Long-Lived Plasma Cells (LLPCs) are an integral part of long-term protective humoral immunity. They can live for decades, unlike Short-Lived Plasma Cells (SLPCs), and continuously produce antibody regardless of antigen stimulation, unlike Memory B Cells (MBCs).
LLPCs are critical for the sustained protective immunity against pathogens that are only intermittently present in a population but can cause significant morbidity/mortality when active—such as epidemic diseases. What drives B cell differentiation specifically to the LLPC lineage is still not fully understood; there is conflicting information on what drives the fate decisions for MBCs vs.
SLPCs vs. LLPCs.
Evidence suggests that although LLPC and SLPC have similar gene transcriptional profiles they differ significantly in their metabolic profiles–likely due to the demands of prolonged continuous antibody production in LLPC. These metabolic changes include increased uptake of metabolic substrates, increased mitochondrial mass/function and enhanced fuel availability via lipophagy, and enhanced proteostasis to remove misfolded proteins.
Frontiers in Immunology published a clinical update in Infectious Disease on 07 May 2026.
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