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Eidet JR, Reppe S, Pasovic L, Olstad OK, Lyberg T, Khan AZ, Fostad IG, Chen DF, Utheim TP. The Silk-protein Sericin Induces Rapid Melanization of Cultured Primary Human Retinal Pigment Epithelial Cells by Activating the NF-κB Pathway. Sci Rep 2016; 6:22671. [PMID: 26940175 PMCID: PMC4778122 DOI: 10.1038/srep22671] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 02/17/2016] [Indexed: 12/21/2022] Open
Abstract
Restoration of the retinal pigment epithelial (RPE) cells to prevent further loss of vision in patients with age-related macular degeneration represents a promising novel treatment modality. Development of RPE transplants, however, requires up to 3 months of cell differentiation. We explored whether the silk protein sericin can induce maturation of primary human retinal pigment epithelial (hRPE) cells. Microarray analysis demonstrated that sericin up-regulated RPE-associated transcripts (RPE65 and CRALBP). Upstream analysis identified the NF-κB pathway as one of the top sericin-induced regulators. ELISA confirmed that sericin stimulates the main NF-κB pathway. Increased levels of RPE-associated proteins (RPE65 and the pigment melanin) in the sericin-supplemented cultures were confirmed by western blot, spectrophotometry and transmission electron microscopy. Sericin also increased cell density and reduced cell death following serum starvation in culture. Inclusion of NF-κB agonists and antagonists in the culture medium showed that activation of the NF-κB pathway appears to be necessary, but not sufficient, for sericin-induced RPE pigmentation. We conclude that sericin promotes pigmentation of cultured primary hRPE cells by activating the main NF-κB pathway. Sericin’s potential role in culture protocols for rapid differentiation of hRPE cells derived from embryonic or induced pluripotent stem cells should be investigated.
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Affiliation(s)
- J R Eidet
- Department of Ophthalmology, Oslo University Hospital, Oslo, Norway
| | - S Reppe
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - L Pasovic
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway.,Faculty of Medicine, University of Oslo, Oslo, Norway
| | - O K Olstad
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - T Lyberg
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - A Z Khan
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway.,Faculty of Medicine, University of Oslo, Oslo, Norway
| | - I G Fostad
- Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway
| | - D F Chen
- Schepens Eye Research Institute, Harvard Medical School/Massachusetts Eye and Ear, Boston, MA
| | - T P Utheim
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway.,Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway
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Goto T, Yamaza T, Kido MA, Takana T. Substance P Activates Osteoclast Formation and Osteoclastic Bone Resorption through the Neurokinin-1 Receptor. Acta Histochem Cytochem 2001. [DOI: 10.1267/ahc.34.31] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Tetsuya Goto
- Laboratory of Oral Anatomy and Cell Biology, Graduate School of Dental Science, Kyushu University
| | - Takayoshi Yamaza
- Laboratory of Endodontology and Operative Dentistry, Graduate School of Dental Science, Kyushu University
| | - Mizuho A. Kido
- Laboratory of Oral Anatomy and Cell Biology, Graduate School of Dental Science, Kyushu University
| | - Teruo Takana
- Laboratory of Oral Anatomy and Cell Biology, Graduate School of Dental Science, Kyushu University
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