IL17A and chronic obstructive pulmonary disease: Four experimental groups were constituted: Control group—animals housed in a vivarium, receiving filtered room air; Control anti-IL-17 group—animals housed in a vivarium, receiving filtered room air and treatment with an anti-IL-17-neutralizing antibody; COPD group—animals exposed to cigarette smoke; and COPD anti-IL-17 group—animals exposed to cigarette smoke and treated with an anti-IL-17-neutralizing antibody.