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Time course studies on phosphate transfer in frog urinary bladder.

M Parisi1, L Cancela

  • 1Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires, Argentina.

Kidney International
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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Sodium influences phosphate transport in frog bladders. Transepithelial potential differences (PD) are crucial for handling phosphate, with hormones like parathyroid hormone and oxytocin inhibiting its movement.

Area of Science:

  • Physiology
  • Renal Physiology
  • Ion Transport

Background:

  • The frog urinary bladder is a model for studying epithelial transport.
  • Understanding phosphate handling is vital for renal function and overall homeostasis.

Purpose of the Study:

  • To investigate the role of sodium and transepithelial potential difference (PD) in regulating phosphate transport across the frog urinary bladder.
  • To examine the effects of hormones on phosphate fluxes.

Main Methods:

  • Simultaneous measurement of unidirectional 32P-phosphate and 3H-mannitol fluxes at 2-minute intervals.
  • Recording of spontaneous or imposed transepithelial potential (PD) and short circuit current (SCC).
  • Manipulation of mucosal sodium concentration and application of amiloride, parathyroid hormone, and oxytocin.

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Main Results:

  • Phosphate transfer was rapidly and reversibly modulated by mucosal sodium concentration in open circuit conditions.
  • Phosphate fluxes showed a strong correlation with Na-dependent transmembrane potential (r = 0.99).
  • Amiloride inhibited mucosa-to-serosa phosphate flux in open circuit, while parathyroid hormone and oxytocin reduced it.

Conclusions:

  • Transepithelial potential difference (PD) plays a significant role in phosphate handling in the frog urinary bladder.
  • Sodium-dependent transport mechanisms are involved in phosphate movement.
  • Hormonal regulation of phosphate transport is evident in this model.