# Can Sermorelin improve immune function in aging dogs? Canonical source: https://retacompare.com/research/can-sermorelin-improve-immune-function-in-aging-dogs Peptide Longevity Q&A · 2025-01-01 Research indicates that Sermorelin, through GHRH-encoding plasmid therapy, may enhance immune function in aging dogs. A study showed increased T cell populations and improved clinical well-being in senior dogs, suggesting potential benefits for immune modulation and overall health in aged canines. What the research shows The study evaluated the effects of a canine growth hormone-releasing hormone (GHRH) therapy delivered via a plasmid and electroporation in 30 healthy senior dogs aged 10-16 years. The dogs received a single intramuscular injection and were monitored over a period of 180 days. Clinical scores significantly improved, with 90% of the dogs exhibiting increased well-being as assessed by their owners. Improvements included better appetite, increased activity, and enhanced exercise tolerance. Limb thickness, a surrogate measure for muscle mass, increased significantly in both hindlimbs by day 180. While mean serum IGF-1 levels did not change overall, dogs with low baseline IGF-1 levels (<90 ng/mL) showed substantial increases, while those with high baseline levels tended to decrease. Flow cytometry analysis demonstrated increases in total CD3+ T cells, including naive CD4+ and CD8+ T cell subsets, indicating a potential delay in immunosenescence. The therapy was well-tolerated, with no serious adverse effects reported. Why it matters for longevity The findings suggest that Sermorelin may play a role in enhancing immune function in aging populations, which is crucial for maintaining healthspan. Immunosenescence, characterized by a decline in immune system function, increases susceptibility to diseases in older individuals. By improving T cell populations and overall clinical well-being, Sermorelin could contribute to healthier aging in dogs, and potentially in humans as well. This research supports the idea that interventions targeting the GHRH-GH-IGF-1 axis may have broader implications for longevity and age-related health issues. Key findings at a glance 30 healthy senior dogs aged 10-16 years were studied. 90% of dogs showed improved well-being based on owner assessments. Limb thickness increased significantly in both hindlimbs by day 180. Dogs with low baseline IGF-1 levels experienced substantial increases in IGF-1. Increased populations of total CD3+ T cells and naive CD4+ and CD8+ T cells were observed. The therapy was well-tolerated, with transient gastrointestinal symptoms. How Sermorelin works (background) Sermorelin is a synthetic peptide that stimulates the release of growth hormone from the pituitary gland. It mimics the action of growth hormone-releasing hormone (GHRH), which plays a critical role in the growth hormone (GH) and insulin-like growth factor 1 (IGF-1) axis. This axis is essential for somatic growth, metabolism, and immune modulation. By enhancing GH release, Sermorelin may promote muscle growth, improve metabolic health, and modulate immune responses, which are particularly important in aging populations. Safety, caveats, and what we don't yet know While the study indicated that the GHRH-encoding plasmid therapy was well-tolerated and did not result in serious adverse effects, the research is still in its early stages. Limitations include the small sample size and the specific population of healthy senior dogs, which may not generalize to other species or age groups. Further studies are needed to explore long-term efficacy, optimal dosing, and potential effects in humans, as well as to identify any long-term safety concerns associated with this therapy. Bottom line Sermorelin may enhance immune function in aging dogs, as evidenced by improved clinical scores and increased T cell populations in a study of healthy senior dogs. This suggests potential benefits for overall health and longevity. Related questions Does Sermorelin help with age-related muscle loss? Research suggests that Sermorelin may promote muscle growth by stimulating growth hormone release, which could help mitigate age-related muscle loss in aging populations. Can Sermorelin influence cognitive function in older animals? While the current study did not directly assess cognitive function, improvements in overall well-being and activity levels may indirectly support cognitive health in aging dogs. Is Sermorelin safe for long-term use in aging dogs? The study indicated that Sermorelin therapy was well-tolerated in the short term, but further research is necessary to evaluate the long-term safety and efficacy in aging populations. Source: PubMed · Front Vet Sci · published 2025-01-01. ## Sources - PubMed · Front Vet Sci: https://pubmed.ncbi.nlm.nih.gov/41030680/