PM2.5-induced lung inflammation in mice: Differences of inflammatory response in macrophages and type II alveolar cells

2017 ◽  
Vol 37 (10) ◽  
pp. 1203-1218 ◽  
Author(s):  
Miao He ◽  
Takamichi Ichinose ◽  
Seiichi Yoshida ◽  
Tomohiro Ito ◽  
Cuiying He ◽  
...  
Keyword(s):  
Inflammatory Response ◽  
Lung Inflammation ◽  
Type Ii ◽  
Alveolar Cells ◽  
Type Ii Alveolar Cells

Genetic deletion of IL-17A reduces cigarette smoke-induced inflammation and alveolar type II cell apoptosis

2014 ◽  
Vol 306 (2) ◽  
pp. L132-L143 ◽  
Author(s):  
Ying Chang ◽  
Laila Al-Alwan ◽  
Severine Audusseau ◽  
Fazila Chouiali ◽  
Juna Carlevaro-Fita ◽  
...  
Keyword(s):  
Inflammatory Response ◽  
Cigarette Smoke ◽  
Cell Apoptosis ◽  
Alveolar Type ◽  
Inflammatory Disorder ◽  
Type Ii ◽  
Wild Type ◽  
Alveolar Cells ◽  
Alveolar Cell ◽  
Type Ii Alveolar Cells

Chronic obstructive pulmonary disease (COPD) is an inflammatory disorder marked by relative resistance to steroids. Inflammation and apoptosis have been suggested to be important mechanisms for COPD. Interleukin (IL)-17 superfamily has been associated with chronic inflammation and diminished responses to steroids. It is reasonable to consider that IL-17 may play a role in the pathogenesis of COPD. In this study, we examined IL-17 expression in mice exposed to cigarette smoke (CS) and investigated the contribution of IL-17 to CS-induced inflammation and alveolar cell apoptosis in IL-17−/− mice. After exposing wild-type and IL-17−/− mice to mainstream CS for 4 wk, IL-17A, but not IL-17F, expression was increased in mice upon CS exposure. Neutrophil infiltration in the lungs of IL-17−/− mice was significantly decreased. In IL-17−/− mice, there is reduced expression of IL-6, macrophage inflammatory protein-2, and matrix metalloproteinase-12 compared with wild-type mice after CS exposure. The number of apoptotic type II alveolar cells was significantly increased in CS-exposed wild-type mice but not in IL-17−/− mice. The effect of IL-17A on type II alveolar cell apoptosis was confirmed in vitro through either addition of IL-17A or transient knockdown of IL-17A by small-interfering RNA transfection in type II alveolar cells. These findings suggest that IL-17A plays an important role in the inflammatory response to CS exposure through increased multiple inflammatory mediators. Moreover, IL-17 may also contribute to type II alveolar cell apoptosis. This study opens a new option in targeting IL-17A to modulate inflammatory response to CS and may be the bases for new therapy for COPD.

scholarly journals Bradykinin Stimulates Type II Alveolar Cells to Release Neutrophil and Monocyte Chemotactic Activity and Inflammatory Cytokines

1998 ◽  
Vol 153 (6) ◽  
pp. 1885-1893 ◽  
Author(s):  
Sekiya Koyama ◽  
Etsuro Sato ◽  
Hiroshi Nomura ◽  
Keishi Kubo ◽  
Masakazu Miura ◽  
...  
Keyword(s):  
Inflammatory Cytokines ◽  
Chemotactic Activity ◽  
Type Ii ◽  
Alveolar Cells ◽  
Type Ii Alveolar Cells

scholarly journals CD8+ T Cell–mediated Injury In Vivo Progresses in the Absence of Effector T Cells

2001 ◽  
Vol 194 (12) ◽  
pp. 1835-1846 ◽  
Author(s):  
Barbara A. Small ◽  
Sarah A. Dressel ◽  
Christopher W. Lawrence ◽  
Donald R. Drake ◽  
Mark H. Stoler ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
Tissue Injury ◽  
Cd8 T Cell ◽  
Effector T Cells ◽  
Type Ii ◽  
Pulmonary Injury ◽  
Alveolar Cells ◽  
Type Ii Alveolar Cells

Tissue injury is a common sequela of acute virus infection localized to a specific organ such as the lung. Tissue injury is an immediate consequence of infection with lytic viruses. It can also result from the direct destruction of infected cells by effector CD8+ T lymphocytes and indirectly through the action of the T cell–derived proinflammatory cytokines and recruited inflammatory cells on infected and uninfected tissue. We have examined CD8+ T cell–mediated pulmonary injury in a transgenic model in which adoptively transferred, virus-specific cytotoxic T lymphocytes (CTLs) produce lethal, progressive pulmonary injury in recipient mice expressing the viral target transgene exclusively in the lungs. We have found that over the 4–5 day course of the development of lethal pulmonary injury, the effector CTLs, while necessary for the induction of injury, are present only transiently (24–48 h) in the lung. We provide evidence that the target of the antiviral CD8+ T cells, the transgene expressing type II alveolar cells, are not immediately destroyed by the effector T cells. Rather, after T cell–target interaction, the type II alveolar cells are stimulated to produce the chemokine monocyte chemoattractant protein 1. These results reinforce the concept that, in vivo, the cellular targets of specific CTLs may participate directly in the development of progressive tissue injury by activating in response to interaction with the T cells and producing proinflammatory mediators without sustained in vivo activation of CD8+ T cell effectors.

scholarly journals Cellular interaction of nontypeableHaemophilus influenzaetriggers cytotoxicity of infected type II alveolar cells via apoptosis

2014 ◽  
pp. n/a-n/a ◽  
Author(s):  
Manu Goyal ◽  
Meenu Singh ◽  
Pallab Ray ◽  
Radhika Srinivasan ◽  
Anuradha Chakraborti
Keyword(s):  
Cellular Interaction ◽  
Type Ii ◽  
Alveolar Cells ◽  
Type Ii Alveolar Cells
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