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LCN2 is an osteoblast-enriched secreted protein that regulates food intake. Here, the authors show that LCN2 is upregulated during obesity and diabetes as a protective mechanism to counteract obesity-induced glucose intolerance by decreasing food intake and promoting adaptive β-cell proliferation.

Patients with severe developmental delay, dysmorphism, and brain abnormalities were identified as having pathogenic mutations in EXOC2, a critical component of the exocyst complex involved in vesicle trafficking, which caused secretory vesicle transport defects in patient-derived cell lines.

Delgado-Benito et al. identify the protein Pdap1 as a regulator of mature B cell homeostasis. Pdap1 protects mature B cells against chronic induction of the integrated stress response and promotes both their survival and antibody gene diversification by CSR and SHM.

CCMs arise due to increased MEKK3-KLF2/4 signaling in brain endothelial cells, but the downstream mechanisms of CCM formation remain unclear. Hong et al. show that expression of the ADAMTS5 protease and proteolytic cleavage of the matrix proteoglycan versican by CCM-deficient endothelial cells contribute to CCM formation.

We explored the nature of the human CD4 T cell immunodominance to influenza H1 hemagglutinin and demonstrate that the naïve repertoire is very broad, while the memory repertoire becomes selected toward peptides with a high likelihood to be processed and presented by dendritic cells.

FcRn and CD32a form a ternary complex under acidic conditions and act together in determining responses to IgG immune complexes. The human autoimmune disease–associated CD32a-H131 variant more avidly forms this ternary complex, leading to greater FcRn-dependent immune responses to IgG.

Single-cell transcriptomic analysis of germinal center B cells identifies multiple linked populations, most of which represent cell of origin of lymphomas. The newly identified cell of origin of diffuse large B cell lymphoma informs on novel prognostic subgroups.

This study shows that IgG memory B cells developing in HBV vaccinees and in rare individuals able to naturally control chronic HBV infection express a panoply of neutralizing antibodies, some of which are potent viremia suppressors in vivo.

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