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Physiological and functional characterization for high-throughput optogenetic skeletal muscle exercise assays [30min]

ABSTRACT: Physiological and functional characterization for high-throughput optogenetic skeletal muscle exercise assays [30min]

PROVIDER: PRJNA1312499 | ENA |

REPOSITORIES: ENA

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Physiological and functional characterization for high-throughput optogenetic skeletal muscle exercise assays

Project description:Physiological and functional characterization for high-throughput optogenetic skeletal muscle exercise assays

| PRJNA1312619 | ENA

Physiological and functional characterization for high-throughput optogenetic skeletal muscle exercise assays [60min]

Project description:Physiological and functional characterization for high-throughput optogenetic skeletal muscle exercise assays [60min]

| PRJNA1312685 | ENA

Physiological and functional characterization for high-throughput optogenetic skeletal muscle exercise assays [60min]

Project description:Exercise has long been considered an essential part of human health and longevity. Recent physiological studies have expanded muscle’s role beyond simply acting as an actuator, revealing muscle’s exercise-mediated paracrine and endocrine relationships with other organ systems. In vitro engineered skeletal muscle models can address physiological questions about exercise adaptation with the precision of cell biology. Optogenetic tools have enabled a noninvasive approach to stimulating muscle contraction that avoids the potential off-target effects of electrical stimulation techniques. In this article we propose high-throughput culture and optical exercise protocols to generate statistically robust cellular exercise response datasets. We characterize optical rheobase for 2D muscle tissue morphology, finding that optical intensities as low as 5 μW mm-2 can trigger contraction. We then analyze bulk RNA sequencing data collected from high throughput, acute exercise protocols and find a rich display of transcriptional behavior that is consistent with experimental observations. The spontaneous contractility of our tissue constructs introduced oxygen diffusion challenges when maintained in a 24 well plate, and our analysis shows divergent myogenic and pathological transcriptional consequences of hypoxia. We believe our techniques provide a practical foundation for conducting future high-precision in vitro exercise studies of skeletal muscle.

2025-08-29 | GSE306857 | GEO

Physiological and functional characterization for high-throughput optogenetic skeletal muscle exercise assays [30min]

2025-08-29 | GSE306842 | GEO

Physiological and functional characterization for high-throughput optogenetic skeletal muscle exercise assays

Project description:This SuperSeries is composed of the SubSeries listed below.

2025-08-29 | GSE306860 | GEO

Sensing Cardiac Electrical Activity with a Cardiomyocyte Targeted Optogenetic Voltage Indicator

Project description:Rationale: Monitoring and controlling cardiomyocyte activity with optogenetic tools offers exciting possibilities for fundamental and translational cardiovascular research. Genetically encoded voltage indicators may be particularly attractive for minimal invasive and repeated assessments of cardiac excitation from the cellular to the whole heart level. Objective: To test the hypothesis that cardiomyocyte-targeted voltage-sensitive fluorescence protein 2.3 (VSFP2.3) can be exploited as optogenetic tool for the monitoring of electrical activity in isolated cardiomyocytes and the whole heart as well as function and maturity in induced pluripotent stem cell (iPSC)-derived cardiomyocytes. Methods and Results: We first generated mice with cardiomyocyte-restricted expression of VSFP2.3 and demonstrated distinct sarcolemmal localization of VSFP2.3 without any signs for associated pathologies (assessed by echocardiography). Optically recorded VSFP2.3 signals correlated well with membrane voltage measured simultaneously by patch-clamping. The utility of VSFP2.3 for human action potential recordings was confirmed by simulation of immature and mature action potentials in murine VSFP2.3 cardiomyocytes. Optical cardiograms (OCGs) could be monitored in whole hearts ex vivo and minimally invasively in vivo via fiber optics at physiological heart rate (10 Hz) and under pacing-induced arrhythmia. Finally, we reprogrammed tail-tip fibroblasts from transgenic mice and used the VSFP2.3 sensor for benchmarking functional and structural maturation in iPSC-derived cardiomyocytes. Conclusions: We introduce a novel transgenic voltage-sensor model as a new method in cardiovascular research and provide proof-of-concept for its utility in optogenetic sensing of physiological and pathological excitation in mature and immature cardiomyocytes in vitro and in vivo. Determination of transgene (VSFP2.3) cardiotoxicity

2015-09-02 | E-GEOD-69190 | biostudies-arrayexpress

Discovering human diabetes-risk gene function with genetics and physiological assays

Project description:Discovering human diabetes-risk gene function with genetics and physiological assays

| PRJNA478311 | ENA

Antihypertrophic Memory after Regression of Exercise-induced Physiological Myocardial Hypertrophy

Project description:Antihypertrophic Memory after Regression of Exercise-induced Physiological Myocardial Hypertrophy

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Physiological and molecular dissection of daily variance in exercise capacity

Project description:Physiological and molecular dissection of daily variance in exercise capacity

| PRJNA481324 | ENA

Physiological and molecular dissection of daily variance in exercise capacity

Project description:Physical performance relies on the concerted action of myriad responses, many of which are under circadian clock control. Little is known, however, regarding the time-dependent effect on exercise performance at the molecular level. We found that both mice and humans exhibit day-time variance in exercise capacity between the early and late part of their active phase. The day-time variance in mice was dependent on exercise intensity and relied on the circadian clock proteins PER1/2. High throughput gene expression and metabolic profiling of skeletal muscle revealed metabolic pathways that are differently activated upon exercise in a day-time dependent manner. Remarkably, we discovered that ZMP, an endogenous AMPK activator, is induced by exercise in a time-dependent manner to regulate key steps in glycolytic and fatty acid oxidation pathways and potentially enhance exercise capacity. Overall, we propose that time of the day is a major modifier of exercise capacity and associated metabolic pathways.

2019-04-07 | GSE117161 | GEO

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