{"id":1439,"date":"2024-12-09T08:15:54","date_gmt":"2024-12-09T08:15:54","guid":{"rendered":"https:\/\/stage.website4md.com\/molecular-matrix\/?p=1439"},"modified":"2025-07-01T11:10:28","modified_gmt":"2025-07-01T11:10:28","slug":"cellular-conversations-biological-signals-in-orthopedic-tissue-repair-2","status":"publish","type":"post","link":"https:\/\/stage.website4md.com\/molecular-matrix\/cellular-conversations-biological-signals-in-orthopedic-tissue-repair-2\/","title":{"rendered":"Cellular Conversations: Biological Signals in Orthopedic Tissue Repair"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1439\" class=\"elementor elementor-1439\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c920929 e-flex e-con-boxed wpr-particle-no wpr-jarallax-no wpr-parallax-no wpr-sticky-section-no e-con e-parent\" data-id=\"c920929\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-97810ba e-con-full e-flex wpr-particle-no wpr-jarallax-no wpr-parallax-no wpr-sticky-section-no e-con e-child\" data-id=\"97810ba\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-99554eb elementor-widget elementor-widget-text-editor\" data-id=\"99554eb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<strong>Part 2: Mechanical Signals<\/strong>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d0a04f4 elementor-widget elementor-widget-text-editor\" data-id=\"d0a04f4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tImagine our cells communicating like a vast network of people. While we use words, cells \u201ctalk\u201d through biochemical, mechanical, and electrical signals. At Molecular Matrix, Inc., we\u2019re\u00a0dedicated to unraveling these cellular conversations to improve regenerative therapies. In this series, we explore key biological signals involved in orthopedic tissue repair. In Part 1, we covered biochemical signals crucial for bone repair. Now, in Part 2, we dive into the role of mechanical signals and how they guide bone healing.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d734207 elementor-widget elementor-widget-text-editor\" data-id=\"d734207\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<strong><em>Mechanical Signals: How Physical Forces Stimulate Bone Healing<\/em><\/strong>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-580b191 elementor-widget elementor-widget-text-editor\" data-id=\"580b191\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tOur bones endure continuous\u00a0stress, from simple\u00a0movements to intense physical activities. Over a century ago, Wolff\u2019s Law\u00a0described how bones\u00a0adapt to the level\u00a0of mechanical load: increased load strengthens bone, while lack of load leads to weakening. This concept underlies recovery strategies post-injury, injury prevention, and management of conditions such as osteoporosis\u00a0through regular resistance training or weight-bearing exercises.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1fa35ae elementor-widget elementor-widget-text-editor\" data-id=\"1fa35ae\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<strong><em>How Cells Sense and Respond to Mechanical Stimuli<\/em><\/strong>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4224dca elementor-widget elementor-widget-image\" data-id=\"4224dca\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"562\" height=\"751\" src=\"https:\/\/stage.website4md.com\/molecular-matrix\/wp-content\/uploads\/2025\/06\/b8b111_88deb6a0a1364f07ae2c807463a5bbb8mv2-1.png\" class=\"attachment-large size-large wp-image-1441\" alt=\"\" srcset=\"https:\/\/stage.website4md.com\/molecular-matrix\/wp-content\/uploads\/2025\/06\/b8b111_88deb6a0a1364f07ae2c807463a5bbb8mv2-1.png 562w, https:\/\/stage.website4md.com\/molecular-matrix\/wp-content\/uploads\/2025\/06\/b8b111_88deb6a0a1364f07ae2c807463a5bbb8mv2-1-225x300.png 225w\" sizes=\"(max-width: 562px) 100vw, 562px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-281c23c elementor-widget elementor-widget-text-editor\" data-id=\"281c23c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tCells interpret\u00a0mechanical signals\u00a0through a process called\u00a0<strong><em>mechanotransduction<\/em><\/strong>, where physical forces transform stimuli into biochemical cues\u00a0that drive\u00a0bone remodeling.\u00a0Various cellular receptors and molecules help convert these forces into signals that promote growth, repair, or adaptation in response to stress. (Robling et al., 2006)\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a00450f elementor-widget elementor-widget-text-editor\" data-id=\"a00450f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tHere is a closer look at the types of bone cells involved in responding to these signals:\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4ff1b9f elementor-widget elementor-widget-text-editor\" data-id=\"4ff1b9f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul class=\"ggbv- _6XZJW\"><li class=\"_8T5i3\" dir=\"auto\" aria-level=\"1\"><p id=\"viewer-7m3m8110\" class=\"_04qQG jtShe _3GmD8 UGHSE\" dir=\"\"><span class=\"mVzZr _3GmD8\"><strong><em>Osteocytes:<\/em><\/strong>\u00a0These mature bone cells are nestled\u00a0in the mineralized matrix, connected by channels that sense fluid shifts during movement. Changes in fluid shear stress prompt osteocytes to signal other cells to either build bone when under load stress or increase bone resorption\u00a0when unstressed. (Qin et al., 2020; Xu et al., 2021)\u00a0<\/span><\/p><\/li><li class=\"_8T5i3\" dir=\"auto\" aria-level=\"1\"><p id=\"viewer-ky6q9114\" class=\"_04qQG jtShe _3GmD8 UGHSE\" dir=\"\"><span class=\"mVzZr _3GmD8\"><strong><em>Mesenchymal Stem Cells (MSCs): <\/em><\/strong>Fluid shear stress encourages MSCs to differentiate into osteoblasts and suppresses the formation of osteoclasts.\u00a0\u00a0(Datta et al., 2006; Henstock et al., 2024)\u00a0<\/span><\/p><\/li><li class=\"_8T5i3\" dir=\"auto\" aria-level=\"1\"><p id=\"viewer-l0vig118\" class=\"_04qQG jtShe _3GmD8 UGHSE\" dir=\"\"><span class=\"mVzZr _3GmD8\"><strong><em>Osteoclasts:<\/em><\/strong>\u00a0These bone-resorbing cells have ion channels sensitive to fluid stress that regulate their activity, morphology, and gene expression. (Bratengeier\u00a0et al., 2020)\u00a0<\/span><\/p><\/li><li class=\"_8T5i3\" dir=\"auto\" aria-level=\"1\"><p id=\"viewer-9f06t122\" class=\"_04qQG jtShe _3GmD8 UGHSE\" dir=\"\"><span class=\"mVzZr _3GmD8\"><strong><em>Osteoblasts:<\/em><\/strong>\u00a0These bone-building cells respond to physical load by producing proteins and growth factors that promote bone matrix formation and stabilization at injury sites. (Knapik et al., 2014)\u00a0<\/span><\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8dc8ea7 elementor-widget elementor-widget-text-editor\" data-id=\"8dc8ea7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<strong><em>The Extracellular Matrix (ECM) and Mechanotransduction<\/em><\/strong>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5069553 elementor-widget elementor-widget-text-editor\" data-id=\"5069553\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tAll the important cellular players in bone physiology are influenced by the mechanical properties of the three-dimensional environment in which they reside. This \u2018niche\u2019 consists of ECM components together with the cells they surround and connect. The ECM itself is composed of proteins like collagen, fibronectin, elastin, laminin, glycosaminoglycan, and glycoproteins. The specific composition of the ECM is dynamic with changes in density, rigidity and orientation occurring in response to the extracellular environment. This, in turn, may induce reorganization of cytoskeletal protein and trigger changes in downstream molecular signaling pathways. As examples: \t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0c31345 elementor-widget elementor-widget-text-editor\" data-id=\"0c31345\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul class=\"ggbv- _6XZJW\">\n \t<li class=\"_8T5i3\" dir=\"auto\" aria-level=\"1\">\n<p id=\"viewer-zwalf132\" class=\"_04qQG jtShe _3GmD8 UGHSE\" dir=\"\"><span class=\"mVzZr _3GmD8\">MSC differentiation can be switched from adipogenesis to osteogenesis by changing ECM stiffness.\u00a0\u00a0<\/span><\/p>\n<\/li>\n \t<li class=\"_8T5i3\" dir=\"auto\" aria-level=\"1\">\n<p id=\"viewer-1p84q135\" class=\"_04qQG jtShe _3GmD8 UGHSE\" dir=\"\"><span class=\"mVzZr _3GmD8\">Osteoblast maturation increases on firm\u00a0ECM while soft\u00a0ECM appears to favor\u00a0osteoclast maturation.<\/span><\/p>\n<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0703c31 elementor-widget elementor-widget-text-editor\" data-id=\"0703c31\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<strong><em>Mechanosensitive Cell Structures<\/em><\/strong>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-be441d7 elementor-widget elementor-widget-text-editor\" data-id=\"be441d7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul class=\"ggbv- _6XZJW\">\n \t<li class=\"_8T5i3\" dir=\"auto\" aria-level=\"1\">\n<p id=\"viewer-85qhq142\" class=\"_04qQG jtShe _3GmD8 UGHSE\" dir=\"\"><span class=\"mVzZr _3GmD8\"><strong><em>Focal adhesions:<\/em><\/strong>\u00a0These large macromolecular protein complexes can contain\u00a0over 100 different proteins and have roles in cell migration. Integrins are a crucial transmembrane component\u00a0of focal adhesions. These heterodimeric receptors functionally link the ECM to the cytoskeleton, providing a means to transfer mechanical stimuli from the extracellular environment to intracellular signaling\u00a0or cytoskeletal\u00a0proteins.\u00a0\u00a0<\/span><\/p>\n<\/li>\n \t<li class=\"_8T5i3\" dir=\"auto\" aria-level=\"1\">\n<p id=\"viewer-p3q86146\" class=\"_04qQG jtShe _3GmD8 UGHSE\" dir=\"\"><span class=\"mVzZr _3GmD8\"><strong><em>Primary Cilium:<\/em><\/strong>\u00a0Mechanical signals such as fluid shear stress are detected by cilium and transmitted via the hedgehog signaling pathway. In bone, this signals osteoprogenitors to differentiate into bone-forming osteoblasts\u00a0at certain frequencies.\u00a0\u00a0\u00a0<\/span><\/p>\n<\/li>\n \t<li class=\"_8T5i3\" dir=\"auto\" aria-level=\"1\">\n<p id=\"viewer-ovfbi150\" class=\"_04qQG jtShe _3GmD8 UGHSE\" dir=\"\"><span class=\"mVzZr _3GmD8\"><strong><em>G\u00a0protein-coupled\u00a0receptors:<\/em><\/strong>\u00a0These receptors,\u00a0located\u00a0on the cell membrane,\u00a0sense mechanical stimuli\u00a0and transduce the signal via the Rho-Rock and PLC-IP3 signaling pathways.\u00a0(Kalinkovich\u00a0&amp; Livshits, 2018)\u00a0<\/span><\/p>\n<\/li>\n \t<li class=\"_8T5i3\" dir=\"auto\" aria-level=\"1\">\n<p id=\"viewer-cwfmi154\" class=\"_04qQG jtShe _3GmD8 UGHSE\" dir=\"\"><span class=\"mVzZr _3GmD8\"><strong><em>Stretch-Activated Ion channels:<\/em><\/strong>\u00a0Ion flow, especially calcium influx, modulates downstream signaling.\u00a0(Martino et al., 2018)\u00a0\u00a0<\/span><\/p>\n<\/li>\n \t<li class=\"_8T5i3\" dir=\"auto\" aria-level=\"1\">\n<p id=\"viewer-dfs0j158\" class=\"_04qQG jtShe _3GmD8 UGHSE\" dir=\"\"><span class=\"mVzZr _3GmD8\"><strong><em>Cytoskeleton:<\/em><\/strong>\u00a0Within the cell is a dynamic network of interlinking protein filaments and tubules known as the cytoskeleton. In addition to providing for cell shape, organization of organelles and cell movement, the cytoskeleton provides a pathway for mechanical forces to be transferred from the plasma membrane to internal cellular structures. (Maniotis\u00a0et al., 1997)\u00a0<\/span><\/p>\n<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a86284f elementor-widget elementor-widget-text-editor\" data-id=\"a86284f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<strong><em>Enhancing Bone Healing Through Controlled Mechanical Load<\/em><\/strong>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-703e8c8 elementor-widget elementor-widget-text-editor\" data-id=\"703e8c8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div data-breakout=\"normal\">\n<p id=\"viewer-ljgxq164\" class=\"_04qQG jtShe _3GmD8 UGHSE\" dir=\"auto\"><span class=\"mVzZr _3GmD8\">Controlled physical load during rehabilitation can stimulate bone healing by strengthening the initial callus and promoting complete remodeling. Advanced biomaterials and implants are being developed to mimic mechanical cues, helping guide cell behavior and optimize healing.\u00a0\u00a0(Hart et al., 2017)\u00a0<\/span><\/p>\n\n<\/div>\n<div data-breakout=\"normal\">\n<p id=\"viewer-nep8i166\" class=\"_04qQG jtShe _3GmD8 UGHSE\" dir=\"auto\"><span class=\"mVzZr _3GmD8\">Mechanical signals are a crucial component\u00a0of the body\u2019s repair toolkit. Understanding and leveraging\u00a0these forces could enable us to better harness the healing potential of orthopedic tissues. At Molecular Matrix, Inc., our bone graft substitute Osteo-P\u00ae BGS models the natural bone extracellular matrix, providing substrate and mechanical cues for repair with the patient\u2019s own cells. Through these cellular conversations, we\u2019re\u00a0developing new possibilities in regenerative medicine that are both innovative and aligned with the body\u2019s intrinsic healing abilities.\u00a0<\/span><\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-abdb8a7 elementor-widget elementor-widget-text-editor\" data-id=\"abdb8a7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<strong>References:<\/strong>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fcf55c7 elementor-widget elementor-widget-text-editor\" data-id=\"fcf55c7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div data-breakout=\"normal\"><p id=\"viewer-ekbz3173\" class=\"_04qQG jtShe wGvE1 UGHSE\" dir=\"auto\"><span class=\"mVzZr\">Bratengeier, C., Liszka, A., Hoffman, J., Bakker, A. D., &amp; Fahlgren, A. (2020). High shear stress amplitude in combination with prolonged stimulus duration determine\u00a0induction of osteoclast formation by hematopoietic progenitor cells. FASEB journal :\u00a0official publication of the Federation of American Societies for Experimental Biology, 34(3), 3755\u20133772. <a class=\"WAzZp aiPD3\" href=\"https:\/\/doi.org\/10.1096\/fj.201901458R\" target=\"_blank\" rel=\"noopener\" data-hook=\"web-link\"><u>https:\/\/doi.org\/10.1096\/fj.201901458R<\/u><\/a>\u00a0<\/span><\/p><\/div><div data-breakout=\"normal\"><p id=\"viewer-kloqd177\" class=\"_04qQG jtShe wGvE1 UGHSE\" dir=\"auto\"><span class=\"mVzZr\">Datta, N., Pham, Q. P., Sharma, U., Sikavitsas, V. I., Jansen, J. A., &amp; Mikos, A. G. (2006). In vitro generated\u00a0extracellular matrix and fluid shear stress synergistically enhance 3D osteoblastic differentiation.\u202f<em>Proceedings of the National Academy of Sciences of the United States of America<\/em>,\u202f<em>103<\/em>(8), 2488\u20132493. <a class=\"WAzZp aiPD3\" href=\"https:\/\/doi.org\/10.1073\/pnas.0505661103\" target=\"_blank\" rel=\"noopener\" data-hook=\"web-link\"><u>https:\/\/doi.org\/10.1073\/pnas.0505661103<\/u><\/a><a class=\"WAzZp aiPD3\" href=\"https:\/\/doi.org\/10.1073\/pnas.0505661103\" target=\"_blank\" rel=\"noopener\" data-hook=\"web-link\"><u>\u00a0<\/u><\/a><\/span><\/p><\/div><div data-breakout=\"normal\"><p id=\"viewer-sxlvk185\" class=\"_04qQG jtShe wGvE1 UGHSE\" dir=\"auto\"><span class=\"mVzZr\">Hart NH, Nimphius S, Rantalainen T, Ireland A, Siafarikas A, Newton RU. Mechanical basis of bone strength: influence of bone material, bone structure and muscle action. J Musculoskelet Neuronal Interact. 2017 Sep 1;17(3):114-139. PMID: 28860414; PMCID: PMC5601257.\u00a0<\/span><\/p><\/div><div data-breakout=\"normal\"><p id=\"viewer-g03h5188\" class=\"_04qQG jtShe wGvE1 UGHSE\" dir=\"auto\"><span class=\"mVzZr\">Henstock, J. R., Price, J. C. F. A., &amp; El Haj, A. J. (2024). Determining\u00a0Which Hydrostatic Pressure Regimes Promote Osteogenesis\u00a0in Human Mesenchymal Stem Cells. Tissue engineering and regenerative medicine, 10.1007\/s13770-024-00666-w. Advance online publication. <a class=\"WAzZp aiPD3\" href=\"https:\/\/doi.org\/10.1007\/s13770-024-00666-w\" target=\"_blank\" rel=\"noopener\" data-hook=\"web-link\"><u>https:\/\/doi.org\/10.1007\/s13770-024-00666-w<\/u><\/a><a class=\"WAzZp aiPD3\" href=\"https:\/\/doi.org\/10.1007\/s13770-024-00666-w\" target=\"_blank\" rel=\"noopener\" data-hook=\"web-link\"><u>\u00a0<\/u><\/a><\/span><\/p><\/div><div data-breakout=\"normal\"><p id=\"viewer-h5bu0192\" class=\"_04qQG jtShe wGvE1 UGHSE\" dir=\"auto\"><span class=\"mVzZr\">Kalinkovich, A., &amp; Livshits, G. (2021). Biased and allosteric modulation of bone cell-expressing G protein-coupled receptors as a novel approach to osteoporosis therapy.\u202f<em>Pharmacological research<\/em>,\u202f<em>171<\/em>, 105794. <a class=\"WAzZp aiPD3\" href=\"https:\/\/doi.org\/10.1016\/j.phrs.2021.105794\" target=\"_blank\" rel=\"noopener\" data-hook=\"web-link\"><u>https:\/\/doi.org\/10.1016\/j.phrs.2021.105794<\/u><\/a><a class=\"WAzZp aiPD3\" href=\"https:\/\/doi.org\/10.1016\/j.phrs.2021.105794\" target=\"_blank\" rel=\"noopener\" data-hook=\"web-link\"><u>\u00a0<\/u><\/a><\/span><\/p><\/div><div data-breakout=\"normal\"><p id=\"viewer-kvsa6200\" class=\"_04qQG jtShe wGvE1 UGHSE\" dir=\"auto\"><span class=\"mVzZr\">Knapik, D. M., Perera, P., Nam, J., Blazek, A. D., Rath, B., Leblebicioglu, B., Das, H., Wu, L. C., Hewett, T. E., Agarwal, S. K., Jr, Robling, A. G., Flanigan, D. C., Lee, B. S., &amp; Agarwal, S. (2014). Mechanosignaling\u00a0in bone health, trauma\u00a0and inflammation.\u202f<em>Antioxidants &amp; redox signaling<\/em>,\u202f<em>20<\/em>(6), 970\u2013985. <a class=\"WAzZp aiPD3\" href=\"https:\/\/doi.org\/10.1089\/ars.2013.5467\" target=\"_blank\" rel=\"noopener\" data-hook=\"web-link\"><u>https:\/\/doi.org\/10.1089\/ars.2013.5467\u00a0<\/u><\/a><\/span><\/p><\/div><div data-breakout=\"normal\"><p id=\"viewer-5b8pb208\" class=\"_04qQG jtShe wGvE1 UGHSE\" dir=\"auto\"><span class=\"mVzZr\">Maniotis, A. J., Chen, C. S., &amp; Ingber, D. E. (1997). Demonstration of mechanical connections between integrins, cytoskeletal filaments, and nucleoplasm that stabilize nuclear\u2009structure. <em>Proceedings of the National Academy of Sciences of the United States of America<\/em>, <em>94<\/em>(3), 849. <a class=\"WAzZp aiPD3\" href=\"https:\/\/doi.org\/10.1073\/pnas.94.3.849\" target=\"_blank\" rel=\"noopener\" data-hook=\"web-link\"><u>https:\/\/doi.org\/10.1073\/pnas.94.3.849\u00a0<\/u><\/a><\/span><\/p><\/div><div data-breakout=\"normal\"><p id=\"viewer-unfqp216\" class=\"_04qQG jtShe wGvE1 UGHSE\" dir=\"auto\"><span class=\"mVzZr\">Martino, F., Perestrelo, A. R., Vinarsk\u00fd, V., Pagliari, S., &amp; Forte, G. (2018). Cellular Mechanotransduction: From Tension to Function. <em>Frontiers in Physiology<\/em>, <em>9<\/em>, 378185. <a class=\"WAzZp aiPD3\" href=\"https:\/\/doi.org\/10.3389\/fphys.2018.00824\" target=\"_blank\" rel=\"noopener\" data-hook=\"web-link\"><u>https:\/\/doi.org\/10.3389\/fphys.2018.00824\u00a0<\/u><\/a><\/span><\/p><\/div><div data-breakout=\"normal\"><p id=\"viewer-4vkjl224\" class=\"_04qQG jtShe wGvE1 UGHSE\" dir=\"auto\"><span class=\"mVzZr\">Qin, L., Liu, W., Cao, H.\u202f<em>et al.<\/em>\u202fMolecular mechanosensors\u00a0in osteocytes.\u202f<em>Bone Res<\/em>\u202f<strong>8<\/strong>, 23 (2020). <a class=\"WAzZp aiPD3\" href=\"https:\/\/doi.org\/10.1038\/s41413-020-0099-y\" target=\"_blank\" rel=\"noopener\" data-hook=\"web-link\"><u>https:\/\/doi.org\/10.1038\/s41413-020-0099-y<\/u><\/a>\u00a0<\/span><\/p><\/div><div data-breakout=\"normal\"><p id=\"viewer-vbo0k236\" class=\"_04qQG jtShe wGvE1 UGHSE\" dir=\"auto\"><span class=\"mVzZr\">Robling, A. G., Castillo, A. B., &amp; Turner, C. H. (2006). Biomechanical and molecular regulation of bone remodeling.\u202f<em>Annual review of biomedical engineering<\/em>,\u202f<em>8<\/em>, 455\u2013498. <a class=\"WAzZp aiPD3\" href=\"https:\/\/doi.org\/10.1146\/annurev.bioeng.8.061505.095721\" target=\"_blank\" rel=\"noopener\" data-hook=\"web-link\"><u>https:\/\/doi.org\/10.1146\/annurev.bioeng.8.061505.095721<\/u><\/a>\u00a0<\/span><\/p><\/div><div data-breakout=\"normal\"><p id=\"viewer-6iypv246\" class=\"_04qQG jtShe wGvE1 UGHSE\" dir=\"auto\"><span class=\"mVzZr\">Xu X,\u00a0Liu S, Liu H, Ru K, Jia Y, Wu Z, Liang S, Khan Z, Chen Z, Qian A, Hu L. Piezo Channels: Awesome Mechanosensitive Structures in Cellular Mechanotransduction\u00a0and Their Role in Bone. Int J Mol Sci. 2021 Jun 16;22(12):6429. <a class=\"WAzZp aiPD3\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/34208464\/\" target=\"_blank\" rel=\"noopener noreferrer\" data-hook=\"web-link\"><u>doi: 10.3390\/ijms22126429<\/u><\/a>. PMID: 34208464; PMCID: PMC8234635.\u00a0<\/span><\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Part 2: Mechanical SignalsImagine our cells communicating like a vast network of people. While we use words, cells \u201ctalk\u201d through biochemical, mechanical, and electrical signals. At Molecular Matrix, Inc., we\u2019re\u00a0dedicated to unraveling these cellular conversations to improve regenerative therapies. In this series, we explore key biological signals involved in orthopedic tissue repair. In Part 1, we covered biochemical signals crucial for bone repair. Now, in Part 2, we dive into the role of mechanical signals and how they guide bone healing.Mechanical Signals: How Physical Forces Stimulate Bone HealingOur bones endure continuous\u00a0stress, from simple\u00a0movements to intense physical activities. Over a century ago, Wolff\u2019s Law\u00a0described how bones\u00a0adapt to the level\u00a0of mechanical load: increased load strengthens bone, while lack of load leads to weakening. This concept underlies recovery strategies post-injury, injury prevention, and management of conditions such as osteoporosis\u00a0through regular resistance training or weight-bearing exercises.How Cells Sense and Respond to Mechanical Stimuli Cells interpret\u00a0mechanical signals\u00a0through a process called\u00a0mechanotransduction, where physical forces transform stimuli into biochemical cues\u00a0that drive\u00a0bone remodeling.\u00a0Various cellular receptors and molecules help convert these forces into signals that promote growth, repair, or adaptation in response to stress. (Robling et al., 2006)Here is a closer look at the types of bone cells involved in responding to these signals: Osteocytes:\u00a0These mature bone cells are nestled\u00a0in the mineralized matrix, connected by channels that sense fluid shifts during movement. Changes in fluid shear stress prompt osteocytes to signal other cells to either build bone when under load stress or increase bone resorption\u00a0when unstressed. (Qin et al., 2020; Xu et al., 2021)\u00a0 Mesenchymal Stem Cells (MSCs): Fluid shear stress encourages MSCs to differentiate into osteoblasts and suppresses the formation of osteoclasts.\u00a0\u00a0(Datta et al., 2006; Henstock et al., 2024)\u00a0 Osteoclasts:\u00a0These bone-resorbing cells have ion channels sensitive to fluid stress that regulate their activity, morphology, and gene expression. (Bratengeier\u00a0et al., 2020)\u00a0 Osteoblasts:\u00a0These bone-building cells respond to physical load by producing proteins and growth factors that promote bone matrix formation and stabilization at injury sites. (Knapik et al., 2014)\u00a0 The Extracellular Matrix (ECM) and MechanotransductionAll the important cellular players in bone physiology are influenced by the mechanical properties of the three-dimensional environment in which they reside. This \u2018niche\u2019 consists of ECM components together with the cells they surround and connect. The ECM itself is composed of proteins like collagen, fibronectin, elastin, laminin, glycosaminoglycan, and glycoproteins. The specific composition of the ECM is dynamic with changes in density, rigidity and orientation occurring in response to the extracellular environment. This, in turn, may induce reorganization of cytoskeletal protein and trigger changes in downstream molecular signaling pathways. As examples: MSC differentiation can be switched from adipogenesis to osteogenesis by changing ECM stiffness.\u00a0\u00a0 Osteoblast maturation increases on firm\u00a0ECM while soft\u00a0ECM appears to favor\u00a0osteoclast maturation. Mechanosensitive Cell Structures Focal adhesions:\u00a0These large macromolecular protein complexes can contain\u00a0over 100 different proteins and have roles in cell migration. Integrins are a crucial transmembrane component\u00a0of focal adhesions. These heterodimeric receptors functionally link the ECM to the cytoskeleton, providing a means to transfer mechanical stimuli from the extracellular environment to intracellular signaling\u00a0or cytoskeletal\u00a0proteins.\u00a0\u00a0 Primary Cilium:\u00a0Mechanical signals such as fluid shear stress are detected by cilium and transmitted via the hedgehog signaling pathway. In bone, this signals osteoprogenitors to differentiate into bone-forming osteoblasts\u00a0at certain frequencies.\u00a0\u00a0\u00a0 G\u00a0protein-coupled\u00a0receptors:\u00a0These receptors,\u00a0located\u00a0on the cell membrane,\u00a0sense mechanical stimuli\u00a0and transduce the signal via the Rho-Rock and PLC-IP3 signaling pathways.\u00a0(Kalinkovich\u00a0&amp; Livshits, 2018)\u00a0 Stretch-Activated Ion channels:\u00a0Ion flow, especially calcium influx, modulates downstream signaling.\u00a0(Martino et al., 2018)\u00a0\u00a0 Cytoskeleton:\u00a0Within the cell is a dynamic network of interlinking protein filaments and tubules known as the cytoskeleton. In addition to providing for cell shape, organization of organelles and cell movement, the cytoskeleton provides a pathway for mechanical forces to be transferred from the plasma membrane to internal cellular structures. (Maniotis\u00a0et al., 1997)\u00a0 Enhancing Bone Healing Through Controlled Mechanical Load Controlled physical load during rehabilitation can stimulate bone healing by strengthening the initial callus and promoting complete remodeling. Advanced biomaterials and implants are being developed to mimic mechanical cues, helping guide cell behavior and optimize healing.\u00a0\u00a0(Hart et al., 2017)\u00a0 Mechanical signals are a crucial component\u00a0of the body\u2019s repair toolkit. Understanding and leveraging\u00a0these forces could enable us to better harness the healing potential of orthopedic tissues. At Molecular Matrix, Inc., our bone graft substitute Osteo-P\u00ae BGS models the natural bone extracellular matrix, providing substrate and mechanical cues for repair with the patient\u2019s own cells. Through these cellular conversations, we\u2019re\u00a0developing new possibilities in regenerative medicine that are both innovative and aligned with the body\u2019s intrinsic healing abilities.\u00a0 References: Bratengeier, C., Liszka, A., Hoffman, J., Bakker, A. D., &amp; Fahlgren, A. (2020). High shear stress amplitude in combination with prolonged stimulus duration determine\u00a0induction of osteoclast formation by hematopoietic progenitor cells. FASEB journal :\u00a0official publication of the Federation of American Societies for Experimental Biology, 34(3), 3755\u20133772. https:\/\/doi.org\/10.1096\/fj.201901458R\u00a0 Datta, N., Pham, Q. P., Sharma, U., Sikavitsas, V. I., Jansen, J. A., &amp; Mikos, A. G. (2006). In vitro generated\u00a0extracellular matrix and fluid shear stress synergistically enhance 3D osteoblastic differentiation.\u202fProceedings of the National Academy of Sciences of the United States of America,\u202f103(8), 2488\u20132493. https:\/\/doi.org\/10.1073\/pnas.0505661103\u00a0 Hart NH, Nimphius S, Rantalainen T, Ireland A, Siafarikas A, Newton RU. Mechanical basis of bone strength: influence of bone material, bone structure and muscle action. J Musculoskelet Neuronal Interact. 2017 Sep 1;17(3):114-139. PMID: 28860414; PMCID: PMC5601257.\u00a0 Henstock, J. R., Price, J. C. F. A., &amp; El Haj, A. J. (2024). Determining\u00a0Which Hydrostatic Pressure Regimes Promote Osteogenesis\u00a0in Human Mesenchymal Stem Cells. Tissue engineering and regenerative medicine, 10.1007\/s13770-024-00666-w. Advance online publication. https:\/\/doi.org\/10.1007\/s13770-024-00666-w\u00a0 Kalinkovich, A., &amp; Livshits, G. (2021). Biased and allosteric modulation of bone cell-expressing G protein-coupled receptors as a novel approach to osteoporosis therapy.\u202fPharmacological research,\u202f171, 105794. https:\/\/doi.org\/10.1016\/j.phrs.2021.105794\u00a0 Knapik, D. M., Perera, P., Nam, J., Blazek, A. D., Rath, B., Leblebicioglu, B., Das, H., Wu, L. C., Hewett, T. E., Agarwal, S. K., Jr, Robling, A. G., Flanigan, D. C., Lee, B. S., &amp; Agarwal, S. (2014). Mechanosignaling\u00a0in bone health, trauma\u00a0and inflammation.\u202fAntioxidants &amp; redox signaling,\u202f20(6), 970\u2013985. https:\/\/doi.org\/10.1089\/ars.2013.5467\u00a0 Maniotis, A. J., Chen, C. S., &amp; Ingber, D. E. (1997). Demonstration of mechanical connections between integrins, cytoskeletal filaments, and<\/p>\n","protected":false},"author":1,"featured_media":1440,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1439","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/stage.website4md.com\/molecular-matrix\/wp-json\/wp\/v2\/posts\/1439","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stage.website4md.com\/molecular-matrix\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stage.website4md.com\/molecular-matrix\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stage.website4md.com\/molecular-matrix\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stage.website4md.com\/molecular-matrix\/wp-json\/wp\/v2\/comments?post=1439"}],"version-history":[{"count":7,"href":"https:\/\/stage.website4md.com\/molecular-matrix\/wp-json\/wp\/v2\/posts\/1439\/revisions"}],"predecessor-version":[{"id":1448,"href":"https:\/\/stage.website4md.com\/molecular-matrix\/wp-json\/wp\/v2\/posts\/1439\/revisions\/1448"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/stage.website4md.com\/molecular-matrix\/wp-json\/wp\/v2\/media\/1440"}],"wp:attachment":[{"href":"https:\/\/stage.website4md.com\/molecular-matrix\/wp-json\/wp\/v2\/media?parent=1439"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stage.website4md.com\/molecular-matrix\/wp-json\/wp\/v2\/categories?post=1439"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stage.website4md.com\/molecular-matrix\/wp-json\/wp\/v2\/tags?post=1439"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}