Research Roundup: Proinsulin Processing, Hemocyanin Fucosylation, and Seismocardiography

A randomized clinical trial of 90 adults with type 2 diabetes compared eight weeks of basal insulin glargine alone, glargine plus thrice‑daily lispro, and glargine plus twice‑daily exenatide. The authors report that both A1c and fasting serum proinsulin:C‑peptide ratio (PI:C) decreased progressively across the three arms, while multiple measured indices of insulin sensitivity and four different measures of beta‑cell compensation did not differ between groups. Mediation analysis identified fasting PI:C as the sole biologic mediator of the A1c effects for the two combination arms versus glargine alone. The investigators conclude that improved proinsulin processing may explain glucose lowering observed in this trial without detectable improvement in conventional measures of beta‑cell compensation.

The shrimp immunology study used biochemical pull‑downs with LC‑MS/MS and GST pull‑down assays to show that highly fucosylated Penaeus vannamei hemocyanin (PvHMC) preferentially associates with the ER chaperone PvBip. Functional experiments reported that High‑Fuc‑PvHMC enhanced a PvBip–PvXbp1s–associated ER stress response and increased transcription of several antimicrobial peptides (PvPEN2, PvLYZ2, PvALF2, PvALF3); these effects were attenuated by the ER stress inhibitor 4‑PBA. In vivo, High‑Fuc‑PvHMC was associated with lower hemolymph Vibrio loads and improved shrimp survival after Vibrio parahaemolyticus challenge, whereas reduction of PvHMC fucosylation or ER stress inhibition weakened protection. The authors present this axis as a mechanistic link between a post‑translational modification and intracellular immune signaling in crustaceans.

A feasibility study evaluated seismocardiography (SCG) algorithms for heart‑failure detection in 218 subjects (198 with suspected HF and 20 known HFrEF cases used for testing). The SCG‑based AnyHF score yielded an AUC of 82% with high sensitivity (90.9%) but modest specificity (43.8%), while an HFrEF‑score had AUC 92.9%, sensitivity 88.2% and specificity 92%. NT‑proBNP was also analyzed and showed an AUC of 94.7% with higher sensitivity but lower specificity versus the HFrEF‑score. The authors report that SCG algorithms categorized many referred patients as minimal risk and suggest potential clinical utility, while framing the work as a feasibility analysis that requires further validation and comparative evaluation against established biomarkers and clinical outcomes.