Topic
Inflammaging
Everything we've written on Inflammaging — 9 articles covering the mechanism, the evidence, comparisons, and practical considerations.
9 articles
Anti-aging and cellular healthCellular senescence in deeper detail — the biology, biomarkers, and intervention frontierA cell under severe stress faces a choice. It can repair the damage and carry on. It can trigger apoptosis — the orderly self-destruction program that eliminates compromised cells cleanly. Or it can do something else: it can stop dividing, enlarge, change its behavior, and stay. This third option is cellular senescence, and for decades it was understood primarily as a tumor suppression mechanism — a way of permanently halting cells that might otherwise accumulate mutations and turn cancerous. That understanding was correct as far as it went. What took longer to recognize was the cost.12 min readImmune modulationThe cGAS-STING pathway — DNA in the wrong place and the inflammaging it triggersIn 2013, Zhijian "James" Chen's lab at UT Southwestern had a specific problem to solve. The innate immune system was known to respond vigorously to cytoplasmic DNA — DNA found floating in the cell's interior, outside the nucleus where it belongs — and this response was central to how cells defend against DNA viruses. But no one had identified the cytoplasmic sensor doing the detecting. There were candidate molecules. None had been confirmed. Chen's lab designed a biochemical reconstitution assay to find it, purifying the sensor from cells by tracking which fractions could trigger the known downstream response, and in the process identified an enzyme that, when it bound double-stranded DNA, produced a small signaling molecule: cyclic GMP-AMP, or cGAMP. The enzyme was cGAS — cyclic GMP-AMP synthase. The downstream receptor for cGAMP was already known: STING, the stimulator of interferon genes. The discovery completed a circuit that had been understood only in pieces, and it opened a window into one of the most consequential inflammatory pathways in aging biology.11 min readImmune modulationThe chronic inflammation pattern your labs missYou wake up stiff, and that takes longer to clear than it should. Your workout recovery takes three days now instead of one. By mid-afternoon there's a particular fog — not tired exactly, but thinking through wool, words slightly out of reach, the feeling that your processing speed has been dialed down. Your skin flares occasionally: a patch on your forearm, redness that comes and goes, something reactive. Your body feels somehow tipped toward inflammation without anything specific you can point to. The standard labs come back clean. CRP normal. ESR normal. CBC unremarkable. Metabolic panel fine. Your doctor says everything looks good. You don't feel good. The gap between what the labs show and what you're experiencing has a name, but the name is awkward: low-grade chronic inflammation. It is real, it is measurable with the right tools, it is consequential over time, and the standard inflammatory markers were not designed to find it.9 min readImmune modulationThe gut microbiome and aging — what changes and why it mattersIn a study published in Nature in 2021, researchers followed a cohort of people aged 18 to 101 and found something they hadn't entirely expected: in the oldest, healthiest individuals — the ones who were living well past 80 with minimal functional decline — the gut microbiome was distinctively and measurably different from the microbiome of age-matched people who were aging less well. The long-lived group had higher microbial diversity. They had more of certain bacterial species that produce beneficial metabolites. Their gut communities looked, in some ways, more like the communities found in younger healthy adults than like those of their struggling contemporaries.8 min readImmune modulationInflammaging — the chronic low-grade inflammation that drives agingIn 2000, an Italian immunologist named Claudio Franceschi published a paper that changed how aging biology thinks about its central problem. Franceschi had spent years studying centenarians — people who had reached one hundred years and beyond — and what he noticed was not just that they had survived to an unusual age, but how their immune systems were different. They had elevated inflammatory markers. Their baseline levels of IL-6, TNF-α, and CRP — the circulating proteins that signal tissue inflammation — were higher than younger adults. And yet they were extraordinarily healthy. They had reconciled, somehow, with an inflammatory burden that in most people would be associated with disease.7 min readAnti-aging and cellular healthAltered intercellular communication — how the body's cells stop talking clearlyIn 1956, a Cornell researcher named Clive McCay did something that sounds more like gothic fiction than gerontology: he surgically joined the bodies of an old rat and a young rat so that they shared a single bloodstream. Skin was sutured to skin, the two circulatory systems grew together, and for weeks the pair lived as one fused organism. When McCay examined the old animals afterward, their bones looked younger and denser than those of age-matched rats that had not been joined. The technique was called parabiosis, and the result hinted at something strange and important — that whatever ages a body is carried, at least in part, in the blood, and that the blood of the young carries something else. The experiment was crude, the animals suffered, and the field largely set it aside for half a century. Then, in the 2000s, it came roaring back.8 min readImmune modulationThe NLRP3 inflammasome — the molecular trigger for sterile inflammation in agingGout has been documented since the time of Hippocrates. It was called the disease of kings because it appeared disproportionately in wealthy men who ate meat and drank wine, and for most of medical history its mechanism was unknown — the joint swells, turns red, becomes exquisitely painful at the slightest touch, and then, after days, resolves. No infection explains it. No visible injury. The inflammation appears, peaks, and subsides as if triggered by something invisible.11 min readImmune modulationThe NLRP3 inflammasome — the molecular trigger for inflammagingLook across the major diseases that accumulate with age — atherosclerosis, type 2 diabetes, Alzheimer's disease, osteoarthritis, heart failure, Parkinson's — and a pattern emerges that has taken researchers several decades to fully appreciate. These are different diseases. They have different primary mechanisms, different clinical presentations, different genetic risk factors. But they share something at the inflammatory level: a chronic, low-grade, tissue-damaging background of immune activation that accelerates pathology in tissue-specific ways. The term coined for this is inflammaging, from immunologist Claudio Franceschi, and the question it raises is not whether inflammation is involved in aging-associated disease — that's established — but what the specific molecular machinery is that converts cellular stress and metabolic dysfunction into sustained inflammatory output.8 min readAnti-aging and cellular healthThe senescent cell story — what makes cells 'zombie cells'You cut your hand and it heals. The skin closes, the inflammation resolves, the scar fades over months. At no point do you consciously manage this — your body runs an intricate repair sequence without your input, and if you're young and healthy, the outcome is essentially complete restoration. What you don't see is the cellular machinery underneath that sequence: cells dividing to replace damaged ones, immune cells clearing debris, signaling molecules coordinating the whole operation with timing measured in hours. And somewhere in that process, certain cells that have served their purpose — that have divided as many times as they safely can, or that have accumulated damage that makes further division risky — enter a state from which they will not emerge. They stop dividing and stay stopped. They are still alive. They will not come back.8 min read