Acute bronchial obstruction in sheep: histopathology and gland cytokine expression.
An ovine model of smoke inhalation and burn (S+B) injury models the pathophysiology of these injuries in humans. This study examines the degree of airway obstruction, associated histopathology, and bronchial gland cell expression of cytokines during the first 24 hours after S+B injury in sheep. Changes in the mean degree of obstruction were limited to the bronchial airways, showing significant increases in obstruction with time, P<.05. At 4 hours after injury, the obstructive material was predominantly mucus, with neutrophils clustered around and within gland acini. At 8 to 24 hours, bronchial obstruction was characterized by increased inflammatory cell accumulation. Immunohistochemical results showed that gland cells constitutively express and secrete interleukin (IL)-1beta, and that after injury there is an increase in the percentage of gland cells staining for IL-1alpha, IL-8, and tumor necrosis factor (TNF)-alpha, P<.05.
Cox
Robert A
RA
department of Pathology, University of Texas Medical Branch, Galveston, Texas 77550, USA. rocox@utumb.edu
Burke
Ann S
AS
Oliveras
Gloria
G
Enkhbaatar
Perenlei
P
Traber
Lillian D
LD
Zwischenberger
Joseph B
JB
Jeschke
Marc G
MG
Schmalstieg
Frank C
FC
Herndon
David N
DN
Traber
Daniel L
DL
Hawkins
Hal K
HK