GLI1+ Cells Contribute to Vascular Remodeling in Pulmonary Hypertension.
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Chu Xuran, Kheirollahi Vahid, Lingampally Arun, Chelladurai Prakash, Valasarajan Chanil, Vazquez-Armendariz Ana Ivonne, Hadzic Stefan, Khadim Ali, Pak Oleg, Rivetti Stefano, Wilhelm Jochen, Bartkuhn Marek, Crnkovic Slaven, Moiseenko Alena, Heiner Monika, Kraut Simone, Atefi Leila Sotoodeh, Koepke Janine, Valente Guilherme, Ruppert Clemens, Braun Thomas, Samakovlis Christos, Alexopoulos Ioannis, Looso Mario, Chao Cho-Ming, Herold Susanne, Seeger Werner, Kwapiszewska Grazyna, Huang Xiaoying, Zhang Jin-San, Pullamsetti Soni Savai, Weissmann Norbert, Li Xiaokun, El Agha Elie, Bellusci Saverio
Аннотация
METHODS: Gli1Cre-ERT2; tdTomatoflox mice were used to lineage trace GLI1+ (glioma-associated oncogene homolog 1-positive) cells in the context of pulmonary hypertension using 2 independent models of vascular remodeling and reverse remodeling: hypoxia and cigarette smoke exposure. Hemodynamic measurements, right ventricular hypertrophy assessment, flow cytometry, and histological analysis of thick lung sections followed by state-of-the-art 3-dimensional reconstruction and quantification using Imaris software were used to investigate the contribution of GLI1+ cells to neomuscularization of the pulmonary vasculature.
RESULTS: The data show that GLI1+ cells are abundant around distal, nonmuscularized vessels during steady state, and this lineage contributes to around 50% of newly formed ACTA2+ cells around these normally nonmuscularized vessels. During reverse remodeling, cells derived from the GLI1+ lineage are largely cleared in parallel to the reversal of muscularization. Partial ablation of GLI1+ cells greatly prevented vascular remodeling in response to hypoxia and attenuated the increase in right ventricular systolic pressure and right heart hypertrophy. Single-cell RNA sequencing on sorted lineage-labeled GLI1+ cells revealed an Acta2high fraction of cells with pathways in cancer and MAPK (mitogen-activated protein kinase) signaling as potential players in reprogramming these cells during vascular remodeling. Analysis of human lung-derived material suggests that GLI1 signaling is overactivated in both group 1 and group 3 pulmonary hypertension and can promote proliferation and myogenic differentiation.
CONCLUSIONS: Our data highlight GLI1+ cells as an alternative cellular source of VSMCs in pulmonary hypertension and suggest that these cells and the associated signaling pathways represent an important therapeutic target for further studies.