Adoptive Transfer of T Cells as a Potential Therapeutic Approach in the Bleomycin-Injured Mouse Lung

Idiopathic pulmonary fibrosis (IPF) is a lethal disease with an unknown etiology and complex pathophysiology that are not fully understood. The disease involves intricate cellular interplay, particularly among various immune cells. Currently, there is no treatment capable of reversing the fibrotic process or aiding lung regeneration. Hepatocyte growth factor (HGF) has demonstrated antifibrotic properties, whereas the adoptive transfer of modified T cells is a well-established treatment for various malignancies. We aimed to understand the dynamics of T cells in the progression of lung fibrosis and to study the therapeutic benefit of adoptive T cell transfer in a bleomycin-injured mouse lung (BLM) model.

T cells were isolated from the spleen of naïve mice and transfected in vitro with mouse HGF plasmid and were administered intratracheally to the mice lungs 7 days post-bleomycin injury to the lung. Lung tissue and bronchoalveolar lavage were collected and analyzed using flow cytometry, histology, qRT-PCR, ELISA, and hydroxyproline assay.

Our findings demonstrate the successful T cell therapy of bleomycin-induced lung injury through the adoptive transfer of HGF-transfected T cells in mice. This treatment resulted in decreased collagen deposition and a balancing of immune cell exhaustion and cytokine homeostasis compared with untreated controls. In vitro testing showed enhanced apoptosis in myofibroblasts induced by HGF-overexpressing T cells.

Taken together, our data highlight the great potential of adoptive T cell transfer as an emerging therapy to counteract lung fibrosis.