TRPV4 promotes acoustic wave-mediated BBB opening via Ca2+/PKC-δ pathway
Introduction: Numerous studies have shown the ability of low-energy acoustic waves such as focused ultrasound or shockwave to transiently open blood-brain barrier (BBB) and facilitate drug delivery to the brain. Preclinical and clinical evidences have well demonstrated the efficacy and safety in tre...
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doaj-7337743de5fa41a9bd0de281a71d29592020-11-25T03:05:19ZengElsevierJournal of Advanced Research2090-12322020-11-01261528TRPV4 promotes acoustic wave-mediated BBB opening via Ca2+/PKC-δ pathwayWei-Hao Liao0Ming-Yen Hsiao1Yi Kung2Hao-Li Liu3Jean-Christophe Béra4Claude Inserra5Wen-Shiang Chen6Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, TaiwanDepartment of Physical Medicine and Rehabilitation, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan; Institute of Biomedical Engineering, National Taiwan University, Taipei, TaiwanDepartment of Physical Medicine and Rehabilitation, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, TaiwanDepartment of Electrical Engineering, Chang Gung University, Taoyuan, TaiwanLabTAU, INSERM, Centre Léon Bérard, Université Lyon 1, Univ Lyon, F-69003 Lyon, FranceLabTAU, INSERM, Centre Léon Bérard, Université Lyon 1, Univ Lyon, F-69003 Lyon, FranceDepartment of Physical Medicine and Rehabilitation, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan; Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, Miaoli, Taiwan; Corresponding author at: Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan.Introduction: Numerous studies have shown the ability of low-energy acoustic waves such as focused ultrasound or shockwave to transiently open blood-brain barrier (BBB) and facilitate drug delivery to the brain. Preclinical and clinical evidences have well demonstrated the efficacy and safety in treating various brain disorders. However, the molecular mechanisms of acoustic waves on the BBB are still not fully understood. Objectives: The present study aimed at exploring the possible molecular mechanisms of acoustic wave stimulation on brains. Methods: Briefly describe the experimental design: The left hemisphere of the rat‘s brain was treated with pulsed ultrasound from a commercial focused shockwave or a planar ultrasound device, and the right hemisphere served as a control. One hour after the mechanical wave stimulation or overnight, the rats were sacrificed and the brains were harvested for protein or histological analysis. Agonists and antagonists related to the signal transduction pathways of tight junction proteins were used to investigate the possible intracellular mechanisms. Results: Intracellular signal transduction analysis shows calcium influx through transient receptor potential vanilloid 4 (TRPV4) channels, and the activation of PKC-δ pathway to mediate dissociation of ZO-1 and occludin after acoustic wave stimulation. The activation of TRPV4 or PKC-δ signaling further increased the expression level of TRPV4, suggesting a feedback loop to regulate BBB permeability. Moreover, the tight junction proteins dissociation can be reversed by administration of PKC-δ inhibitor and TRPV4 antagonist. Conclusion: The present study shows the crucial role of TRPV4 in acoustic wave-mediated BBB permeability, specifically its effect on compromising tight junction proteins, ZO-1 and occludin. Our findings provide a new molecular perspective to explain acoustic wave-mediated BBB opening. Moreover, activation of TRPV4 by agonists may reduce the threshold intensity level of acoustic waves for BBB opening, which may prevent undesirable mechanical damages while maintaining efficient BBB opening.http://www.sciencedirect.com/science/article/pii/S2090123220301211Blood–brain barrierAcoustic wavesShockwaveUltrasoundTRPV4PKC-δ |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Wei-Hao Liao Ming-Yen Hsiao Yi Kung Hao-Li Liu Jean-Christophe Béra Claude Inserra Wen-Shiang Chen |
spellingShingle |
Wei-Hao Liao Ming-Yen Hsiao Yi Kung Hao-Li Liu Jean-Christophe Béra Claude Inserra Wen-Shiang Chen TRPV4 promotes acoustic wave-mediated BBB opening via Ca2+/PKC-δ pathway Journal of Advanced Research Blood–brain barrier Acoustic waves Shockwave Ultrasound TRPV4 PKC-δ |
author_facet |
Wei-Hao Liao Ming-Yen Hsiao Yi Kung Hao-Li Liu Jean-Christophe Béra Claude Inserra Wen-Shiang Chen |
author_sort |
Wei-Hao Liao |
title |
TRPV4 promotes acoustic wave-mediated BBB opening via Ca2+/PKC-δ pathway |
title_short |
TRPV4 promotes acoustic wave-mediated BBB opening via Ca2+/PKC-δ pathway |
title_full |
TRPV4 promotes acoustic wave-mediated BBB opening via Ca2+/PKC-δ pathway |
title_fullStr |
TRPV4 promotes acoustic wave-mediated BBB opening via Ca2+/PKC-δ pathway |
title_full_unstemmed |
TRPV4 promotes acoustic wave-mediated BBB opening via Ca2+/PKC-δ pathway |
title_sort |
trpv4 promotes acoustic wave-mediated bbb opening via ca2+/pkc-δ pathway |
publisher |
Elsevier |
series |
Journal of Advanced Research |
issn |
2090-1232 |
publishDate |
2020-11-01 |
description |
Introduction: Numerous studies have shown the ability of low-energy acoustic waves such as focused ultrasound or shockwave to transiently open blood-brain barrier (BBB) and facilitate drug delivery to the brain. Preclinical and clinical evidences have well demonstrated the efficacy and safety in treating various brain disorders. However, the molecular mechanisms of acoustic waves on the BBB are still not fully understood. Objectives: The present study aimed at exploring the possible molecular mechanisms of acoustic wave stimulation on brains. Methods: Briefly describe the experimental design: The left hemisphere of the rat‘s brain was treated with pulsed ultrasound from a commercial focused shockwave or a planar ultrasound device, and the right hemisphere served as a control. One hour after the mechanical wave stimulation or overnight, the rats were sacrificed and the brains were harvested for protein or histological analysis. Agonists and antagonists related to the signal transduction pathways of tight junction proteins were used to investigate the possible intracellular mechanisms. Results: Intracellular signal transduction analysis shows calcium influx through transient receptor potential vanilloid 4 (TRPV4) channels, and the activation of PKC-δ pathway to mediate dissociation of ZO-1 and occludin after acoustic wave stimulation. The activation of TRPV4 or PKC-δ signaling further increased the expression level of TRPV4, suggesting a feedback loop to regulate BBB permeability. Moreover, the tight junction proteins dissociation can be reversed by administration of PKC-δ inhibitor and TRPV4 antagonist. Conclusion: The present study shows the crucial role of TRPV4 in acoustic wave-mediated BBB permeability, specifically its effect on compromising tight junction proteins, ZO-1 and occludin. Our findings provide a new molecular perspective to explain acoustic wave-mediated BBB opening. Moreover, activation of TRPV4 by agonists may reduce the threshold intensity level of acoustic waves for BBB opening, which may prevent undesirable mechanical damages while maintaining efficient BBB opening. |
topic |
Blood–brain barrier Acoustic waves Shockwave Ultrasound TRPV4 PKC-δ |
url |
http://www.sciencedirect.com/science/article/pii/S2090123220301211 |
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