Flor Ángel Ordóñez

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The primary goal of this study was to determine if the ability to undergo catch-up growth following a transient injury is preserved in an experimental model of moderate chronic renal failure (CRF) and the effect of growth hormone (GH) administration on such phenomenon. Young rats were subtotally nephrectomized (days 0 and 4) (Nx). From days 11 to 13, food(More)
Rapamycin is a potent immunosuppressant with antitumoral properties widely used in the field of renal transplantation. To test the hypothesis that the antiproliferative and antiangiogenic activity of rapamycin interferes with the normal structure and function of growth plate and impairs longitudinal growth, 4-week-old male rats (n = 10/group) receiving 2(More)
Hypercalciuria was induced in female Sprague-Dawley rats, aged 40±2 days, by 7-day administration (mean±SEM) of calcitriol (5.4±0.1 ng/100 g per day, intraperitoneal), furosemide (14.9±1.9 mg/100 g per day, oral), or ammonium chloride (3.8±0.1 mEq/100 g per day, oral). Calciuria increased from 1.9±0.2, 1.6±0.2, and 1.9±0.3 to 5.4±0.5, 4.0±0.9, and 5.4±0.5(More)
Sirs, A 14-year-old white male was admitted to our hospital because of severe abdominal pain of acute onset. No diarrhea or vomiting had been noted. Eleven years before he had been diagnosed with steroid-sensitive idiopathic nephrotic syndrome. He had presented with 14 relapses, the last 19 months prior to admission. No medication other than prednisone had(More)
Over the last decade the discovery of fibroblast growth factor 23 (FGF23) and the progressive and ongoing clarification of its role in phosphate and mineral metabolism have led to expansion of the diagnostic spectrum of primary hypophosphatemic syndromes. This article focuses on the impairment of growth in these syndromes. Growth retardation is a common,(More)
To understand better the pathophysiology of growth impairment in persistent metabolic acidosis, the morphology and dynamics of the growth plate were studied in young rats grouped as follows: rats that were made acidotic by oral administration of ammonium chloride for 14 d (AC), nonacidotic rats that were fed ad libitum (control [C]), and nonacidotic rats(More)
Distal renal tubular acidosis (RTA) with nerve deafness is caused by mutations in the ATP6V1B1 gene causing defective function of the H+-ATPase proton pump. We report five acidotic children (four males) from four unrelated families: blood pH 7.21–7.33, serum bicarbonate 10.8–14.7 mEq/l, minimum urinary pH 6.5–7.1 and fractional excretion of bicarbonate in(More)
Hypokalemic tubular disorders may lead to growth retardation which is resistant to growth hormone (GH) treatment. The mechanism of these alterations is unknown. Weaning female rats were grouped (n = 10) in control, potassium-depleted (KD), KD treated with intraperitoneal GH at 3.3 mg x kg(-1) x day(-1) during the last week (KDGH), and control pair-fed with(More)
Rapamycin, a potent immunosuppressant used in renal transplantation, has been reported to impair longitudinal growth in experimental studies. Rapamycin is both antiproliferative and antiangiogenic; therefore, it has the potential to disrupt vascular endothelial growth factor (VEGF) action in the growth plate and to interfere with insulin-like growth factor(More)
Growth impairment induced by chronic metabolic acidosis is associated with an abnormal growth hormone (GH)/insulin-like growth factor-I (IGF-I) axis. To examine the potentially beneficial effects of IGF-I on acidosis-induced growth impairment and the influence of GH and IGF-I treatment on the GH/IGF-I axis, three groups of acidotic young rats (untreated,(More)