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Awasthi S, Izu LT, Mao Z, Jian Z, Landas T, Lerner A, Shimkunas R, Woldeyesus R, Bossuyt J, Wood BM, Chen YJ, Matthews DL, Lieu DK, Chiamvimonvat N, Lam KS, Chen-Izu Y, Chan JW. Multimodal SHG-2PF Imaging of Microdomain Ca2+-Contraction Coupling in Live Cardiac Myocytes. Circ Res 2015; 118:e19-28. [PMID: 26643875 DOI: 10.1161/circresaha.115.307919] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 12/07/2015] [Indexed: 01/24/2023]
Abstract
RATIONALE Cardiac myocyte contraction is caused by Ca(2+) binding to troponin C, which triggers the cross-bridge power stroke and myofilament sliding in sarcomeres. Synchronized Ca(2+) release causes whole cell contraction and is readily observable with current microscopy techniques. However, it is unknown whether localized Ca(2+) release, such as Ca(2+) sparks and waves, can cause local sarcomere contraction. Contemporary imaging methods fall short of measuring microdomain Ca(2+)-contraction coupling in live cardiac myocytes. OBJECTIVE To develop a method for imaging sarcomere level Ca(2+)-contraction coupling in healthy and disease model cardiac myocytes. METHODS AND RESULTS Freshly isolated cardiac myocytes were loaded with the Ca(2+)-indicator fluo-4. A confocal microscope equipped with a femtosecond-pulsed near-infrared laser was used to simultaneously excite second harmonic generation from A-bands of myofibrils and 2-photon fluorescence from fluo-4. Ca(2+) signals and sarcomere strain correlated in space and time with short delays. Furthermore, Ca(2+) sparks and waves caused contractions in subcellular microdomains, revealing a previously underappreciated role for these events in generating subcellular strain during diastole. Ca(2+) activity and sarcomere strain were also imaged in paced cardiac myocytes under mechanical load, revealing spontaneous Ca(2+) waves and correlated local contraction in pressure-overload-induced cardiomyopathy. CONCLUSIONS Multimodal second harmonic generation 2-photon fluorescence microscopy enables the simultaneous observation of Ca(2+) release and mechanical strain at the subsarcomere level in living cardiac myocytes. The method benefits from the label-free nature of second harmonic generation, which allows A-bands to be imaged independently of T-tubule morphology and simultaneously with Ca(2+) indicators. Second harmonic generation 2-photon fluorescence imaging is widely applicable to the study of Ca(2+)-contraction coupling and mechanochemotransduction in both health and disease.
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Affiliation(s)
- Samir Awasthi
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Leighton T Izu
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Ziliang Mao
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Zhong Jian
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Trevor Landas
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Aaron Lerner
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Rafael Shimkunas
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Rahwa Woldeyesus
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Julie Bossuyt
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Brent M Wood
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Yi-Je Chen
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Dennis L Matthews
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Deborah K Lieu
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Nipavan Chiamvimonvat
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Kit S Lam
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis
| | - Ye Chen-Izu
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis.
| | - James W Chan
- From the Center for Biophotonics (S.A., Z.M., A.L., D.L.M., J.W.C.), Division of Cardiology (D.K.L., N.C., Y.C.-I.), Division of Hematology/Oncology, Department of Internal Medicine (K.S.L.), and Department of Pathology and Laboratory Medicine (J.W.C.), UC Davis School of Medicine, University of California, Davis, Sacramento; and Departments of Pharmacology (L.T.I., Z.J., T.L., J.B., B.W., Y.-J.C., Y.C.-I.), Biomedical Engineering (S.A., R.S., R.W., Y.C.-I.), Biochemistry and Molecular Medicine (K.S.L.), and Microsurgery Core (Y.-J.C.), University of California, Davis.
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