Tm9sf4-KO Mouse

TM9SF4, a member of the transmembrane 9 superfamily, has diverse functions. It is involved in regulating F-actin dynamics, which is crucial for cancer cell motility, and also in processes like autophagy, cell adhesion, and transmembrane domain sorting. It may play roles in multiple signaling pathways such as mTOR-related pathways [1,4].

In ovarian cancer, knockdown of TM9SF4 in cell lines and in vivo (athymic nude mice) reduces cell migration, invasion, tumor growth, and metastasis, suggesting it promotes tumor progression by regulating actin dynamics [1].

In IBD mouse models, genetic knockout of TM9SF4 aggravates disease symptoms, as it promotes inflammation, increases ER stress, disrupts epithelial barrier function, and affects macrophage polarization [2].

In osteoporosis research, TM9SF4 -/- mice show higher bone mass and less lipid accumulation in trabecular bones after ovariectomy, with TM9SF4 -/- bone marrow mesenchymal stem cells having a higher potential to differentiate into osteoblasts [3].

In conclusion, TM9SF4 is essential in processes related to cancer, inflammation, and bone homeostasis. The use of gene knockout mouse models has revealed its role in promoting tumor progression in ovarian cancer, aggravating IBD, and regulating osteoporosis, providing valuable insights into potential therapeutic targets for these diseases.