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Spinobulbar muscular atrophy (SBMA) is an inherited neuromuscular disorder caused by the expansion of a CAG repeat encoding a polyglutamine tract in exon 1 of the androgen receptor (AR) gene. SBMA demonstrates androgen-dependent toxicity due to unfolding and aggregation of the mutant protein. There are currently no disease-modifying therapies, but of increasing interest for therapeutic targeting is autophagy, a highly conserved cellular process mediating protein quality control. We have previously shown that genetic manipulations inhibiting autophagy diminish skeletal muscle atrophy and extend the lifespan of AR113Q knock-in mice. In contrast, manipulations inducing autophagy worsen muscle atrophy, suggesting that chronic, aberrant upregulation of autophagy contributes to pathogenesis. Since the degree to which autophagy is altered in SBMA and the mechanisms responsible for such alterations are incompletely defined, we sought to delineate autophagic status in SBMA using both cellular and mouse models. Here, we confirm that autophagy is induced in cellular and knock-in mouse models of SBMA and show that the transcription factors transcription factor EB (TFEB) and ZKSCAN3 operate in opposing roles to underlie these changes. We demonstrate upregulation of TFEB target genes in skeletal muscle from AR113Q male mice and SBMA patients. Furthermore, we observe a greater response in AR113Q mice to physiological stimulation of autophagy by both nutrient starvation and exercise. Taken together, our results indicate that transcriptional signaling contributes to autophagic dysregulation and provides a mechanistic framework for the pathologic increase of autophagic responsiveness in SBMA.
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http://dx.doi.org/10.1093/hmg/ddt527 | DOI Listing |
Discov Oncol
December 2024
Department of Obstetrics and Gynecology, The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200030, China.
Objective: Endometrial cancer (EC) is the ninth most common malignancy among women. While mutations in JAK2 are frequently observed in EC, the specific biological functions of JAK2 in endometrial cancer are poorly understood.
Methods: The genetic alterations of JAK2 in different cancer types were explored using sequencing dataset deposited at TCGA database.
Discov Oncol
December 2024
Department of Gastroenterology, Qingdao Chengyang People's Hospital, Qingdao, China.
Gastric cancer (GC) remains a prevalent and aggressive malignancy with a poor prognosis. This study aimed to identify diagnostic and prognostic biomarkers while exploring their potential functions in GC. A total of 598 upregulated and 506 downregulated genes were identified in GC patients.
View Article and Find Full Text PDFProtein Sci
January 2025
Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, Illinois, USA.
Antimicrobial resistance is a significant cause of mortality globally due to infections, a trend that is expected to continue to rise. As existing treatments fail and new drug discovery slows, the urgency to develop novel antimicrobial therapeutics grows stronger. One promising strategy involves targeting bacterial systems exclusive to pathogens, such as the transcription regulator protein GabR.
View Article and Find Full Text PDFAging Cell
December 2024
Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas, USA.
Mesenchymal stem cells (MSCs) are promising candidates for regenerative therapies due to their self-renewal and differentiation capabilities. Pathological microenvironments expose MSCs to senescence-inducing factors such as reactive oxygen species (ROS), resulting in MSC functional decline and loss of stemness. Oxidative stress leads to mitochondrial dysfunction, a hallmark of senescence, and is prevalent in aging tissues characterized by elevated ROS levels.
View Article and Find Full Text PDFWorld Allergy Organ J
December 2024
Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, China.
Background: Asthma is a global chronic respiratory disease with complex pathogenesis. While current therapies offer some relief, they often fall short in effectively managing symptoms and preventing exacerbations for numerous patients. Thus, understanding its mechanisms and discovering new drug targets remains a pressing need for better treatment.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!