Age-related taste loss stems from impaired stem cell regeneration in taste buds, driven by inflammatory macrophage accumulation that releases inhibitory signals blocking taste cell growth. This mechanism connects taste dysfunction to broader age-associated inflammation and suggests specific molecular targets for intervention.
Key Points
- Aging depletes taste bud stem cells primarily in posterior tongue regions
- M1 macrophages accumulate with age and suppress taste cell regeneration
- Macrophage-derived Thbs1 protein directly inhibits taste progenitor expansion
Longevity Analysis
Taste dysfunction accelerates nutritional decline and frailty in aging populations, yet remains mechanistically underexplored. This work maps how inflamm-aging—the chronic, systemic low-grade inflammation of aging—localizes to sensory tissues and compromises their regenerative capacity. The identification of macrophage polarization as a reversible driver means the immune environment of taste tissues can potentially be remodeled to restore function. Rather than treating taste loss as inevitable, this research suggests the barrier to regeneration is removable: the inflammatory niche constrains stem cell behavior, not the stem cells themselves. Understanding how local immune signals suppress tissue-specific regeneration across multiple organ systems becomes a central strategy for maintaining metabolic function and quality of life in older adults.
Original published by Wiley Aging Cell, by Wandong Zhao, Xudong Cha, Yingqi Xie, Enhao Wang, Wenlu Xing, Zengyi Xu, Langchao Liang, Changhai Xiong, Morong Zhou, Penghui Fu, Zhe Wang, Xin Liu, Yiqun Yu, Huanhai Liu, Hanbo Li, Wenwen Ren .