ijms-logo

Journal Browser

Journal Browser

Molecular Advances in Neuromuscular Disorders: Spinal Muscular Atrophy and Beyond

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Neurobiology".

Deadline for manuscript submissions: closed (31 May 2023) | Viewed by 3678

Special Issue Editors


E-Mail Website
Guest Editor
Department of Veterinary Pathobiology, Bond Life Sciences Center, Room 471e, 1201 East Rollins Street, University of Missouri, Columbia, MO 65211, USA
Interests: molecular basis of neurodegeneration associated with neurodegenerative/neuromuscular disorders, including SMA and ALS

E-Mail Website
Guest Editor
SMATHERIA gGmbH – Non-Profit Biomedical Research Institute, Feodor-Lynen-Str. 31, D-30625 Hannover, Germany
Interests: preclinical and translational research on neurodegenerative and neuromuscular disorders (Spinal Muscular Atrophy, Amyotrophic Lateral Sclerosis)

Special Issue Information

Dear Colleagues,

Neuromuscular disorders are a group of neurodegenerative disorders characterized by degeneration of spinal motor neurons leading to muscle atrophy and life-threatening conditions. This Special Issue will focus on the molecular advances in the fields of spinal muscular atrophy (SMA), amyotrophic lateral sclerosis (ALS) and other motor neuron diseases, including SMA with respiratory distress type I (SMARD1). SMA and ALS have similarities and differences such as degeneration of spinal motor neurons but are quite different in terms of age and onset. For example, SMA is a childhood disease with early onset, whereas ALS is an adulthood disease with middle to late age onset. SMA is an autosomal recessive disease caused by mutation of the survival motor neurons 1 (SMN1) gene. In contrast, ALS has both inherited (familial) and sporadic forms, and the familial forms have been linked to distinct genes, including superoxide dismutase (SOD1), Senataxin (SETX) and C9orf72, associated with autosomal dominant and recessive inheritance patterns. ALS has degeneration of upper as well as lower motor neurons. Recent studies have suggested the possibility that common molecular defects in RNA metabolism and genomic instability may contribute to ALS and SMA pathogenesis. Recent advances in research suggest that common molecular mechanisms might mediate neurodegeneration among a wide spectrum of motor neuron diseases.

Prof. Dr. Laxman Gangwani
Prof. Dr. Peter Claus
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. International Journal of Molecular Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. There is an Article Processing Charge (APC) for publication in this open access journal. For details about the APC please see here. Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • SMA
  • ALS
  • SMARD1
  • neurodegeneration
  • motor neuron disorders

Published Papers (2 papers)

Order results
Result details
Select all
Export citation of selected articles as:

Research

17 pages, 2366 KiB  
Article
Nifedipine Ameliorates Cellular Differentiation Defects of Smn-Deficient Motor Neurons and Enhances Neuromuscular Transmission in SMA Mice
by Rocio Tejero, Mohammad Alsakkal, Luisa Hennlein, Ana M. Lopez-Cabello, Sibylle Jablonka and Lucia Tabares
Int. J. Mol. Sci. 2023, 24(8), 7648; https://doi.org/10.3390/ijms24087648 - 21 Apr 2023
Cited by 1 | Viewed by 1665
Abstract
In spinal muscular atrophy (SMA), mutations in or loss of the Survival Motor Neuron 1 (SMN1) gene reduce full-length SMN protein levels, which leads to the degeneration of a percentage of motor neurons. In mouse models of SMA, the development and [...] Read more.
In spinal muscular atrophy (SMA), mutations in or loss of the Survival Motor Neuron 1 (SMN1) gene reduce full-length SMN protein levels, which leads to the degeneration of a percentage of motor neurons. In mouse models of SMA, the development and maintenance of spinal motor neurons and the neuromuscular junction (NMJ) function are altered. Since nifedipine is known to be neuroprotective and increases neurotransmission in nerve terminals, we investigated its effects on cultured spinal cord motor neurons and motor nerve terminals of control and SMA mice. We found that application of nifedipine increased the frequency of spontaneous Ca2+ transients, growth cone size, cluster-like formations of Cav2.2 channels, and it normalized axon extension in SMA neurons in culture. At the NMJ, nifedipine significantly increased evoked and spontaneous release at low-frequency stimulation in both genotypes. High-strength stimulation revealed that nifedipine increased the size of the readily releasable pool (RRP) of vesicles in control but not SMA mice. These findings provide experimental evidence about the ability of nifedipine to prevent the appearance of developmental defects in SMA embryonic motor neurons in culture and reveal to which extent nifedipine could still increase neurotransmission at the NMJ in SMA mice under different functional demands. Full article
Show Figures

Graphical abstract

14 pages, 2954 KiB  
Article
Microscopic and Biochemical Hallmarks of BICD2-Associated Muscle Pathology toward the Evaluation of Novel Variants
by Andreas Unger, Andreas Roos, Andrea Gangfuß, Andreas Hentschel, Dieter Gläser, Karsten Krause, Kristina Doering, Ulrike Schara-Schmidt, Sabine Hoffjan, Matthias Vorgerd and Anne-Katrin Güttsches
Int. J. Mol. Sci. 2023, 24(7), 6808; https://doi.org/10.3390/ijms24076808 - 6 Apr 2023
Viewed by 1770
Abstract
BICD2 variants have been linked to neurodegenerative disorders like spinal muscular atrophy with lower extremity predominance (SMALED2) or hereditary spastic paraplegia (HSP). Recently, mutations in BICD2 were implicated in myopathies. Here, we present one patient with a known and six patients with novel [...] Read more.
BICD2 variants have been linked to neurodegenerative disorders like spinal muscular atrophy with lower extremity predominance (SMALED2) or hereditary spastic paraplegia (HSP). Recently, mutations in BICD2 were implicated in myopathies. Here, we present one patient with a known and six patients with novel BICD2 missense variants, further characterizing the molecular landscape of this heterogenous neurological disorder. A total of seven patients were genotyped and phenotyped. Skeletal muscle biopsies were analyzed by histology, electron microscopy, and protein profiling to define pathological hallmarks and pathogenicity markers with consecutive validation using fluorescence microscopy. Clinical and MRI-features revealed a typical pattern of distal paresis of the lower extremities as characteristic features of a BICD2-associated disorder. Histological evaluation showed myopathic features of varying severity including fiber size variation, lipofibromatosis, and fiber splittings. Proteomic analysis with subsequent fluorescence analysis revealed an altered abundance and localization of thrombospondin-4 and biglycan. Our combined clinical, histopathological, and proteomic approaches provide new insights into the pathophysiology of BICD2-associated disorders, confirming a primary muscle cell vulnerability. In this context, biglycan and thrombospondin-4 have been identified, may serve as tissue pathogenicity markers, and might be linked to perturbed protein secretion based on an impaired vesicular transportation. Full article
Show Figures

Figure 1

Back to TopTop