David C. Leppla

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Bone density (bone mineral content/bone width) was determined by iodine-125 (125I)-photon absorptiometry in the distal third of the radius before and after successful parathyroidectomy in 37 patients with primary hyperparathyroidism. Bone density progressively declined during the two years immediately preceding surgery. It rose by 6.4% during the first year(More)
To assess the therapeutic role of amiloride in calcium nephrolithiasis, seven patients with renal stones were evaluated before and after 1 month of treatment each with amiloride (2.5 mg twice daily), hydrochlorothiazide (25 mg, twice daily), and both drugs at the same dosages. Although amiloride alone reduced urinary calcium in only two patients, it caused(More)
pHo is an important determinant of vascular tone in cerebral blood vessels. We investigated the effects of changes in pHo on isolated smooth muscle cells from the basilar artery of the guinea pig. Single cells contracted rapidly in response to an elevation in pHo (constant CO2), and contraction was blocked by nifedipine, suggesting a role for(More)
OBJECTIVE We investigated the use of Matrigel to enhance the growth of human meningiomas in athymic (nude) mice. Tumor take and growth of xenograft meningioma cells in an in vivo model have previously been only partially successful. METHODS The use of Matrigel has been reported to enhance tumorigenicity in a variety of solid tumors. This substance is(More)
BACKGROUND Epidermoids of the central nervous system are rare tumors. They are usually found in the fourth decade of life and most commonly off midline in the cerebellopontine angle. We report here a rare case of an epidermoid arising from the sphenoid sinus with extension into the sella and adjacent structures with acute onset of neurological deficit. The(More)
N-(3,5-Dichlorophenyl)succinimide (NDPS) is an experimental fungicide which induces renal toxicity. The following study examined the nephrotoxicity induced by NDPS in streptozotocin (STZ) diabetic rats. Male Fischer 344 (F344) rats were injected with 35 mg/kg STZ (i.p.) or citrate buffer. Fourteen days after STZ or citrate buffer injection, the rats (4-6(More)
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