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Tahaviev RV, Golovneva ES, Bryukhin GV. Effect of Infrared and Green Photomodulation Exposure on the Number of Active Myosatellite Cells in Regenerating Muscles. Bull Exp Biol Med 2024; 176:528-532. [PMID: 38492102 DOI: 10.1007/s10517-024-06061-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Indexed: 03/18/2024]
Abstract
Reparative properties of infrared laser exposure are well known, but the effects of green laser light are little studied. We analyzed the effects of short (60 sec) and longer (180 sec) exposure to infrared (980 nm) and green (520 nm) laser on the number of activated myosatellite cells in the regenerating m. gastrocnemius of Wistar rats after infliction of an incision wound. Histological preparations were used for morphometric evaluation of myosatellite cells with MyoD+ nuclei. Increased numbers of MyoD+ nuclei were observed on days 3 and 7 after 60-sec exposure to infrared and green laser.
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Affiliation(s)
- R V Tahaviev
- South Ural State Medical University, Ministry of Health of the Russian Federation, Chelyabinsk, Russia.
- Multidisciplinary Center of Laser Medicine, Chelyabinsk, Russia.
| | - E S Golovneva
- South Ural State Medical University, Ministry of Health of the Russian Federation, Chelyabinsk, Russia
- Multidisciplinary Center of Laser Medicine, Chelyabinsk, Russia
| | - G V Bryukhin
- South Ural State Medical University, Ministry of Health of the Russian Federation, Chelyabinsk, Russia
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2
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Naraoka Y, Mabuchi Y, Kiuchi M, Kumagai K, Hisamatsu D, Yoneyama Y, Takebe T, Akazawa C. Quality Control of Stem Cell-Based Cultured Meat According to Specific Differentiation Abilities. Cells 2024; 13:135. [PMID: 38247826 PMCID: PMC10814720 DOI: 10.3390/cells13020135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 01/06/2024] [Accepted: 01/09/2024] [Indexed: 01/23/2024] Open
Abstract
The demand for stem cell-based cultured meat as an alternative protein source is increasing in response to global food scarcity. However, the definition of quality controls, including appropriate growth factors and cell characteristics, remains incomplete. Cluster of differentiation (CD) 29 is ubiquitously expressed in bovine muscle tissue and is a marker of progenitor cells in cultured meat. However, CD29+ cells are naturally heterogeneous, and this quality control issue must be resolved. In this study, the aim was to identify the subpopulation of the CD29+ cell population with potential utility in cultured meat production. The CD29+ cell population exhibited heterogeneity, discernible through the CD44 and CD344 markers. CD29+CD44-CD344- cells displayed the ability for long-term culture, demonstrating high adipogenic potential and substantial lipid droplet accumulation, even within 3D cultures. Conversely, CD29+CD44+ cells exhibited rapid proliferation but were not viable for prolonged culture. Using cells suitable for adipocyte and muscle differentiation, we successfully designed meat buds, especially those rich in fat. Collectively, the identification and comprehension of distinct cell populations within bovine tissues contribute to quality control predictions in meat production. They also aid in establishing a stable and reliable cultured meat production technique.
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Grants
- JPMJMI18CB Japan Science and Technology Agency
- JP21H03328 Ministry of Education, Culture, Sports, Science and Technology
- JP19K19986 Ministry of Education, Culture, Sports, Science and Technology
- JP22K17699 Ministry of Education, Culture, Sports, Science and Technology
- no number Otsuka Holdings Co., Ltd.
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Affiliation(s)
- Yuna Naraoka
- Intractable Disease Research Center, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo-ku, Tokyo 113-8421, Japan; (Y.N.); (Y.M.); (M.K.); (K.K.); (D.H.)
| | - Yo Mabuchi
- Intractable Disease Research Center, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo-ku, Tokyo 113-8421, Japan; (Y.N.); (Y.M.); (M.K.); (K.K.); (D.H.)
- Department of Clinical Regenerative Medicine, Fujita Medical Innovation Center, Fujita Health University, 1-1-4, Hanedakuko, Ota-ku, Tokyo 144-0041, Japan
| | - Mai Kiuchi
- Intractable Disease Research Center, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo-ku, Tokyo 113-8421, Japan; (Y.N.); (Y.M.); (M.K.); (K.K.); (D.H.)
| | - Kyoko Kumagai
- Intractable Disease Research Center, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo-ku, Tokyo 113-8421, Japan; (Y.N.); (Y.M.); (M.K.); (K.K.); (D.H.)
| | - Daisuke Hisamatsu
- Intractable Disease Research Center, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo-ku, Tokyo 113-8421, Japan; (Y.N.); (Y.M.); (M.K.); (K.K.); (D.H.)
| | - Yosuke Yoneyama
- Institute of Research, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan; (Y.Y.); (T.T.)
| | - Takanori Takebe
- Institute of Research, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan; (Y.Y.); (T.T.)
- Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children Hospital Medical Center, Cincinnati, OH 45229-3039, USA
- Division of Developmental Biology, Cincinnati Children Hospital Medical Center, Cincinnati, OH 45229-3039, USA
- Center for Stem Cell and Organoid Medicine (CuSTOM), Cincinnati Children Hospital Medical Center, Cincinnati, OH 45229-3039, USA
- Premium Research Institute for Human Metaverse Medicine (WPI-PRIMe), Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
- Department of Genome Biology, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Chihiro Akazawa
- Intractable Disease Research Center, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo-ku, Tokyo 113-8421, Japan; (Y.N.); (Y.M.); (M.K.); (K.K.); (D.H.)
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3
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Ju WS, Seo K, Lee BR, Park MR, Lee MG, Byun SJ, Yang H, Kim Y, Ock SA. Potential Application of Muscle Precursor Cells from Male Specific-Pathogen-Free (SPF) Chicken Embryos in In Vitro Agriculture. Animals (Basel) 2023; 13:1887. [PMID: 37889836 PMCID: PMC10251866 DOI: 10.3390/ani13111887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 05/30/2023] [Accepted: 05/30/2023] [Indexed: 10/29/2023] Open
Abstract
This study examined the potential benefits of male specific-pathogen-free (SPF) White Leghorn embryos in cellular agriculture for sustainable and ethical poultry meat production-addressing traditional farming challenges, including disease outbreaks of Salmonella and Avian influenza. We isolated myogenic precursor cells (MPCs) from the thigh muscles (Musculus femoris) of 12.5-day-old embryos from 10 SPF White Leghorns that tested negative for Salmonella. We randomly selected MPCs from three males and three females, isolated them using a modified pre-plating (pp) method, and compared their in vitro development. After 1 h (pp1) and 2 h (pp2) of incubation, they were transferred to a new dish to remove fast-adhering cells and cultured (pp3). Isolated MPCs had a 69% positive reaction to Pax7. During proliferation, no differences were observed in PAX7, MYF5, or MYOD expression between the male and female MPCs. However, after five days of differentiation, the expression of late myogenic factors-MYOG and MYF6-significantly increased in all MPCs. Notably, MYOG expression was 1.9 times higher in female than in male MPCs. This impacted MYMK's expression pattern. Despite this, the myotube fusion index did not differ between the sexes. Muscle cells from male SPF-laying chicken embryos are promising for developing clean animal-cell-derived protein sources via resource recycling.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Sun-A Ock
- Animal Biotechnology Division, National Institute of Animal Science (NIAS), Rural Development Administration (RDA), 1500 Kongjwipatjwi-ro, Wanju-gun 565-851, JB, Republic of Korea
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4
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Swanson DL, Zhang Y, Jimenez AG. Skeletal muscle and metabolic flexibility in response to changing energy demands in wild birds. Front Physiol 2022; 13:961392. [PMID: 35936893 PMCID: PMC9353400 DOI: 10.3389/fphys.2022.961392] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2022] [Accepted: 06/29/2022] [Indexed: 12/20/2022] Open
Abstract
Phenotypically plastic responses of animals to adjust to environmental variation are pervasive. Reversible plasticity (i.e., phenotypic flexibility), where adult phenotypes can be reversibly altered according to prevailing environmental conditions, allow for better matching of phenotypes to the environment and can generate fitness benefits but may also be associated with costs that trade-off with capacity for flexibility. Here, we review the literature on avian metabolic and muscle plasticity in response to season, temperature, migration and experimental manipulation of flight costs, and employ an integrative approach to explore the phenotypic flexibility of metabolic rates and skeletal muscle in wild birds. Basal (minimum maintenance metabolic rate) and summit (maximum cold-induced metabolic rate) metabolic rates are flexible traits in birds, typically increasing with increasing energy demands. Because skeletal muscles are important for energy use at the organismal level, especially to maximum rates of energy use during exercise or shivering thermogenesis, we consider flexibility of skeletal muscle at the tissue and ultrastructural levels in response to variations in the thermal environment and in workloads due to flight exercise. We also examine two major muscle remodeling regulatory pathways: myostatin and insulin-like growth factor -1 (IGF-1). Changes in myostatin and IGF-1 pathways are sometimes, but not always, regulated in a manner consistent with metabolic rate and muscle mass flexibility in response to changing energy demands in wild birds, but few studies have examined such variation so additional study is needed to fully understand roles for these pathways in regulating metabolic flexibility in birds. Muscle ultrastrutural variation in terms of muscle fiber diameter and associated myonuclear domain (MND) in birds is plastic and highly responsive to thermal variation and increases in workload, however, only a few studies have examined ultrastructural flexibility in avian muscle. Additionally, the relationship between myostatin, IGF-1, and satellite cell (SC) proliferation as it relates to avian muscle flexibility has not been addressed in birds and represents a promising avenue for future study.
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Affiliation(s)
- David L. Swanson
- Department of Biology, University of South Dakota, Vermillion, SD, United States
| | - Yufeng Zhang
- College of Health Science, University of Memphis, Memphis, TN, United States
| | - Ana Gabriela Jimenez
- Department of Biology, Colgate University, Hamilton, NY, United States
- *Correspondence: Ana Gabriela Jimenez,
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Knežić T, Janjušević L, Djisalov M, Yodmuang S, Gadjanski I. Using Vertebrate Stem and Progenitor Cells for Cellular Agriculture, State-of-the-Art, Challenges, and Future Perspectives. Biomolecules 2022; 12:699. [PMID: 35625626 PMCID: PMC9138761 DOI: 10.3390/biom12050699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 05/01/2022] [Accepted: 05/07/2022] [Indexed: 12/19/2022] Open
Abstract
Global food systems are under significant pressure to provide enough food, particularly protein-rich foods whose demand is on the rise in times of crisis and inflation, as presently existing due to post-COVID-19 pandemic effects and ongoing conflict in Ukraine and resulting in looming food insecurity, according to FAO. Cultivated meat (CM) and cultivated seafood (CS) are protein-rich alternatives for traditional meat and fish that are obtained via cellular agriculture (CA) i.e., tissue engineering for food applications. Stem and progenitor cells are the building blocks and starting point for any CA bioprocess. This review presents CA-relevant vertebrate cell types and procedures needed for their myogenic and adipogenic differentiation since muscle and fat tissue are the primary target tissues for CM/CS production. The review also describes existing challenges, such as a need for immortalized cell lines, or physical and biochemical parameters needed for enhanced meat/fat culture efficiency and ways to address them.
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Affiliation(s)
- Teodora Knežić
- Center for Biosystems, BioSense Institute, University of Novi Sad, Dr. Zorana Djindjica 1, 21000 Novi Sad, Serbia; (T.K.); (L.J.); (M.D.)
| | - Ljiljana Janjušević
- Center for Biosystems, BioSense Institute, University of Novi Sad, Dr. Zorana Djindjica 1, 21000 Novi Sad, Serbia; (T.K.); (L.J.); (M.D.)
| | - Mila Djisalov
- Center for Biosystems, BioSense Institute, University of Novi Sad, Dr. Zorana Djindjica 1, 21000 Novi Sad, Serbia; (T.K.); (L.J.); (M.D.)
| | - Supansa Yodmuang
- Research Affairs, Faculty of Medicine, Chulalongkorn University, 1873 Rama 4 Rd, Pathumwan, Bangkok 10330, Thailand;
| | - Ivana Gadjanski
- Center for Biosystems, BioSense Institute, University of Novi Sad, Dr. Zorana Djindjica 1, 21000 Novi Sad, Serbia; (T.K.); (L.J.); (M.D.)
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Bioengineering Outlook on Cultivated Meat Production. MICROMACHINES 2022; 13:mi13030402. [PMID: 35334693 PMCID: PMC8950996 DOI: 10.3390/mi13030402] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 02/21/2022] [Accepted: 02/23/2022] [Indexed: 02/04/2023]
Abstract
Cultured meat (also referred to as cultivated meat or cell-based meat)—CM—is fabricated through the process of cellular agriculture (CA), which entails application of bioengineering, i.e., tissue engineering (TE) principles to the production of food. The main TE principles include usage of cells, grown in a controlled environment provided by bioreactors and cultivation media supplemented with growth factors and other needed nutrients and signaling molecules, and seeded onto the immobilization elements—microcarriers and scaffolds that provide the adhesion surfaces necessary for anchor-dependent cells and offer 3D organization for multiple cell types. Theoretically, many solutions from regenerative medicine and biomedical engineering can be applied in CM-TE, i.e., CA. However, in practice, there are a number of specificities regarding fabrication of a CM product that needs to fulfill not only the majority of functional criteria of muscle and fat TE, but also has to possess the sensory and nutritional qualities of a traditional food component, i.e., the meat it aims to replace. This is the reason that bioengineering aimed at CM production needs to be regarded as a specific scientific discipline of a multidisciplinary nature, integrating principles from biomedical engineering as well as from food manufacturing, design and development, i.e., food engineering. An important requirement is also the need to use as little as possible of animal-derived components in the whole CM bioprocess. In this review, we aim to present the current knowledge on different bioengineering aspects, pertinent to different current scientific disciplines but all relevant for CM engineering, relevant for muscle TE, including different cell sources, bioreactor types, media requirements, bioprocess monitoring and kinetics and their modifications for use in CA, all in view of their potential for efficient CM bioprocess scale-up. We believe such a review will offer a good overview of different bioengineering strategies for CM production and will be useful to a range of interested stakeholders, from students just entering the CA field to experienced researchers looking for the latest innovations in the field.
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Golkar-Narenji A, Antosik P, Nolin S, Rucinski M, Jopek K, Zok A, Sobolewski J, Jankowski M, Zdun M, Bukowska D, Stefańska K, Jaśkowski JM, Piotrowska-Kempisty H, Mozdziak P, Kempisty B. Gene Ontology Groups and Signaling Pathways Regulating the Process of Avian Satellite Cell Differentiation. Genes (Basel) 2022; 13:genes13020242. [PMID: 35205287 PMCID: PMC8871586 DOI: 10.3390/genes13020242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 01/24/2022] [Accepted: 01/25/2022] [Indexed: 02/04/2023] Open
Abstract
Modern science is becoming increasingly committed to environmentally friendly solutions, mitigating the impact of the developing human civilisation on the environment. One of the leading fields aimed at sustainable agriculture is in vitro meat production. Cellular agriculture aims to provide a source of animal-free meat products, which would decrease worldwide nutritional dependency on animal husbandry, thereby reducing the significant impact of this industry on Earth’s climate. However, while some studies successfully produced lab-based meat on a small scale, scalability of this approach requires significant optimisation of the methodology in order to ensure its viability on an industrial scale. One of the methodological promises of in vitro meat production is the application of cell suspension-based bioreactors. Hence, this study focused on a complex transcriptomic comparison of adherent undifferentiated, differentiated and suspension-cultured myosatellite cells, aiming to determine the effects of different culture methods on their transcriptome. Modern next-generation sequencing (RNAseq) was used to determine the levels of transcripts in the cultures’ cell samples. Then, differential expression and pathway analyses were performed using bionformatical methods. The significantly regulated pathways included: EIF2, mTOR, GP6, integrin and HIFα signalling. Differential regulation of gene expression, as well as significant enrichment and modulation of pathway activity, suggest that suspension culture potentially promotes the ex vivo-associated loss of physiological characteristics and gain of plasticity. Therefore, it seems that suspension cultures, often considered the desired method for in vitro meat production, require further investigation to fully elucidate their effect on myosatellite cells and, therefore, possibly enable their easier scalability to ensure suitability for industrial application.
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Affiliation(s)
- Afsaneh Golkar-Narenji
- Prestage Department of Poultry Sciences, North Carolina State University, Raleigh, NC 27695, USA; (A.G.-N.); (S.N.); (P.M.)
| | - Paweł Antosik
- Department of Veterinary Surgery, Institute of Veterinary Medicine, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland;
| | - Shelly Nolin
- Prestage Department of Poultry Sciences, North Carolina State University, Raleigh, NC 27695, USA; (A.G.-N.); (S.N.); (P.M.)
| | - Marcin Rucinski
- Department of Histology and Embryology, Poznan University of Medical Sciences, 60-701 Poznan, Poland; (M.R.); (K.J.); (K.S.)
| | - Karol Jopek
- Department of Histology and Embryology, Poznan University of Medical Sciences, 60-701 Poznan, Poland; (M.R.); (K.J.); (K.S.)
| | - Agnieszka Zok
- Division of Philosophy of Medicine and Bioethics, Poznan University of Medical Sciences, 60-701 Poznan, Poland;
- Department of Social Sciences and Humanities, Poznan University of Medical Sciences, 60-701 Poznan, Poland
| | - Jarosław Sobolewski
- Department of Public Health Protection and Animal Welfare, Institute of Veterinary Medicine, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland;
| | - Maurycy Jankowski
- Department of Anatomy, Poznan University of Medical Sciences, 60-701 Poznan, Poland;
| | - Maciej Zdun
- Department of Basic and Preclinical Sciences, Institute of Veterinary Medicine, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland; (M.Z.); (H.P.-K.)
| | - Dorota Bukowska
- Department of Diagnostics and Clinical Sciences, Institute of Veterinary Medicine, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland; (D.B.); (J.M.J.)
| | - Katarzyna Stefańska
- Department of Histology and Embryology, Poznan University of Medical Sciences, 60-701 Poznan, Poland; (M.R.); (K.J.); (K.S.)
| | - Jędrzej M. Jaśkowski
- Department of Diagnostics and Clinical Sciences, Institute of Veterinary Medicine, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland; (D.B.); (J.M.J.)
| | - Hanna Piotrowska-Kempisty
- Department of Basic and Preclinical Sciences, Institute of Veterinary Medicine, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland; (M.Z.); (H.P.-K.)
- Department of Toxicology, Poznan University of Medical Sciences, 60-701 Poznan, Poland
| | - Paul Mozdziak
- Prestage Department of Poultry Sciences, North Carolina State University, Raleigh, NC 27695, USA; (A.G.-N.); (S.N.); (P.M.)
| | - Bartosz Kempisty
- Prestage Department of Poultry Sciences, North Carolina State University, Raleigh, NC 27695, USA; (A.G.-N.); (S.N.); (P.M.)
- Department of Veterinary Surgery, Institute of Veterinary Medicine, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland;
- Department of Histology and Embryology, Poznan University of Medical Sciences, 60-701 Poznan, Poland; (M.R.); (K.J.); (K.S.)
- Department of Anatomy, Poznan University of Medical Sciences, 60-701 Poznan, Poland;
- Correspondence:
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Abstract
The avian pectoralis muscle demonstrates plasticity with regard to size, so that temperate birds facing winter conditions or birds enduring a migration bout tend to have significant increases in the size and mass of this tissue due to muscular hypertrophy. Myonuclear domain (MND), the volume of cytoplasm a myonuclei services, in the pectoralis muscle of birds seems to be altered during thermal stress or changing seasons. However, there is no information available regarding muscle DNA content or ploidy level within the avian pectoralis. Changes in muscle DNA content can be used in this tissue to aid in size and mass changes. Here, we hypothesized that long-distance migrants or temperate residents would use the process of endoreduplication to aid in altering muscle size. Mostly contradictory to our hypotheses, we found no differences in the mean muscle DNA content in any of the 62 species of birds examined in this study. We also found no correlations between mean muscle DNA content and other muscle structural measurements, such as the number of nuclei per millimeter of fiber, myonuclear domain, and fiber cross-sectional area. Thus, while avian muscle seems more phenotypically plastic than mammalian muscle, the biological processes surrounding myonuclear function may be more closely related to those seen in mammals.
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Affiliation(s)
- Ana Gabriela Jimenez
- Department of Biology, Colgate University, Hamilton, NY 13346, USA.,Department of Biology, Colgate University, Hamilton, NY 13346, USA
| | - Emily Gray Lencyk
- Department of Biology, Colgate University, Hamilton, NY 13346, USA.,Department of Biology, Colgate University, Hamilton, NY 13346, USA
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De Jesus AD, Jimenez AG. Effects of acute temperature increases on House sparrow (Passer domesticus) pectoralis muscle myonuclear domain. JOURNAL OF EXPERIMENTAL ZOOLOGY PART 2021; 337:150-158. [PMID: 34516707 DOI: 10.1002/jez.2544] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 08/25/2021] [Accepted: 09/01/2021] [Indexed: 11/09/2022]
Abstract
With rapid climate change, heat wave episodes have become more intense and more frequent. This poses a significant threat to animals, and forces them to manage these physiologically challenging conditions by adapting and/or moving. As an invasive species with a large niche breadth, House sparrows (Passer domesticus) exhibit high phenotypic flexibility that caters to seasonal changes in function and metabolism. For example, their pectoral muscle complex exhibits size and mass plasticity with winter and summer acclimation. Here, we investigated the effects of acute whole-organism heat stress to 43°C on cellular-level changes in House sparrow pectoralis muscle myonuclear domain (MND), the volumetric portion each nucleus is responsible for, that have gone overlooked in the current literature. House sparrows were separated into a control group, a heat-shocked group subjected to thermal stress at 43°C for 24 h, and a recovery group that was returned to room temperature for 24 h after experiencing the same temperature treatment. Here, we found that heat-shocked and recovery groups demonstrated a decrease in number of nuclei per millimeter of fiber and increase in MND, when compared with the control. We also found a significant positive correlation between fiber diameter and MND in the recovery group, suggesting the possibility that nuclei number constrains the extent of muscle fiber size. Together, these results show that acute heat shock alters House sparrow pectoralis muscle cellular physiology in a rigid way that could prove detrimental to long-term muscle integrity and performance.
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