Nature子刊：刘一为/张浩/聂宇合作证实，减轻心脏负荷，可重启成年心脏再生

TL;DR - A Nature Cardiovascular Research paper (Aug 5, 2026) from Shanghai Children's Medical Center (Zhang Hao / Liu Yiwei) and Fuwai Hospital (Nie Yu) shows that mechanically unloading the adult heart reawakens cardiomyocyte proliferation via an epicardial NRG1–ERBB4–STAT3 axis, offering a mechanistic rationale for why ventricular assist devices (VADs) sometimes restore cardiac function. Note: this item is biomedical research with no AI/ML component beyond standard sequencing analysis.

• Using a heterotopic (non-working) heart transplant model, mechanical unloading induced adult cardiomyocyte proliferation, confirmed by Ki67 staining and MADM dual-label lineage tracing; applied to infarcted hearts it also promoted regeneration in the peri-infarct zone.
• Single-nucleus RNA sequencing of unloaded hearts revealed enhanced epicardium-to-cardiomyocyte communication through the NRG1–ERBB4–STAT3 signaling axis.
• Epicardial Nrg1 knockout abolished STAT3 activation and blocked cardiomyocyte proliferation, establishing the pathway as required rather than merely correlated.
• CUT&Tag showed STAT3 directly upregulates H6pd, boosting pentose phosphate pathway flux to supply nucleotides and reducing equivalents for cell-cycle re-entry — linking mechanotransduction to metabolic remodeling.

TL;DR — A Genentech team publishing in Nature (28 July 2026) turned gasdermin D (GSDMD) membrane pores into a drug-entry route, using cell-impermeable covalent caspase inhibitors that only reach cells already undergoing pyroptosis, blocking IL-1β/IL-18 release without touching healthy cells. Note: this is a chemical-biology/therapeutics paper with no AI/ML component.

• Substrate profiling with a hybrid combinatorial library (HyCoSuL) showed human caspase-1/4/5 prefer His at P2, Glu at P3, and bulky aromatic residues at P4; ~100 tetrapeptide inhibitors bearing acyloxymethyl ketone (AOMK) warheads were synthesized for covalent, irreversible binding.
• Three low-permeability leads (KGR-3, KGR-23, KGR-72) selectively suppressed pyroptosis and IL-1β secretion while sparing caspase-driven apoptosis, since non-pyroptotic cells lack pores — avoiding the toxicity that sank cell-permeable pan-caspase inhibitors.
• Because pore formation races ESCRT-mediated membrane repair and proceeds asynchronously, dosing hours after pyroptosis onset still halted further cell death, implying a wide therapeutic window.
• In vivo, KGR-53P (a charge-neutralized P3 variant designed for better pore passage) inhibited caspase-11 and reduced IL-1β/IL-18 in an LPS endotoxic shock mouse model, establishing "pore-mediated delivery" as a general paradigm potentially extensible to sepsis, ARDS, and COVID-19.

TL;DR - A Nature Cell Biology paper (Aug 7, 2026) from Chen Hangzi's team at Xiamen University identifies the HSPA9–OGDH–METTL3–NRF2 axis as the mechanism melanoma cells use to escape disulfidptosis under glucose starvation, suggesting a combination-therapy strategy. Note: this item is cancer cell biology, not AI research.

• Disulfidptosis, first defined in 2023 (Gan/Chen, MD Anderson), is glucose-deprivation-induced disulfide-stress cell death; tumor escape from it enables survival in glucose-limited niches.
• Mechanism: TCA-cycle rate-limiting enzyme OGDH generates succinyl-CoA, which succinylates METTL3; succinylated METTL3 recognizes m⁶A marks in the NRF2 mRNA coding region, boosting NRF2 translation and TrxR1 expression to block disulfidptosis.
• HSPA9 is upstream, protecting OGDH from oxidative inactivation during glucose deprivation.
• Translational evidence: combined HSPA9 inhibition plus glucose-uptake blockade suppressed melanoma growth in mice; in patients, HSPA9/OGDH levels inversely correlate with disulfidptosis signatures and associate with poor prognosis.

TL;DR - A Chinese multi-institution team (Fudan, Xinhua Hospital/SJTU, SIOC) reports in a Nature-family journal that metabolic reprogramming can convert pancreatic α cells into insulin-producing β-like cells and improve diabetes symptoms. Note: this is a wet-lab biology paper with no AI/ML component described.

• Loss of functional β cells defines diabetes; converting islet non-β cells (α cells) into insulin producers is a long-standing but clinically unrealized strategy.
• PRC2 inhibitors were found to promote β-cell-enriched gene expression in α cells by acting through the AR–ETV1 complex.
• AR inhibition suppressed glycogen synthesis and enhanced the pentose phosphate pathway (PPP).
• Directly supplying a PPP intermediate, methyl 6-phosphogluconate, reprogrammed α cells toward β-like identity, drove β cell neogenesis, and ameliorated diabetes in the reported models.
• Caveat: the post cites Nature Metabolism but the linked DOI (s41589-026-02293-z) corresponds to a different Nature journal; publication venue/date could not be verified from the content given.