Legs of Iron, Feet of Clay

Aging muscles lose strength above and beyond what would be expected from the mere loss of muscle mass. Accordingly, many drugs have been shown to stimulate muscle growth in older people, but the increased muscle mass consistently fails to translate into increased strength and physical function. To let people live independent lives for longer, we need damage-repair longevity therapeutics to repair the cellular and molecular damage that makes aging muscle dysfunctional.

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On the Surface: a New Path to Finding and Clearing Aged Cells

The Problem Early studies show that destroying senescent, or old and dysfunctional, cells can delay or even reverse diseases of aging and extend lifespan. The primary strategy for turning this into a therapy has been “senolytic” drugs that target signaling pathways that senescent cells need for survival. The Goal An alternative approach, targeting senescent cells …

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A Better Way to Create Rejuvenation Therapies

The Problem IPF is linked to the accumulation of senescent, or old, cells in the lung, creating scar tissue (fibrosis) which progressively stiffens them. This disables the patient, eventually suffocating them within 2-4 years. IPF creates a high burden of senescent cells in the lungs, and removing senescent cells powerfully impacts the disease. Previous drug …

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Activated Macrophages: a New Player in Senescence-Driven Damage

The Problem The immune system has an ability to patrol for and destroy senescent, or aged cells, a function which deteriorates over time, permitting senescent cells to accumulate and drive age-related disease. The negative impacts from senescence may actually result from a joint attack by both senescent cells and activated macrophages – a type of …

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Boosting Natural Defenses: Modifying Immune Cells to Target Senescence

The Problem The immune system, including natural killer cells (NK cells), has an ability to patrol for and destroy senescent, or aged cells. However, this protective function deteriorates over time, permitting senescent cells to accumulate in our tissues and drive age-related disease. Drugs used to destroy senescent cells – senolytics – use a brute-force method …

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Senolytics in Aging Muscle: Could the Cure Be Worse than the Disease?

Skeletal muscles are organized into long fibers, and when a fiber breaks the entire fiber is often lost. This made a supporter worry that senolytic therapies might break a muscle fiber and eliminate precious fibers in aging muscles. It appears that the injury at the heart of the questioner’s worry does not happen in practice.

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An Oil Change is Not a Gasket Change: Insights from the Interaction of “Old Blood” and Senolytic Therapy

When blood from a biologically aged animal is transfused into a young one, the young animal suffers “pro-aging” effects. By contrast, reducing the burden of “pro-aging” signaling factors in old blood is not enough to remove existing damage from a similar-aged mouse’s biologically aged tissues.

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