A Long-lived Mouse Lacking Both Growth Hormone and Growth Hormone Receptor: A New Animal Model for Aging Studies.
Level 5 - mechanism / opinion, no new human data
Animal model study
PubMed 27688483 · doi:10.1093/gerona/glw193
What was done
Researchers crossed growth hormone (GH)-deficient Ames dwarf mice (df/df) with GH receptor knockout mice (GHRKO) to generate a double-deficient mouse line (df/KO) lacking both GH and its receptor. They evaluated body size, metabolic health-span markers (glucose tolerance and adiponectin levels), and lifespan compared with normal controls, Ames dwarf mice, and GHRKO mice.
What was found
The abstract does not report numerical data. Directionally, df/KO mice exhibited reduced body size, improved glucose tolerance, and increased adiponectin levels. Longevity experiments showed that df/KO mice lived longer than normal control mice, but they did not live longer than GHRKO or Ames dwarf mice.
Why it matters
The findings demonstrate that completely silencing the GH axis via dual genetic disruption does not produce additive lifespan extension beyond single-knockout models, despite additional improvements in selected metabolic markers.
Limits
This is an animal study, limiting direct translation to human aging. The abstract provides no sample sizes, numerical lifespan statistics, survival curve metrics, or quantitative biochemical values. Potential sex differences and specific causes of death were not reported in the abstract.
Cited by
- supports Mice with growth hormone receptor deficiency or growth hormone deficiency live approximately 40% longer than control mice.