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CFTR is functionally active in GnRH-expressing GT1-7 hypothalamic neurons.

R T Weyler1, K A Yurko-Mauro, R Rubenstein

  • 1Division of Gastroenterology and Nutrition, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA.

The American Journal of Physiology
|September 14, 1999
PubMed
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The cystic fibrosis transmembrane conductance regulator (CFTR) is expressed in brain regions controlling sexual function. CFTR in hypothalamic neurons regulates GnRH secretion, suggesting a role in cystic fibrosis manifestations.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • The cystic fibrosis transmembrane conductance regulator (CFTR) gene, mRNA, and protein are expressed in rat and human brain regions involved in sexual differentiation and function.
  • GT1-7 cells, a GnRH-secreting hypothalamic neuronal cell line, express CFTR and exhibit cAMP-dependent chloride efflux.

Purpose of the Study:

  • To investigate the role of CFTR in GnRH secretion and neurosecretion in GT1-7 hypothalamic neurons.
  • To explore the potential link between abnormal CFTR function and cystic fibrosis manifestations.

Main Methods:

  • Utilized GT1-7 cells to study CFTR expression and function.
  • Employed antisense oligonucleotide targeting CFTR mRNA to assess its impact on GnRH secretion and chloride efflux.
  • Western blotting was used to detect CFTR protein levels.

Related Experiment Videos

Main Results:

  • CFTR gene, mRNA, and protein were identified in GT1-7 cells, mediating cAMP-dependent chloride efflux.
  • Inhibition of CFTR mRNA with antisense oligonucleotides significantly reduced GnRH secretion without affecting intracellular GnRH synthesis.
  • Antisense oligonucleotides also inhibited cAMP-dependent chloride efflux and reduced CFTR protein expression.

Conclusions:

  • GT1-7 hypothalamic neurons express functional CFTR that modulates neurosecretion, specifically GnRH release.
  • Abnormal neuropeptide vesicle trafficking due to mutant CFTR may contribute to the diverse symptoms observed in cystic fibrosis.