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Satellite cell

Payam Mohassel, A Reghan Foley, Carsten G Bönnemann
Skeletal muscle function relies on the myofibrillar apparatus inside myofibers as well as an intact extracellular matrix surrounding each myofiber. Muscle extracellular matrix (ECM) plays several roles including but not limited to force transmission, regulation of growth factors and inflammatory responses, and influencing muscle stem cell (i.e. satellite cell) proliferation and differentiation. In most myopathies, muscle ECM undergoes remodeling and fibrotic changes that may be maladaptive for normal muscle function and recovery...
June 19, 2018: Matrix Biology: Journal of the International Society for Matrix Biology
Yichi Zhang, Simon G English, Kenneth B Storey
Xenopus laevis, otherwise known as the African clawed frog, undergoes natural dehydration of up to 30% of its total body water during the dry season in sub-Saharan Africa. To survive under these conditions, a variety of physiological and biochemical changes take place in X. laevis. We were interested in understanding the role that the calcineurin-NFAT pathway plays during dehydration stress response in the skeletal muscles of X. laevis. Immunoblotting was performed to characterize the protein levels of NFATc1-4, calcium signalling proteins, in addition to myogenic proteins (MyoD, MyoG, myomaker)...
June 19, 2018: Molecular Biology Reports
Pengfei Xu, Jens-Uwe Werner, Sebastian Milerski, Carmen M Hamp, Tatjana Kuzenko, Markus Jähnert, Pascal Gottmann, Luisa de Roy, Daniela Warnecke, Alireza Abaei, Annette Palmer, Markus Huber-Lang, Lutz Dürselen, Volker Rasche, Annette Schürmann, Martin Wabitsch, Uwe Knippschild
Injury to skeletal muscle affects millions of people worldwide. The underlying regenerative process however, is a very complex mechanism, time-wise highly coordinated, and subdivided in an initial inflammatory, a regenerative and a remodeling phase. Muscle regeneration can be impaired by several factors, among them diet-induced obesity (DIO). In order to evaluate if obesity negatively affects healing processes after trauma, we utilized a blunt injury approach to damage the extensor iliotibialis anticus muscle on the left hind limb of obese and normal weight C57BL/6J without showing any significant differences in force input between normal weight and obese mice...
2018: Frontiers in Physiology
Amanda M Brandt, Joanna M Kania, Madison L Gonzalez, Sally E Johnson
Hepatocyte growth factor (HGF) signals mediate mouse skeletal muscle stem cell, or satellite cell (SC), reentry into the cell cycle and myoblast proliferation. Because the athletic horse experiences exercise-induced muscle damage, the objective of the experiment was to determine the effect of HGF on equine SC (eqSC) bioactivity. Fresh isolates of adult eqSC were incubated with increasing concentrations of HGF and the initial time to DNA synthesis was measured. Media supplementation with HGF did not shorten (P > 0...
June 16, 2018: Journal of Animal Science
J C Laursen, R Somvanshi, U Kumar, B E Cairns, X-D Dong, L Arendt-Nielsen, P Gazerani
Background/aims Elevated concentrations of nitric oxide (NO) and glutamate (Glu) in the trigeminal ganglion (TG) may contribute to the development and maintenance of migraine headache. The role of satellite glial cells (SGC) and their pattern of substance release in relation to the pathophysiology of migraine are currently under investigation. In the present study, we investigated the release of NO from isolated trigeminal SGCs and its modulation by Glu. Methods SGCs from the TG of adult male Sprague-Dawley rats (n = 8) were isolated and maintained in culture until used...
December 29, 2017: Scandinavian Journal of Pain
D B Larsen, D Jørgensen, V Panchalingam, P Gazerani
Aims The present study investigated expression and overall function of transient receptor potential vanilloid-1 (TRPV1) on trigeminal ganglion (TG) neurons and satellite glial cells (SGCs) in a whole-organ culture model to provide further information on association of TG with craniofacial nociception. Methods For TRPV1 receptor expression on neurons and SGCs, immunohistochemistry was performed on 24 cultured trigeminal ganglia isolated from male adult Sprague-Dawley rats. For the functional assay, the cultured trigeminal ganglia were treated with graded concentrations of capsaicin (0...
December 29, 2017: Scandinavian Journal of Pain
Brian E Cairns, Lars Arendt-Nielsen, Paola Sacerdote
Background It is unknown why an acute pain condition under various circumstances can transition into a chronic pain condition. There has been a shift towards neuroinflammation and hence glial cell activations specifically in the dorsal root ganglion and spinal cord as a mechanism possibly driving the transition to chronic pain. This has led to a focus on non-neuronal cells in the peripheral and central nervous system. Besides infiltrating macrophages, Schwann cells and satellite glial cells release cytokines and therefore important mechanisms in the maintenance of pain...
December 29, 2017: Scandinavian Journal of Pain
Mladen Savikj, Maxwell A Ruby, Emil Kostovski, Per O Iversen, Juleen R Zierath, Anna Krook, Ulrika Widegren
Despite the well-known role of satellite cells in skeletal muscle plasticity, the effect of spinal cord injury on their function in humans remains unknown. We determined whether spinal cord injury affects the intrinsic ability of satellite cells to differentiate and produce metabolically healthy myotubes. We obtained vastus lateralis biopsies from eight spinal cord-injured and six able-bodied individuals. Satellite cells were isolated, grown and differentiated in vitro. Gene expression was measured by quantitative PCR...
June 2018: Physiological Reports
Yasuko Sagara, Masako Iwanaga, Maiko Morita, Yasuhiro Sagara, Hitomi Nakamura, Hideaki Hirayama, Kazuo Irita
Human T-cell leukemia virus type I (HTLV-1) infection is endemic in Japan, particularly clustered in the southwestern district, Kyushu-Okinawa, which consists of eight prefectures that further consist of 274 municipalities. However, no information is available about the fine-scale distribution of HTLV-1 infection within Kyushu-Okinawa. In order to assess the municipal-level distribution of people with HTLV-1 infection in Kyushu-Okinawa, we performed a cross-sectional study using a fine-scale geographic-information-system map based on HTLV-1 screening test results from the Japanese Red Cross database from September 2012 to February 2014...
June 13, 2018: Journal of Medical Virology
Aminu K Bello, Christine M Ribic, Serge H Cournoyer, Mercedeh Kiaii, Martine LeBlanc, Melanie Poulin-Costello, David N Churchill, Norman Muirhead
Background: Several studies have demonstrated harm associated with using erythropoiesis-stimulating agents (ESA) to achieve higher hemoglobin (Hb) levels. Subsequently, more conservative use of ESAs has changed anemia therapy in patients with chronic renal failure. Objective: The objectives were to identify transfusion rates in hemodialysis (HD) patients during the first year of therapy, to identify factors associated with the probability of transfusion, describe reasons for the transfusions, and identify the Hb values associated with each transfusion...
2018: Canadian Journal of Kidney Health and Disease
Zhaoxin Dai, Jean-Michel Guldmann, Yunfeng Hu
Understanding the relationship between urban land structure and land surface temperatures (LST) is important for mitigating the urban heat island (UHI). This paper explores this relationship within central Beijing, an area located within the 2nd Ring Road. The urban variables include the Normalized Difference Vegetation Index (NDVI), the Normalized Difference Build-up Index (NDBI), the area of building footprints, the area of main roads, the area of water bodies and a gravity index for parks that account for both park size and distance...
June 1, 2018: Science of the Total Environment
Jacob R Sorensen, Jordan D Fuqua, Michael R Deyhle, Jacob Parmley, Caitlin Skousen, Chad Hancock, Allen C Parcell, Robert D Hyldahl
BACKGROUND: Recent studies have highlighted the JAK/STAT signaling pathway in the regulation of muscle satellite cell behavior. Herein we report preclinical studies designed to characterize the effects of a novel JAK/STAT inhibitor on plantar flexor skeletal muscle function, morphology, and satellite cell content. METHODS: The compound, SGI-1252, was administered orally (400mg/kg) in a 10% dextrose solution to wild type mice (n = 6) 3 times per week for 8 weeks...
2018: PloS One
Kevin A Murach, Davis A Englund, Esther E Dupont-Versteegden, John J McCarthy, Charlotte A Peterson
Satellite cell-mediated myonuclear accretion is thought to be required for skeletal muscle fiber hypertrophy, and even drive hypertrophy by preceding growth. Recent studies in humans and rodents provide evidence that challenge this axiom. Specifically, Type 2 muscle fibers reliably demonstrate a substantial capacity to hypertrophy in the absence of myonuclear accretion, challenging the notion of a tightly regulated myonuclear domain (i.e., area that each myonucleus transcriptionally governs). In fact, a "myonuclear domain ceiling", or upper limit of transcriptional output per nucleus to support hypertrophy, has yet to be identified...
2018: Frontiers in Physiology
Richard Johansen, Richard Beck, Jakub Nowosad, Christopher Nietch, Min Xu, Song Shu, Bo Yang, Hongxing Liu, Erich Emery, Molly Reif, Joseph Harwood, Jade Young, Dana Macke, Mark Martin, Garrett Stillings, Richard Stumpf, Haibin Su
This study evaluated the performances of twenty-nine algorithms that use satellite-based spectral imager data to derive estimates of chlorophyll-a concentrations that, in turn, can be used as an indicator of the general status of algal cell densities and the potential for a harmful algal bloom (HAB). The performance assessment was based on making relative comparisons between two temperate inland lakes: Harsha Lake (7.99 km2 ) in Southwest Ohio and Taylorsville Lake (11.88 km2 ) in central Kentucky. Of interest was identifying algorithm-imager combinations that had high correlation with coincident chlorophyll-a surface observations for both lakes, as this suggests portability for regional HAB monitoring...
June 2018: Harmful Algae
Sonia Alonso-Martin, Frédéric Auradé, Despoina Mademtzoglou, Anne Rochat, Peter S Zammit, Frédéric Relaix
Muscle satellite cells are the primary source of stem cells for postnatal skeletal muscle growth and regeneration. Understanding genetic control of satellite cell formation, maintenance, and acquisition of their stem cell properties is on-going, and we have identified SOXF (SOX7, SOX17, SOX18) transcriptional factors as being induced during satellite cell specification. We demonstrate that SOXF factors regulate satellite cell quiescence, self-renewal and differentiation. Moreover, ablation of Sox17 in the muscle lineage impairs postnatal muscle growth and regeneration...
June 8, 2018: ELife
Luigi Formicola, Alice Pannérec, Rosa Maria Correra, Barbara Gayraud-Morel, David Ollitrault, Vanessa Besson, Shahragim Tajbakhsh, Jennifer Lachey, Jasbir S Seehra, Giovanna Marazzi, David A Sassoon
Degenerative myopathies typically display a decline in satellite cells coupled with a replacement of muscle fibers by fat and fibrosis. During this pathological remodeling, satellite cells are present at lower numbers and do not display a proper regenerative function. Whether a decline in satellite cells directly contributes to disease progression or is a secondary result is unknown. In order to dissect these processes, we used a genetic model to reduce the satellite cell population by ~70-80% which leads to a nearly complete loss of regenerative potential...
2018: Frontiers in Physiology
Naoki Ito, Isao Kii, Noriaki Shimizu, Hirotoshi Tanaka, Shin'ichi Takeda
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.
June 7, 2018: Scientific Reports
Kwame Doh, Ibou Thiam, Romulus Carmen Adechina Takin, Khaled Sonhaye, Gisèle Woto-Gaye
INTRODUCTION: Sebaceous lymphadenoma of the parotid (SLP) is a rare, benign tumor with similar epidemiological and macroscopic characteristics with other sebaceous differentiated tumors of the parotid (SDTP). The authors report a case of SLP in an 80-year-old woman. They then recall the distinctive histological and immunohistochemical criteria of SDTP. OBSERVATION: Mrs P. D. was received during a surgical consultation for the management of a painless right parotid swelling that has evolved for 10years, increasing slightly in volume...
June 4, 2018: Annales de Pathologie
Tim Snijders, Kirsten E Bell, Joshua P Nederveen, Nelson I Saddler, Nicole Mazara, Dinesh A Kumbhare, Stuart M Phillips, Gianni Parise
Background: Nutritional supplementation can have beneficial effects on body composition, strength, and function in older adults. However, whether the response of satellite cells can be altered by nutritional supplementation in older adults remains unknown. Objective: We assessed whether a multi-ingredient protein-based supplement taken over a prolonged period of time could alter the muscle satellite cell response after exercise in older men. Methods: Twenty-seven older men [mean ± SD age: 73 ± 1 y; mean ± SD body mass index (kg/m2): 28 ± 1] participated in a randomized double-blind experiment...
June 1, 2018: Journal of Nutrition
Hideaki Ohtsubo, Yusuke Sato, Yuji Matsuyoshi, Takahiro Suzuki, Wataru Mizunoya, Mako Nakamura, Ryuichi Tatsumi, Yoshihide Ikeuchi
The data presented in this article are related to the research articles entitled "APOBEC2 negatively regulates myoblast differentiation in muscle regeneration" and "Data supporting possible implication of APOBEC2 in self-renewal functions of myogenic stem satellite cells: toward understanding the negative regulation of myoblast differentiation" (Ohtsubo et al., 2017a, 2017b) [1,2]. This article provides in vivo phenotypical data to show that Paired Box Transcription Factor 7 (Pax7)-positive cell number (per myofiber) is significantly lower in APOBEC2 (a member of apoB mRNA editing enzyme, catalytic polypeptide-like family)-knockout muscle than the control wild-type tissue at the same age of 8-wk-old in mice...
April 2018: Data in Brief
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