BUFFALO, NY — November 11, 2025 — A new #research paper was #published in Volume 17, Issue 10 of Aging-US on October 1, 2025, titled “L-β-aminoisobutyric acid (L-BAIBA) in combination with voluntary wheel running exercise enhances musculoskeletal properties in middle-age male mice.”
In this study led by first author Julian A. Vallejo and corresponding author Michael J. Wacker from the University of Missouri, Kansas City, researchers investigated how L-β-aminoisobutyric acid (L-BAIBA), a natural compound released during exercise, works together with regular physical activity to improve muscle and bone health in middle-aged male mice. The findings may support new strategies to maintain musculoskeletal health in aging populations, especially those at risk for mobility loss or osteoporosis.
Muscle and bone strength naturally decline with age, increasing the risk of falls, fractures, and reduced quality of life. While exercise remains the most effective way to counteract this deterioration, it is often difficult for older individuals to maintain sufficient activity levels to see results. L-BAIBA, a molecule naturally produced during physical activity, is known to promote energy metabolism and support muscle and bone cells. This study explored its potential to work in synergy with endurance exercise to maximize health benefits in aging bodies.
Researchers studied 12-month-old male mice that were split into different groups. Some remained sedentary, while others exercised freely on running wheels. Half of each group received daily L-BAIBA supplementation. After three months, the mice that received both the supplement and exercise showed greater improvements than those receiving either one alone. The soleus, a slow-twitch muscle essential for endurance and balance, grew larger and stronger only in the combined treatment group. These muscles also shifted to a more fatigue-resistant fiber type and had a larger number of oxidative fibers.
“To investigate this hypothesis, we subjected 12-month-old (as a model of middle-age) male C57BL6 mice to voluntary wheel running (VWR) with L-BAIBA (100mg/kg/day) (VWR+L-BAIBA), VWR alone, L-BAIBA alone, or none (CTRL) for three months.”
The study also showed significant improvements in bone health. Mice that received both exercise and L-BAIBA developed thicker and denser trabecular bone, along with reduced fat levels in the bone marrow, indicators of stronger, healthier bones. These changes were not observed in the groups that only exercised or only received L-BAIBA. Although the compound caused minor changes in heart electrical activity, it did not affect heart size or overall function, suggesting it is safe in this setting.
These findings suggest that L-BAIBA may enhance the benefits of physical activity by supporting muscle strength and bone structure, particularly in slow-twitch muscle fibers. This combination could serve as a therapeutic strategy to help older adults, including those unable to engage in regular exercise, maintain musculoskeletal health.
As the aging population grows, there is a growing need for solutions that support muscle and bone health without requiring strenuous activity. This research highlights the potential of natural, exercise-related molecules like L-BAIBA to help maintain mobility and strength throughout aging.
DOI - https://doi.org/10.18632/aging.206325
Corresponding author - Michael J. Wacker — wackerm@umkc.edu
Abstract video - https://www.youtube.com/watch?v=A-zfrLUikfQ
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BUFFALO, NY — November 11, 2025 — A new #research paper was #published in Volume 17, Issue 10 of Aging-US on October 1, 2025, titled “L-β-aminoisobutyric acid (L-BAIBA) in combination with voluntary wheel running exercise enhances musculoskeletal properties in middle-age male mice.”
In this study led by first author Julian A. Vallejo and corresponding author Michael J. Wacker from the University of Missouri, Kansas City, researchers investigated how L-β-aminoisobutyric acid (L-BAIBA), a natural compound released during exercise, works together with regular physical activity to improve muscle and bone health in middle-aged male mice. The findings may support new strategies to maintain musculoskeletal health in aging populations, especially those at risk for mobility loss or osteoporosis.
Muscle and bone strength naturally decline with age, increasing the risk of falls, fractures, and reduced quality of life. While exercise remains the most effective way to counteract this deterioration, it is often difficult for older individuals to maintain sufficient activity levels to see results. L-BAIBA, a molecule naturally produced during physical activity, is known to promote energy metabolism and support muscle and bone cells. This study explored its potential to work in synergy with endurance exercise to maximize health benefits in aging bodies.
Researchers studied 12-month-old male mice that were split into different groups. Some remained sedentary, while others exercised freely on running wheels. Half of each group received daily L-BAIBA supplementation. After three months, the mice that received both the supplement and exercise showed greater improvements than those receiving either one alone. The soleus, a slow-twitch muscle essential for endurance and balance, grew larger and stronger only in the combined treatment group. These muscles also shifted to a more fatigue-resistant fiber type and had a larger number of oxidative fibers.
“To investigate this hypothesis, we subjected 12-month-old (as a model of middle-age) male C57BL6 mice to voluntary wheel running (VWR) with L-BAIBA (100mg/kg/day) (VWR+L-BAIBA), VWR alone, L-BAIBA alone, or none (CTRL) for three months.”
The study also showed significant improvements in bone health. Mice that received both exercise and L-BAIBA developed thicker and denser trabecular bone, along with reduced fat levels in the bone marrow, indicators of stronger, healthier bones. These changes were not observed in the groups that only exercised or only received L-BAIBA. Although the compound caused minor changes in heart electrical activity, it did not affect heart size or overall function, suggesting it is safe in this setting.
These findings suggest that L-BAIBA may enhance the benefits of physical activity by supporting muscle strength and bone structure, particularly in slow-twitch muscle fibers. This combination could serve as a therapeutic strategy to help older adults, including those unable to engage in regular exercise, maintain musculoskeletal health.
As the aging population grows, there is a growing need for solutions that support muscle and bone health without requiring strenuous activity. This research highlights the potential of natural, exercise-related molecules like L-BAIBA to help maintain mobility and strength throughout aging.
DOI - https://doi.org/10.18632/aging.206325
Corresponding author - Michael J. Wacker — wackerm@umkc.edu
Abstract video - https://www.youtube.com/watch?v=A-zfrLUikfQ
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PAI-1 Deficiency Protects Aging Female Mice from Muscle and Bone Loss
Aging-US
3 minutes 56 seconds
2 weeks ago
PAI-1 Deficiency Protects Aging Female Mice from Muscle and Bone Loss
BUFFALO, NY — October 23, 2025 — A new #research paper was #published in Volume 17, Issue 9 of Aging-US on September 11, 2025, titled “Roles of plasminogen activator inhibitor-1 in aging-related muscle and bone loss in mice.”
In this study led by first author Takashi Ohira and corresponding author Hiroshi Kaji from Kindai University Faculty of Medicine, researchers found that female mice lacking the gene for plasminogen activator inhibitor-1 (PAI-1) were protected from age-related muscle weakness and bone thinning. This suggests that PAI-1 could be a potential target for future treatments to reduce frailty in aging populations.
As the global population continues to age, more people are affected by conditions such as sarcopenia and osteoporosis. These disorders involve the progressive loss of skeletal muscle mass and bone density, leading to reduced mobility, a greater risk of falls, and a lower quality of life.
To investigate the role of PAI-1 in aging, researchers compared young (6-month-old) and aged (24-month-old) male and female mice, with and without the PAI-1 gene. They found that PAI-1 levels increased with age in both sexes. However, only female mice lacking the PAI-1 gene experienced a significant reduction in age-related muscle and bone loss.
Female mice without PAI-1 maintained stronger grip strength and greater muscle mass in their lower limbs. They also showed less cortical bone loss in their femurs and tibias. In contrast, male mice did not experience the same benefits, despite also showing increased levels of PAI-1 with age. These results suggest that PAI-1 contributes to aging-related decline in a sex-specific manner.
“The present study found that lower limb muscle mass, gastrocnemius and soleus muscle tissue weights, and grip strength were significantly lower in 24-month-old male and female wild-type mice than in their 6-month-old counterparts.”
PAI-1 plays key roles in blood clotting, inflammation, and cellular senescence—a process in which aging cells release harmful molecules that affect nearby tissues. One of these molecules, interleukin-6 (IL-6), is a major driver of inflammation. The researchers found that aged female mice lacking PAI-1 had lower IL-6 levels in both muscle and blood, suggesting that PAI-1 may contribute to muscle and bone loss by promoting inflammation. These protective effects were also not associated with changes in muscle protein turnover or reductions in fibrous tissue, reinforcing the idea that PAI-1’s impact is likely driven by inflammatory signaling.
This study highlights PAI-1 as a promising therapeutic target for slowing or preventing age-related declines in muscle and bone health, particularly in women. Since postmenopausal women are especially vulnerable to osteoporosis and frailty, a better understanding of how PAI-1 contributes to aging could lead to new strategies for maintaining strength and mobility in later life. Further research is needed to explore how PAI-1 interacts with other age-related biological changes and why its effects differ between sexes.
DOI - https://doi.org/10.18632/aging.206318
Corresponding author - Hiroshi Kaji - hkaji@med.kindai.ac.jp
Abstract video - https://www.youtube.com/watch?v=hg4qKf-oO2I
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Aging-US
BUFFALO, NY — November 11, 2025 — A new #research paper was #published in Volume 17, Issue 10 of Aging-US on October 1, 2025, titled “L-β-aminoisobutyric acid (L-BAIBA) in combination with voluntary wheel running exercise enhances musculoskeletal properties in middle-age male mice.”
In this study led by first author Julian A. Vallejo and corresponding author Michael J. Wacker from the University of Missouri, Kansas City, researchers investigated how L-β-aminoisobutyric acid (L-BAIBA), a natural compound released during exercise, works together with regular physical activity to improve muscle and bone health in middle-aged male mice. The findings may support new strategies to maintain musculoskeletal health in aging populations, especially those at risk for mobility loss or osteoporosis.
Muscle and bone strength naturally decline with age, increasing the risk of falls, fractures, and reduced quality of life. While exercise remains the most effective way to counteract this deterioration, it is often difficult for older individuals to maintain sufficient activity levels to see results. L-BAIBA, a molecule naturally produced during physical activity, is known to promote energy metabolism and support muscle and bone cells. This study explored its potential to work in synergy with endurance exercise to maximize health benefits in aging bodies.
Researchers studied 12-month-old male mice that were split into different groups. Some remained sedentary, while others exercised freely on running wheels. Half of each group received daily L-BAIBA supplementation. After three months, the mice that received both the supplement and exercise showed greater improvements than those receiving either one alone. The soleus, a slow-twitch muscle essential for endurance and balance, grew larger and stronger only in the combined treatment group. These muscles also shifted to a more fatigue-resistant fiber type and had a larger number of oxidative fibers.
“To investigate this hypothesis, we subjected 12-month-old (as a model of middle-age) male C57BL6 mice to voluntary wheel running (VWR) with L-BAIBA (100mg/kg/day) (VWR+L-BAIBA), VWR alone, L-BAIBA alone, or none (CTRL) for three months.”
The study also showed significant improvements in bone health. Mice that received both exercise and L-BAIBA developed thicker and denser trabecular bone, along with reduced fat levels in the bone marrow, indicators of stronger, healthier bones. These changes were not observed in the groups that only exercised or only received L-BAIBA. Although the compound caused minor changes in heart electrical activity, it did not affect heart size or overall function, suggesting it is safe in this setting.
These findings suggest that L-BAIBA may enhance the benefits of physical activity by supporting muscle strength and bone structure, particularly in slow-twitch muscle fibers. This combination could serve as a therapeutic strategy to help older adults, including those unable to engage in regular exercise, maintain musculoskeletal health.
As the aging population grows, there is a growing need for solutions that support muscle and bone health without requiring strenuous activity. This research highlights the potential of natural, exercise-related molecules like L-BAIBA to help maintain mobility and strength throughout aging.
DOI - https://doi.org/10.18632/aging.206325
Corresponding author - Michael J. Wacker — wackerm@umkc.edu
Abstract video - https://www.youtube.com/watch?v=A-zfrLUikfQ
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