A proposed path to explaining the unexplained anemia of aging

Area of Science:

• Gerontology
• Hematology
• Internal Medicine

Background:

• Anemia is prevalent in individuals aged 65 and older, impacting 17% of this demographic.
• It is frequently listed as a secondary cause of death, highlighting its clinical significance.
• A substantial proportion (30%-50%) of anemia in older adults remains unexplained, termed unexplained anemia of aging (UAA).

Purpose of the Study:

• To discuss current knowledge and research opportunities regarding anemia in older adults.
• To explore potential mechanisms underlying unexplained anemia of aging (UAA).
• To identify future research priorities for diagnosing and intervening in UAA.

Main Methods:

• A workshop convened by the National Institute on Aging in 2024.
• Discussions covered epidemiology, clinical implications, and potential mechanisms of UAA.
• Review of previous clinical trials and consideration of diagnostic algorithms and machine learning.

Main Results:

• Key topics included low-grade inflammation's effect on erythropoiesis, microbiota's role in iron regulation, and clonal hematopoiesis (CH).
• The influence of senescence, aging on hematopoiesis, and sex hormones on stem cells were also discussed.
• Understanding these factors may reduce unexplained anemia and inform new diagnostic and intervention strategies.

Conclusions:

• UAA is a significant clinical concern with unknown mechanisms and progression.
• Further research into factors like inflammation, microbiota, and aging processes is crucial.
• Developing new diagnostic tools and therapeutic approaches is a priority to address UAA in the elderly.