MICU1 Knockout Raji Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the Raji human B lymphocyte line, engineered for targeted disruption of the MICU1 gene (mitochondrial calcium uptake 1). This product provides a heterogeneous pool of edited cells with loss-of-function mutations in MICU1, enabling the study of mitochondrial calcium (Ca2+) signaling without clonal selection. The polyclonal format retains population-level diversity, making it suitable for bulk assays investigating MICU1-dependent phenotypes in a B-cell lymphoma background.
Raji cells are an Epstein?CBarr virus (EBV)-positive, immortalized B lymphocyte line originally derived from a patient with Burkitt lymphoma. They serve as a widely used model for B-cell biology and lymphomagenesis, characterized by active B-cell receptor signaling, constitutive activation of survival pathways, and well-characterized mitochondrial physiology. This host cell background provides a relevant immunological context for dissecting the role of mitochondrial Ca2+ handling in lymphoma development, apoptosis regulation, and metabolic adaptation.
MICU1 encodes a regulatory subunit of the mitochondrial calcium uniporter (MCU) complex, where it functions as a Ca2+-sensing gatekeeper. At resting cytosolic Ca2+ concentrations, MICU1, in cooperation with MICU2, inhibits MCU channel activity to prevent mitochondrial Ca2+ overload. Following cellular stimulation, cytosolic Ca2+ elevation??mediated by upstream regulators such as IP3 receptor activation, store-operated Ca2+ entry via STIM1/ORAI1, and CaMKII??promotes MICU1 conformational changes that relieve inhibition, allowing rapid mitochondrial Ca2+ uptake through the MCU pore formed by MCU, MCUb, and EMRE. This influx activates Ca2+-sensitive TCA cycle dehydrogenases (pyruvate dehydrogenase and ??-ketoglutarate dehydrogenase), stimulates ATP synthesis, modulates reactive oxygen species (ROS) production, and influences opening of the mitochondrial permeability transition pore (mPTP). MICU1 also interacts with VDAC and GRP75 at the mitochondria-associated membrane interface, linking it to broader calcium signaling networks.
In Raji B lymphocytes, MICU1-dependent mitochondrial Ca2+ handling is critical for coupling cellular activation to metabolic outputs and for determining apoptosis sensitivity. Disruption of MICU1 function in these polyclonal knockout cells is expected to alter MCU complex responsiveness to cytosolic Ca2+ fluctuations, impacting ATP generation, redox balance, and mPTP-dependent death pathways. This model is particularly relevant for Burkitt lymphoma research, where mitochondrial calcium dysregulation may contribute to oncogenic signaling, resistance to chemotherapeutics, and altered immune cell responses. The polyclonal nature of the knockout population allows assessment of heterogeneous editing outcomes on these phenotypes.
Typical research applications include investigating mitochondrial Ca2+ dynamics in B-cell lymphoma by live-cell imaging with Rhod-2 AM or mito-GCaMP, profiling metabolic changes using Seahorse flux analysis, evaluating apoptosis resistance via Annexin V/PI staining, and screening for modulators of mitochondrial calcium uptake. The cells can also be employed in co-immunoprecipitation studies with MCU complex members, drug sensitivity assays, and flow cytometry-based survival marker analysis. These polyclonal knockout cells provide a flexible tool for dissecting MICU1 function in lymphocyte biology and lymphoma pathology. For additional information or to request a quote, please contact Ascent Research.
