力信号对心肌细胞跳动的调控

陈惠燕; 李洛非; 王炜; 曹毅; 雷海

doi:10.7498/aps.73.20240095

摘要

心肌细胞的机械行为对生命健康起至关重要的作用, 通常认为电信号和化学信号对心肌细胞的行为起调控作用. 近年来发现细胞微环境的物理因素能够调控细胞的增殖、铺展、迁移和分化等行为, 但其对心肌细胞机械行为的调控研究仍然缺乏. 本文制备具有不同杨氏模量的水凝胶以模拟心肌细胞力学微环境, 并通过加载力学刺激来探究细胞外基质中不同配体对心肌细胞的力学调控. 研究表明机械力信号可以通过基质-配体-细胞的信号通路来调控心肌细胞的跳动, 进而引起细胞间的耦合振荡实现心肌细胞的节律控制. 这种力信号调控受细胞微环境的杨氏模量、细胞黏附配体种类和密度、以及力信号的强弱和节律三者共同影响, 这为理解心率失调和心肌梗死后心力衰竭等疾病提供基础.

关键词:

Abstract

The mechanical behavior of cardiomyocytes plays an essential role in maintaining life and health. It is traditionally believed that both electrical signals and chemical signals modulate the cardiomyocytes behaviors. Recent discoveries have elucidated that the physical cues of microenvironment can regulate cell activities such as proliferation, spreading, migration, and differentiation. However, there is still limited research on regulating cardiomyocytes beating through mechanical force. Herein we prepare different polyacrylamide gels coated with different cell adhesion ligand proteins to simulate the physical microenvironment of cardiomyocytes. Then the mechanical loading forces are loaded by using a tungsten probe to stretch elastic hydrogels which can emulate the mechanical oscillations induced by the beating of adjacent cardiomyocytes. We investigate the responsive behavior of cardiomyocytes to external mechanical oscillations within various physical microenvironments. Firstly, we load 1 Hz mechanical oscillation on the matrix (E = 11 kPa) with different kinds and concentrations of ligands (0, 5, 20, 100 μg/mL) to stimulate cardiomyocytes and observe their mechanical response behavior. Our findings indicate that all kinds of ligands including Laminin, Fibronectin and Collagen I , can mediate the cardiomyocytes response to extrinsic mechanical oscillatory stimuli, which might be due to distinct mechanisms of mechanical force coupling (Fig. (b)). This suggests that mechanical force signals can regulate the beating of cardiomyocytes through matrix-ligand-cell signaling pathway, thereby inducing intercellular coupled oscillations for rhythmic control of cardiomyocytes. Cardiomyocytes cultured on the matrix coated with 20 μg/mL Laminin show the highest and most stable response fraction. We hypothesize that there exist dual force transduction pathways for Laminin binding to integrin and dystrophin glycoprotein complex (DGC) (Fig. (a)). We further analyze the cardiomyocytes behaviors under mechanical oscillation with different values of substrate stiffness (E = 1.8, 11, 27 kPa) and concentrations of Laminin (0, 5, 20, 100 μg/mL). We find that cardiomyocytes cultured on 1.8 kPa coated with 20 μg/mL Laminin show the highest response fraction (Fig. (c)). Our results demonstrate that the stiffness of substrate, the type and density of cell adhesion ligands, as well as the strength and rhythm of the mechanical signals can synergetically affect the cardiomyocytes responses to external mechanical stimulations, which provides the foundation for understanding the diseases such as cardiac arrhythmias and heart failure following myocardial infarction.

Keywords:

作者及机构信息

1.
南京大学物理学院, 固体微结构国家实验室, 南京　210093

2.
浙江大学物理学院, 杭州　310027

3.
浙江大学物理高等研究院, 杭州　310027

通信作者: 曹毅, caoyi@nju.edu.cn ; 雷海, leihai@zju.edu.cn

基金项目: 国家自然科学基金(批准号: T2222019, T2225016, 11934008)资助的课题.

Authors and contacts

1.
National Laboratory of Solid State Microstructure, School of Physics, Nanjing University, Nanjing 210093, China

2.
School of Physics, Zhejiang University, Hangzhou 310027, China

3.
Institute for Advanced Study in Physics, Zhejiang University, Hangzhou 310027, China

Corresponding author: Cao Yi, caoyi@nju.edu.cn ; Lei Hai, leihai@zju.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. T2222019, T2225016, 11934008).

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[2]	World Health Organization 2023. Licence: CC BY-NC-SA 3.0 IGO
[3]	Thayer J F, Yamamoto S S, Brosschot J F 2010 Int. J. Cardiol. 141 122 Google Scholar
[4]	Quinn T A, Kohl P 2021 Physiol. Rev. 101 37 Google Scholar
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[43]	Chen-Izu Y, Izu L T 2017 J. Physiol. 595 3949 Google Scholar
[44]	Roca-Cusachs P, Gauthier N C, del Rio A, Sheetz M P 2009 Proc. Natl. Acad. Sci. U. S. A. 106 16245 Google Scholar
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施引文献

图 1 力学刺激加载平台示意图

Fig. 1. Diagram of mechanical loading platform.

下载: 全尺寸图片幻灯片

图 2 聚丙烯酰胺水凝胶的制备与表征　(a) 聚丙烯酰胺水凝胶的制备示意图; (b)—(d) 基于AFM的3种不同水凝胶的杨氏模量分布, 其杨氏模量分别为(1.824 ± 0.111) kPa, (11.688 ± 0.493) kPa和(27.358 ± 2.331) kPa; (e)—(g)对应3种水凝胶的SEM结果

Fig. 2. Preparation and characterization of PA gel: (a) Schematic illustration of the preparation of PA gel; (b)–(d) the Young’ modulus distributions of three different of PA gel measured by AFM, which are (1.824 ± 0.111) kPa, (11.688 ± 0.493) kPa, and (27.358 ± 2.331) kPa, respectively; (e)–(g) SEM images of three different of PA gel.

下载: 全尺寸图片幻灯片

图 3 力学刺激加载及荧光表征 (a), (b)分别为对单个心肌细胞施加力学刺激前后的实物图; (c) 钨针运动到最大振幅时, PA gel上各点的位移分布图(单位为 μm); (d) 心肌细胞机械行为检测, 红色虚线为钨针输出的力振荡信号, 黑色实线是心肌细胞达到同频后Fluo4探针检测到的Ca²⁺ 振荡信号

Fig. 3. Mechanical loading and fluorescence characterization: (a), (b) Phase-contrast images of individual cardiomyocyte before and after mechanical stimulation; (c) displacement distribution of each point on PA gel when the tungsten probe moves to the maximum amplitude (unit: μm); (d) mechanical behavior detection of cardiomyocytes, the red dotted line is the signal of mechanical oscillation output by tungsten probe, and the black solid line is the Ca²⁺ oscillation signal detected by Fluo4 probe after cardiomyocytes reach the same frequency with the tungsten probe.

下载: 全尺寸图片幻灯片

图 4 心肌细胞在不同种类及浓度配体的基质(E = 11 kPa)上发生机械响应行为　(a) 心肌细胞机械响应百分比(n > 31); (b) 心肌细胞产生响应所需的机械刺激时间 (n > 7); (c)心肌细胞与钨针同频所需的机械刺激时间 (n > 5); (d) 心肌细胞同频持续时长(n > 5); (e) 3种不同配体( Laminin / Fibronectin / Collagen I ) 分别与心肌细胞膜受体结合示意图

Fig. 4. Mechanical response behavior of cardiomyocytes on the matrix (E = 11 kPa) with different kinds and concentrations of ligands: (a) The fraction of mechanical response of cardiomyocytes (n > 31); (b) the mechanical stimulation time required for cardiomyocytes to respond the stimulation (n > 7); (c) the mechanical stimulation time required for cardiomyocytes to couple with the tungsten probe (n > 5); (d) duration of cardiomyocyte coupling with tungsten probe (n > 5); (e) schematics of three different ligands (Laminin/Fibronectin/Collagen I) binding to myocardial cell membrane receptors.

下载: 全尺寸图片幻灯片

图 5 心肌细胞在不同Laminin浓度和基质硬度上的机械响应行为　(a) 心肌细胞机械响应百分比 (n > 23); (b) 心肌细胞产生响应所需的机械刺激时间 (n > 8); (c) 心肌细胞与钨针同频所需的机械刺激时间 (n > 5); (d)心肌细胞同频持续时长 (n > 5)

Fig. 5. Mechanical response behavior of cardiomyocytes at different Laminin concentrations and matrix stiffness: (a) The fraction of mechanical response of cardiomyocytes (n > 23); (b) The mechanical stimulation time required for cardiomyocytes to respond the stimulation (n > 8); (c)The mechanical stimulation time required for cardiomyocytes to couple with the tungsten probe (n > 5); (d) Duration of cardiomyocytes coupling with tungsten probe (n > 5).

下载: 全尺寸图片幻灯片

下载: 全尺寸图片幻灯片

[1]	Dogan A, Parmaksız M, Elçin A E, Elçin Y M 2016 Stem Cell Rev. Rep. 12 202 Google Scholar
[2]	World Health Organization 2023. Licence: CC BY-NC-SA 3.0 IGO
[3]	Thayer J F, Yamamoto S S, Brosschot J F 2010 Int. J. Cardiol. 141 122 Google Scholar
[4]	Quinn T A, Kohl P 2021 Physiol. Rev. 101 37 Google Scholar
[5]	De Mello WC 1982 Circ. Res. 51 1 Google Scholar
[6]	McCain M L, Lee H, Aratyn-Schaus Y, Kléber A G, Parker K K 2012 Proc. Natl. Acad. Sci. U.S.A. 109 9881 Google Scholar
[7]	Kumar N M, Gilula N B 1996 Cell 84 381 Google Scholar
[8]	Barr L, Dewey M M, Berger W 1965 J. Gen. Physiol. 48 797 Google Scholar
[9]	Corrado D, Basso C, Thiene G, et al. 1997 J. Am. Coll. Cardiol. 30 1512 Google Scholar
[10]	Pelham R J, Wang Y L 1997 Proc. Natl. Acad. Sci. U.S.A. 94 13661 Google Scholar
[11]	Harris A 1973 Exp. Cell Res. 77 285 Google Scholar
[12]	Folkman J, Moscona A 1978 Nature 273 345 Google Scholar
[13]	Wang W Y, Davidson C D, Lin D, Baker B M 2019 Nat. Commun. 10 1186 Google Scholar
[14]	Isomursu A, Park K Y, Hou J, et al. 2022 Nat. Mater. 21 1081 Google Scholar
[15]	Adebowale K, Gong Z, Hou J C, Wisdom K M, Garbett D, Lee H P, Nam S, Meyer T, Odde D J, Shenoy V B, Chaudhuri O 2021 Nat. Mater. 20 1290 Google Scholar
[16]	Bera K, Kiepas A, Godet I, Li Y, Mehta P, Ifemembi B, Paul C D, Sen A, Serra S A, Stoletov K, Tao J, Shatkin G, Lee S J, Zhang Y, Boen A, Mistriotis P, Gilkes D M, Lewis J D, Fan C M, Feinberg A P, Valverde M A, Sun S X, Konstantopoulos K 2022 Nature 611 365 Google Scholar
[17]	王璟, 杨根, 刘峰 2015 物理学报 64 058707 Google Scholar Wang J, Yang G, Liu F 2015 Acta Phys. Sin. 64 058707 Google Scholar
[18]	Lecuit T, Le Goff L 2007 Nature 450 189 Google Scholar
[19]	Assoian R K, Klein E A 2008 Trends Cell Biol. 18 347 Google Scholar
[20]	Wen J H, Vincent L G, Fuhrmann A, Choi Y S, Hribar K C, Taylor-Weiner H, Chen S, Engler A J 2014 Nat. Mater. 13 979 Google Scholar
[21]	Engler A J, Sen S, Sweeney H L, Discher D E 2006 Cell 126 677 Google Scholar
[22]	Zhang J S, Wong S H D, Wu X, Lei H, Qin M, Shi P, Wang W, Bian L, Cao Y 2021 Adv. Mater. 33 2105765 Google Scholar
[23]	Chowdhury F, Na S, Li D, Poh Y C, Tanaka T S, Wang F, Wang N 2010 Nat. Mater. 9 82 Google Scholar
[24]	Ingber D E, Folkman J 1989 J. Cell Biol. 109 317 Google Scholar
[25]	Reinhart-King C A, Dembo M, Hammer D A 2008 Biophys. J. 95 6044 Google Scholar
[26]	Tang X, Bajaj P, Bashir R, Saif T A 2011 Soft Matter 7 6151 Google Scholar
[27]	Nitsan I, Drori S, Lewis Y E, Cohen S, Tzlil S 2016 Nature Phys. 12 472 Google Scholar
[28]	Cohen O, Safran S A 2018 Sci. Rep. 8 2237 Google Scholar
[29]	Bick R J, Snuggs M B, Poindexter B J, Buja L M, Winkle W B V 1998 Cell Adhes. Commun. 6 301 Google Scholar
[30]	Engler A J, Carag-Krieger C, Johnson C P, Raab M, Tang H Y, Speicher D W, Sanger J W, Sanger J M, Discher D E 2008 J. Cell Sci. 121 3794 Google Scholar
[31]	Majkut S, Idema T, Swift J, Krieger C, Liu A, Discher D E 2013 Curr. Biol. 23 2434 Google Scholar
[32]	Jacot J G, McCulloch A D, Omens J H 2008 Biophys. J. 95 3479 Google Scholar
[33]	Ehler E, Moore-Morris T, Lange S 2013 J. Vis. Exp. e50154
[34]	Gittenberger-de Groot A C, Vrancken Peeters M P F M, Mentink M M T, Gourdie R G, Poelmann R E 1998 Circ. Res. 82 1043 Google Scholar
[35]	Berry M F, Engler A J, Woo Y J, Pirolli T J, Bish L T, Jayasankar V, Morine K J, Gardner T J, Discher D E, Sweeney H L 2006 Am. J. Physiol. Heart Circ. Physiol. 290 H2196 Google Scholar
[36]	Eisner D A, Choi H S, Díaz M E, O'Neill S C, Trafford A W 2000 Circ. Res. 87 1087 Google Scholar
[37]	Bers D M 2002 Nature 415 198 Google Scholar
[38]	白永强, 唐爱辉, 王世强, 朱星 2007 物理学报 56 3607 Google Scholar Bai Y Q, Tang A H, Wang S Q, Zhu X 2007 Acta Phys. Sin. 56 3607 Google Scholar
[39]	Ross R S, Borg T K 2001 Circ. Res. 88 1112 Google Scholar
[40]	Israeli-Rosenberg S, Manso A M, Okada H, Ross R S 2014 Circ. Res. 114 572 Google Scholar
[41]	Tan P M, Buchholz K S, Omens J H, McCulloch A D, Saucerman J J 2017 PLOS Comput. Biol. 13 e1005854 Google Scholar
[42]	Harvey P A, Leinwand L A 2011 J. of Cell Biol. 194 355 Google Scholar
[43]	Chen-Izu Y, Izu L T 2017 J. Physiol. 595 3949 Google Scholar
[44]	Roca-Cusachs P, Gauthier N C, del Rio A, Sheetz M P 2009 Proc. Natl. Acad. Sci. U. S. A. 106 16245 Google Scholar
[45]	Kechagia J Z, Ivaska J, Roca-Cusachs P 2019 Nat. Rev. Mol. Cell Biol. 20 457 Google Scholar
[46]	Sun Z, Guo S S, Fässler R 2016 J. Cell Biol. 215 445 Google Scholar
[47]	Han Y L, Ronceray P, Xu G, Malandrino A, Kamm R D, Lenz M, Broedersz C P, Guo M 2018 Proc. Natl. Acad. Sci. U. S. A. 115 4075 Google Scholar
[48]	Hall M S, Alisafaei F, Ban E, Feng X, Hui C Y, Shenoy V B, Wu M 2016 Proc. Natl. Acad. Sci. U. S. A. 113 14043 Google Scholar
[49]	孙波 2015 物理学报 64 058201 Google Scholar Sun B 2015 Acta Phys. Sin. 64 058201 Google Scholar
[50]	Hu J Y, Li J H, Jiang J, Wang L L, Roth J, McGuinness K N, Baum J, Dai W, Sun Y, Nanda V, Xu F 2022 Nat. Commun. 13 6761 Google Scholar
[51]	Discher D E, Janmey P, Wang Y L 2005 Science 310 1139 Google Scholar
[52]	Hersch N, Wolters B, Dreissen G, Springer R, Kirchgeßner N, Merkel R, Hoffmann B 2013 Biol. Open 2 351 Google Scholar

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