Mediterranean Diet's Secret Revealed: Mitochondrial Microproteins Humanin and SHMOOSE Key to Health Benefits
A groundbreaking study by researchers at the USC Leonard Davis School of Gerontology suggests that the profound health benefits of the Mediterranean diet may stem, in part, from mitochondrial microproteins, specifically humanin and SHMOOSE. This research offers compelling new insights into how dietary choices can influence aging and disease risk.
The benefits associated with the Mediterranean diet may be partly due to mitochondrial microproteins, specifically humanin and SHMOOSE.
The study, spearheaded by Instructional Associate Professor Roberto Vicinanza, made a significant discovery: individuals adhering closely to a Mediterranean-style diet exhibited elevated levels of humanin and SHMOOSE. Both microproteins have prior associations with protection against cardiovascular disease and neurodegeneration.
Mitochondrial Microproteins and Diet
Professor Vicinanza explained that these microproteins may serve as molecular messengers that translate dietary intake into cellular function and aging processes. The Mediterranean diet, celebrated for its abundance of olive oil, fish, legumes, fruits, and vegetables, has long been linked to a reduced risk of heart disease, diabetes, and cognitive decline. The specific mechanisms underpinning these benefits have been a continuous area of investigation.
Researchers analyzed blood samples from older adults. They observed that those with higher dietary adherence showed significantly increased levels of humanin and SHMOOSE. This was alongside reduced markers of oxidative stress, a known contributor to aging and chronic disease.
Specific dietary components showed correlations: olive oil, fish, and legumes were associated with higher humanin levels, while olive oil and lower intake of refined carbohydrates were linked to higher SHMOOSE levels. USC Distinguished Professor Pinchas Cohen, the study's senior author, highlighted that these findings indicate specific components of the Mediterranean diet may directly impact mitochondrial biology. He also suggested that humanin and SHMOOSE could function as biomarkers for adherence to the diet and hold clinical relevance.
The Role of Humanin and SHMOOSE
This study builds upon over two decades of research into mitochondria-derived peptides. Unlike traditional proteins, these unique microproteins originate from small open reading frames within the mitochondrial genome. Humanin, first identified by Cohen and colleagues in 2003, has been associated with improved insulin sensitivity, cardiovascular protection, longevity, and cognitive function.
More recently, Cohen's lab discovered SHMOOSE, another microprotein connected to brain health. A genetic variant of SHMOOSE has been linked to increased Alzheimer's disease risk, while its normal form appears to protect neurons from amyloid-related damage.
Unpacking the Cardioprotective Mechanisms
The study also pointed to a potential interaction between humanin and Nox2, an enzyme responsible for producing reactive oxygen species. Higher humanin levels corresponded with lower Nox2 activity, suggesting a role for the peptide in reducing oxidative stress and protecting the cardiovascular system.
Researchers hypothesize that the Mediterranean diet may operate through a dual mechanism: directly lowering oxidative stress while also augmenting mitochondrial microproteins that suppress damaging pathways.
Towards Precision Nutrition and Global Advocacy
This observational study paves the way for a new direction in "precision nutrition." In this approach, biomarkers like mitochondrial microproteins could guide tailored dietary recommendations for optimizing individual health and longevity. Future research aims to investigate whether targeted dietary interventions can directly elevate levels of humanin, SHMOOSE, and related peptides, and if these changes correlate with reduced disease risk.
Beyond the scientific realm, Professor Vicinanza has been actively involved in global advocacy for the Mediterranean diet, including efforts to establish the International Day of the Mediterranean Diet at the United Nations, celebrated annually on November 16.