1
|
Zang Y, Song JH, Oh SH, Kim JW, Lee MN, Piao X, Yang JW, Kim OS, Kim TS, Kim SH, Koh JT. Targeting NLRP3 Inflammasome Reduces Age-Related Experimental Alveolar Bone Loss. J Dent Res 2020; 99:1287-1295. [PMID: 32531176 DOI: 10.1177/0022034520933533] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The cause of chronic inflammatory periodontitis, which leads to the destruction of periodontal ligament and alveolar bone, is multifactorial. An increasing number of studies have shown the clinical significance of NLRP3-mediated low-grade inflammation in degenerative disorders, but its causal linkage to age-related periodontitis has not yet been elucidated. In this study, we investigated the involvement of the NLRP3 inflammasome and the therapeutic potential of NLRP3 inhibition in age-related alveolar bone loss by using in vivo and in vitro models. The poor quality of alveolar bones in aged mice was correlated with caspase-1 activation by macrophages and elevated levels of IL-1β, which are mainly regulated by the NLRP3 inflammasome, in periodontal ligament and serum, respectively. Aged mice lacking Nlrp3 showed better bone mass than age-matched wild-type mice via a way that affects bone resorption rather than bone formation. In line with this finding, treatment with MCC950, a potent inhibitor of the NLRP3 inflammasome, significantly suppressed alveolar bone loss with reduced caspase-1 activation in aged mice but not in young mice. In addition, our in vitro studies showed that the addition of IL-1β encourages RANKL-induced osteoclastogenesis from bone marrow-derived macrophages and that treatment with MCC950 significantly suppresses osteoclastic differentiation directly, irrelevant to the inhibition of IL-1β production. Our results suggest that the NLRP3 inflammasome is a critical mediator in age-related alveolar bone loss and that targeting the NLRP3 inflammasome could be a novel option for controlling periodontal degenerative changes with age.
Collapse
Affiliation(s)
- Y Zang
- Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.,Hard-tissue Biointerface Research Center, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - J H Song
- Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.,Hard-tissue Biointerface Research Center, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - S H Oh
- Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.,Hard-tissue Biointerface Research Center, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - J W Kim
- Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.,Hard-tissue Biointerface Research Center, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - M N Lee
- Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.,Hard-tissue Biointerface Research Center, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - X Piao
- Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.,Hard-tissue Biointerface Research Center, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - J W Yang
- Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.,Hard-tissue Biointerface Research Center, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - O S Kim
- Hard-tissue Biointerface Research Center, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.,Department of Periodontology, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - T S Kim
- Department of Life Sciences, College of Life Sciences and Biotechnology, Korea University, Seoul, Republic of Korea
| | - S H Kim
- Hard-tissue Biointerface Research Center, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.,Department of Oral Anatomy, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - J T Koh
- Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.,Hard-tissue Biointerface Research Center, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| |
Collapse
|
2
|
Affiliation(s)
- X Piao
- College of Animal Science and Technology, China Agricultural University, Beijing, China (People’s Republic)
| |
Collapse
|
3
|
Kang K, Lee S, Piao X, Byun H, Won M, Park K, Hur G, Lee S. PO-063 Triterpenoids isolated from natural product regulates TNF(tumour necrosis factor)-mediated RIP(receptor-interacting serine/threonine-protein kinase)1-dependent apoptosis. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
4
|
Nishi-Tatsumi M, Yahagi N, Takeuchi Y, Toya N, Takarada A, Murayama Y, Aita Y, Sawada Y, Piao X, Oya Y, Shikama A, Masuda Y, Kubota M, Izumida Y, Matsuzaka T, Nakagawa Y, Sekiya M, Iizuka Y, Kawakami Y, Kadowaki T, Yamada N, Shimano H. A key role of nuclear factor Y in the refeeding response of fatty acid synthase in adipocytes. FEBS Lett 2017; 591:965-978. [PMID: 28281280 DOI: 10.1002/1873-3468.12620] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 03/02/2017] [Accepted: 03/04/2017] [Indexed: 11/10/2022]
Abstract
Fatty acid synthase (Fasn) is a key component of energy metabolism that is dynamically induced by food intake. Although extensive studies have revealed a number of transcription factors involved in the fasting/refeeding transition of Fasn expression in hepatocytes, much less evidence is available for adipocytes. Using the in vivo Ad-luc analytical system, we identified the inverted CCAAT element (ICE) around -100 nucleotides in the Fasn promoter as a critical cis-element for the refeeding response in adipocytes. Electrophoretic mobility shift assays and chromatin immunoprecipitation show that nuclear factor Y (NF-Y) binds to ICE specifically in refeeding states. Notably, the NF-Y binding to ICE is differently regulated between adipocytes and hepatocytes. These findings provide insights into the specific mechanisms controlling energy metabolism in adipocytes.
Collapse
Affiliation(s)
- Makiko Nishi-Tatsumi
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Naoya Yahagi
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Yoshinori Takeuchi
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Naoki Toya
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Ayako Takarada
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Yuki Murayama
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Yuichi Aita
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Yoshikazu Sawada
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Xiaoying Piao
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Yukari Oya
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Akito Shikama
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Yukari Masuda
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Midori Kubota
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Yoshihiko Izumida
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Takashi Matsuzaka
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Yoshimi Nakagawa
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Motohiro Sekiya
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Yoko Iizuka
- Department of Internal Medicine, Graduate School of Medicine, University of Tokyo, Japan
| | - Yasushi Kawakami
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Takashi Kadowaki
- Department of Internal Medicine, Graduate School of Medicine, University of Tokyo, Japan
| | - Nobuhiro Yamada
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Hitoshi Shimano
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| |
Collapse
|
5
|
Takeuchi Y, Yahagi N, Aita Y, Murayama Y, Sawada Y, Piao X, Toya N, Oya Y, Shikama A, Takarada A, Masuda Y, Nishi M, Kubota M, Izumida Y, Yamamoto T, Sekiya M, Matsuzaka T, Nakagawa Y, Urayama O, Kawakami Y, Iizuka Y, Gotoda T, Itaka K, Kataoka K, Nagai R, Kadowaki T, Yamada N, Lu Y, Jain MK, Shimano H. KLF15 Enables Rapid Switching between Lipogenesis and Gluconeogenesis during Fasting. Cell Rep 2016; 16:2373-86. [PMID: 27545894 PMCID: PMC5031553 DOI: 10.1016/j.celrep.2016.07.069] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 07/08/2016] [Accepted: 07/25/2016] [Indexed: 11/17/2022] Open
Abstract
Hepatic lipogenesis is nutritionally regulated (i.e., downregulated during fasting and upregulated during the postprandial state) as an adaptation to the nutritional environment. While alterations in the expression level of the transcription factor SREBP-1c are known to be critical for nutritionally regulated lipogenesis, upstream mechanisms governing Srebf1 expression remain unclear. Here, we show that the fasting-induced transcription factor KLF15, a key regulator of gluconeogenesis, forms a complex with LXR/RXR, specifically on the Srebf1 promoter. This complex recruits the corepressor RIP140 instead of the coactivator SRC1, resulting in reduced Srebf1 and thus downstream lipogenic enzyme expression during the early and euglycemic period of fasting prior to hypoglycemia and PKA activation. Through this mechanism, KLF15 overexpression specifically ameliorates hypertriglyceridemia without affecting LXR-mediated cholesterol metabolism. These findings reveal a key molecular link between glucose and lipid metabolism and have therapeutic implications for the treatment of hyperlipidemia.
Collapse
Affiliation(s)
- Yoshinori Takeuchi
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Naoya Yahagi
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan.
| | - Yuichi Aita
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Yuki Murayama
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Yoshikazu Sawada
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Xiaoying Piao
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Naoki Toya
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Yukari Oya
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Akito Shikama
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Ayako Takarada
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Yukari Masuda
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Makiko Nishi
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Midori Kubota
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Yoshihiko Izumida
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Takashi Yamamoto
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Motohiro Sekiya
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Takashi Matsuzaka
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Yoshimi Nakagawa
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Osamu Urayama
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Yasushi Kawakami
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Yoko Iizuka
- Department of Internal Medicine, Graduate School of Medicine, University of Tokyo, Tokyo 113-8655, Japan
| | - Takanari Gotoda
- Department of Internal Medicine, Graduate School of Medicine, University of Tokyo, Tokyo 113-8655, Japan
| | - Keiji Itaka
- Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, University of Tokyo, Tokyo 113-8655, Japan
| | - Kazunori Kataoka
- Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, University of Tokyo, Tokyo 113-8655, Japan
| | - Ryozo Nagai
- Department of Internal Medicine, Graduate School of Medicine, University of Tokyo, Tokyo 113-8655, Japan
| | - Takashi Kadowaki
- Department of Internal Medicine, Graduate School of Medicine, University of Tokyo, Tokyo 113-8655, Japan
| | - Nobuhiro Yamada
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| | - Yuan Lu
- Case Cardiovascular Research Institute, Cleveland, OH 44106, USA
| | - Mukesh K Jain
- Case Cardiovascular Research Institute, Cleveland, OH 44106, USA
| | - Hitoshi Shimano
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
| |
Collapse
|
6
|
Li J, Xia H, Yao W, Wang T, Li J, Piao X, Thacker P, Wu G, Wang F. Effects of arginine supplementation during early gestation (day 1 to 30) on litter size and plasma metabolites in gilts and sows. J Anim Sci 2016; 93:5291-303. [PMID: 26641049 DOI: 10.2527/jas.2014-8657] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Two experiments were conducted, under typical commercial swine production conditions, to determine effects of dietary arginine supplementation during early gestation on the performance of gilts and sows. In Exp. 1, between d 1 and 30 of gestation, 62 Landrace gilts and 113 sows consumed a corn- and soybean meal-based diet supplemented with 1.3% -arginine HCl or 2.2% -alanine. Total numbers of piglets born ( < 0.05) and born alive ( < 0.01) per litter and litter birth weights of piglets born ( < 0.05) and born alive ( < 0.05) were increased in the arginine group compared with the control. In Exp. 2, 155 multiparous Landrace sows received 1.3% -arginine HCl supplementation between d 1 and 14 (T2; = 41), d 15 and 30 (T3; = 40), or d 1 and 30 (T4; = 37), whereas the control group received 2.2% -alanine supplementation between d 1 and 30 (T1; = 37). Blood samples were randomly obtained from 6 sows per group on d 1, 14, and 28 of gestation to determine plasma concentrations of AA and related metabolites. Total numbers of piglets born ( = 0.084) and born alive ( = 0.080) per litter tended to be higher for sows supplemented with arginine between d 1 and 14 of gestation (T2) than for control sows (T1). Concentrations of arginine and nitric oxide metabolites were greater ( < 0.05) in T4 compared with T1 and T3 on d 14 of gestation and were also greater in T4 compared with T1 and T2 on d 28 of gestation. Plasma concentrations of spermidine ( < 0.001) were increased in T3 and T4 compared with T1 and T2 on d 28. These results indicate that dietary arginine supplementation during early gestation improves the reproductive performance of gilts and sows, possibly via nitric oxide and polyamine-dependent mechanisms.
Collapse
|
7
|
Shikama A, Shinozaki H, Takeuchi Y, Matsuzaka T, Aita Y, Murayama T, Sawada Y, Piao X, Toya N, Oya Y, Takarada A, Masuda Y, Nishi M, Kubota M, Izumida Y, Nakagawa Y, Iwasaki H, Kobayashi K, Yatoh S, Suzuki H, Yagyu H, Kawakami Y, Yamada N, Shimano H, Yahagi N. Identification of human ELOVL5 enhancer regions controlled by SREBP. Biochem Biophys Res Commun 2015; 465:857-63. [PMID: 26321664 DOI: 10.1016/j.bbrc.2015.08.101] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 08/22/2015] [Indexed: 12/22/2022]
Abstract
Fatty acid elongase 5 (ELOVL5) is an enzyme involved in the synthesis of polyunsaturated fatty acids. Sterol Regulatory Element-binding Protein (SREBP)-1 activates ELOVL5 and increases polyunsaturated fatty acid synthesis, which in turn negatively affects SREBP-1 expression. Thus, ELOVL5 has been established as an SREBP-1 target gene and an important component of the negative feedback loop of de novo lipogenesis. However, the human ELOVL5 promoter/enhancer has not been fully analyzed and the location of SREBP biding sites around the ELOVL5 gene has yet to be defined. Here we performed a detailed promoter/enhancer analysis of human ELOVL5 gene, and identified two new SREBP binding sites, one in the 10 kb upstream region and one in the exon 1. These two SRE motifs are conserved among mammals and the mechanism found in the present study by which SREBP activates ELOVL5 is considered to be common in mammals. Through these findings, we clarified the molecular mechanism how SREBP activates ELOVL5, an important regulator of de novo lipogenesis.
Collapse
Affiliation(s)
- Akito Shikama
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Japan
| | - Haruna Shinozaki
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Japan
| | - Yoshinori Takeuchi
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Japan
| | - Takashi Matsuzaka
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Japan
| | - Yuichi Aita
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Japan
| | - Tomoki Murayama
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Japan
| | - Yoshikazu Sawada
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Japan
| | - Xiaoying Piao
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Japan
| | - Naoki Toya
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Japan
| | - Yukari Oya
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Japan
| | - Ayako Takarada
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Japan
| | - Yukari Masuda
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Japan
| | - Makiko Nishi
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Japan
| | - Midori Kubota
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Japan
| | - Yoshihiko Izumida
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Japan
| | - Yoshimi Nakagawa
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Japan
| | - Hitoshi Iwasaki
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Japan
| | - Kazuto Kobayashi
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Japan
| | - Shigeru Yatoh
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Japan
| | - Hiroaki Suzuki
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Japan
| | - Hiroaki Yagyu
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Japan
| | - Yasushi Kawakami
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Japan
| | - Nobuhiro Yamada
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Japan
| | - Hitoshi Shimano
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Japan
| | - Naoya Yahagi
- Nutrigenomics Research Group, Faculty of Medicine, University of Tsukuba, Japan.
| |
Collapse
|
8
|
Han H, Cui M, You X, Chen M, Piao X, Jin G. A role of 1,25(OH)2D3 supplementation in rats with nonalcoholic steatohepatitis induced by choline-deficient diet. Nutr Metab Cardiovasc Dis 2015; 25:556-561. [PMID: 25843661 DOI: 10.1016/j.numecd.2015.02.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 01/29/2015] [Accepted: 02/22/2015] [Indexed: 01/10/2023]
Abstract
BACKGROUND AND AIMS It has been reported that 1,25(OH)2D3 (1,25-VD3) ameliorates the progression of nonalcoholic steatohepatitis (NASH). However, it is unclear whether 1,25-VD3 plays a role in NASH induced by a choline-deficient (CD) diet. In this study, we investigated the roles of 1,25-VD3 in the development and progression of NASH in rats induced by a CD diet. METHODS AND RESULTS Wistar rats with NASH induced by a CD diet were subjected to intraperitoneal injections of 1, 5, or 10 μg/kg of 1,25-VD3 twice weekly for 12 weeks. The administration of 1,25-VD3 decreased free fatty acids (FFAs), triglycerides (TGs), thiobarbituric acid-reactive substances (TBARS), the number of apoptotic cells, and the expression of tissue inhibitor of metalloproteinase-1 (TIMP-1) in the liver, and it improved liver histology, but it did not change the total antioxidant capacity (TAOC) in the liver. Interestingly, the level of CK18-M30 was decreased in the liver of model animals. Treatment with 1,25-VD3 may restrain the downregulation of CK18-M30 in the liver and its release into the bloodstream, thus decreasing the level of serum CK18-M30. 1,25-VD3 supplementation elevated the serum level of 25(OH)D3 and the expression of VDR in the liver. The dose-effect relationship of 1,25-VD3 indicated that 1,25-VD3 slows down the development and progression of NASH induced by a CD diet, but higher doses of 1,25-VD3 may lead to adverse effects. CONCLUSION The results suggest the presence of both antagonistic and adverse dose-dependent effects of the long-term supplementation of 1,25-VD3 on NASH induced by a CD diet.
Collapse
Affiliation(s)
- H Han
- Department of Gastroenterology, Affiliated Hospital of Yanbian University, Yanji, China
| | - M Cui
- Department of Pathology and Cancer Research Center, Yanbian University Medical College, Yanji, China
| | - X You
- Department of Laboratory Medicine, Affiliated Hospital of Yanbian University, Yanji, China
| | - M Chen
- Department of Gastroenterology, Affiliated Hospital of Yanbian University, Yanji, China
| | - X Piao
- Department of Gastroenterology, Affiliated Hospital of Yanbian University, Yanji, China.
| | - G Jin
- Department of Pathology and Cancer Research Center, Yanbian University Medical College, Yanji, China.
| |
Collapse
|
9
|
Nishina T, Komazawa-Sakon S, Yanaka S, Piao X, Zheng DM, Piao JH, Kojima Y, Yamashina S, Sano E, Putoczki T, Doi T, Ueno T, Ezaki J, Ushio H, Ernst M, Tsumoto K, Okumura K, Nakano H. Interleukin-11 Links Oxidative Stress and Compensatory Proliferation. Sci Signal 2012; 5:ra5. [DOI: 10.1126/scisignal.2002056] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
10
|
Shiono M, Kobayashi T, Takahashi R, Sun G, Abe M, Zhang D, Wang L, Piao X, Takagi Y, Mineki R, Taka H, Tada N, Sonobe S, Momose S, Ueda M, Hino O. The G1556S-type tuberin variant suppresses tumor formation in tuberous sclerosis 2 mutant (Eker) rats despite its deficiency in mTOR inhibition. Oncogene 2008; 27:6690-7. [DOI: 10.1038/onc.2008.283] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
11
|
Takagi Y, Kobayashi T, Shiono M, Wang L, Piao X, Sun G, Zhang D, Abe M, Hagiwara Y, Takahashi K, Hino O. Interaction of folliculin (Birt-Hogg-Dubé gene product) with a novel Fnip1-like (FnipL/Fnip2) protein. Oncogene 2008; 27:5339-47. [PMID: 18663353 DOI: 10.1038/onc.2008.261] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Birt-Hogg-Dubé (BHD) syndrome is characterized by the development of pneumothorax, hair folliculomas and renal tumors and the responsible BHD gene is thought to be a tumor suppressor. The function of folliculin (Flcn), encoded by BHD, is totally unknown, although its interaction with Fnip1 has been reported. In this study, we identified a novel protein binding to Flcn, which is highly homologous to Fnip1, and which we named FnipL (recently reported in an independent study as Fnip2). The interaction between FnipL/Fnip2 and Flcn may be mediated mainly by the C-terminal domains of each protein as is the case for the Flcn-Fnip1 interaction. FnipL/Fnip2 and Flcn were located together in the cytoplasm in a reticular pattern, although solely expressed Flcn was found mainly in the nucleus. Cytoplasmic retention of Flcn was canceled with C-terminal truncation of FnipL/Fnip2, suggesting that FnipL/Fnip2 regulates Flcn distribution through their complex formation. By the employment of siRNA, we observed a decrease in S6K1 phosphorylation in the BHD-suppressed cell. We also observed a decrease in S6K1 phosphorylation in FNIP1- and, to a lesser extent, in FNIPL/FNIP2-suppressed cells. These results suggest that Flcn-FnipL/Fnip2 and Flcn-Fnip1 complexes positively regulate S6K1 phosphorylation and that FnipL/Fnip2 provides an important clue to elucidating the function of Flcn and the pathogenesis of BHD.
Collapse
Affiliation(s)
- Y Takagi
- Department of Pathology and Oncology, Juntendo University School of Medicine, Bunkyo-Ku, Tokyo, Japan
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Yan C, Piao X, Wang Y, Li H, Xia G. Effect of mixed oil on C<sub>18</sub> - fatty acid and conjugated
linoleic acid profiles in rumen fluid and blood plasma
of cattle. J Anim Feed Sci 2007. [DOI: 10.22358/jafs/74613/2007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
13
|
Chang BS, Piao X, Giannini C, Cascino GD, Scheffer I, Woods CG, Topcu M, Tezcan K, Bodell A, Leventer RJ, Barkovich AJ, Grant PE, Walsh CA. Bilateral generalized polymicrogyria (BGP): a distinct syndrome of cortical malformation. Neurology 2004; 62:1722-8. [PMID: 15159468 DOI: 10.1212/01.wnl.0000125187.52952.e9] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Syndromes of bilateral symmetric polymicrogyria include an autosomal recessive form of bilateral frontoparietal polymicrogyria (BFPP), in which the malformation is most severe rostrally. The authors describe a new syndrome they have termed "bilateral generalized polymicrogyria" (BGP), in which the malformation occurs in a generalized distribution but is often most severe in the perisylvian regions. METHODS Patients with bilateral polymicrogyria were identified from multiple medical centers worldwide. The diagnosis of BGP was based on findings from conventional spin echo MRI and, in one case, postmortem neuropathologic findings. Genetic analysis was performed for those patients from consanguineous pedigrees and those with multiple affected siblings to rule out linkage to the BFPP locus on chromosome 16q. RESULTS Twelve patients were identified with BGP. Clinical features included cognitive and motor delay as well as seizures. Some specific features characteristic of other known bilateral polymicrogyria syndromes, such as pseudobulbar palsy and dysconjugate gaze, were not commonly seen in these patients. Radiologically, polymicrogyria appeared widespread but was often most severe in the perisylvian regions. Pathologic examination in one case revealed a diffusely thin and excessively folded cerebral cortex lacking normal six-layered architecture. Seven patients subjected to genetic analysis did not demonstrate linkage to the BFPP locus. CONCLUSIONS BGP is a distinct syndrome of cortical malformation. Several features allow BGP to be distinguished from other disorders on the growing list of bilateral symmetric polymicrogyria syndromes.
Collapse
Affiliation(s)
- B S Chang
- Division of Neurogenetics, Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Bennett DC, Trayner ID, Piao X, Easty DJ, Klüppel M, Alexander WS, Wagner EF, Bernstein A. recessive spotting: a linked locus that interacts with W/Kit but is not allelic. Genes Cells 1998; 3:235-44. [PMID: 9663658 DOI: 10.1046/j.1365-2443.1998.00184.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND The murine coat-colour mutation recessive spotting (rs) maps very closely to the W/Kit locus, encoding the proto-oncoprotein Kit, the protein tyrosine kinase receptor for stem cell factor. Kit is important in the development of melanocytes, germ cells, interstitial cells of Cajal (ICC) and haemopoietic lineages, including mast cells. rs has never been genetically separated from Kit, and interacts with Kit mutations, suggesting that it is a recessive allele of Kit. Here we have tested this possibility. We have shown previously that diploid rs/rs melanocytes proliferated more slowly than did +/+ melanocytes, as did an immortal line of rs/rs melanocytes, melan-rs. RESULTS The Kit mRNA level in rs/rs melanocytes was indistinguishable from that of other melanocyte lines. The Kit cDNA sequence from rs/rs melanocytes and the kinase activity of Kit in rs/rs mast cells appeared to be normal. No deficiency of mast cells or ICC was observed in rs/rs mice. Moreover, following the overexpression of a normal Kit cDNA, proliferation of rs/rs melanocytes was retarded further, but that of +/+ melanocytes was increased, indicating an intracellular interaction between rs and Kit. Of other closely linked tyrosine kinase genes, melanocytes and melanoblasts did not express mRNA for Pdgfra, Flk-1 or Txk, but both expressed Tec, encoding a nonreceptor kinase that interacts with Kit. CONCLUSIONS rs is not a mutation in Kit, although we have confirmed that rs interacts with Kit. It seems unlikely that rs affects Pdgfra, Flk-1 or Txk, but Tec remains a candidate for rs.
Collapse
Affiliation(s)
- D C Bennett
- St. George's Hospital Medical School, London, UK.
| | | | | | | | | | | | | | | |
Collapse
|
15
|
Piao X, Paulson R, van der Geer P, Pawson T, Bernstein A. Oncogenic mutation in the Kit receptor tyrosine kinase alters substrate specificity and induces degradation of the protein tyrosine phosphatase SHP-1. Proc Natl Acad Sci U S A 1996; 93:14665-9. [PMID: 8962111 PMCID: PMC26192 DOI: 10.1073/pnas.93.25.14665] [Citation(s) in RCA: 135] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Activating mutations in the Kit receptor tyrosine kinase have been identified in both rodent and human mast cell leukemia. One activating Kit mutation substitutes a valine for aspartic acid at codon 816 (D816V) and is frequently observed in human mastocytosis. Mutation at the equivalent position in the murine c-kit gene, involving a substitution of tyrosine for aspartic acid (D814Y), has been described in the mouse mastocytoma cell line P815. We have investigated the mechanism of oncogenic activation by this mutation. Expression of this mutant Kit receptor tyrosine kinase in a mast cell line led to the selective tyrosine phosphorylation of a 130-kDa protein and the degradation, through the ubiquitin-dependent proteolytic pathway, of a 65-kDa phosphoprotein. The 65-kDa protein was identified as the src homology domain 2 (SH2)-containing protein tyrosine phosphatase SHP-1, a negative regulator of signaling by Kit and other hematopoietic receptors, and the protein product of the murine motheaten locus. This mutation also altered the sites of receptor autophosphorylation and peptide substrate selectivity. Thus, this mutation activates the oncogenic potential of Kit by a novel mechanism involving an alteration in Kit substrate recognition and the degradation of SHP-1, an attenuator of the Kit signaling pathway.
Collapse
Affiliation(s)
- X Piao
- Program in Molecular Biology and Cancer, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, ON Canada
| | | | | | | | | |
Collapse
|
16
|
Piao X, Bernstein A. A point mutation in the catalytic domain of c-kit induces growth factor independence, tumorigenicity, and differentiation of mast cells. Blood 1996; 87:3117-23. [PMID: 8605325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
The murine W and Steel loci encode the Kit receptor tyrosine kinase and its ligand, Steel factor, respectively. Loss of function mutations at either the W or Sl loci lead to a variety of pleiotropic developmental defects, including mast cell deficiency and severe macrocytic anemia. In addition to these loss-of-function mutations, gain-of-function mutations in c-kit, leading to constitutive activation of the Kit receptor, have also been identified in both rodent and human mastocytomas. In this study, we have examined the transforming potential and biologic effects of a point mutation that results in substitution of the aspartic acid at codon 814 in the cytoplasmic kinase domain to tyrosine (D814Y) by introducing either wild-type (Kit) or mutant KitD814Y (KDY) cDNA into an interleukin-3-dependent mast cell line IC2. Stimulation of cells expressing the wild-type Kit receptor (IC2/Kit) with Steel factor in vitro resulted in a short-term growth response, whereas IC2/KDY cells were capable of sustained proliferation in a ligand-independent manner. In addition, expression of KDY resulted in the oncogenic transformation of IC2 cells, as determined by colony formation in vitro in the absence of exogenous growth factors and the formation of mastocytomas in vivo in syngeneic DBA/2 mice. Surprisingly, KDY expression in IC2 cells triggered dramatic changes in cell size and the extent of granulation. In addition, KDY induced the expression of mouse mast cell protease-4 (MMCP-4) and MMCP-6. In contrast, neither of these molecular or cellular changes was observed in IC2/Kit cells treated with Steel factor. These results show that the D814Y mutation in the cytoplasmic kinase domain of the Kit receptor induces ligand-independent mast cell growth in vitro, tumorigenicity in vivo, and mast cell differentiation.
Collapse
Affiliation(s)
- X Piao
- Program in Molecular Biology and Cancer, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | | |
Collapse
|
17
|
Piao X, Curtis JE, Minkin S, Minden MD, Bernstein A. Expression of the Kit and KitA receptor isoforms in human acute myelogenous leukemia. Blood 1994; 83:476-81. [PMID: 7506952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Genetic and biologic evidence suggests that the Kit receptor tyrosine kinase is important in early events in hematopoietic stem cell differentiation. Two naturally occurring isoforms of the Kit receptor, termed Kit and KitA, were originally described in mouse cells and, subsequently, in human cells. These isoforms differ by the presence (KitA) or absence (Kit) of four amino acids (Gly-Asn-Asn-Lys) that lie immediately outside the transmembrane domain. RNase protection was used to measure the levels of Kit and KitA mRNA in normal bone marrow and the blast cells from individuals with acute myelogenous leukemia (AML). Although both isoforms were present in all the AML samples tested, there was considerable heterogeneity in the relative levels of the two transcripts, with Kit to KitA RNA ratios varying from as low as 1.3 to as high as 12. In contrast, the ratio of Kit to KitA transcripts in normal bone marrow was tightly clustered between 4.4 and 5.5. Because alterations in the relative levels of expression of Kit and KitA may affect the ability of a cell to respond to the Kit ligand, Steel factor, we examined the Kit/KitA RNA ratio in AML patients that differed with respect to a number of diagnostic, prognostic, and biologic parameters. The relative levels of Kit to KitA RNA was independent of French-American-British subtype, response to therapy, and primary and secondary plating efficiencies in vitro. Thus, these data suggest that the relative levels of the two isoforms of the Kit receptor in AML are not associated with any obvious biologic or clinical parameters and, therefore, may reflect naturally occurring changes in splicing mechanisms as stem cells differentiate.
Collapse
Affiliation(s)
- X Piao
- Division of Molecular and Developmental Biology, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | | | | | | | | |
Collapse
|