title: Pulmonary emphysema induced by passive smoking: an experimental study in rats.
abstract: We describe a short time model for inducing experimental emphysema in rats by chronic tobacco smoke inhalation. Three groups of male Wistar rats (6 months old) were studied: controls (N = 8), rats intoxicated for 45 days (s-45, N = 7) or for 90 days (s-90, N = 8). The exposed animals were intoxicated 3 times a day (10 cigarettes per exposure period), 5 days a week. Pulmonary damage was assessed by means of functional tests and quantitative pathological examination of the airways and lung parenchyma. The s-45 and s-90 animals were similar in terms of functional residual capacity (FRC) corrected for body weight (FRC/kg) but both groups of smoking rats exhibited significantly higher FRC/kg values than the controls (s-45 = 6.33; s-90 = 6.46; controls = 3.78; P < 0.05). When the two groups of smoking rats were pooled together and compared to controls, they showed decreased lung elastance (1.6 vs 2.19; P = 0.046) and increased mean linear intercept (Lm) (85.14 vs 66.44; P = 0.025). The s-90 animals presented higher inflammation and muscular hypertrophy at the level of the axial bronchus than the controls (P < 0.05). When smoking groups were pooled and compared to controls, they presented significantly higher inflammation at the lateral level (P = 0.028), as well as airway secretory hyperplasia (P = 0.024) and smooth muscle hypertrophy (P = 0.005) at the axial level. Due to its simplicity, low cost and short duration, this technique may be a useful model to obtain new information about airspace remodeling due to chronic tobacco consumption.
authors.affiliation: Disciplina de Pneumologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, Brasil.
authors.forename: S P
authors.initials: SP
authors.lastname: Cendon
authors.forename: C
authors.initials: C
authors.lastname: Battlehner
authors.forename: G
authors.initials: G
authors.lastname: Lorenzi Filho
authors.forename: M
authors.initials: M
authors.lastname: Dohlnikoff
authors.forename: P M
authors.initials: PM
authors.lastname: Pereira
authors.forename: G M
authors.initials: GM
authors.lastname: Conceição
authors.forename: O S
authors.initials: OS
authors.lastname: Beppu
authors.forename: P H
authors.initials: PH
authors.lastname: Saldiva
mesh_terms: D000818:Animals; D008297:Male; D011656:Pulmonary Emphysema / Q000209:etiology*; D051381:Rats; D017208:Rats, Wistar; D014028:Tobacco Smoke Pollution / Q000009:adverse effects*
chemical_list: D014028:Tobacco Smoke Pollution