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Scientific Fields
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Published in Blood Advances - 12 Jan 2021

Surace L, Doisne JM, Escoll P, Marie S, Dardalhon V, Croft C, Thaller A, Topazio D, Sparaneo A, Cama A, Musumeci O, d'Ecclesia A, Buchrieser C, Taylor N, Di Santo JP,

Link to Pubmed [PMID] – 33570622

Link to DOI – 10.1182/bloodadvances.2020003458

Blood Adv 2021 Jan; 5(1): 26-38

Distinct metabolic demands accompany lymphocyte differentiation into short-lived effector and long-lived memory cells. How bioenergetics processes are structured in innate natural killer (NK) cells remains unclear. We demonstrate that circulating human CD56Dim (NKDim) cells have fused mitochondria and enhanced metabolism compared with CD56Br (NKBr) cells. Upon activation, these 2 subsets showed a dichotomous response, with further mitochondrial potentiation in NKBr cells vs paradoxical mitochondrial fission and depolarization in NKDim cells. The latter effect impaired interferon-γ production, but rescue was possible by inhibiting mitochondrial fragmentation, implicating mitochondrial polarization as a central regulator of NK cell function. NKDim cells are heterogeneous, and mitochondrial polarization was associated with enhanced survival and function in mature NKDim cells, including memory-like human cytomegalovirus-dependent CD57+NKG2C+ subsets. In contrast, patients with genetic defects in mitochondrial fusion had a deficiency in adaptive NK cells, which had poor survival in culture. These results support mitochondrial polarization as a central regulator of mature NK cell fitness.

https://pubmed.ncbi.nlm.nih.gov/33570622