C2C12

Morphology

Wild-type C2C12 cells have a radial branching morphology consisting of long fibers extending in many directions. C2C12 cells can be cultured in a variety of conditions to induce specific responses of interest. For example, assisted by the cell line's high differentiation rate and fusion rate, fibronectin templates can be micro-plated to petri dishes or cell culture flasks in order to induce specific growth patterns, such as that of skeletal muscle cell interactions with extracellular matrix components. The introduction of adhesion molecules can alter the growth pattern of C2C12 cells to a longitudinal distribution exhibiting polarity. There are many ways to regulate the shape of C2C12 myoblasts genetically and environmentally, from stress, to cytoskeleton alteration, to growth factors. The scaffolding of C2C12 cells is particularly important for studying muscle tissue regeneration post-injury or after tissue wasting due to disease or ICU rehabilitation.

Uses in research

C2C12 cells have been shown to effectively incorporate exogenous cDNA and nucleic acids by transfection. In the piloting research originally conducted by Yaffe and Saxel, C2C12 were obtained through serial passage of myoblasts cultured from the thigh muscle of C3H mice after crush injury. In their study, a set of C2C12 cells were cultured from normal mouse myoblasts, which were cultured from two-month-old C3H mice after crush injury. Within two days, the normal cells differentiated into spindle-shaped mononucleated myoblasts. After four days, multinucleated myotube networks formed, and a few days after, sarcomeres and Z-lines could be observed. In contrast, the dystrophic cells formed shortened fibers covered in fibroblasts, a hallmark of muscle wasting.

C2C12 cells demonstrate rapid development and maturation into functional skeletal muscle cells or cardiac muscle cells, having the ability to contract and generate force. The rate of muscle formation from C2C12 cells can be controlled by the introduction of loss-of-functions genes vital for the fusion of myoblasts and myogenesis. Under necrotic conditions, such as tumor necrosis factor alpha (TNF-α), direct protein loss, particularly myosin heavy chain protein, in C2C12 skeletal muscle cells has been shown. C2C12 cells were used to elucidate inactivated X chromosome (Xi) replication during early S-phase of the cell cycle and is regulated epigenetically. C2C12 cells are especially convenient for studying the cell cycle due to its high division rate.

Most laboratories today use the C2C12 subclone developed by Helen Blau from the original cell line by Yaffe and Saxel. These cells are immortalized, which means that they proliferate indefinitely due to a genetic mutation. The mutation that causes this in C2C12 skeletal muscle cells is believed to be in the INK4a gene (CDKN2A).

Electrical pulse stimulation

Electrical pulse stimulation (EPS) is an in vitro method used to mimic muscle contraction in cultured cells, enabling the study of exercise‐related adaptations such as changes in metabolism, mitochondrial function, and gene expression. In C2C12 myotubes, EPS can be applied to investigate processes like glucose uptake, insulin sensitivity, and muscle fatigue. A systematic review of 54 published studies found that the most commonly used settings include a voltage of 10–20 V, pulse duration of 2 ms, a frequency of 1 Hz, and stimulation periods of around 24 hours. The exact protocol should be determined based on the goal of the experiment.

References

References

1. (1977-12-22). "Serial passaging and differentiation of myogenic cells isolated from dystrophic mouse muscle". Nature.
2. "C2C12 Cell Line".
3. (2012-02-04). "Working with the C2C12 cell line". Research in Myogenesis.
4. (2011-09-01). "Patterning the differentiation of C2C12 skeletal myoblasts". Integrative Biology.
5. Mermelstein, C. S.. (May 5, 2003). "Changes in cell shape, cytoskeletal proteins and adhesion sites of cultured cells after extracellular Ca2+ chelation". Brazilian Journal of Medical and Biological Research.
6. (1994-06-01). "C2C12 cells: biophysical, biochemical, and immunocytochemical properties". American Journal of Physiology. Cell Physiology.
7. (2017-04-21). "Control of muscle formation by the fusogenic micropeptide myomixer". Science.
8. (1998-07-01). "Skeletal muscle myocytes undergo protein loss and reactive oxygen-mediated NF-kappaB activation in response to tumor necrosis factor alpha". FASEB Journal.
9. (2011-03-01). "Histone acetylation controls the inactive X chromosome replication dynamics". Nature Communications.
10. "C2C12 - CRL-1772 {{!}} ATCC".
11. (2024-04-01). "Bleomycin-treated myoblasts undergo p21-associated cellular senescence and have severely impaired differentiation". GeroScience.
12. Pajcini, Kostandin V.. (2010-08-06). "Transient Inactivation of Rb and ARF Yields Regenerative Cells from Postmitotic Mammalian Muscle". Cell Stem Cell.
13. van de Meene, Mark.. (2025-08-08). "In vitro muscle contraction: A technical review on electrical pulse stimulation in C2C12 cells". Experimental Physiology.