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Protein kinase C modulates ventilatory patterning in the developing rat.

H P Bandla1, N Simakajornboon, G R Graff

  • 1Constance S. Kaufman Pediatric Pulmonary Research Laboratory, Departments of Pediatrics and Physiology, and Inter-Departmental Neuroscience and Cellular and Molecular Biology Programs, Tulane University School of Medicine, New Orleans, LA, USA.

American Journal of Respiratory and Critical Care Medicine
|March 2, 1999
PubMed
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Systemic inhibition of Protein Kinase C (PKC) reduces ventilation in developing rat pups, primarily by altering respiratory timing. This effect diminishes with age, indicating PKC

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Respiratory Physiology

Background:

  • Protein Kinase C (PKC) is crucial for neuronal excitability and respiratory control in adult animals.
  • Understanding PKC's role in developing respiratory systems is essential for identifying maturational vulnerabilities.

Purpose of the Study:

  • To investigate the ventilatory effects of systemic Protein Kinase C inhibition during postnatal development in rat pups.
  • To determine age-dependent changes in respiratory responses to PKC inhibition.

Main Methods:

  • Whole-body plethysmography was used to record ventilation in rat pups of different postnatal ages (2-3, 5-6, 10-12, and 20-21 days).
  • Rat pups were treated with Ro 32-0432, a PKC inhibitor, or vehicle.
  • Immunoblotting was employed to analyze the expression patterns of various PKC isoforms in the brainstem and cortex.

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Main Results:

  • PKC inhibition significantly decreased minute ventilation (VE) in all age groups, with the most pronounced reduction observed in the youngest pups (2-3 days old).
  • Ventilation reduction was primarily due to a decrease in respiratory frequency, not tidal volume, driven by prolonged expiratory time.
  • PKC isoform expression varied with both postnatal age and brain region examined.

Conclusions:

  • Endogenous PKC inhibition causes age-dependent reductions in ventilation, predominantly affecting respiratory timing mechanisms.
  • The impact of PKC inhibition on ventilation decreases with advancing postnatal age.
  • Immature respiratory systems appear more critically dependent on PKC activity for overall respiratory output compared to older animals.