002;
82(1):
245 - 289.
[Abstract]
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D. Sterling, R. A. F. Reithmeier, and J. R. Casey
A Transport Metabolon. FUNCTIONAL INTERACTION OF CARBONIC ANHYDRASE II AND CHLORIDE/BICARBONATE EXCHANGERS
J. Biol. Chem.,
December 14, 2001;
276(51):
47886 - 47894.
[Abstract]
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Z. Spicer, L. L. Clarke, L. R. Gawenis, and G. E. Shull
Colonic H+-K+-ATPase in K+ conservation and electrogenic Na+ absorption during Na+ restriction
Am J Physiol Gastrointest Liver Physiol,
December 1, 2001;
281(6):
G1369 - G1377.
[Abstract]
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S. Tyagi, R. J. Kavilaveettil, W. A. Alrefai, S. Alsafwah, K. Ramaswamy, and P. K. Dudeja
Evidence for the Existence of a Distinct SO4---OH- Exchange Mechanism in the Human Proximal Colonic Apical Membrane Vesicles and Its Possible Role in Chloride Transport
Experimental Biology and Medicine,
November 1, 2001;
226(10):
912 - 918.
[Abstract]
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T. Greeley, H. Shumaker, Z. Wang, C. W. Schweinfest, and M. Soleimani
Downregulated in adenoma and putative anion transporter are regulated by CFTR in cultured pancreatic duct cells
Am J Physiol Gastrointest Liver Physiol,
November 1, 2001;
281(5):
G1301 - G1308.
[Abstract]
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K.-H. Lee, C. Finnigan-Bunick, J. Bahr, and D. Bunick
Estrogen Regulation of Ion Transporter Messenger RNA Levels in Mouse Efferent Ductules Are Mediated Differentially Through Estrogen Receptor (ER) {alpha} and ER{beta}
Biol Reprod,
November 1, 2001;
65(5):
1534 - 1541.
[Abstract]
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D. Markovich
Physiological Roles and Regulation of Mammalian Sulfate Transporters
Physiol Rev,
October 1, 2001;
81(4):
1499 - 1533.
[Abstract]
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W. A. Alrefai, S. Tyagi, F. Mansour, S. Saksena, I. Syed, K. Ramaswamy, and P. K. Dudeja
Sulfate and chloride transport in Caco-2 cells: differential regulation by thyroxine and the possible role of DRA gene
Am J Physiol Gastrointest Liver Physiol,
April 1, 2001;
280(4):
G603 - G613.
[Abstract]
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M. Soleimani, T. Greeley, S. Petrovic, Z. Wang, H. Amlal, P. Kopp, and C. E. Burnham
Pendrin: an apical Cl{-}/OH{-}/HCO3{-} exchanger in the kidney cortex
Am J Physiol Renal Physiol,
February 1, 2001;
280(2):
F356 - F364.
[Abstract]
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V. M. Rajendran, J. Black, T. A. Ardito, P. Sangan, S. L. Alper, C. Schweinfest, M. Kashgarian, and H. J. Binder
Regulation of DRA and AE1 in rat colon by dietary Na depletion
Am J Physiol Gastrointest Liver Physiol,
November 1, 2000;
279(5):
G931 - G942.
[Abstract]
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L. L. Clarke, M. C. Harline, L. R. Gawenis, N. M. Walker, J. T. Turner, and G. A. Weisman
Extracellular UTP stimulates electrogenic bicarbonate secretion across CFTR knockout gallbladder epithelium
Am J Physiol Gastrointest Liver Physiol,
July 1, 2000;
279(1):
G132 - G138.
[Abstract]
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V. J. Wheat, H. Shumaker, C. Burnham, G. E. Shull, J. R. Yankaskas, and M. Soleimani
CFTR induces the expression of DRA along with Cl-/HCO3- exchange activity in tracheal epithelial cells
Am J Physiol Cell Physiol,
July 1, 2000;
279(1):
C62 - C71.
[Abstract]
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G. E. Shull, M. L. Miller, and P. J. Schultheis
Lessons from Genetically Engineered Animal Models. VIII. Absorption and secretion of ions in the gastrointestinal tract
Am J Physiol Gastrointest Liver Physiol,
February 1, 2000;
278(2):
G185 - G190.
[Abstract]
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R. L. Evans, K. Park, R. J. Turner, G. E. Watson, H.-V. Nguyen, M. R. Dennett, A. R. Hand, M. Flagella, G. E. Shull, and J. E. Melvin
Severe Impairment of Salivation in Na+/K+/2Cl- Cotransporter (NKCC1)-deficient Mice
J. Biol. Chem.,
August 25, 2000;
275(35):
26720 - 26726.
[Abstract]
[Full Text]
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Z. Wang, S. Petrovic, E. Mann, and M. Soleimani
Identification of an apical Cl-/HCO3- exchanger in the small intestine
Am J Physiol Gastrointest Liver Physiol,
March 1, 2002;
282(3):
G573 - G579.
[Abstract]
[Full Text]
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Copyright © 1999 by the American Society for Biochemistry and Molecular Biology.
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