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Zhang C, Joshi A, Liu Y, Sert O, Haddix SG, Teliska LH, Rasband A, Rodney GG, Rasband MN. Ankyrin-dependent Na + channel clustering prevents neuromuscular synapse fatigue. Curr Biol 2021; 31:3810-3819.e4. [PMID: 34289389 DOI: 10.1016/j.cub.2021.06.052] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 06/09/2021] [Accepted: 06/17/2021] [Indexed: 01/18/2023]
Abstract
Skeletal muscle contraction depends on activation of clustered acetylcholine receptors (AchRs) and muscle-specific Na+ channels (Nav1.4). Some Nav1.4 channels are highly enriched at the neuromuscular junction (NMJ), and their clustering is thought to be essential for effective muscle excitation. However, this has not been experimentally tested, and how NMJ Na+ channels are clustered is unknown. Here, using muscle-specific ankyrinR, ankyrinB, and ankyrinG single, double, and triple-conditional knockout mice, we show that Nav1.4 channels fail to cluster only after deletion of all three ankyrins. Remarkably, ankyrin-deficient muscles have normal NMJ morphology, AchR clustering, sarcolemmal levels of Nav1.4, and muscle force, and they show no indication of degeneration. However, mice lacking clustered NMJ Na+ channels have significantly reduced levels of motor activity and their NMJs rapidly fatigue after repeated nerve-dependent stimulation. Thus, the triple redundancy of ankyrins facilitates NMJ Na+ channel clustering to prevent neuromuscular synapse fatigue.
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Affiliation(s)
- Chuansheng Zhang
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | - Abhijeet Joshi
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | - Yanhong Liu
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | - Ozlem Sert
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | - Seth G Haddix
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | - Lindsay H Teliska
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | - Anne Rasband
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | - George G Rodney
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Matthew N Rasband
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA.
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Haddix SG, Rasband MN. Lose it to use it. J Cell Biol 2021; 220:211898. [PMID: 33734302 PMCID: PMC7980256 DOI: 10.1083/jcb.202102030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In this issue, Wang et al. (2021. J. Cell Biol.https://doi.org/10.1083/jcb.201911114) describe a phenomenon in which neuromuscular junction synapse elimination triggers myelination of terminal motor axon branches. They propose a mechanism initiated by synaptic pruning that depends on synaptic activity, cytoskeletal maturation, and the associated anterograde transport of trophic factors including Neuregulin 1-III.
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Affiliation(s)
- Seth G Haddix
- Department of Neuroscience, Baylor College of Medicine, Houston, TX
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Hastings RL, Massopust RT, Haddix SG, Lee YI, Thompson WJ. Exclusive vital labeling of myonuclei for studying myonuclear arrangement in mouse skeletal muscle tissue. Skelet Muscle 2020; 10:15. [PMID: 32381068 PMCID: PMC7204059 DOI: 10.1186/s13395-020-00233-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 04/23/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The arrangement of myonuclei in skeletal muscle tissue has long been used as a biomarker for muscle health, but there is a dearth of in vivo exploration of potential effects of myonuclear organization on the function and regeneration of skeletal muscle because traditional nuclear stains are performed on postmortem tissue. Therefore, we sought a transgenic method to produce a selective and persistent myonuclear label in whole muscles of living mice. METHODS We bred together a mouse line with skeletal muscle fiber-selective expression of Cre recombinase and a second mouse line with a Cre-inducible fluorescently tagged histone protein to generate a mouse line that produces a myonuclear label suitable for vital imaging and histology of fixed tissue. We tested the effectiveness of this vital label in three conditions known to generate abnormal myonuclear positioning. First, we injured myofibers of young mice with cardiotoxin. Second, this nuclear label was bred into a murine model of Duchenne muscular dystrophy. Finally, we examined old mice from this line that have undergone the natural aging process. Welch's t test was used to compare wild type and transgenic mice. RESULTS The resulting mouse line transgenically produces a vital red fluorescent label of myonuclei, which facilitates their in vivo imaging in skeletal muscle tissue. Transgenic fluorescent labeling of myonuclei has no significant effect on skeletal muscle function, as determined by twitch and tetanic force recordings. In each muscle examined, including those under damaged, dystrophic, and aged conditions, the labeled myonuclei exhibit morphology consistent with established literature, and reveal a specialized arrangement of subsynaptic myonuclei at the neuromuscular junction. CONCLUSIONS Taken together, our results demonstrate that this mouse line provides a versatile tool to selectively visualize myonuclei within both living and fixed preparations of healthy, injured, diseased, and aged muscles.
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Affiliation(s)
- Robert Louis Hastings
- Texas A&M Institute for Neuroscience, College Station, TX, USA.
- Department of Biology, Texas A&M University, College Station, TX, USA.
| | - Ryan T Massopust
- Texas A&M Institute for Neuroscience, College Station, TX, USA
- Department of Biology, Texas A&M University, College Station, TX, USA
| | - Seth G Haddix
- Texas A&M Institute for Neuroscience, College Station, TX, USA
- Department of Biology, Texas A&M University, College Station, TX, USA
| | - Young Il Lee
- Department of Biology, Texas A&M University, College Station, TX, USA
| | - Wesley J Thompson
- Texas A&M Institute for Neuroscience, College Station, TX, USA
- Department of Biology, Texas A&M University, College Station, TX, USA
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Haddix SG, Lee YI, Kornegay JN, Thompson WJ. Cycles of myofiber degeneration and regeneration lead to remodeling of the neuromuscular junction in two mammalian models of Duchenne muscular dystrophy. PLoS One 2018; 13:e0205926. [PMID: 30379896 PMCID: PMC6209224 DOI: 10.1371/journal.pone.0205926] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Accepted: 10/03/2018] [Indexed: 12/02/2022] Open
Abstract
Mice lacking the sarcolemmal protein dystrophin, designated mdx, have been widely used as a model of Duchenne muscular dystrophy. Dystrophic mdx mice as they mature develop notable morphological abnormalities to their neuromuscular junctions, the peripheral cholinergic synapses responsible for activating muscle fibers. Most obviously the acetylcholine receptor aggregates are fragmented into small non-continuous, islands. This contrasts with wild type mice whose acetylcholine receptor aggregates are continuous and pretzel-shaped in appearance. We show here that these abnormalities in mdx mice are also present in a canine model of Duchenne muscular dystrophy and provide additional evidence to support the hypothesis that NMJ remodeling occurs due to myofiber degeneration and regeneration. Using a method to investigate synaptic AChR replacement, we show that neuromuscular junction remodeling in mdx animals is caused by muscle fiber degeneration and regeneration at the synaptic site and is mimicked by deliberate myofiber injury in wild type mice. Importantly, the innervating motor axon plays a crucial role in directing the remodeling of the neuromuscular junction in dystrophy, as has been recorded in aging and deliberate muscle fiber injury in wild type mice. The remodeling occurs repetitively through the life of the animal and the changes in junctions become greater with age.
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Affiliation(s)
- Seth G. Haddix
- Texas A&M Institute for Neuroscience, Texas A&M University, College Station, Texas, United States of America
- * E-mail:
| | - Young il Lee
- Texas A&M Institute for Neuroscience, Texas A&M University, College Station, Texas, United States of America
- Department of Biology, Texas A&M University, College Station, Texas, United States of America
| | - Joe N. Kornegay
- Texas A&M Institute for Neuroscience, Texas A&M University, College Station, Texas, United States of America
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, Texas, United States of America
| | - Wesley J. Thompson
- Texas A&M Institute for Neuroscience, Texas A&M University, College Station, Texas, United States of America
- Department of Biology, Texas A&M University, College Station, Texas, United States of America
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Khaled SZ, Cevenini A, Yazdi IK, Parodi A, Evangelopoulos M, Corbo C, Scaria S, Hu Y, Haddix SG, Corradetti B, Salvatore F, Tasciotti E. One-pot synthesis of pH-responsive hybrid nanogel particles for the intracellular delivery of small interfering RNA. Biomaterials 2016; 87:57-68. [PMID: 26901429 PMCID: PMC4785811 DOI: 10.1016/j.biomaterials.2016.01.052] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 01/25/2016] [Indexed: 12/20/2022]
Abstract
This report describes a novel, one-pot synthesis of hybrid nanoparticles formed by a nanostructured inorganic silica core and an organic pH-responsive hydrogel shell. This easy-to-perform, oil-in-water emulsion process synthesizes fluorescently-doped silica nanoparticles wrapped within a tunable coating of cationic poly(2-diethylaminoethyl methacrylate) hydrogel in one step. Transmission electron microscopy and dynamic light scattering analysis demonstrated that the hydrogel-coated nanoparticles are uniformly dispersed in the aqueous phase. The formation of covalent chemical bonds between the silica and the polymer increases the stability of the organic phase around the inorganic core as demonstrated by thermogravimetric analysis. The cationic nature of the hydrogel is responsible for the pH buffering properties of the nanostructured system and was evaluated by titration experiments. Zeta-potential analysis demonstrated that the charge of the system was reversed when transitioned from acidic to basic pH and vice versa. Consequently, small interfering RNA (siRNA) can be loaded and released in an acidic pH environment thereby enabling the hybrid particles and their payload to avoid endosomal sequestration and enzymatic degradation. These nanoparticles, loaded with specific siRNA molecules directed towards the transcript of the membrane receptor CXCR4, significantly decreased the expression of this protein in a human breast cancer cell line (i.e., MDA-MB-231). Moreover, intravenous administration of siRNA-loaded nanoparticles demonstrated a preferential accumulation at the tumor site that resulted in a reduction of CXCR4 expression.
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Affiliation(s)
- Sm Z. Khaled
- Department of Regenerative Medicine: Center for Biomimetic Medicine, Houston Methodist Research Institute, Houston, Texas, 77030 United States
| | - Armando Cevenini
- Department of Regenerative Medicine: Center for Biomimetic Medicine, Houston Methodist Research Institute, Houston, Texas, 77030 United States
- Department of Molecular Medicine and Medical Biotechnology, University of Naples “Federico II”, Naples, 80131 Italy
- CEINGE-Biotecnologie Avanzate, s.c.a r.l., Naples, 80145 Italy
| | - Iman K. Yazdi
- Department of Regenerative Medicine: Center for Biomimetic Medicine, Houston Methodist Research Institute, Houston, Texas, 77030 United States
- Department of Biomedical Engineering, University of Houston, Houston, Texas, 77204 United States
| | - Alessandro Parodi
- Department of Regenerative Medicine: Center for Biomimetic Medicine, Houston Methodist Research Institute, Houston, Texas, 77030 United States
- Fondazione SDN IRCCS, Naples, 80143 Italy
| | - Michael Evangelopoulos
- Department of Regenerative Medicine: Center for Biomimetic Medicine, Houston Methodist Research Institute, Houston, Texas, 77030 United States
| | - Claudia Corbo
- Department of Regenerative Medicine: Center for Biomimetic Medicine, Houston Methodist Research Institute, Houston, Texas, 77030 United States
- Fondazione SDN IRCCS, Naples, 80143 Italy
| | - Shilpa Scaria
- Department of Regenerative Medicine: Center for Biomimetic Medicine, Houston Methodist Research Institute, Houston, Texas, 77030 United States
| | - Ye Hu
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas, 77030 United States
| | - Seth G. Haddix
- Department of Regenerative Medicine: Center for Biomimetic Medicine, Houston Methodist Research Institute, Houston, Texas, 77030 United States
| | - Bruna Corradetti
- Department of Regenerative Medicine: Center for Biomimetic Medicine, Houston Methodist Research Institute, Houston, Texas, 77030 United States
- Department of Life and Environmental Sciences, Università Politecnica delle Marche, Ancona, 60131 Italy
| | - Francesco Salvatore
- CEINGE-Biotecnologie Avanzate, s.c.a r.l., Naples, 80145 Italy
- Fondazione SDN IRCCS, Naples, 80143 Italy
| | - Ennio Tasciotti
- Department of Regenerative Medicine: Center for Biomimetic Medicine, Houston Methodist Research Institute, Houston, Texas, 77030 United States
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Parodi A, Haddix SG, Taghipour N, Scaria S, Taraballi F, Cevenini A, Yazdi IK, Corbo C, Palomba R, Khaled SZ, Martinez JO, Brown BS, Isenhart L, Tasciotti E. Bromelain surface modification increases the diffusion of silica nanoparticles in the tumor extracellular matrix. ACS Nano 2014; 8:9874-83. [PMID: 25119793 PMCID: PMC4212787 DOI: 10.1021/nn502807n] [Citation(s) in RCA: 118] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Accepted: 08/13/2014] [Indexed: 05/22/2023]
Abstract
Tumor extracellular matrix (ECM) represents a major obstacle to the diffusion of therapeutics and drug delivery systems in cancer parenchyma. This biological barrier limits the efficacy of promising therapeutic approaches including the delivery of siRNA or agents intended for thermoablation. After extravasation due to the enhanced penetration and retention effect of tumor vasculature, typical nanotherapeutics are unable to reach the nonvascularized and anoxic regions deep within cancer parenchyma. Here, we developed a simple method to provide mesoporous silica nanoparticles (MSN) with a proteolytic surface. To this extent, we chose to conjugate MSN to Bromelain (Br-MSN), a crude enzymatic complex, purified from pineapple stems, that belongs to the peptidase papain family. This surface modification increased particle uptake in endothelial, macrophage, and cancer cell lines with minimal impact on cellular viability. Most importantly Br-MSN showed an increased ability to digest and diffuse in tumor ECM in vitro and in vivo.
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Affiliation(s)
- Alessandro Parodi
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
- Fondazione SDN IRCCS, Naples 80143, Italy
| | - Seth G. Haddix
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
| | - Nima Taghipour
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
| | - Shilpa Scaria
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
| | - Francesca Taraballi
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
- Pain Therapy Service, Fondazione IRCCS Policlinico San Matteo, Pavia 27100, Italy
| | - Armando Cevenini
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
- Department of Molecular Medicine and Medical Biotechnology, University of Naples “Federico II”, Naples 80131, Italy
- CEINGE-Biotecnologie Avanzate, s.c.a r.l., Naples 80145, Italy
| | - Iman K. Yazdi
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
- Department of Biomedical Engineering, University of Houston, Houston, Texas 77204, United States
| | - Claudia Corbo
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
- Fondazione SDN IRCCS, Naples 80143, Italy
| | - Roberto Palomba
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
- Fondazione SDN IRCCS, Naples 80143, Italy
| | - Sm Z. Khaled
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
| | - Jonathan O. Martinez
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
- The University of Texas Health Science Center at Houston, Houston, Texas 77030, United States
| | - Brandon S. Brown
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
- The University of Texas Health Science Center at Houston, Houston, Texas 77030, United States
| | - Lucas Isenhart
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
| | - Ennio Tasciotti
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
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