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Hu L, Tan J, Yang X, Tan H, Xu X, You M, Qin W, Huang L, Li S, Mo M, Wei H, Li J, Tan J. Polysaccharide Extracted from Laminaria japonica Delays Intrinsic Skin Aging in Mice. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2016; 2016:5137386. [PMID: 27143987 PMCID: PMC4837268 DOI: 10.1155/2016/5137386] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/03/2016] [Revised: 03/06/2016] [Accepted: 03/09/2016] [Indexed: 12/15/2022]
Abstract
This study aimed to determine the effect of topically applied Laminaria polysaccharide (LP) on skin aging. We applied ointment containing LP (10, 25, and 50 μg/g) or vitamin E (10 μg/g) to the dorsal skin of aging mice for 12 months and young control mice for 4 weeks. Electron microscopy analysis of skin samples revealed that LP increased dermal thickness and skin collagen content. Tissue inhibitor of metalloprotease- (TIMP-) 1 expression was upregulated while that of matrix metalloproteinase- (MMP-) 1 was downregulated in skin tissue of LP-treated as compared to untreated aging mice. Additionally, phosphorylation of c-Jun N-terminal kinase (JNK) and p38 was higher in aging skin than in young skin, while LP treatment suppressed phospho-JNK expression. LP application also enhanced the expression of antioxidative enzymes in skin tissue, causing a decrease in malondialdehyde levels and increases in superoxide dismutase, catalase, and glutathione peroxidase levels relative to those in untreated aging mice. These results indicate that LP inhibits MMP-1 expression by preventing oxidative stress and JNK phosphorylation, thereby delaying skin collagen breakdown during aging.
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Affiliation(s)
- Longyuan Hu
- Department of Physiology, Guangxi Medical University, Nanning 530021, China
- Center of Translational Medicine, Guangxi Medical University, Nanning 530021, China
| | - Jia Tan
- First Clinical Medical College, Guangzhou Medical University, Guangzhou 511436, China
| | - Xiaomei Yang
- Department of Physiology, Guangxi Medical University, Nanning 530021, China
| | - Haitao Tan
- Eighth Affiliated Hospital, Guangxi Medical University, Guigang 530007, China
| | - Xiaozhen Xu
- Center of Translational Medicine, Guangxi Medical University, Nanning 530021, China
| | - Manhang You
- Department of Physiology, Guangxi Medical University, Nanning 530021, China
| | - Wu Qin
- Department of Physiology, Guangxi Medical University, Nanning 530021, China
| | - Liangzhao Huang
- Department of Physiology, Guangxi Medical University, Nanning 530021, China
| | - Siqi Li
- Department of Physiology, Guangxi Medical University, Nanning 530021, China
| | - Manqiu Mo
- Department of Physiology, Guangxi Medical University, Nanning 530021, China
| | - Huifen Wei
- Department of Physiology, Guangxi Medical University, Nanning 530021, China
| | - Jing Li
- Department of Physiology, Guangxi Medical University, Nanning 530021, China
- Center of Translational Medicine, Guangxi Medical University, Nanning 530021, China
| | - Jiyong Tan
- Department of Physiology, Guangxi Medical University, Nanning 530021, China
- Center of Translational Medicine, Guangxi Medical University, Nanning 530021, China
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Nagashima H. Rubratoxin-B-induced secretion of chemokine ligands of cysteine-cysteine motif chemokine receptor 5 (CCR5) and its dependence on heat shock protein 90 in HL60 cells. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2015; 40:997-1000. [PMID: 26595743 DOI: 10.1016/j.etap.2015.10.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 10/19/2015] [Accepted: 10/29/2015] [Indexed: 06/05/2023]
Abstract
To elucidate the mechanism underlying rubratoxin B toxicity, the effects of rubratoxin B on the secretion of CCR5 chemokines, CCL3, CCL4, and CCL5, in a human promyelocytic leukemia cell line, HL60, were investigated. In addition, to examine whether the molecular chaperone 90-kDa heat shock protein (Hsp90) contributes to rubratoxin B toxicity, the effects of Hsp90-specific inhibitors, radicicol and geldanamycin, were investigated. Exposure to rubratoxin B for 24h induced secretion of each CCR5 chemokine, although the effect on CCL5 secretion was modest, and it enhanced secretion of proinflammatory cytokines tumor necrosis factor-α, CXCL8, and CCL2. Concomitant treatment with radicicol abolished the rubratoxin-induced secretion of all cytokines investigated. Geldanamycin antagonized the rubratoxin B-induced effects on CCL3 and CCL5, but not CCL4; the effects of geldanamycin were less than that of radicicol. Taken together, the results suggest that rubratoxin B, with the contribution of Hsp90, induces secretion of CCR5 chemokines.
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Affiliation(s)
- Hitoshi Nagashima
- National Food Research Institute, National Agriculture and Food Research Organization, 2-1-12 Kannondai, Tsukuba, Ibaraki 305-8642, Japan.
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Iwashita K, Nagashima H. Rubratoxin B induces signs of fatty acid oxidation disorders (FAODs) in mice. Toxicol Lett 2011; 206:238-43. [DOI: 10.1016/j.toxlet.2011.07.027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2011] [Revised: 07/25/2011] [Accepted: 07/25/2011] [Indexed: 12/18/2022]
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Wada SI, Usami I, Umezawa Y, Inoue H, Ohba SI, Someno T, Kawada M, Ikeda D. Rubratoxin A specifically and potently inhibits protein phosphatase 2A and suppresses cancer metastasis. Cancer Sci 2010; 101:743-50. [PMID: 20028386 PMCID: PMC11158319 DOI: 10.1111/j.1349-7006.2009.01438.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Although cytostatin analog protein phosphatase 2A (PP2A)-specific inhibitors are promising candidates of a new type of anticancer drug, their development has been hindered because of their liability. To find new classes of PP2A-specific inhibitors, we conducted a screening with microbial metabolites and found that rubratoxin A, a classical mycotoxin, is a highly specific and potent inhibitor of the enzyme. While rubratoxin A inhibits PP2A at Ki = 28.7 nm, it hardly inhibited any other phosphatases examined. Rubratoxin B, a close analog, also specifically but weakly inhibits PP2A at Ki = 3.1 microM. The inhibition of intracellular PP2A in cultured cells is obviously observed with 20 microM rubratoxin A treatment for 3 h, inducing the overphosphorylation in PP2A substrate proteins. Although rubratoxins and cytostatin differ in the apparent structures, these compounds share similarities in the structures in detail and PP2A-binding manners. Rubratoxin A showed higher suppression of tumor metastasis and reduction of the primary tumor volume than cytostatin in mouse experiments. As a successor of cytostatin analogs, rubratoxin A should be a good compound leading to the development of antitumor drugs targeting PP2A.
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Affiliation(s)
- Shun-ichi Wada
- Numazu Bio-Medical Research Institute, Microbial Chemistry Research Foundation, Shizuoka
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Muller PY, Dieterle F. Tissue-specific, non-invasive toxicity biomarkers: translation from preclinical safety assessment to clinical safety monitoring. Expert Opin Drug Metab Toxicol 2009; 5:1023-38. [DOI: 10.1517/17425250903114174] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Nagashima H, Maeda-Nakamura K, Iwashita K, Goto T. Induced secretion of insulin-like growth factor binding protein-1 (IGFBP-1) in human hepatoma cell HepG2 by rubratoxin B. Arch Toxicol 2006; 81:347-51. [PMID: 17109117 DOI: 10.1007/s00204-006-0162-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2006] [Accepted: 10/25/2006] [Indexed: 10/23/2022]
Abstract
The induction of insulin-like growth factor binding protein-1 (IGFBP-1) secretion by rubratoxin B was investigated using human hepatoma cell line HepG2; we also documented the involvement of stress-activated MAP kinases [c-Jun-N-terminal kinases (JNKs) and p38s] in this process. Rubratoxin B dramatically enhanced IGFBP-1 secretion, which peaked at a concentration of 40 microg/ml. The amount of IGFBP-1 mRNA increased with time and plateaued at 6 h. Compared with the amounts of IGFBP-1 secreted, the induction ratios of transcription were much smaller, indicating that IGFBP-1 secretion is regulated chiefly post-transcriptionally. The result of concomitant treatment with rubratoxin B and JNK inhibitor indicated that JNKs do not affect rubratoxin B-induced IGFBP-1 secretion. Alternatively, rubratoxin B-associated induction of IGFBP-1 secretion was marked in the absence of p38 inhibitor but attenuated in its presence. Therefore, p38s appear to stimulate rubratoxin B-induced IGFBP-1 secretion. Treatment with p38 inhibitor slightly increased the amount of rubratoxin B-induced IGFBP-1 mRNA. However this induction ratio was smaller than that of rubratoxin B-induced secretion, suggesting that p38s regulate IGFBP-1 secretion both transcriptionally and post-transcriptionally. In this study, we showed that rubratoxin B induces IGFBP-1 levels in HepG2 cells and p38s contribute to this process.
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Affiliation(s)
- Hitoshi Nagashima
- National Agriculture and Food Research Organization, National Food Research Institute, 2-1-12 Kannondai, Tsukuba, Ibaraki, Japan.
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