Experimental Study of Warburg Effect in Keloid Nodules: Implication for Downregulation of miR-133b

Background: A keloid is composed of several nodules, which are divided into two zones: the central zone (CZ; a hypoxic region) and the marginal zone (MZ; a normoxic region). Keloid nodules play a key role in energy metabolic activity for continuous growth by increasing in number and total area. In t...

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Published inPlastic and reconstructive surgery. Global open Vol. 11; no. 8; p. e5202
Main Authors Lee, Yuumi, Ito, Yuko, Taniguchi, Kohei, Nuri, Takashi, Lee, SangWoong, Ueda, Koichi
Format Journal Article
LanguageEnglish
Published Hagerstown, MD Lippincott Williams & Wilkins 01.08.2023
Wolters Kluwer
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Abstract Background: A keloid is composed of several nodules, which are divided into two zones: the central zone (CZ; a hypoxic region) and the marginal zone (MZ; a normoxic region). Keloid nodules play a key role in energy metabolic activity for continuous growth by increasing in number and total area. In this study, we aimed to investigate the roles of the zones in the execution of the Warburg effect and identify which microRNAs regulate this phenomenon in keloid tissue. Methods: Eleven keloids from patients were used. Using immunohistochemical analysis, 179 nodules were randomly chosen from these keloids to identify glycolytic enzymes, autophagic markers, pyruvate kinase M (PKM) 1/2, and polypyrimidine tract binding protein 1 (PTBP1). Western blot and qRT-PCR tests were also performed for PKM, PTBP1, and microRNAs (miR-133b and miR-200b, c). Results: Immunohistochemical analysis showed that the expression of the autophagic (LC3, p62) and glycolytic (GLUT1, HK2) were significantly higher in the CZ than in the MZ. PKM2 expression was significantly higher than PKM1 expression in keloid nodules. Furthermore, PKM2 expression was higher in the CZ than in the MZ. However, PKM1 and PTBP1 expression levels were higher in the MZ than in the CZ. The qRT-PCR analysis showed that miR-133b-3p was moderately downregulated in the keloids compared with its expression in the normal skin tissue. Conclusions: The Warburg effect occurred individually in nodules. The MZ presented PKM2-positive fibroblasts produced by activated PTBP1. In the CZ, PKM2-positive fibroblasts produced lactate. MiR-133b-3p was predicted to control the Warburg effect in keloids.
AbstractList Background:. A keloid is composed of several nodules, which are divided into two zones: the central zone (CZ; a hypoxic region) and the marginal zone (MZ; a normoxic region). Keloid nodules play a key role in energy metabolic activity for continuous growth by increasing in number and total area. In this study, we aimed to investigate the roles of the zones in the execution of the Warburg effect and identify which microRNAs regulate this phenomenon in keloid tissue. Methods:. Eleven keloids from patients were used. Using immunohistochemical analysis, 179 nodules were randomly chosen from these keloids to identify glycolytic enzymes, autophagic markers, pyruvate kinase M (PKM) 1/2, and polypyrimidine tract binding protein 1 (PTBP1). Western blot and qRT-PCR tests were also performed for PKM, PTBP1, and microRNAs (miR-133b and miR-200b, c). Results:. Immunohistochemical analysis showed that the expression of the autophagic (LC3, p62) and glycolytic (GLUT1, HK2) were significantly higher in the CZ than in the MZ. PKM2 expression was significantly higher than PKM1 expression in keloid nodules. Furthermore, PKM2 expression was higher in the CZ than in the MZ. However, PKM1 and PTBP1 expression levels were higher in the MZ than in the CZ. The qRT-PCR analysis showed that miR-133b-3p was moderately downregulated in the keloids compared with its expression in the normal skin tissue. Conclusions:. The Warburg effect occurred individually in nodules. The MZ presented PKM2-positive fibroblasts produced by activated PTBP1. In the CZ, PKM2-positive fibroblasts produced lactate. MiR-133b-3p was predicted to control the Warburg effect in keloids.
BackgroundA keloid is composed of several nodules, which are divided into two zones: the central zone (CZ; a hypoxic region) and the marginal zone (MZ; a normoxic region). Keloid nodules play a key role in energy metabolic activity for continuous growth by increasing in number and total area. In this study, we aimed to investigate the roles of the zones in the execution of the Warburg effect and identify which microRNAs regulate this phenomenon in keloid tissue. MethodsEleven keloids from patients were used. Using immunohistochemical analysis, 179 nodules were randomly chosen from these keloids to identify glycolytic enzymes, autophagic markers, pyruvate kinase M (PKM) 1/2, and polypyrimidine tract binding protein 1 (PTBP1). Western blot and qRT-PCR tests were also performed for PKM, PTBP1, and microRNAs (miR-133b and miR-200b, c). ResultsImmunohistochemical analysis showed that the expression of the autophagic (LC3, p62) and glycolytic (GLUT1, HK2) were significantly higher in the CZ than in the MZ. PKM2 expression was significantly higher than PKM1 expression in keloid nodules. Furthermore, PKM2 expression was higher in the CZ than in the MZ. However, PKM1 and PTBP1 expression levels were higher in the MZ than in the CZ. The qRT-PCR analysis showed that miR-133b-3p was moderately downregulated in the keloids compared with its expression in the normal skin tissue. ConclusionsThe Warburg effect occurred individually in nodules. The MZ presented PKM2-positive fibroblasts produced by activated PTBP1. In the CZ, PKM2-positive fibroblasts produced lactate. MiR-133b-3p was predicted to control the Warburg effect in keloids.
Background: A keloid is composed of several nodules, which are divided into two zones: the central zone (CZ; a hypoxic region) and the marginal zone (MZ; a normoxic region). Keloid nodules play a key role in energy metabolic activity for continuous growth by increasing in number and total area. In this study, we aimed to investigate the roles of the zones in the execution of the Warburg effect and identify which microRNAs regulate this phenomenon in keloid tissue. Methods: Eleven keloids from patients were used. Using immunohistochemical analysis, 179 nodules were randomly chosen from these keloids to identify glycolytic enzymes, autophagic markers, pyruvate kinase M (PKM) 1/2, and polypyrimidine tract binding protein 1 (PTBP1). Western blot and qRT-PCR tests were also performed for PKM, PTBP1, and microRNAs (miR-133b and miR-200b, c). Results: Immunohistochemical analysis showed that the expression of the autophagic (LC3, p62) and glycolytic (GLUT1, HK2) were significantly higher in the CZ than in the MZ. PKM2 expression was significantly higher than PKM1 expression in keloid nodules. Furthermore, PKM2 expression was higher in the CZ than in the MZ. However, PKM1 and PTBP1 expression levels were higher in the MZ than in the CZ. The qRT-PCR analysis showed that miR-133b-3p was moderately downregulated in the keloids compared with its expression in the normal skin tissue. Conclusions: The Warburg effect occurred individually in nodules. The MZ presented PKM2-positive fibroblasts produced by activated PTBP1. In the CZ, PKM2-positive fibroblasts produced lactate. MiR-133b-3p was predicted to control the Warburg effect in keloids.
Author Nuri, Takashi
Ueda, Koichi
Ito, Yuko
Lee, Yuumi
Lee, SangWoong
Taniguchi, Kohei
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Snippet Background: A keloid is composed of several nodules, which are divided into two zones: the central zone (CZ; a hypoxic region) and the marginal zone (MZ; a...
BackgroundA keloid is composed of several nodules, which are divided into two zones: the central zone (CZ; a hypoxic region) and the marginal zone (MZ; a...
Background:. A keloid is composed of several nodules, which are divided into two zones: the central zone (CZ; a hypoxic region) and the marginal zone (MZ; a...
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Title Experimental Study of Warburg Effect in Keloid Nodules: Implication for Downregulation of miR-133b
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Volume 11
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