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  • 1
    Electronic Resource
    Electronic Resource
    Down-regulation of the PTH/PTHrP receptor in uremia (1994)
    Springer
    Journal of bone and mineral metabolism 12 (1994), S. S87 
    Details
    ISSN: 1435-5604
    Keywords: PTH/PTHrP receptor ; uremia ; secondary hyperparathyroidism ; PTH/PTHrP receptor mRNA expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Resistance to the action of PTH has been well characterized in the setting of chronic renal failure. Most evidence points to post-receptor abnormalities in its pathogenesis. The recent cloning of the PTH/PTHrP receptor (PTH-R) has permitted us to examine whether in a 5/6 nephrectomy rat model (CRF) the expression of the PTH-R gene is modified. First, we have found that the renal PTH-R mRNA expression is markedly decreased in CRF compared to normal rats. Diminished PTH-R transcripts were associated with a lower PTH-induced cAMP production in renal membranes in CRF suggesting a decrease in the PTH-R number or post-receptor modifications. Second, thyroparathyroidectomized (TPTX) rats with normal renal function had no change in the renal PTH-R expression whereas TPTX-CRF rats still showed a decreased renal PTH-R mRNA expression suggesting that high plasma PTH levels were not etiologically important in the observed down-regulation. Despite the renal PTH-R down-regulation, CRF rats had a normal renal handling of calcium. They also had a higher phosphate excretion than control rats. TPTX-CRF rats showed a decrease in renal tubular calcium reabsorption and a phosphate retention when compared with CRF animals with intact parathyroid glands. This suggests that a few available PTH-R in the kidney allow PTH to exert, to a certain extent, its physiological role in this experimental model of uremia. In conclusion, these findings indicate a down-regulation of the renal PTH-R expression in CRF which appears to be independent of parathyroid gland function. The relevance of this phenomenon in the setting of the secondary hyperparathyroidism of uremia remains to be elucidated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375682
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Estrogen stimulates PTHrP but not PTH/PTHrP receptor gene expression in the kidney of ovariectomized rat (1998)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 70 (1998), S. 84-93 
    Details
    ISSN: 0730-2312
    Keywords: PTHrP ; PTH/PTHrP receptor ; estrogen ; ovariectomy ; kidney ; rat ; in vivo ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The aim of the present study was to test the hypothesis that the decreased renal tubular reabsorption of calcium observed in estrogen deficiency is associated with a local regulation of either PTHrP or PTH/PTHrP receptor genes in the kidney. Rats were randomly sham-operated (S) or ovariectomized receiving either vehicule (OVX) or 4 μg E2/kg/day (OVX+E4) or 40 μg E2/kg/d (OVX+E40) during 14 days using alzet minipumps. Plasma PTH and calcium levels were lower in untreated OVX animals than in all other groups (P 〈 0.01). Plasma PTH was higher in OVX+E40 than in OVX+E4 (P 〈 0.05). PTHrP mRNA expression in the kidney was unaffected by ovariectomy but was increased in OVX+E40 (0.984 ± 0.452 for PTHrP/GAPDH mRNAs expression vs. 0.213 ± 0.078 in sham, P 〈 0.01). PTH/PTHrP receptor mRNA expression and the cAMP response of renal membranes to PTH were unaffected by ovariectomy and estrogen substitution. In conclusion, renal PTHrP and PTH/PTHrP receptor mRNAs are not modified by ovariectomy. However, 17β-estradiol increases renal expression of PTHrP mRNA without evident changes in its receptor expression and function. This may help to explain the pharmacological action of estrogen in the kidney, especially how it prevents the renal leak of calcium in postmenopausal women. J. Cell. Biochem. 70:84-93, 1998. © 1998 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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