Hormonal
In young subjects with early-onset type 2 diabetes, chronic aerobic exercise fails to activate the PGC-1α/Mfn2 mitochondrial regulatory pathway, resulting in a lack of increase in VO2max and defective mitochondrial biogenesis compared to obese controls.
For young individuals with early-onset type 2 diabetes, standard aerobic exercise may not trigger the usual mitochondrial improvements seen in healthy individuals. This biological resistance means that while exercise is still beneficial for other health markers, it may not improve cardiovascular fitness (VO2max) or insulin sensitivity as expected. This highlights the need for personalized exercise prescriptions or adjunctive therapies to overcome this specific molecular defect.
Our results demonstrate alterations in the regulatory pathway that controls PGC-1α expression and induction of Mfn2 in muscle from patients with early-onset type 2 diabetes. Patients with early-onset type 2 diabetes display abnormalities in the exercise-dependent pathway that regulates the expression of PGC-1α and Mfn2.
Why this rating
Controlled clinical study with muscle biopsies and molecular analysis, though limited by small sample size (n=6-7 per group).
Source
Subjects With Early-Onset Type 2 Diabetes Show Defective Activation of the Skeletal Muscle PGC-1α/Mitofusin-2 Regulatory Pathway in Response to Physical Activity
María Isabel Hernández‐Álvarez et al. · Diabetes Care · 2009
DOI 10.2337/dc09-1305
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