The OSTF1 Knockout Raji Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the Raji B lymphocyte line, with targeted disruption of the OSTF1 gene. This polyclonal pool enables loss-of-function studies while preserving genetic diversity, providing a versatile model for investigating OSTF1-dependent processes in a lymphoid context. Applications include bone biology, signal transduction, and B-cell lymphoma research.
Raji cells are an immortalized human B lymphocyte line from a Burkitt??s lymphoma, commonly used in immunological and cancer studies for antibody production and antigen presentation. These suspension cells offer a robust system for examining signaling pathways relevant to lymphocyte function and malignancy. The OSTF1 knockout in this background allows dissection of its roles beyond osteoclasts, utilizing established Raji-based assays.
OSTF1 encodes a cytoplasmic adaptor that stimulates osteoclast activity by activating SRC kinase, leading to cortactin phosphorylation and actin ring formation. Its expression is upregulated by TNFSF11 (RANKL), TNF, and CSF1, and it functions within the RANK/TRAF6/NFATC1 pathway. Through physical interactions with SRC and cortactin, and with SH3P2, OSTF1 facilitates cytoskeletal reorganization essential for bone resorption. In B lymphocytes, this adaptor may similarly modulate adhesion or signaling complexes, but its precise role remains to be defined. CRISPR-mediated disruption of OSTF1 thus impairs SRC-dependent signaling and actin dynamics.
Though OSTF1 is primarily studied in osteoclasts, its expression in B cells suggests roles in immune adhesion or signaling. This knockout model enables exploration of these functions in the context of B-cell lymphoma, where actin remodeling and SRC signaling influence invasion and metastasis. Relevant disease areas include bone metastases, osteoporosis, and osteopetrosis, where osteoclast?Ctumor interactions are critical. The Raji polyclonal knockout thus serves as a tool to investigate OSTF1??s contribution to cancer cell motility and survival.
Researchers can use the cells for Western blotting and RT-qPCR to verify knockout, co-immunoprecipitation to detect SRC?COSTF1 interaction, and immunofluorescence for actin organization. Functional assays include migration tests, flow cytometry for proliferation, and osteoclast differentiation co-cultures to assess paracrine signaling. Phospho-SRC detection further enables dissection of downstream signaling. For additional information, contact Ascent Research.
