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Lu CS, Lee YN, Wang SW, Wu YJ, Su CH, Hsieh CL, Tien TY, Wang BJ, Chen MC, Chen CW, Yeh HI. KC21 Peptide Inhibits Angiogenesis and Attenuates Hypoxia-Induced Retinopathy. J Cardiovasc Transl Res 2019; 12:366-377. [PMID: 30790141 PMCID: PMC6707963 DOI: 10.1007/s12265-019-09865-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 01/20/2019] [Indexed: 12/31/2022]
Abstract
Desmogleins (Dsg2) are the major components of desmosomes. Dsg2 has five extracellular tandem cadherin domains (EC1-EC5) for cell-cell interaction. We had previously confirmed the Dsg2 antibody and its epitope (named KC21) derived from EC2 domain suppressing epithelial-mesenchymal transition and invasion in human cancer cell lines. Here, we screened six peptide fragments derived from EC2 domain and found that KR20, the parental peptide of KC21, was the most potent one on suppressing endothelial colony-forming cell (ECFC) tube-like structure formation. KC21 peptide also attenuated migration but did not disrupt viability and proliferation of ECFCs, consistent with the function to inhibit VEGF-mediated activation of p38 MAPK but not AKT and ERK. Animal studies showed that KC21 peptides suppressed capillary growth in Matrigel implant assay and inhibited oxygen-induced retinal neovascularization. The effects were comparable to bevacizumab (Bev). In conclusion, KC21 peptide is an angiogenic inhibitor potentially useful for treating angiogenesis-related diseases.
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Affiliation(s)
- Chi-Sheng Lu
- Departments of Medical Research, Mackay Memorial Hospital, Taipei, 10449, Taiwan.,Virginia Contract Research Organization Co., Ltd, Taipei, 11491, Taiwan
| | - Yi-Nan Lee
- Departments of Medical Research, Mackay Memorial Hospital, Taipei, 10449, Taiwan
| | - Shin-Wei Wang
- Department of Medicine, Mackay Medical College, New Taipei City, 25245, Taiwan
| | - Yih-Jer Wu
- Departments of Medical Research, Mackay Memorial Hospital, Taipei, 10449, Taiwan.,Department of Medicine, Mackay Medical College, New Taipei City, 25245, Taiwan
| | - Cheng-Huang Su
- Departments of Medical Research, Mackay Memorial Hospital, Taipei, 10449, Taiwan
| | - Chin-Ling Hsieh
- Departments of Medical Research, Mackay Memorial Hospital, Taipei, 10449, Taiwan
| | - Ting Yi Tien
- Departments of Medical Research, Mackay Memorial Hospital, Taipei, 10449, Taiwan
| | - Bo-Jeng Wang
- Department of Medicine, Mackay Medical College, New Taipei City, 25245, Taiwan
| | - Min-Che Chen
- Asclepiumm Taiwan Co., Ltd, New Taipei City, 25160, Taiwan
| | - Chun-Wei Chen
- Asclepiumm Taiwan Co., Ltd, New Taipei City, 25160, Taiwan
| | - Hung-I Yeh
- Departments of Medical Research, Mackay Memorial Hospital, Taipei, 10449, Taiwan. .,Department of Medicine, Mackay Medical College, New Taipei City, 25245, Taiwan. .,Departments of Medical Research and Internal Medicine, Mackay Memorial Hospital, No. 92, Sec. 2, Zhongshan N. Rd, Taipei City, 10449, Taiwan.
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Abstract
A high-expansion core material containing magnesia and forsterite may be used to make all-ceramic dental crowns with porcelain-fused-to-metal body porcelains. The purpose of this study was to investigate the strengthening mechanism for the magnesia core material. Six batches of the magnesia core material were made by reacting magnesia with a silica glass with holding times ranging from 17 to 120 min. The flexural strength was measured using three-point loading according to the ISO specification for dental ceramics. The forsterite content was measured using quantitative x-ray diffraction. A statistically significant correlation was found between the forsterite content and flexural strength. The proposed mechanism for strengthening is the precipitation of fine forsterite crystals in the glass matrix surrounding unreacted magnesia. Longer reaction times produced more dissolution of magnesia and subsequent precipitation of forsterite. This method results in a new strengthening mechanism for dental ceramics which have previously relied on the incorporation of alumina, leucite or ceramic whiskers.
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Affiliation(s)
- W J O'Brien
- Department of Biologic and Materials Science, School of Dentistry, University of Michigan, Ann Arbor
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Abstract
The viability of rare earth ions as fluorescent coloring additives for dental porcelain was investigated. The data presented allow the formulation of porcelain with specific color properties under illumination by ultraviolet light. Attention is drawn to the possibility of energy transfer occurring with the result that prediction of color may not be done by application of the additive color-mixing scheme.
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