<i>Bcl2l1</i> Deficiency in Osteoblasts Reduces the Trabecular Bone Due to Enhanced Osteoclastogenesis Likely through Osteoblast Apoptosis.

We study T cell biology in health and disease. Our current study is divided into two parts. Part I is to investigate T lymphocyte-mediated anti-caner immunity. We have found that host complement inhibits the cytokine IL-10 production in CD8⁺ tumor infiltrating lymphocytes through complement receptors C3aR and C5aR. Complement-deficient animals are resistant to tumor development in a T cell- and IL-10-dependent manner. CD8⁺ tumor infiltrating T cells express IL-10 when complement signaling is disabled. We found that tumor infiltrating lymphocytes from human cancers expanded with IL-2 plus IL-10 are potent tumor killers. Complement-mediated inhibition on antitumor immunity is independent of the PD-1/PD-L1 immune checkpoint pathway. Our findings suggest that complement receptors C3aR and C5aR expressed on CD8⁺ tumor infiltrating lymphocytes represent a novel class of immune checkpoints that needs to be targeted for tumor immunotherapy. Our current effort is to enhance cancer immunotherapy through several strategies. First, we investigate a combined blockade of complement signaling and anti-PD-1 to enhance the antitumor efficacy; second, we are studying the antitumor efficacy of a targeted delivery of IL-10 to antitumor CD8⁺ T cells by using anti-PD1-IL-10 or anti-CTLA-4-IL-10 fusion proteins; third, we are studying the tumor killing efficacy of addition of IL-10 in the expansion protocol of tumor infiltrating lymphocytes for adaptive cellular therapy.

Part II is to investigate the intracellular process termed autophagy in T lymphocyte function. Autophagy is a highly conserved self-digestion pathway that plays essential roles in maintaining the homeostasis of organelles, degrading long-lived proteins and recycling amino acids under starvation conditions. We have found that autophagy related molecules are expressed in T lymphocytes and autophagy occurs inside T lymphocytes. We have generated autophagy-deficient T lymphocytes in multiple genetic models and investigated the roles of autophagy in T lymphocytes. We found that autophagy plays a critical role in T lymphocyte function. Our current effort is to elucidate the molecular pathways by which TCR signal induces autophagy and the impact of autophagy on intracellular organelle homeostasis in dividing T cells.