Systemic leptin produces a long-lasting increase in respiratory motor output in rats

Zheng Chang, Edmund Ballou, Weijie Jiao, Kevin E. McKenna, Shaun Morrison, Donald R. McCrimmon

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Leptin decreases food intake and increases energy expenditure. Leptin administration into the CNS of mice or rats increases alveolar ventilation and dysfunction in leptin signaling has been implicated in the hypoventilation that can accompany obesity. An increase in CO2 chemosensitivity has been implicated in this response but it is unclear whether ventilation is augmented when PCO2 is maintained constant. We examined the effects of intravenous leptin to test the hypothesis that systemic leptin administration in isoflurane anesthetized, mechanically ventilated and vagotomized rats would lead to a sustained increase in respiratory motor output that was independent of changes in end-tidal PCO2, body temperature or lung inflation pressure (an indicator of overall lung and chest wall compliance). In anesthetized Sprague-Dawley rats with end-tidal PCO2, lung compliance and rectal temperature maintained constant, injection of a bolus of leptin (0.25 mg, 0.5 mg/ml, i.v.), followed over the next 1 h by the intravenous infusion of an additional 0.25 mg, elicited a progressive increase in the peak amplitude of integrated phrenic nerve discharge lasting at least 1 h beyond the end of the infusion. The increase peaked at 90 min at 58.3 ± 5.7% above baseline. There was an associated increase in the slope of the phrenic response to increasing inspired CO2. There was also a moderate and sustained decrease in arterial pressure 9 ± 1.3 mmHg at 120 min, with no associated change in heart rate. These data indicate that leptin elicits a sustained increase in respiratory motor output that outlasts the administration leptin via a mechanism that does not require alterations in arterial PCO2, body temperature, or systemic afferent feedback via the vagus nerves. This stimulation may help to prevent obesity-related hypoventilation.

Original languageEnglish (US)
Article numberArticle 16
JournalFrontiers in Physiology
Volume4 FEB
StatePublished - 2013

Fingerprint

Leptin
Hypoventilation
Body Temperature
Ventilation
Obesity
Lung Compliance
Lung
Phrenic Nerve
Vagus Nerve
Isoflurane
Economic Inflation
Thoracic Wall
Diaphragm
Intravenous Infusions
Energy Metabolism
Compliance
Sprague Dawley Rats
Arterial Pressure
Eating
Heart Rate

Keywords

  • Leptin
  • Leptin stimulation of breathing
  • Metabolic control of breathing
  • Neural control of breathing
  • Respiratory modulation

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

Chang, Z., Ballou, E., Jiao, W., McKenna, K. E., Morrison, S., & McCrimmon, D. R. (2013). Systemic leptin produces a long-lasting increase in respiratory motor output in rats. Frontiers in Physiology, 4 FEB, [Article 16].

Systemic leptin produces a long-lasting increase in respiratory motor output in rats. / Chang, Zheng; Ballou, Edmund; Jiao, Weijie; McKenna, Kevin E.; Morrison, Shaun; McCrimmon, Donald R.

In: Frontiers in Physiology, Vol. 4 FEB, Article 16, 2013.

Research output: Contribution to journalArticle

Chang, Z, Ballou, E, Jiao, W, McKenna, KE, Morrison, S & McCrimmon, DR 2013, 'Systemic leptin produces a long-lasting increase in respiratory motor output in rats', Frontiers in Physiology, vol. 4 FEB, Article 16.
Chang Z, Ballou E, Jiao W, McKenna KE, Morrison S, McCrimmon DR. Systemic leptin produces a long-lasting increase in respiratory motor output in rats. Frontiers in Physiology. 2013;4 FEB. Article 16.
Chang, Zheng ; Ballou, Edmund ; Jiao, Weijie ; McKenna, Kevin E. ; Morrison, Shaun ; McCrimmon, Donald R. / Systemic leptin produces a long-lasting increase in respiratory motor output in rats. In: Frontiers in Physiology. 2013 ; Vol. 4 FEB.
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