NEVER#448
Iron
- Joined
- Apr 30, 2026
- Posts
- 47
- Reputation
- 32
What are vibrations for the growth zone?
Vibration is a cyclic mechanical deformation with a high frequency and rate of strain change.What reactions occur in the growth zone when vibrations are applied to it?Vibrations deform the ECM through microdeformation of collagen II and aggrecan and pulsating fluid flow.This same fluid flow causes a change in osmotic pressure and the opening of TRPV4, which activates the Ca² mechanosignal.Fluid flow dramatically increases shear stress on chondrocyte membranes.Which mechanoreceptors are activated by vibrations?1) Integrin clusteringTheir main purpose is to convert mechanical deformation into a chemical response.2)
FAK activationThis occurs after clustering.FAK transmits the signal further through two main pathways: MAPK/ERKThey stimulate chondrocyte proliferation.PI3K/AKTThey suppress apoptosis.3) TRPV4 opening.TRPV4 is a physiological channel. Slow vibration moderately increases Ca²± through TRPV4, which supports the anabolic response.4) Piezo. Piezo1 and Piezo2 are mechanosensitive ion channels with a high threshold sensitivity that open upon rapid membrane deformation. They still open Ca²±.Ca² enhances the synthesis of catabolic genes, such as MMP13, which causes chondrocytes to enter a catabolic state.(Piezo inhibition reduces catabolic processes https://www.mdpi.com/1422-0067/24/4/4022)
"So, vibrations are complete bullshit because they actually damage chondrocytes?"Not quite so.How vibrations affect growth zones depends entirely on the vibration frequency and amplitude.Then what vibration frequency is optimal?Low-frequency, low-amplitude vibrations.With such vibrations, ECM deformation and fluid flow in the lacunae are moderate, so shear stress is low, and Ca²± signaling in this case does not lead to catabolism. Moderate Ca²± supports chondrocyte differentiation through increased Sox9 expression.TRPV4 signaling supports the survival and health of stem-like chondrocytes that supply the proliferative zone, preventing premature depletion of the growth zone.Vibration ApplicationLow-frequency vibration (20 Hz) reduced cartilage resorption and degradation and accelerated cartilage formation (https://pmc.ncbi.nlm.nih.gov/articles/PMC5472960/) .Low-frequency vibration increased the chondrogenesis markers Sox9 and BMP-7 (https://pubmed.ncbi.nlm.nih.gov/32791354/) .Conclusion: Low-frequency and low-amplitude vibrations have a beneficial effect on your growth zones without activating catabolic processes. In the long term,Low-frequency, low-amplitude vibrations stimulate chondrocyte proliferation and moderate hypertrophy in the growth plate, enhancing ECM synthesis (COL2A1, ACAN)Through TRPV4-mediated Ca²⁺ and activation of MAPK/ERK, PI3K/AKT, and FAK, supporting cell survival and stable growth plate architecture in the long term.
Vibration is a cyclic mechanical deformation with a high frequency and rate of strain change.What reactions occur in the growth zone when vibrations are applied to it?Vibrations deform the ECM through microdeformation of collagen II and aggrecan and pulsating fluid flow.This same fluid flow causes a change in osmotic pressure and the opening of TRPV4, which activates the Ca² mechanosignal.Fluid flow dramatically increases shear stress on chondrocyte membranes.Which mechanoreceptors are activated by vibrations?1) Integrin clusteringTheir main purpose is to convert mechanical deformation into a chemical response.2)
FAK activationThis occurs after clustering.FAK transmits the signal further through two main pathways: MAPK/ERKThey stimulate chondrocyte proliferation.PI3K/AKTThey suppress apoptosis.3) TRPV4 opening.TRPV4 is a physiological channel. Slow vibration moderately increases Ca²± through TRPV4, which supports the anabolic response.4) Piezo. Piezo1 and Piezo2 are mechanosensitive ion channels with a high threshold sensitivity that open upon rapid membrane deformation. They still open Ca²±.Ca² enhances the synthesis of catabolic genes, such as MMP13, which causes chondrocytes to enter a catabolic state.(Piezo inhibition reduces catabolic processes https://www.mdpi.com/1422-0067/24/4/4022)
"So, vibrations are complete bullshit because they actually damage chondrocytes?"Not quite so.How vibrations affect growth zones depends entirely on the vibration frequency and amplitude.Then what vibration frequency is optimal?Low-frequency, low-amplitude vibrations.With such vibrations, ECM deformation and fluid flow in the lacunae are moderate, so shear stress is low, and Ca²± signaling in this case does not lead to catabolism. Moderate Ca²± supports chondrocyte differentiation through increased Sox9 expression.TRPV4 signaling supports the survival and health of stem-like chondrocytes that supply the proliferative zone, preventing premature depletion of the growth zone.Vibration ApplicationLow-frequency vibration (20 Hz) reduced cartilage resorption and degradation and accelerated cartilage formation (https://pmc.ncbi.nlm.nih.gov/articles/PMC5472960/) .Low-frequency vibration increased the chondrogenesis markers Sox9 and BMP-7 (https://pubmed.ncbi.nlm.nih.gov/32791354/) .Conclusion: Low-frequency and low-amplitude vibrations have a beneficial effect on your growth zones without activating catabolic processes. In the long term,Low-frequency, low-amplitude vibrations stimulate chondrocyte proliferation and moderate hypertrophy in the growth plate, enhancing ECM synthesis (COL2A1, ACAN)Through TRPV4-mediated Ca²⁺ and activation of MAPK/ERK, PI3K/AKT, and FAK, supporting cell survival and stable growth plate architecture in the long term.
