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Amiloride sensitivity in the neonatal rat

S I Sollars1, I L Bernstein

  • 1Department of Psychology, University of Washington.

Behavioral Neuroscience
|October 1, 1994
PubMed
Summary

Neonatal rats possess functional amiloride-sensitive sodium channels, contrary to previous beliefs. These channels are crucial for sodium chloride (NaCl) intake in young rats, as demonstrated by amiloride

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Area of Science:

  • Neuroscience
  • Taste physiology
  • Developmental biology

Background:

  • Amiloride-sensitive sodium channels are implicated in NaCl taste perception in adult rats.
  • Neonatal rats exhibit a heightened preference for hypertonic NaCl solutions, suggesting potential developmental differences in taste pathways.

Purpose of the Study:

  • To investigate the presence and function of amiloride-sensitive sodium channels in neonatal rats.
  • To determine if these channels contribute to the exaggerated NaCl preference observed in early development.

Main Methods:

  • NaCl intake was measured in neonatal rats following amiloride administration.
  • Chorda tympani (CT) nerve activity was recorded and analyzed in response to NaCl stimulation.
  • CT transection was performed to assess the neural pathway's role in amiloride sensitivity.

Main Results:

  • Amiloride pretreatment significantly reduced NaCl intake in neonatal rats, while water and NH4Cl intake remained unaffected.
  • CT transection diminished NaCl intake and abolished amiloride's effect, indicating neural mediation.
  • Direct recordings of CT activity confirmed significant suppression of NaCl responses by amiloride in young rats.

Conclusions:

  • Amiloride-sensitive sodium channels are functional in neonatal rats, developing earlier than previously thought.
  • These channels play a significant role in mediating NaCl taste responses and intake during early development.
  • The findings challenge existing models of taste development and NaCl preference in rats.

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