Liaison Jack Reams, see Finance. No report submitted. Latin American: Chair Lidia Gaivironsky, 5411 ; 4 503-3106, gaivi sion Liaison Luis Brenes, lbrenes racsa.co.cr + 506-226-1681. After the AGM in Costa Rica, the Latin American Committee had a meeting to establish new guides of action. Now, the Committee is working on them, with the goal to elaborate on a document to be sent to the Board. As in other opportunities, this meeting allowed us to be better every day, as professionals, on a personal level, and to re-affirm our organic ethics and conduct. Membership: Chair Chris Kidwell 530628-4560, ckidwell tcoek12 , Liaison Garry Lean, see Bylaws. No report submitted. See membership update, page 2. Scholarship: Chair Nancy Ludwig, 503588-5446, nancyludwig comcast Liaison Ann Baier, see TOC. The committee seeks to fill its one vacant seat. Ideally, we hope to find a Spanishspeaking member from outside of the US and Canada to facilitate the community initiative CIS ; scholarship review and selection. ; We updated the scholarship forms in the IOIA office and on the web site to assure that the most current forms would be used for the applicants for this coming year. Training: Chair Janine Gibson, 204434-6018, Janine mb.sympatico Liaison Ann Baier, see TOC No report submitted. Training Oversight Committee: Chair Harriet Behar, harrieta mwt Liaison Ann Baier, ahbaier aol 831-426-2052. Ongoing, approving trainings and TC's. The TOC continues with its ongoing work of interfacing with Lisa Pierce, regional training coordinator, and giving input and approval for upcoming IOIA trainings as well as the Training Coordinators that are chosen to lead those trainings. The six members of the committee, Ann Baier, Janine Gibson, Billy Hunter, Chip Kraynyk, Rick Martinez and myself, Harriet Behar ask Lisa questions and give Lisa a place to work through possible issues with group of knowledgeable individuals. All work is done via email.
Detecting receptor presence than a single-point progesterone receptor assay described by Pichon and Milgrom [Cancer Res. 37, 464 1977 ; ], fromwhich it was derived. Compared to the six-point assay, this two-point assay can be used to assay smallersamples and, with positive and negative controls included, process more samples ina run. Cytosol with 4 g of protein per liter is treated separately and in triplicate with two concentrations 4 pmol liter and 20 nmol liter ; f [3H]progesterone combined with hyo drocortisol, 1 tmol liter, nthe absence and presence of i unlabeled progesterone, 2 tmol liter. After a 2-h incubation at 5 # C, glycerin is added toprovide300 mI liter during a second 2-h incubation 5 # C ; . Bound and free proges.
Perhaps a misunderstanding was created by my reference to the World Health Organization's definition of palliative care: "the active total care . of patients whose disease is not responsive to curative treatment." Taken literally, these words might be interpreted to mean that the care of all patients with chronic diseases is properly characterized as palliative. But my personal concept of palliative care is not nearly so broad. Rather, in my view, the palliative care model is applied most.
In a population of neonates receiving bumetanide for volume overload, mean serum clearance rates were 17 ml min kg in patients less than 2 months of age and 8 ml min kg in patients aged 2 to 6 months.
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Al-Sharif, W. Z., Sunyer, J. O., Lambris, J. D. and Smith, L. C. 1998 ; . Sea urchin coelomocytes specifically express a homologue of the complement component C3. J. Immunol. 160, 29832897. Canicatti, C., Pagliara, P. and Stabili, L. 1992 ; . Sea urchin coelomic fluid agglutinin mediates coelomic adhesion. Eur. J. Cell Biol. 58, 291295. Cantiello, H. F., Stow, J. L., Pratt, A. G. and Ausiello, D. A. 1991 ; . Actin filaments regulate epithelial Na + channel activity. Am. J. Physiol. 261, C882C888. Coffaro, K. A. and Hinegardner, R. 1977 ; . Immune response in the sea urchin Lytechinus pictus. Science 197, 13891390. Coleman, R. A. and Wade, J. B. 1992 ; . Role of nonacidic endosomes in recycling of ADH-sensitive water channel structures. Eur. J. Cell Biol. 58, 4456. D'Andrea, L., Danon, M. A., Sgourdas, G. P. and Bonder, E. M. 1994 ; . Identification of coelomocyte unconventional myosin and its association with in vivo particle vesicle motility. J. Cell Sci. 107, 20812094. D'Andrea, L., Lytle, C., Mathews, J., Hofman, P., Forbush, B. and Madara, J. L. 1996 ; . Na: K: 2Cl cotransporter NKCC ; of intestinal epithelial cells: surface expression in response to cAMP. J. Biol. Chem. 271, 2896928976. Dharmsathaphorn, K., Mandel, K. G., Masui, H. and McRoberts, J. A. 1985 ; . Vasoactive intestinal peptide-induced chloride secretion by a colonic epithelial cell line: direct participation of a basolaterally localized Na + K 2Cl- cotransport system. J. Clin. Invest. 75, 462471. Edds, K. 1980 ; . The formation of filopodia during transformation of sea urchin coelomocytes. Cell Motil. 1, 131140. Endean, R. 1966 ; . The coelomocytes. In Physiology of Echinodermata ed. R. A. Boolootian ; , pp. 301328. New York: J. Wiley & Sons. Feit, P. W., Hoffman, E. K., Schiodt, M., Kristensen, P., Jessen, F. and Dunham, P. B. 1988 ; . Purification of proteins of the Na Cl cotransporter from membranes of Ehrlich ascites cells using a bumetanideSepharose affinity column. J. Membr. Biol. 103, 135147. Gagnon, F., Hamet, P. and Orlov, S. N. 1999 ; . Na + pump and Na + coupled ion carriers in isolated mammalian kidney epithelial cells: regulation by protein kinase C. J. Physiol. Pharmac. 77, 305319. Haas, M. and Forbush, B. 1986 ; . 3H bumetanide binding to duck and buprenorphine.
Speed on new developments. A big thank you to all of you who play a huge role in providing peer support. Also sincere thanks to the facilitators who give their time and keep that link between families and the mental health services.
And perhaps it is right that our empirical, fragmentary, differently labelled transport `system' should be returning, that we are now tussling with the prospect of a private-public mix for the Underground and for the inevitable disintegration of corporate identity, corporate livery that it will bring. We are right to be empirical, practical, non-corporate in our thinking. We are by temperament simply not given to abstraction, especially about an entity so incontrovertibly tangible as the City. English readers might, for example, well find extracts such as the following a little disconcerting: Jonathan Raban in his classic Soft City writes and buspirone.
| Bumetanide manufacturerMM K -gluconate, 1.8 mM Ca2 gluconate, 1.0 mM Mg-gluconate, and 5.0 mM HEPES Tris, pH 7.4 ; for the fourth day. Chloride-free incubation was done to reduce cell Cl activity, thus increasing the driving force for tracer uptake. 22Na uptake was assessed in individual oocytes 4 d after injection using the following protocol: a 30-min incubation in a Cl -free ND96 medium 96.0 mM Na gluconate, 2.0 mM K -gluconate, 6.0 mM Ca2 -gluconate, 1.0 mM Mg-gluconate, and 5.0 mM HEPES Tris, pH 7.4 ; containing ouabain 1 mM ; , amiloride 0.1 mM ; , and bumetanide 0.1 mM ; , followed by a 60-min uptake period in a K -free, NaCl medium 80.0 mM NaCl, 16.0 mM Na-gluconate, 1.8 mM CaCl2, 1.0 mM MgCl2, and 5.0 mM HEPES Tris, pH 7.4 ; , containing ouabain, amiloride, bumetanide, and 2.5 Ci of 22Na per ml NEN ; . Ouabain was added to prevent 22Na exit via Na -K -ATPase and amiloride to prevent 22Na uptake via Na channels or Na H antiport. Removal of extracellular K and addition of bumetanide to the uptake medium prevented 22Na uptake via the Na -K -2Cl cotransporter endogenously expressed in oocytes 3 ; . This same protocol was followed for 22Na uptakes of EGFP-tagged wild-type and mutant cotransporters. To determine the Cl -dependent fraction of 22Na uptake, paired groups of oocytes were incubated in uptake media with Cl as above ; or without Cl 96.0 mM Na -gluconate, 6.0 mM Ca2 -gluconate, 1.0 mM Mggluconate, and 5.0 mM HEPES Tris, pH 7.4 ; . For kinetic analysis, uptakes were performed with a fixed concentration of Na or mM, with changing concentrations of counterion from 0 to 20 for Na and 0 to 40 for Cl . NMDG was used as Na substitute and gluconate as a Cl substitute to maintain osmolality and ionic strength. Thiazide sensitivity was assessed by measuring Na uptake in paired groups of oocytes with or without metolazone 0.1 mM ; in the incubation and uptake medium. The IC50 of the cotransporters to metolazone was determined by exposing groups of rNCC cRNAinjected oocytes to the diuretic at concentrations varying from 10 9 to The diuretic was present in both the incubation and uptake periods. All experiments were performed at 32C.
Volume changes; i.e., initial cell swelling followed by RVD 25 ; . Because RVD is associated with a drastic decrease in cytosolic Cl concentration, we examined the possible role of cytosolic Cl in regulating Na reabsorption and -ENaC mRNA expression. Generally, the cytosolic Cl concentration is determined by the balance between Cl uptake through the Na -K -2Cl cotransporter at the basolateral membrane and Cl secretion through Cl channels at the apical membrane. This implies that cytosolic Cl concentration will increase when Cl secretion is inhibited by Cl channel blockers such as NPPB and will decrease when Cl uptake is blocked by inhibitors of the Na -K -2Cl cotransporter such as bumetanide. In response to hypotonicity, if KCl release is blocked by the chloride channel blocker NPPB, the decrease in cytosolic Cl concentration associated with RVD would be impaired and the cytosolic Cl concentration would remain at a level higher than without NPPB treatment. Therefore, we examined the effect of NPPB on the changes in -ENaC mRNA expression induced by hypotonic media. For these experiments, cells were incubated in an isotonic culture medium containing 100 M NPPB for 30 min. Then, the media was changed to either an isotonic or a hypotonic culture medium containing 100 M NPPB for 24 h for a total exposure to 100 M NPPB of 24 h min ; . Treatment with NPPB suppressed the -ENaC mRNA expression under both isotonic and hypotonic conditions Fig. 3, A and C ; . This result suggests that the increased cytosolic Cl concentration produced by NPPB treatment suppressed basal isotonic ; and hypotonicity-induced -ENaC mRNA expression and that cytosolic Cl plays a key role in the regulation of -ENaC mRNA expression. On the other hand, to study effects of the decreased cytosolic Cl concentration on -ENaC mRNA expression, we used a blocker of the Na K -2Cl cotransporter bumetanide to reduce cytosolic Cl concentration. Under the isotonic basal ; conditions, treatment with bumetanide increased -ENaC mRNA expression Fig. 3, B and C ; . However, bumetanide did not affect the hypotonicity-induced -ENaC mRNA expression Fig. 3, B and C ; . This is consistent with the observation described above Fig. 2C ; that there is no measurable NPPB-sensitive Isc in hypotonic media despite the fact that hypotonicity increased NPPBsensitive Gt above that in isotonic solution Fig. 2D ; . This indicates that the apical Cl channels are functional under the hypotonic condition even though there is no transcellular Cl transport. Taken together, these observations suggest that the elimination of transcellular Cl transport under hypotonic conditions is due to a reduction in activity of the bumetanidesensitive Na -K -2Cl cotransporter. If the Na -K -2Cl cotransporter is inactive, then bumetanide will have no effect on cytosolic Cl concentration and will also have no effect on -ENaC mRNA expression under the hypotonic conditions. On the other hand, under the isotonic conditions, bumetanide blocks a functional cotransporter and slightly decreases cytosolic Cl concentration, which induced -ENaC mRNA expression. As mentioned above, treatment with NPPB for 24 h significantly diminished the expression of -ENaC mRNA. Therefore, we examined whether NPPB also reduces the hypotonicity-stimulated Na reabsorption. NPPB of 100 M after which treatment of A6 cell monolayers for 24 h markedly decreased the hypotonicity-induced, benzamil-sensitive Isc Fig. 4A ; and benzamil-sensitive Gt Fig. 4B however, treatment with bu ajprenal and busulfan.
Genericmedlist home legal med list equivalents antibiotics help us pdf list sitemap « levothyroxine buspirone tablets » bumetanide tablets 5, 1mg bumetanide bumex ; tablets bumetanide is a loop diuretic used to treat edema, hypertension, and other medical conditions.
| Likely to be salt-sensitive, so they respond well to these drugs. ; They also work well for patients with diabetes. Results from the long-term Antihypertensive and LipidLowering Treatment to Prevent Heart Attack Trial ALLHAT ; , published in the Journal of the American Medical Association in 2005, confirm that thiazide-type diuretics should be the first treatment option for most patients with hypertension. The landmark trial included over 33, 000 patients 35% black ; with hypertension and at least one other cardiovascular risk factor. Patients were randomized to receive a calcium channel blocker, an ACE inhibitor, or a thiazide-type diuretic. Results suggested that the diuretic worked just as well as the newer drugs in lowering blood pressure and was more effective in preventing heart failure, heart attack, and stroke. The benefits for the diuretic were even more significant for African-American patients. Other trial results indicated that patients taking the calcium channel blocker had the greatest risk for heart failure, and that the ACE inhibitor was much less effective than the diuretic in lowering blood pressure and preventing stroke in African-American patients. Diuretic Types and Brands. There are many brands of diuretics. They are generally inexpensive. Some need to be taken once a day, some twice a day. Low doses are usually as effective for lowering blood pressure as higher doses. Diuretics are usually used in combination with other drugs, especially ACE inhibitors and beta blockers. There are three main types of diuretics: Potassium-sparing diuretics. These include amiloride Midamor ; , spironolactone Aldactone ; , and triamterene Dyrenium ; . Thiazide diuretics. These include chlorothiazide Diuril ; , chlorthalidone Hygroton ; , indapamide Lozol ; , hydrochlorothiazide Esidrix, HydroDiuril ; , and metolazone Mykrox, Zaroxolyn ; . Loop diuretics. Because loop diuretics act faster than other diuretics it is important to avoid dehydration and potassium loss. Loop diuretics include bumetanide Bumex ; , furosemide Lasix ; , and torsemide Demadex ; . Benefits of Diuretics. Diuretics can: Reduce the risk for stroke Reduce the risk for heart attack and heart failure Protect against blood clots. Problems with Diuretics. Loop and thiazide diuretics reduce the body's supply of potassium, which, if left untreated, increases the risk for arrhythmias. Arrhythmias are heart rhythm disturbances that can, in rare instances, lead to cardiac arrest. In such cases, doctors will prescribe lower doses of the current diuretic, recommend potassium supplements, or use potassium-sparing diuretics either alone or in combination with a thiazide. Potassium-sparing drugs have their own risks, which include dangerously high levels of potassium in people with existing elevated levels of potassium or in those with damaged kidneys. However, all diuretics are generally more beneficial than harmful. Common Diuretic Side Effects: Fatigue Depression and irritability Urinary incontinence Reduced sexual drive Beta-Blockers Beta-blockers help slow heart rate and lower blood pressure. They are usually used in combination with other drugs such as ACE inhibitors and diuretics. Brands. Propranolol Inderal ; , acebutolol Sectral ; , atenolol Tenormin ; , betaxolol Kerlone ; , carteolol Cartrol ; , metoprolol Lopressor ; , nadolol Corgard ; , penbutolol Levatol ; , pindolol Visken ; , carvedilol Coreg ; , and timolol Blocadren ; . The drugs may differ in their effects and benefits. Problems with Beta-Blockers. Evidence presented at the 2005 meeting of the American College of Cardiology suggested that an ACE-inhibitor combined with a calcium channel blocker works just as well as a beta-blocker-diuretic combination in treating hypertension, and poses less risk of diabetes. Other recent studies suggest that beta-blockers may increase the risk of stroke, and should not be a firstline choice for high blood pressure treatment. Do not abruptly stop taking these drugs. The sudden withdrawal of beta blockers can rapidly increase heart rate and blood pressure. The doctor may want the patient to slowly decrease the dose before stopping completely. Beta blockers are categorized as non-selective or selective. Non-selective beta blockers such as carvedilol and propranolol may sometimes narrow bronchial airways. These beta blockers should not be used by patients with asthma, emphysema, or chronic bronchitis. Beta blockers can lower HDL "good" ; cholesterol. These drugs can hide warning signs of low blood sugar hypoglycemia ; in patients with diabetes. When combined with a diuretic, the risk of diabetes may be increased. Common Side Effects Fatigue and lethargy Vivid dreams and nightmares Depression Memory loss Dizziness and lightheadedness Reduced ability to exercise Coldness in extremities legs, toes, arms, hands ; Check with your doctor about any side effects. Do not stop taking these drugs on your own. ACE Inhibitors Angiotensin-converting enzyme ACE ; inhibitors open blood vessels and decrease the workload of the heart. They are used to treat high blood pressure but can also help improve heart and lung muscle function. These drugs are particularly important for patients with diabetes. A large study reported that patients with diabetes who took these drugs had fewer heart attacks and lower overall mortality rates than patients who took other types of high blood pressure medications. ACE inhibitors may also help slow progression of kidney disease, in addition to controlling blood pressure. They may also be better at preventing the development of diabetes in patients with kidney disease than other types of blood pressure medication. In a 2006 study of African-American patients with high blood pressure and kidney disease, patients who took an ACE inhibitor had a lower risk of developing diabetes than those who took a calcium channel blocker or betablocker drug and butorphanol.
Abomasal infusion of L-carnitine affects metabolic and production responses to feed restriction in lactating Holstein cows. D. B. Carlson * 1, H. M. Dann1, N. B. Litherland1, J. C. Woodworth2, J. K. Drackley1; 1University of Illinois, Urbana, 2Lonza, Inc., Fair Lawn, NJ Cholesystokinin mediates intake regulation of high fat diets in ruminants by acting on the reticuloomasal sphincter. Devendra Kumar1, Mark A. Froetschel * 1, T. Dean Pringle1, Duane, H. Keisler2; 1 The University of Georgia, Athens, 2University of Missouri, Columbia Effect of Feeding Ca Salts of Palm Oil PO ; or a Blend of Linoleic and Monoenoic Trans Fatty Acids LTFA ; on Uterine Involution and Reproductive Performance in Holstein Cows. S.O. Juchem * 1, R.L.A. Cerri1, R. Bruno1, K.N. Galvao1, E.W. Lemos1, M. Villasenor1, A.C. Coscioni1, H.M. Rutgliano1, W.W. Thatcher2, D. Luchini3, J.E.P. Santos1; 1University of California, Davis, 2University of Florida, 3 Bioproducts, Inc. Responses of milk fat composition to dietary non-fiber carbohydrates in Sarda dairy sheep. A. Nudda * , S. Fancellu, F. Porcu, F. Boe, A. Cannas; Dipartimento di Scienze Zootecniche, University of Sassari, Italy Nutritional properties and use of rumen protected oilseed conjugated linoleic acid CLA ; supplements. S.K. Gulati * 1, S.W. McGregor2, T.W. Scott2; 1Sydney University, Australia, 2Rumentek Pty Ltd, Australia.
Manager of FinHestia SARL Luxembourg ; since 2003. She was legal manager of Audibert-Beaufour SARL France ; until 2003 and she has been co-manager of Stef Audibert-Beaufour since 1994. Anne Beaufour has been a director of the Company since 1998, when she already held other positions with Group subsidiaries. Henri Beaufour Henri Beaufour, 42, holds a bachelor of arts degree Georgetown, University of Washington DC, United States ; . Since 2003, he has been legal manager of Camilia Holding Luxembourg ; , Beech Tree SARL Luxembourg ; and FinHestia SARL Luxembourg ; . Over the past decade, he has held various positions with the Group's international subsidiaries. Henri Beaufour has been a director of the Company since 2000. Alain Bguin Alain Bguin, 59, joined the Group in 1975 as Head of Exports for Laboratoires Beaufour. Subsequently, he was general secretary of Laboratoires Beaufour, deputy CEO of SCRAS and general secretary of the Group until 1999. Previously, he worked for Bank of America. Alain Bguin is currently secretary of Mayroy's board of directors and co-legal manager of Beech Tree SARL, as well as working for an asset management organisation consultancy. Herv Couffin Herv Couffin, 55, is Chairman and chief executive officer of Callisto, a consultancy advising management teams on LBOs, and sits on the board of directors of several other companies Carbone Lorraine, Neuf Cegetel, Antargaz ; . From 1998 to 2004, he was a member of the executive committee and senior partner at PAI Partners. Previously, he worked for Paribas for a period of 15 years. Herv Couffin is a graduate of the cole Polytechnique and a member of the prestigious Corps des Mines of elite French engineers. Antoine Flochel Antoine Flochel, 42, is currently legal manager of VicJen Finance and Vice-Chairman of the Company's Board of Directors. He is a managing director and chairman of the board of Mayroy and legal manager of Beech Tree and Senior Adviser of Bryan Garnier & Co. He worked for Coopers & Lybrand Corporate Finance now PricewaterhouseCoopers Corporate Finance ; from 1995 to 2005 and was made a partner in 1998. Antoine Flochel is a graduate of the IEP institute of political studies ; in Paris, holds a law degree and a postgraduate degree in economics of Paris Dauphine University, as well as an MSc in finance from the London School of Economics and byetta.
NECESSARY CULTURAL REFERENCES In African-American women, life expectancy at 65 years of age is approximately how many more years? A ; 3 B ; Obviously, the ethnicity component of this question is vital to the teaching point.
Of the cation-chloride cotransporters beyond the identification of phosphorylated residues involved in transport activation. For other transporters, mutational analysis has generally supported the hypothesis that residues in predicted transmembrane helices mediate solute translocation, whereas hydrophilic domains may be important through allosteric interactions. For instance, Noel and Pouyssegur 20 ; showed that the Na -H exchanger is able to carry out antiport activity without its N- or C-terminal hydrophilic domains 19 ; , but that the N-terminal domain is necessary for allosteric activation by intracellular acidification 20 ; . Similarly, mutants of the Na-Ca exchanger that lack the large cytosolic domain between helix 6 and 7 are no longer regulated by free Ca2 but retain transport activity 21 ; . However, in some cases, allosteric interactions may be manifested as changes in ion affinity, as illustrated by the finding that modification of the cytoplasmic domain of the Na pump 22 ; results in changes in affinity for translocated K . Here we report the use of chimeras to explore the roles of the N terminus, C terminus, and transmembrane domain in ion and bumetanide binding by NKCC1. The analysis of chimeras between similar forms of a membrane protein is a powerful strategy to determine the role of the large structural domains. The exchange of regions between evolutionarily related carriers results in many conservative amino acid substitutions and is a rapid method to define important functional regions. As an alternative to selection of individual point mutations or deletion analysis, chimeras offer the advantage of determining the role of intact domains and limiting disruption in protein folding. In this study we have begun to localize regions of NKCC1 responsible for ion and bumetanide binding, taking advantage of the fact that although the shark and human transporters are 74% identical, the Km for Na , K , and Cl and the Ki for bumetanide are 4 6-fold higher in sNKCC1 compared with hNKCC1 6 ; . Functional analysis of these chimeras demonstrates that it is the central segment containing the transmembrane helices that specifies the kinetic characteristics of the NKCC proteins and that the cytoplasmic N and C termini have little if any role in determining the species differences in ion and inhibitor binding. A preliminary report has been presented 23 and campral.
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SHPT generally is associated with abnormally high rates of bone resorption and is often accompanied by pain and fractures 14 16 ; . Extraskeletal manifestations of the disease include vascular calcification, hypertension, anemia, pruritus, and sexual dysfunction 1725 ; . Analyses of data from large hemodialysis cohorts 13 ; have demonstrated significant relations among elevated PTH, Ca, and P and mortality and morbidity. Block et al. 3 ; showed that PTH concentrations 600 pg ml were associated with an increase in the risk for death compared with PTH concentrations 600 pg ml; higher PTH was also associated with higher risks for cardiovascular disease and fracture. In the same analysis, hyperphosphatemia was strongly associated with mortality, cardiovascular disease, and fracture; hypercalcemia was also associated with mortality 3 ; . The K DOQI treatment guidelines provide recommended target levels for PTH 150 to 300 pg ml ; , serum Ca 8.4 to 9.5 mg dl ; , P 3.5 to 5.5 mg dl ; , and Ca P 55 mg2 dl2 ; 6 ; . Observational studies have shown that being "in range" is associated with enhanced survival 3, 5 ; . Although treatment of SHPT is often aimed at the achievement of these goals, to date, no interventional studies have demonstrated that achievement of and camptosar.
The effect of nucleoside on Na reabsorption via Na nucleoside cotransporter in cultured rat epididymal epithelia was studied by short-circuit current Isc ; technique. Guanosine added apically stimulated Isc in a dose-dependent manner, with a median effective concentration EC50 ; of 7 2 mean SEM ; . Removal of Na from the apical bathing solution or pretreatment with a nonspecific Na nucleoside cotransporter inhibitor, phloridzin, completely blocked the Isc response to guanosine. Moreover, the guanosine response was abolished by pretreatment of the tissue with ouabain, a Na K -ATPase inhibitor, suggesting the involvement of Na nucleoside cotransporter on the apical side and Na K -ATPase on the basolateral side in Na reabsorption. In contrast, the Isc response to guanosine was not affected after desensitization of purinoceptors by ATP. Addition of the Na K 2Cl symport inhibitor bumetanide to the basolateral side or the nonspecific Cl channel blocker diphenylamine-2-carboxylate to the apical side showed no effect on the Isc response to guanosine, excluding stimulation of Cl secretion by guanosine as the cause of the guanosine-induced Isc. The Isc response to purine nucleoside guanosine and inosine ; was much higher than that to pyrimidine nucleoside thymidine and cytidine ; . Consistent with substrate specificity, results of reverse transcription-polymerase chain reaction revealed mRNA for concentrative nucleoside transporter CNT2 ; , which is a purine nucleoside-selective Na nucleoside cotransporter in the epididymis, but not for CNT1. It is suggested that the Na nucleoside cotransporter i.e., CNT2 ; may be one of the elements involved in Na and fluid reabsorption in the epididymis, thereby providing an optimal microenvironment for the maturation and storage of spermatozoa.
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