The role of renal proximal tubule transport in the regulation of blood pressure

The electrogenic sodium/bicarbonate cotransporter 1 (NBCe1) on the basolateral side of the renal proximal tubule plays a pivotal role in systemic acid-base homeostasis. Mutations in the gene encoding NBCe1 cause severe proximal renal tubular acidosis accompanied by other extrarenal symptoms. The proximal tubule reabsorbs most of the sodium filtered in the glomerulus, contributing to the regulation of plasma volume and blood pressure. NBCe1 and other sodium transporters in the proximal tubule are regulated by hormones, such as angiotensin II and insulin. Angiotensin II is probably the most important stimulator of sodium reabsorption. Proximal tubule AT(1A) receptor is crucial for the systemic pressor effect of angiotensin II. In rodents and rabbits, the effect on proximal tubule NBCe1 is biphasic; at low concentration, angiotensin II stimulates NBCe1 via PKC/cAMP/ERK, whereas at high concentration, it inhibits NBCe1 via NO/cGMP/cGKII. In contrast, in human proximal tubule, angiotensin II has a dose-dependent monophasic stimulatory effect via NO/cGMP/ERK. Insulin stimulates the proximal tubule sodium transport, which is IRS2-dependent. We found that in insulin resistance and overt diabetic nephropathy, stimulatory effect of insulin on proximal tubule transport was preserved. Our results suggest that the preserved stimulation of the proximal tubule enhances sodium reabsorption, contributing to the pathogenesis of hypertension with metabolic syndrome. We describe recent findings regarding the role of proximal tubule transport in the regulation of blood pressure, focusing on the effects of angiotensin II and insulin.

Nutritional status of calcium and other bone-related nutrients in Japanese type 2 diabetes patients

OBJECTIVE: Traditional Japanese food appears to be healthy but contains a small amount of milk products. Type 2 diabetes (T2DM) patients commonly reduce their energy intake to control their blood glucose levels. However, nutritional guidance for diabetes does not emphasize calcium (Ca) consumption. The aim of this study is to estimate the nutritional status of Ca and other nutrients, which affect bone and Ca metabolism, in T2DM patients. METHODS: This observational study was conducted with Japanese T2DM patients (n = 96; M/F = 50/46; age: 61.6 ± 10.1 years). We estimated nutrient intake using a simple food frequency questionnaire. RESULTS: Median total energy intake was 1750 kcal/day (1440-1970). Their median daily intake of Ca, vitamin D, and vitamin K was 451 mg (336-560), 10.2 µg (8.5-12), and 206 µg (84-261), respectively. Only 17.7% of the study subjects were found to take more than 600 mg/day of Ca. Protein and salt intake was 78 (64-90) and 10.6 (9.3-12.2) g/day, respectively. Male subjects had more salt, less Ca and vitamin K than female. Daily Ca intake was positively associated with total energy, protein, and lipid intake but not with carbohydrates. Vitamin D intake correlated only with protein intake. CONCLUSION: The daily Ca intake of Japanese T2DM patients appears to be insufficient and could depend on protein and lipid intake. Additionally, these patients should have specific recommendations to ensure sufficient intake of Ca with protein and lipid during energy restriction.

Construction Case with an Electronic Hospital Formulary to Be Able to Do Rapid Retrieval Using a Portable Terminal iPhone® / 医薬品情報学

<b>Objective: </b>The hospital is changing its formulary reference from paper-based to intranet.  There was concern that both paper-based and intranet versions of the formulary would be necessary.  Revising the paper-based hospital formulary each time package inserts are revised is difficult.  For your review we report on the creation of the iPhone® electronic formulary which enables rapid off-line formulary retrieval and easy updates while at the same time providing low cost service in a light device.<br><b>Methods: </b>The CSV (Comma Separated Value) of the hospital formulary dictionary was made using a standard personal computer.  The CSV data file was converted using JAMES2DIC into a HTML file format.  Next, the converted HTML file is transformed into the EPWING (Electronic Publishing WING) format using EBStudio.  Finally, we forward the EPWING dictionary file from the personal computer to the iPhone®.  The retrieval becomes possible by using EBPocket for iOS of EPWING/electronic book viewer software for the iPhone®.  The number of items was assumed to be 29 items thought for a lot of inquiries to exist.<br><b>Results: </b>We compared the paper-based formulary with the iPhone® electronic formulary.  As a result, the iPhone4® electronic formulary shortened the retrieval time, was smaller, lighter, and excellent at a lower price.<br><b>Conclusion: </b>The iPhone4® electronic formulary enables the user to perform complex full-text searches and retrieve information at a much higher speed than is possible with paper based formularies.  It has the additional advantage of seamless integration and deployment of formulary additions or reference material revisions.  We believe we have successfully created a practical electronic formulary.

Bicarbonate transport in microperfused pancreatic ducts

No abstract available.

Serotonin and pancreatic duct function

1. 5-HT inhibits spontaneous fluid secretion as well as stimulated secretion with secretin (cAMP mediated) or ACh (Ca2+ mediated) in the isolated guinea pig pancreatic ducts. 2. The inhibitory effect of 5-HT is reversible and is dependent on the concentration in the range 0.01-0.1 microM, which is much lower than those that affect intestinal motility and secretion. 3. The 5-HT3 receptor in duct cells appears to mediate the inhibitory effect of 5-HT. 4. [Ca2+]i is unlikely to mediate the inhibitory effect of 5-HT.