Impaired TRIM16-Mediated Lysophagy in Chronic Obstructive Pulmonary Disease Pathogenesis

• Published in: The Journal of immunology (1950) 2021-07, Vol.207 (1), p.65-76
• Main Authors: Araya, Jun, Saito, Nayuta, Hosaka, Yusuke, Ichikawa, Akihiro, Kadota, Tsukasa, Fujita, Yu, Minagawa, Shunsuke, Hara, Hiromichi, Fujimoto, Shota, Kawamoto, Hironori, Watanabe, Naoaki, Ito, Akihiko, Okuda, Keitaro, Miyagawa, Hanae, Watanabe, Junko, Takekoshi, Daisuke, Utsumi, Hirofumi, Yoshida, Masahiro, Hashimoto, Mitsuo, Wakui, Hiroshi, Ito, Saburo, Numata, Takanori, Mori, Shohei, Matsudaira, Hideki, Hirano, Jun, Ohtsuka, Takashi, Nakayama, Katsutoshi, Kuwano, Kazuyoshi
• Format: Article
• Language: English
• Subjects: Cells, Cultured; Humans; Hydrogen-Ion Concentration; Lysosomes - immunology; Pulmonary Disease, Chronic Obstructive - immunology; Pulmonary Disease, Chronic Obstructive - pathology; Tripartite Motif Proteins - immunology; Ubiquitin-Protein Ligases - immunology
• ISSN: 0022-1767; 1550-6606
• DOI: 10.4049/jimmunol.2001364

Insufficient autophagic degradation has been implicated in accelerated cellular senescence during chronic obstructive pulmonary disease (COPD) pathogenesis. Aging-linked and cigarette smoke (CS)-induced functional deterioration of lysosomes may be associated with impaired autophagy. Lysosomal membrane permeabilization (LMP) is indicative of damaged lysosomes. Galectin-3 and tripartite motif protein (TRIM) 16 play a cooperative role in recognizing LMP and inducing lysophagy, a lysosome-selective autophagy, to maintain lysosome function. In this study, we sought to examine the role of TRIM16-mediated lysophagy in regulating CS-induced LMP and cellular senescence during COPD pathogenesis by using human bronchial epithelial cells and lung tissues. CS extract (CSE) induced lysosomal damage via LMP, as detected by galectin-3 accumulation. Autophagy was responsible for modulating LMP and lysosome function during CSE exposure. TRIM16 was involved in CSE-induced lysophagy, with impaired lysophagy associated with lysosomal dysfunction and accelerated cellular senescence. Airway epithelial cells in COPD lungs showed an increase in lipofuscin, aggresome and galectin-3 puncta, reflecting accumulation of lysosomal damage with concomitantly reduced TRIM16 expression levels. Human bronchial epithelial cells isolated from COPD patients showed reduced TRIM16 but increased galectin-3, and a negative correlation between TRIM16 and galectin-3 protein levels was demonstrated. Damaged lysosomes with LMP are accumulated in epithelial cells in COPD lungs, which can be at least partly attributed to impaired TRIM16-mediated lysophagy. Increased LMP in lung epithelial cells may be responsible for COPD pathogenesis through the enhancement of cellular senescence.