Histopathological analysis was performed as described before25 (link). Briefly, mice were sacrificed and lung tissues were inflated and fixed in PFA, embedded in paraffin or frozen in optimal cutting temperature compound (OCT) and sectioned for hematoxylin and eosin (H&E) staining. Immunohistochemical and immunofluorescence analyses were performed as described34 (link). Antibodies against the following proteins were used: KI-67 (Novocastra Laboratories Ltd), CDC42 (Abcam), ZO1 (33-9100, Zymed); PAR6 (sc-14405, Santa Cruz), Occludin (353197a Zymed), Phalloidin (R415 Invitrogen), CCSP (Santa Cruz), SP-C (AB3786, Chemicon), Beta Galactosidase (ab9631, Abcam), Biotinylated goat anti-rabbit secondary antibody (ZYMED company), Alexa Fluor 555 or 488 conjugated anti-mouse, rat or rabbit IgG secondary antibodies (Invitrogen).
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