• The Korean Journal of Physiology and Pharmacology
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• 제27권3호
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• pp.277-287
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• 2023

Actin dynamics play an essential role in myogenesis through multiple mechanisms, such as mechanotransduction, cell proliferation, and myogenic differentiation. Twinfilin-1 (TWF1), an actin-depolymerizing protein, is known to be required for the myogenic differentiation of progenitor cells. However, the mechanisms by which they epigenetically regulate TWF1 by microRNAs under muscle wasting conditions related to obesity are almost unknown. Here, we investigated the role of miR-103-3p in TWF1 expression, actin filament modulation, proliferation, and myogenic differentiation of progenitor cells. Palmitic acid, the most abundant saturated fatty acid (SFA) in the diet, reduced TWF1 expression and impeded myogenic differentiation of C2C12 myoblasts, while elevating miR-103-3p levels in myoblasts. Interestingly, miR-103-3p inhibited TWF1 expression by directly targeting its 3'UTR. Furthermore, ectopic expression of miR-103-3p reduced the expression of myogenic factors, i.e., MyoD and MyoG, and subsequently impaired myoblast differentiation. We demonstrated that miR-103-3p induction increased filamentous actin (F-actin) and facilitated the nuclear translocation of Yes-associated protein 1 (YAP1), thereby stimulating cell cycle progression and cell proliferation. Hence, this study suggests that epigenetic suppression of TWF1 by SFA-inducible miR-103-3p impairs myogenesis by enhancing the cell proliferation triggered by F-actin/YAP1.

• 한국가금학회지
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• 제47권3호
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• pp.127-133
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• 2020

Chibby family member 2(CBY2)은 Chibby-like super family domain을 가지고 있으며, SPERT 또는 NURIT 등으로도 알려져 있지만, 그 기능이 많이 알려져 있지는 않다. 본 연구에서는 메추리 CBY2 유전자를 클로닝하여 그 서열을 분석하고, QM7 메추리 근육 세포의 근육발생에서의 역할을 분석하였다. 메추리 CBY2의 코딩 서열은 978개의 염기로 이루어져 있으며, 이는 325개의 아미노산으로 번역되어진다. 메추리 CBY2는 닭의 CBY2와 가장 유사했으며, 이들 조류의 CBY2는 진화 역사상 일찍이 포유류의 CBY2와 나뉘어진 것으로 분석되었다. 단백질 도메인 예측 분석 결과, 메추리 CBY2는 N-말단 쪽에, 포유류와 비교 시 상이한 아미노산을 많이 갖고는 있지만, 83개의 아미노산으로 이루어진 Chibby-like superfamily domain을 가진 것으로 확인되었다. 메추리의 다양한 조직 중 CBY2는 지방조직에서 가장 많이 발현했으며, 간, 심장, 신장에서는 중간 또는 낮은 정도로 발현했고, 대흉근에서는 극히 낮은 발현을 보였다. CBY2의 근육발생에서의 역할을 분석하기 위해 CBY2를 QM7 세포에 과발현시킨 결과, CBY2가 근육발생을 억제하는 것을 확인할 수 있었으며, 근관의 넓이를 수치화해 비교해본 결과, 그 면적이 대조구의 약 25%밖에 되지 않았다. 결론적으로 메추리 CBY2는 Chibby-like superfamily domain을 가지고 있으며, 근육발생을 억제하는 특성이 있다. 추후 연구는 CBY2가 근육발생을 억제하는 기작을 밝혀내는데 중점을 두어야 할 것이다.

• 한국동물학회:학술대회논문집
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• 한국동물학회 1994년도 한국생물과학협회 학술발표대회
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• pp.175.2-175
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• 1994

No Abstract, See Full Text

• Asian-Australasian Journal of Animal Sciences
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• 제24권5호
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• pp.685-695
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• 2011

Satellite cells are skeletal muscle progenitor/stem cells that reside between the basal lamina and plasma membranes of skeletal fibers in vivo. These cells can give rise to both myogenic and adipogenic cells. Given the possible role for differentiation of satellite cells into adipocytes in marbling and in some pathological disorders like sarcopenia, knowledge of the proteins involved in such process remains obscure. Using two-dimensional polyacrylamide gel electrophoresis coupled with mass spectrometry, we investigated the proteins that are differentially expressed during adipogenic differentiation of satellite cells from bovine longissimus muscle. Our proteome mapping strategy to identify the differentially expressed intracellular proteins during adipogenic differentiation revealed a total of 25 different proteins. The proteins up-regulated during adipogenic differentiation of satellite cells like Cathepsin H precursor, Retinal dehydrogenase 1, Enoyl-CoA hydratase, Ubiquinol-cytochrome-c reductase, T-complex protein 1 subunit beta and ATP synthase D chain were found to be associated with lipid metabolism. The down-regulated proteins like LIM protein, annexin proteins, cofilin-1, Rho GDP-dissociation inhibitor 1 and septin-2, identified in the present study were found to be associated with myogenesis. These results clearly demonstrate that the adipogenic conversion of muscle satellite cells is associated with the up-regulated and down-regulated proteins involved in adipogenesis and myogenesis respectively.

• 한국발생생물학회지:발생과생식
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• 제18권4호
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• pp.251-258
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• 2014

Serine-arginine-rich nuclear protein LUC7L plays an important role in the regulation of myogenesis in mice. In the present study, we isolated and characterized the Korean rose bitterling Rhodeus uyekii Luc7l cDNA, designated RuLuc7l. The RuLuc7l cDNA is 1,688 bp long and encodes a 364-amino-acid polypeptide containing serine/arginine-rich region at the C-terminus. The deduced RuLuc7l protein has high amino acid identity (71-97%) with those of other species including human. Phylogenetic analysis revealed that RuLUC7L clustered with fish LUC7L proteins. The expression of RuLuc7l mRNA was high in the brain, kidney, and stomach of Korean rose bitterling. Expression of the RuLuc7l mRNA was detected from 1 day post-fertilization (dpf) and moderately increased until 21 dpf during the early development. Further investigations are required to elucidate the functional role of RuLUC7L in myogenesis in R. uyekii.

• 생명과학회지
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• 제12권1호
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• pp.55-60
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• 2002

골격근 세포의 분화는 근육특이 유전자들의 전사적 활성과 근육아세포에서 근육소관으로의 형태적 분화로 특징지어진다. 본 연구에서는 TSA가 근육형성의 일련의 과정에서 NF-kB DNA 결합 활성과 융합에 미치는 영향을 조사하였다. 대조군과 비교해서 TSA가 처리된 C2C12 myoblast는 융합하여 근육소관을 형성할 수 없었으며 NF-kB DNA 결합 활성은 억제되었다. 이런 현상들이 TSA에 의한 직접적인 것인지 알아보기 위해서 TSA가 처리되지 않고 분화를 유도하기 위해서 사용된 배지를 농축하여 C2C12 myoblast에 TSA와 함께 동시에 처리하였다. 그 결과 세포는 융합하여 근육소관을 형성하였으며 NF-kB DNA 결합 활성이 회복되었다. 이러한 결과는 TSA가 아마도 여러 관련 인자들을 통해 myoblast의 융합과 NF-kB DNA 결합 활성을 억제함으로 근육형성과정에 영향을 미침을 시사한다.

• Journal of Animal Science and Technology
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• 제65권1호
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• pp.16-31
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• 2023

Cultured meat is a potential sustainable food generated by the in vitro myogenesis of muscle satellite (stem) cells (MSCs). The self-renewal and differentiation properties of MSCs are of primary interest for cultured meat production. MSC proliferation and differentiation are influenced by a variety of growth factors such as insulin-like growth factors (IGF-1 and IGF-2), transforming growth factor beta (TGF-β), fibroblast growth factors (FGF-2 and FGF-21), platelet-derived growth factor (PDGF) and hepatocyte growth factor (HGF) and by hormones like insulin, testosterone, glucocorticoids, and thyroid hormones. In this review, we investigated the roles of growth factors and hormones during cultured meat production because these factors provide signals for MSC growth and structural stability. The aim of this article is to provide the important idea about different growth factors such as FGF (enhance the cell proliferation and differentiation), IGF-1 (increase the number of myoblasts), PDGF (myoblast proliferation), TGF-β1 (muscle repair) and hormones such as insulin (cell survival and growth), testosterone (muscle fiber size), dexamethasone (myoblast proliferation and differentiation), and thyroid hormones (amount and diameter of muscle fibers and determine the usual pattern of fiber distributions) as media components during myogenesis for cultured meat production.

• 대한한의학회지
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• 제27권3호
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• pp.26-37
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• 2006

Determination and differentiation of cells in the skeletal muscle lineage is positively regulated by cell-cell contact. Differentiation proteins proposed to mediate this effect include both classical MyoD and MEF members; potential interactions between the promyogenic activities of these classes of protein, however, are unknown. We show here that MyoD and MEF, two promyogenic family members that relate to each other in a cis fashion, form interactions with MyoD and MEF. These proteins contain myosin-heavy chainsand are enriched at sites of cell-cell contact between myoblasts. Therefore, in differentiation of MyoD and MEF from Chungsimyeonjaeum interact dependently, suggesting that the interactions occur in a cis fashion; consistent with this conclusion, MyoD-mediated differentiation is required for myoblasts to occur by Chungsimyeonjaeum. Inhibition in myoblasts of a MyoD by Staurosporine in its ability to associate with MEF interferes with differentiation as assessed by morphological and transcription levels, suggesting that this interaction is functionally important in myogenesis. Also, some of the differentiation-mediated proteins that are required for myogenesis seem to be based on interdependent activities of the promyogenic classical smad-subfamily.

• Journal of Animal Science and Technology
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• 제54권3호
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• pp.219-226
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• 2012

Gender specificity in muscle growth and development is well known. Genesis of muscle is dependent on proliferation and differentiation potential of resident myogenic satellite cells (MSCs) present in muscle fibers. Multipotential capacity of forming myocyte, osteocyte, and adipocyte like cell makes MSCs a unique stem cell. To understand the molecular mechanism involved in determination of muscle quality due to difference in hormone concentration of different gender of animals, MSCs were isolated from bovine skeletal muscle and cultured in male, female, and castrated serum supplemented media. DNA microarray used consisted of 24,000 spots with 70 mer oligo in each spot. A total of 88 genes were up-regulated and 551 genes were down-regulated by more than two fold. Among up-regulated gene, 33, 34, and 21 genes were found up-regulated in cells grown in male, female, and castrated serum, respectively. Interestingly, male serum showed 4, female 11 and castrated male showed 4 genes expressed highly in each gender. Further study on the highly up-regulated gene may unfold the mystery of gender specificity found in muscle development. Also, the identification of differentially expressed genes in gender-specific serum will add information on infrastructure of bovine genome research.

• 한국동물학회지
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• 제24권4호
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• pp.189-200
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• 1981

12일간 배양한 계배에서 떼어낸 근모세포에 자외선을 조사하면 근육 분화에 심한 변화를 유발시킬수 있다. 본 연구에서는 자외선이 세포분열 및 근섬유로의 전환, 근모세포와 근섬유의 형태에 미치는 영향을 조사하였다. 자외선을 받은 세포들은 크기가 작아지고 또 적은 수의 세포들이 근섬유 형성에 참여하기 때문에 근섬유의 직경이 좁아지고 길이 또한 작아진다. 자외선이 세포분열과 세포의 융합에 미치는 영향은 배양을 시작한 후 이른 시기에 조사할수록 그 효과가 크다. 또한 자외선의 양을 증가시키면 그 효과가 커져 지나친 양을 조사하면 세포에 치사작용을 나타낸다. 따라서 자외선에 의한 세포 밀도의 감소가 근섬유 형성의 저하를 초래하는 것으로 사료되어 이에 본 연구와 타 실험실에서 얻은 정보를 바탕으로 세포 융합 능력 감소의 원인에 대하여 토의하였다.