Effects of growth hormone and insulin-like growth factor I on rabbit proximal convoluted tubule transport

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Abstract

This in vitro microperfusion study examined the effects of growth hormone and insulin-like growth factor I (IGF-I) on proximal convoluted tubule (PCT) transport. Tubules were perfused with an ultrafiltrate-like solution and bathed in a serumlike albumin solution. Neither a physiologic (5 × 10-10 M), nor a pharmacologic (5 × 10-8 M) dose of growth hormone had an effect on PCT phosphate or bicarbonate transport, or volume absorption. Addition of 5 × 10-9 M and 5 × 10-8 M IGF-I, but not 5 ″ 10-10 M IGF-I, to the bathing solution resulted in an increase (12-15%) in phosphate transport, but no change in volume absorption or bicarbonate transport. Addition of IGF-I to the luminal perfusate also stimulated phosphate transport. The effect was noted at a concentration of 5 × 10-11 M IGF-I (27% stimulation) and was maximal at a concentration of 5 × 10-10 M IGF-I (46% stimulation). There was no effect of luminal IGF-I on volume absorption or bicarbonate transport. These data indicate that growth hormone has no direct effect on PCT transport. In the PCT, IGF-I stimulates phosphate transport specifically and acts via both basolateral and apical membranes. However, the magnitude of the maximal response to the luminal addition of IGF-I was threefold greater than that measured upon addition of the hormone to the bath, and the stimulation occurred at a 100-fold lower concentration. These data are consistent with IGF-I mediating the in vivo stimulation of phosphate transport by growth hormone.

Original languageEnglish (US)
Pages (from-to)368-374
Number of pages7
JournalJournal of Clinical Investigation
Volume88
Issue number2
StatePublished - Aug 1991

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Insulin-Like Growth Factor I
Growth Hormone
Rabbits
Phosphates
Bicarbonates
Baths
Albumins
Hormones
Membranes

Keywords

  • Bicarbonate transport
  • In vitro microperfusion
  • Phosphate transport
  • Volume absorption

ASJC Scopus subject areas

  • Medicine(all)

Cite this

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title = "Effects of growth hormone and insulin-like growth factor I on rabbit proximal convoluted tubule transport",
abstract = "This in vitro microperfusion study examined the effects of growth hormone and insulin-like growth factor I (IGF-I) on proximal convoluted tubule (PCT) transport. Tubules were perfused with an ultrafiltrate-like solution and bathed in a serumlike albumin solution. Neither a physiologic (5 × 10-10 M), nor a pharmacologic (5 × 10-8 M) dose of growth hormone had an effect on PCT phosphate or bicarbonate transport, or volume absorption. Addition of 5 × 10-9 M and 5 × 10-8 M IGF-I, but not 5 ″ 10-10 M IGF-I, to the bathing solution resulted in an increase (12-15{\%}) in phosphate transport, but no change in volume absorption or bicarbonate transport. Addition of IGF-I to the luminal perfusate also stimulated phosphate transport. The effect was noted at a concentration of 5 × 10-11 M IGF-I (27{\%} stimulation) and was maximal at a concentration of 5 × 10-10 M IGF-I (46{\%} stimulation). There was no effect of luminal IGF-I on volume absorption or bicarbonate transport. These data indicate that growth hormone has no direct effect on PCT transport. In the PCT, IGF-I stimulates phosphate transport specifically and acts via both basolateral and apical membranes. However, the magnitude of the maximal response to the luminal addition of IGF-I was threefold greater than that measured upon addition of the hormone to the bath, and the stimulation occurred at a 100-fold lower concentration. These data are consistent with IGF-I mediating the in vivo stimulation of phosphate transport by growth hormone.",
keywords = "Bicarbonate transport, In vitro microperfusion, Phosphate transport, Volume absorption",
author = "Raymond Quigley and Michel Baum",
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T1 - Effects of growth hormone and insulin-like growth factor I on rabbit proximal convoluted tubule transport

AU - Quigley, Raymond

AU - Baum, Michel

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N2 - This in vitro microperfusion study examined the effects of growth hormone and insulin-like growth factor I (IGF-I) on proximal convoluted tubule (PCT) transport. Tubules were perfused with an ultrafiltrate-like solution and bathed in a serumlike albumin solution. Neither a physiologic (5 × 10-10 M), nor a pharmacologic (5 × 10-8 M) dose of growth hormone had an effect on PCT phosphate or bicarbonate transport, or volume absorption. Addition of 5 × 10-9 M and 5 × 10-8 M IGF-I, but not 5 ″ 10-10 M IGF-I, to the bathing solution resulted in an increase (12-15%) in phosphate transport, but no change in volume absorption or bicarbonate transport. Addition of IGF-I to the luminal perfusate also stimulated phosphate transport. The effect was noted at a concentration of 5 × 10-11 M IGF-I (27% stimulation) and was maximal at a concentration of 5 × 10-10 M IGF-I (46% stimulation). There was no effect of luminal IGF-I on volume absorption or bicarbonate transport. These data indicate that growth hormone has no direct effect on PCT transport. In the PCT, IGF-I stimulates phosphate transport specifically and acts via both basolateral and apical membranes. However, the magnitude of the maximal response to the luminal addition of IGF-I was threefold greater than that measured upon addition of the hormone to the bath, and the stimulation occurred at a 100-fold lower concentration. These data are consistent with IGF-I mediating the in vivo stimulation of phosphate transport by growth hormone.

AB - This in vitro microperfusion study examined the effects of growth hormone and insulin-like growth factor I (IGF-I) on proximal convoluted tubule (PCT) transport. Tubules were perfused with an ultrafiltrate-like solution and bathed in a serumlike albumin solution. Neither a physiologic (5 × 10-10 M), nor a pharmacologic (5 × 10-8 M) dose of growth hormone had an effect on PCT phosphate or bicarbonate transport, or volume absorption. Addition of 5 × 10-9 M and 5 × 10-8 M IGF-I, but not 5 ″ 10-10 M IGF-I, to the bathing solution resulted in an increase (12-15%) in phosphate transport, but no change in volume absorption or bicarbonate transport. Addition of IGF-I to the luminal perfusate also stimulated phosphate transport. The effect was noted at a concentration of 5 × 10-11 M IGF-I (27% stimulation) and was maximal at a concentration of 5 × 10-10 M IGF-I (46% stimulation). There was no effect of luminal IGF-I on volume absorption or bicarbonate transport. These data indicate that growth hormone has no direct effect on PCT transport. In the PCT, IGF-I stimulates phosphate transport specifically and acts via both basolateral and apical membranes. However, the magnitude of the maximal response to the luminal addition of IGF-I was threefold greater than that measured upon addition of the hormone to the bath, and the stimulation occurred at a 100-fold lower concentration. These data are consistent with IGF-I mediating the in vivo stimulation of phosphate transport by growth hormone.

KW - Bicarbonate transport

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