Long-term post-pneumonectomy pulmonary adaptation following all-trans-retinoic acid supplementation


RAVIKUMAR P., DANE D. M. , MCDONOUGH P., Yilmaz C. , ESTRERA A. S. , HSIA C. C. W.

JOURNAL OF APPLIED PHYSIOLOGY, cilt.110, ss.764-773, 2011 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 110 Konu: 3
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1152/japplphysiol.00994.2010
  • Dergi Adı: JOURNAL OF APPLIED PHYSIOLOGY
  • Sayfa Sayısı: ss.764-773

Özet

Ravikumar P, Dane DM, McDonough P, Yilmaz C, Estrera AS, Hsia CC. Long-term post-pneumonectomy pulmonary adaptation following all-trans-retinoic acid supplementation. J Appl Physiol 110: 764-773, 2011. First published November 25, 2010; doi:10.1152/japplphysiol.00994.2010.-In adult dogs following right pneumonectomy (PNX) and receiving all-trans-retinoic acid (RA) supplementation for 4 mo, we found modestly enhanced alveolar-capillary growth in the remaining lung without enhanced resting lung function (J Appl Physiol 96: 1080-1089 and 96: 1090-1096, 2004). Since alveolar remodeling progresses beyond this period and the lipid-soluble RA continues to be released from tissue stores, we hypothesized that RA supplementation may exert additional long-term effects. To examine this issue, adult male litter-matched foxhounds underwent right PNX followed by RA supplementation (2 mg/kg po 4 days/wk, n = 6) or placebo (n = 4) for 4 mo. Cardiopulmonary function was measured at rest and during exercise at 4 and 20 mo post-PNX. The remaining lung was fixed under a constant airway pressure for morphometric analysis. Comparing RA treatment to placebo controls, there were no differences in aerobic capacity, cardiopulmonary function, or lung volume at rest or exercise. Alveolar-capillary basal lamina thickness and mean harmonic thickness of air-blood diffusion barrier were 23-29% higher. The prevalence of double-capillary profiles remained 82% higher. Absolute volumes of septal interstitium, collagen fibers, cells, and matrix were 32% higher; the relative volumes of other septal components and alveolar-capillary surface areas expressed as ratios to control values were up to 24% higher. Thus RA supplementation following right PNX modestly and persistently enhanced long-term alveolar-capillary structural dimensions, especially the deposition of interstitial and connective tissue elements, in such a way that caused a net increase in barrier resistance to diffusion without improving lung mechanics or gas exchange.