PEP/NEWS — Peptide intel. Daily.

Using fibre photometry in live mice, researchers mapped how kisspeptin neuron population activity ramps and oscillates across the estrous cycle to trigger the GnRH surge that drives ovulation. The findings clarify the upstream neuroendocrine architecture underpinning reproductive hormone timing — relevant context for kisspeptin-based fertility and hormonal optimization research.

The first prospective trial combining rapamycin with structured exercise failed to show additive benefit, a result Attia argues reflects trial design limitations rather than a fatal blow to mTOR-based geroprotection. A useful reality check on translating animal lifespan data into human protocols.

New comparative mouse data shows that a robust and timely senescent cell activation is required for efficient wound closure — younger animals do it better, and the deficit in older animals reflects blunted senescence signaling, not excess. The finding complicates blanket senolytic strategies applied during active healing.

T cells appear to retain a pro-inflammatory phenotype for weeks in mice — and potentially years in humans — after normal weight is restored following obesity, suggesting metabolic memory in the adaptive immune system. Critical context for GLP-1 class users who achieve rapid weight normalization but may carry residual inflammatory burden.

Researchers in Aging Cell have mapped how age-associated microbiome shifts trigger transcriptional dysregulation in intestinal epithelium, progressively impairing the mucosal immune barrier. The mechanistic clarity here opens a legible target window for microbiome-directed and peptide-based gut repair interventions.

A review in Aging Cell argues melatonin should be reframed from passive antioxidant to active Leydig cell repair agent, with senescence reversal as its primary mechanism in late-onset hypogonadism. If the pathway holds, it positions melatonin as a meaningful adjunct in male hormonal optimization protocols.

Old mice receiving plasma dilution following myocardial ischemia-reperfusion injury showed improved cardiac remodeling, heart output, and physical endurance relative to controls. The data adds to a growing body supporting circulating factor dilution as a tractable aging intervention.

Advanced glycation endproducts suppress SIRT1 in joint tissue, activating RANKL-dependent osteoclast signaling and pushing chondrocytes into senescence — a mechanistic account of how dietary and metabolic AGE burden accelerates joint degeneration.

A Nature Aging perspective argues the aging ECM creates a physical and biochemical niche that promotes senescent cell persistence — reframing ECM remodeling as a first-order target for senolytic and rejuvenation strategies.

Altos Labs, the best-funded bet on partial epigenetic reprogramming, is stepping out of stealth with a clearer public narrative. Fight Aging! parses the messaging — useful context on where the most capital-intensive edge of longevity science is heading.

Attia's latest AMA covers NAD supplementation evidence, metabolic health prioritization, strength training efficiency for busy schedules, and dementia risk reduction — a broad longevity-relevant sweep from one of the field's most rigorous clinical voices.