Raquel Guillamat-Prats1, Gemma Gay-Jordi1, Antoni Xaubet2, Victor I Peinado2, Anna Serrano-Mollar3. 1. Department of Experimental Pathology, Institut d'Investigacions Biomèdiques de Barcelona, Consejo Superior de Investigaciones Cientificas (IIBB-CSIC) Barcelona, Spain; Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) Barcelona, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES) Mallorca, Spain. 2. Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) Barcelona, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES) Mallorca, Spain; Servei de Pneumologia, Institud Clínic del Tórax, Hospital Clínic, Barcelona, Spain. 3. Department of Experimental Pathology, Institut d'Investigacions Biomèdiques de Barcelona, Consejo Superior de Investigaciones Cientificas (IIBB-CSIC) Barcelona, Spain; Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) Barcelona, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES) Mallorca, Spain. Electronic address: anna.serranomollar@iibb.csic.es.
Abstract
BACKGROUND: Alveolar Type II cell transplantation has been proposed as a cell therapy for the treatment of idiopathic pulmonary fibrosis. Its long-term benefits include repair of lung fibrosis, but its success partly depends on the restoration of lung homeostasis. Our aim was to evaluate surfactant protein restoration after alveolar Type II cell transplantation in an experimental model of bleomycin-induced lung fibrosis in rats. METHODS: Lung fibrosis was induced by intratracheal instillation of bleomycin. Alveolar Type II cells were obtained from healthy animals and transplanted 14 days after bleomycin was administered. Furthermore, one group transplanted with alveolar macrophages and another group treated with surfactant were established to evaluate the specificity of the alveolar Type II cell transplantation. The animals were euthanized at 21 days after bleomycin instillation. Lung fibrosis was confirmed by a histologic study and an evaluation of the hydroxyproline content. Changes in surfactant proteins were evaluated by mRNA expression, Western blot and immunofluorescence studies. RESULTS: The group with alveolar Type II cell transplantation was the only one to show a reduction in the degree of lung fibrosis and a complete recovery to normal levels of surfactant proteins. CONCLUSION: One of the mechanisms involved in the beneficial effect of alveolar Type II cell transplantation is restoration of lung surfactant protein levels, which is required for proper respiratory function.
BACKGROUND:Alveolar Type II cell transplantation has been proposed as a cell therapy for the treatment of idiopathic pulmonary fibrosis. Its long-term benefits include repair of lung fibrosis, but its success partly depends on the restoration of lung homeostasis. Our aim was to evaluate surfactant protein restoration after alveolar Type II cell transplantation in an experimental model of bleomycin-induced lung fibrosis in rats. METHODS:Lung fibrosis was induced by intratracheal instillation of bleomycin. Alveolar Type II cells were obtained from healthy animals and transplanted 14 days after bleomycin was administered. Furthermore, one group transplanted with alveolar macrophages and another group treated with surfactant were established to evaluate the specificity of the alveolar Type II cell transplantation. The animals were euthanized at 21 days after bleomycin instillation. Lung fibrosis was confirmed by a histologic study and an evaluation of the hydroxyproline content. Changes in surfactant proteins were evaluated by mRNA expression, Western blot and immunofluorescence studies. RESULTS: The group with alveolar Type II cell transplantation was the only one to show a reduction in the degree of lung fibrosis and a complete recovery to normal levels of surfactant proteins. CONCLUSION: One of the mechanisms involved in the beneficial effect of alveolar Type II cell transplantation is restoration of lung surfactant protein levels, which is required for proper respiratory function.
Keywords:
alveolar Type II cells; cell therapy; pulmonary fibrosis; surfactant protein A; surfactant protein B; surfactant protein C; surfactant protein D
Authors: Kelly A Correll; Karen E Edeen; Rachel L Zemans; Elizabeth F Redente; Karina A Serban; Douglas Curran-Everett; Benjamin L Edelman; Amanda Mikels-Vigdal; Robert J Mason Journal: Am J Physiol Lung Cell Mol Physiol Date: 2019-06-05 Impact factor: 5.464
Authors: Kalpaj R Parekh; Janna Nawroth; Albert Pai; Shana M Busch; Christiana N Senger; Amy L Ryan Journal: Am J Physiol Cell Physiol Date: 2020-08-12 Impact factor: 4.249