Platelet-derived Wnt antagonist Dickkopf-1 is implicated in ICAM-1/VCAM-1-mediated neutrophilic acute lung inflammation.
Neutrophil infiltration represents the early acute inflammatory response in acute lung injury. The recruitment of neutrophils from the peripheral blood across the endothelial-epithelial barrier into the alveolar airspace is highly regulated by the adhesion molecules on alveolar epithelial cells (AECs). Wnt/β-catenin signaling is involved in the progression of inflammatory lung diseases including asthma, emphysema, and pulmonary fibrosis. However, the function of Wnt/β-catenin signaling in acute lung inflammation is unknown. Here, we identified platelet-derived Dickkopf-1 (Dkk1) as the major Wnt antagonist contributing to the suppression of Wnt/β-catenin signaling in AECs during acute lung inflammation. Intratracheal administration of Wnt3a or an antibody capable of neutralizing Dkk1 inhibited neutrophil influx into the alveolar airspace of injured lungs. Activation of Wnt/β-catenin signaling in AECs attenuated intercellular adhesion molecule 1 (ICAM-1)/vascular cell adhesion molecule 1 (VCAM-1)-mediated adhesion of both macrophages and neutrophils to AECs. Our results suggest a role for Wnt/β-catenin signaling in modulating the inflammatory response, and a functional communication between platelets and AECs during acute lung inflammation. Targeting Wnt/β-catenin signaling and the communication between platelets and AECs therefore represents potential therapeutic strategies to limit the damage of acute pulmonary inflammation.
Lundberg-Kienlen Lung Biology and Toxicology Laboratory, Department of Physiological Sciences and Oklahoma Center for Respiratory and Infectious Diseases, Oklahoma State University, Stillwater, OK.
Yujie
Y
Guo
Lundberg-Kienlen Lung Biology and Toxicology Laboratory, Department of Physiological Sciences and.
Amarjit
A
Mishra
Lundberg-Kienlen Lung Biology and Toxicology Laboratory, Department of Physiological Sciences and.
Emily
E
Howland
Lundberg-Kienlen Lung Biology and Toxicology Laboratory, Department of Physiological Sciences and.
Chunling
C
Zhao
Lundberg-Kienlen Lung Biology and Toxicology Laboratory, Department of Physiological Sciences and.
Dhananjay
D
Shukla
Lundberg-Kienlen Lung Biology and Toxicology Laboratory, Department of Physiological Sciences and.
Tingting
T
Weng
Lundberg-Kienlen Lung Biology and Toxicology Laboratory, Department of Physiological Sciences and Oklahoma Center for Respiratory and Infectious Diseases, Oklahoma State University, Stillwater, OK.
Lin
http://orcid.org/0000-0002-4811-4897
L
Liu
D055371:Acute Lung Injury / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D000818:Animals; D001792:Blood Platelets / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D018799:Intercellular Adhesion Molecule-1 / Q000276:immunology / Q000378:metabolism*; D036341:Intercellular Signaling Peptides and Proteins / Q000276:immunology / Q000378:metabolism*; D008297:Male; D051379:Mice; D009504:Neutrophils / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D051381:Rats; D019010:Vascular Cell Adhesion Molecule-1 / Q000276:immunology / Q000378:metabolism*; D060449:Wnt Signaling Pathway; D051176:beta Catenin / Q000276:immunology / Q000378:metabolism
C501127:Dkk1 protein, mouse; C531384:Dkk1 protein, rat; C090509:Icam1 protein, mouse; D036341:Intercellular Signaling Peptides and Proteins; D019010:Vascular Cell Adhesion Molecule-1; D051176:beta Catenin; D018799:Intercellular Adhesion Molecule-1