Responses to ozone are increased in obese mice

S. A. Shore, Y. M. Rivera-Sanchez, I. N. Schwartzman, R. A. Johnston

Research output: Contribution to journalArticle

139 Citations (Scopus)

Abstract

Epidemiological data indicate an increased incidence of asthma in overweight adults and children. Ozone (O3) is a common trigger for asthma. Accordingly, the purpose of this study was to compare O 3-induced airway hyperresponsiveness and airway inflammation in lean, wild-type (C57BL/6J) mice and mice that are obese as a consequence of a genetic defect in the gene encoding the satiety hormone leptin (ob/ob mice). The ob/ob mice eat excessively and weighed more than twice as much as age- and gender-matched wild-type mice. Airway responsiveness to intravenous methacholine was measured by forced oscillation. In air-exposed controls, baseline pulmonary resistance was greater, and the dose of methacholine required to double pulmonary resistance was lower in ob/ob than wild-type mice. Exposure to O3 (2 parts/million for 3 h) caused AHR and airway inflammation in both groups of mice, but responses to O3 were enhanced in ob/ob compared with wild-type mice. Administration of exogenous leptin did not reverse the enhanced inflammatory response observed in ob/ob mice, but augmented airway inflammation in wild-type mice. The inhaled dose of O3 per gram of lung tissue was greater in ob/ob than wild-type mice. Our results indicate that O3-induced airway responses are enhanced in ob/ob mice and suggest that inhaled O3 dose may be one factor contributing to this difference, but other aspects of the obese phenotype may also contribute. Our results also indicate that the hormone leptin, which is increased in the obese, has the capacity to increase airway inflammation.

Original languageEnglish (US)
Pages (from-to)938-945
Number of pages8
JournalJournal of Applied Physiology
Volume95
Issue number3
StatePublished - Sep 1 2003

Fingerprint

Obese Mice
Ozone
Leptin
Inflammation
Methacholine Chloride
Lung
Asthma
Hormones
Inbred C57BL Mouse
Air
Phenotype

Keywords

  • Inflammation
  • Leptin
  • Polymorphonuclear leukocytes
  • Pulmonary mechanics

ASJC Scopus subject areas

  • Physiology
  • Endocrinology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Shore, S. A., Rivera-Sanchez, Y. M., Schwartzman, I. N., & Johnston, R. A. (2003). Responses to ozone are increased in obese mice. Journal of Applied Physiology, 95(3), 938-945.

Responses to ozone are increased in obese mice. / Shore, S. A.; Rivera-Sanchez, Y. M.; Schwartzman, I. N.; Johnston, R. A.

In: Journal of Applied Physiology, Vol. 95, No. 3, 01.09.2003, p. 938-945.

Research output: Contribution to journalArticle

Shore, SA, Rivera-Sanchez, YM, Schwartzman, IN & Johnston, RA 2003, 'Responses to ozone are increased in obese mice', Journal of Applied Physiology, vol. 95, no. 3, pp. 938-945.
Shore SA, Rivera-Sanchez YM, Schwartzman IN, Johnston RA. Responses to ozone are increased in obese mice. Journal of Applied Physiology. 2003 Sep 1;95(3):938-945.
Shore, S. A. ; Rivera-Sanchez, Y. M. ; Schwartzman, I. N. ; Johnston, R. A. / Responses to ozone are increased in obese mice. In: Journal of Applied Physiology. 2003 ; Vol. 95, No. 3. pp. 938-945.
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