Abstract
Cardiac myocytes are known to be influenced by the rigidity and topography of their physical microenvironment. It was hypothesized that 3D heterogeneity introduced by purely physical microdomains regulates cardiac myocyte size and contraction. This was tested in vitro using polymeric microstructures (G′ = 1.66 GPa) suspended with random orientation in 3D by a soft Matrigel matrix (G′ = 22.9 Pa). After 10 days of culture, the presence of 100 μm-long microstructures in 3D gels induced fold increases in neonatal rat ventricular myocyte size (1.61 ± 0.06, p < 0.01) and total protein/cell ratios (1.43 ± 0.08, p < 0.05) that were comparable to those induced chemically by 50 μM phenylephrine treatment. Upon attachment to microstructures, individual myocytes also had larger cross-sectional areas (1.57 ± 0.05, p < 0.01) and higher average rates of spontaneous contraction (2.01 ± 0.08, p < 0.01) than unattached myocytes. Furthermore, the inclusion of microstructures in myocyte-seeded gels caused significant increases in the expression of beta-1 adrenergic receptor (β1-AR, 1.19 ± 0.01), cardiac ankyrin repeat protein (CARP, 1.26 ± 0.02), and sarcoplasmic reticulum calcium-ATPase (SERCA2, 1.59 ± 0.12, p < 0.05), genes implicated in hypertrophy and contractile activity. Together, the results demonstrate that cardiac myocyte behavior can be controlled through local 3D microdomains alone. This approach of defining physical cues as independent features may help to advance the elemental design considerations for scaffolds in cardiac tissue engineering and therapeutic microdevices.
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Abbreviations
- 3D:
-
three dimensions
- AraC:
-
cytosine β-D-arabino-furanoside
- β1-AR:
-
beta-1 adrenergic receptor
- β2M:
-
beta-2 microglobulin
- BDM:
-
2,3-butanedione monoxime
- BPM:
-
beats per minute
- BSA:
-
bovine serum albumin
- CARP:
-
cardiac ankyrin repeat protein
- COX8H:
-
cytochrome c oxidase subunit VIII heart/muscle
- DAPI:
-
4′,6-diamidino-2-phenylindole
- DIC:
-
differential interference contrast
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- DOB:
-
dobutamine
- ECM:
-
extracellular matrix
- PBS:
-
phosphate buffered saline
- PE:
-
phenylephrine
- PEGDMA:
-
poly(ethylene glycol) dimethacrylate
- SDS:
-
sodium dodecyl sulfate
- SEM:
-
standard error of measurement
- SERCA2:
-
sarcoplasmic reticulum calcium-ATPase
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Acknowledgements
Many thanks to Perla Ayala at the University of California at San Francisco for her ongoing help in fabricating microstructures. This work was supported by the National Institutes of Health grants T32 HL007692, PO1 HL62426, and RO1 HL090523.
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Curtis, M.W., Sharma, S., Desai, T.A. et al. Hypertrophy, gene expression, and beating of neonatal cardiac myocytes are affected by microdomain heterogeneity in 3D. Biomed Microdevices 12, 1073–1085 (2010). https://doi.org/10.1007/s10544-010-9461-y
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DOI: https://doi.org/10.1007/s10544-010-9461-y