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Yamamoto N, Takeda S, Hatsusaka N, Hiramatsu N, Nagai N, Deguchi S, Nakazawa Y, Takata T, Kodera S, Hirata A, Kubo E, Sasaki H. Effect of a Lens Protein in Low-Temperature Culture of Novel Immortalized Human Lens Epithelial Cells (iHLEC-NY2). Cells 2020; 9:cells9122670. [PMID: 33322631 PMCID: PMC7764252 DOI: 10.3390/cells9122670] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 11/27/2020] [Accepted: 12/11/2020] [Indexed: 11/24/2022] Open
Abstract
The prevalence of nuclear cataracts was observed to be significantly higher among residents of tropical and subtropical regions compared to those of temperate and subarctic regions. We hypothesized that elevated environmental temperatures may pose a risk of nuclear cataract development. The results of our in silico simulation revealed that in temperate and tropical regions, the human lens temperature ranges from 35.0 °C to 37.5 °C depending on the environmental temperature. The medium temperature changes during the replacement regularly in the cell culture experiment were carefully monitored using a sensor connected to a thermometer and showed a decrease of 1.9 °C, 3.0 °C, 1.7 °C, and 0.1 °C, after 5 min when setting the temperature of the heat plate device at 35.0 °C, 37.5 °C, 40.0 °C, and 42.5 °C, respectively. In the newly created immortalized human lens epithelial cell line clone NY2 (iHLEC-NY2), the amounts of RNA synthesis of αA crystallin, protein expression, and amyloid β (Aβ)1-40 secreted into the medium were increased at the culture temperature of 37.5 °C compared to 35.0 °C. In short-term culture experiments, the secretion of Aβ1-40 observed in cataracts was increased at 37.5 °C compared to 35.0 °C, suggesting that the long-term exposure to a high-temperature environment may increase the risk of cataracts.
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Affiliation(s)
- Naoki Yamamoto
- Department of Ophthalmology, Kanazawa Medical University, Ishikawa 920-0293, Japan; (N.Y.); (S.T.); (N.H.); (E.K.)
- Research Promotion and Support Headquarters, Fujita Health University, Aichi 470-1192, Japan;
| | - Shun Takeda
- Department of Ophthalmology, Kanazawa Medical University, Ishikawa 920-0293, Japan; (N.Y.); (S.T.); (N.H.); (E.K.)
| | - Natsuko Hatsusaka
- Department of Ophthalmology, Kanazawa Medical University, Ishikawa 920-0293, Japan; (N.Y.); (S.T.); (N.H.); (E.K.)
| | - Noriko Hiramatsu
- Research Promotion and Support Headquarters, Fujita Health University, Aichi 470-1192, Japan;
| | - Noriaki Nagai
- Faculty of Pharmacy, Kindai University, Osaka 577-8502, Japan; (N.N.); (S.D.)
| | - Saori Deguchi
- Faculty of Pharmacy, Kindai University, Osaka 577-8502, Japan; (N.N.); (S.D.)
| | - Yosuke Nakazawa
- Division of Hygienic Chemistry, Faculty of Pharmacy, Keio University, Tokyo 105-8512, Japan;
| | - Takumi Takata
- Radiation Biochemistry, Division of Radiation Life Science, Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka 590-0494, Japan;
| | - Sachiko Kodera
- Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Aichi 466-8555, Japan; (S.K.); (A.H.)
| | - Akimasa Hirata
- Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Aichi 466-8555, Japan; (S.K.); (A.H.)
- Center of Biomedical Physics and Information Technology, Nagoya Institute of Technology, Aichi 466-8555, Japan
| | - Eri Kubo
- Department of Ophthalmology, Kanazawa Medical University, Ishikawa 920-0293, Japan; (N.Y.); (S.T.); (N.H.); (E.K.)
| | - Hiroshi Sasaki
- Department of Ophthalmology, Kanazawa Medical University, Ishikawa 920-0293, Japan; (N.Y.); (S.T.); (N.H.); (E.K.)
- Correspondence: ; Tel.: +81-762-286-2211
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