The composition of fiber types within skeletal muscle impacts the tissue's physiological characteristics and susceptibility to disease and ageing. In vitro systems should therefore account for fiber-type composition when modelling muscle conditions. To induce fiber specification in vitro, we designed a quantitative contractility assay based on optogenetics and particle image velocimetry. We submitted cultured myotubes to long-term intermittent light-stimulation patterns and characterized their structural and functional adaptations. After several days of in vitro exercise, myotubes contract faster and are more resistant to fatigue. The enhanced contractile functionality was accompanied by advanced maturation such as increased width and up-regulation of neuron receptor genes. We observed an up-regulation in the expression of fast myosin heavy-chain isoforms, which induced a shift towards a fast-twitch phenotype. This long-term in vitro exercise strategy can be used to study fiber specification and refine muscle disease modelling.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10427763 | PMC |
| http://dx.doi.org/10.26508/lsa.202302227 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
From Fragmented Facts to Unified Knowledge: Exploring Concept Mapping in Neuromuscular Physiology Among First-Year Medical Students.
Cureus
November 2024
Biochemistry, All India Institute of Medical Sciences, Bhubaneswar, IND.
Background First-year medical students may find it challenging to integrate complex physiological concepts, particularly neuromuscular physiology. While concept mapping has shown promise in medical education, its specific application in teaching intricate physiological mechanisms still needs to be explored. With this background, the objective of the study was to assess the feasibility of using concept mapping among first-year medical students and to explore the perception of students about concept mapping as an educational tool.
View Article and Find Full Text PDFImpact of electrical muscle stimulation-induced muscle contractions on endogenous pain modulatory system: a quantitative sensory testing evaluation.
BMC Musculoskelet Disord
December 2024
Faculty of Rehabilitation, Kobe Gakuin University, 518 Arise, Ikawadani-cho, Nishi-ku, Kobe, Hyogo, 651-2180, Japan.
Background: Exercise-induced hypoalgesia (EIH) is characterized by a reduction in pain perception and sensitivity across both exercising and non-exercising body parts during and after a single bout of exercise. EIH is mediated through central and peripheral mechanisms; however, the specific effect of muscle contraction alone on EIH remains unclear. Moreover, previous studies on electrical muscle stimulation (EMS) have primarily focused on local analgesic effects, often relying on subjective pain reports.
View Article and Find Full Text PDFAssociations of blood pressure with white matter hyperintensities later in life; influence of short-term menopausal hormone therapy.
Menopause
January 2025
From the Department of Radiology, Mayo Clinic, Rochester, MN.
Objective: To assess the association of systolic and diastolic blood pressure (SBP and DBP) in recently menopausal women with white matter hyperintensity (WMH) volume later in life and determine whether short-term menopausal hormone therapy (mHT) modifies these associations.
Methods: Kronos Early Estrogen Prevention Study (KEEPS) was a multicenter, randomized, double-blinded, placebo-controlled 4-year mHT trial (oral conjugated equine estrogens or transdermal 17β-estradiol). KEEPS continuation was an observational follow-up of the participants 10 years after the end of mHT.
Piezo1 overexpression in the uterus contributes to myometrium contraction and inflammation-associated preterm birth.
J Transl Med
December 2024
Department of Anesthesiology, West China Second University Hospital, Sichuan University, No. 20, Section 3, South of Renmin Road, Chengdu, 610041, Sichuan, China.
Background: Preterm birth, a leading cause of perinatal mortality and morbidity, is often associated with inflammation and aberrant myometrial contractions. This study investigates the role of Piezo1, a mechanosensitive ion channel, in myometrium contraction and inflammation-associated preterm birth.
Methods: We employed Western blotting, Immunofluorescence, and Quantitative real-time PCR techniques to examine Piezo1 expression in uterine tissues.
Proteomic and metabolomic analyses of the human adult myocardium reveal ventricle-specific regulation in end-stage cardiomyopathies.
Commun Biol
December 2024
Precision Cardiovascular Laboratory, The University of Sydney, Sydney, NSW, Australia.
Article Synopsis
- * A study was conducted using mass spectrometry to analyze the differences in metabolome (metabolism) and proteome (proteins) between healthy left and right ventricles, revealing significant metabolic changes.
- * In advanced heart conditions like dilated and ischemic cardiomyopathy, the distinct metabolic pathways between the ventricles become less pronounced, but the left ventricle shows more adverse changes related to heart failure.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!