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Sato D, Yamahama Y, Koyama R, Mase K, Sawada H. Molecular Characterization and Tissue Distribution of Calcineurin Regulatory B Subunit during the Prevention of Diapause in the Silkworm, Bombyx mori. Zoolog Sci 2021; 38:305-310. [PMID: 34342950 DOI: 10.2108/zs200147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 03/16/2021] [Indexed: 11/17/2022]
Abstract
To clarify the molecular mechanism of prevention of entry into diapause in Bombyx mori by HCl treatment, we biochemically analyzed calcineurin regulatory B subunit (CNB) in diapause eggs treated with HCl solution. Our previous studies revealed that HCl treatment causes Ca2+ to efflux from diapause eggs. Therefore, we attempted to analyze CNB, which is known to associate with Ca2+. The gene expression level of CNB was increased by HCl treatment and the changes of the gene expression were almost the same as that in the non-diapause eggs. As for diapause eggs, almost no gene expression of CNB was confirmed except just after oviposition. In the assay for phosphorylation by protein kinase CK2, recombinant CNB (rCNB) was phosphorylated in vitro. Additionally, a Ca2+ binding assay indicated that rCNB shows affinity for Ca2+. The distribution of CNB was investigated with an immunohistochemical technique using antiserum against rCNB in diapause eggs and HCl-treated diapause eggs. CNB was localized in serosa cells and yolk cells in both eggs. These data may suggest that CNB is activated by intracellular Ca2+ or efflux Ca2+ resulting from HCl treatment, and that it plays a role in the molecular mechanisms of artificial diapause prevention or the breaking of diapause in the silkworm.
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Affiliation(s)
- Daigo Sato
- Department of Biosciences, College of Humanities and Sciences, Nihon University, Setagaya-ku, Tokyo 156-8550, Japan
| | - Yumi Yamahama
- Department of Biology, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan
| | - Rimi Koyama
- Department of Biosciences, College of Humanities and Sciences, Nihon University, Setagaya-ku, Tokyo 156-8550, Japan
| | - Keisuke Mase
- Department of Biosciences, College of Humanities and Sciences, Nihon University, Setagaya-ku, Tokyo 156-8550, Japan
| | - Hiroshi Sawada
- Department of Biosciences, College of Humanities and Sciences, Nihon University, Setagaya-ku, Tokyo 156-8550, Japan,
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Song Y, Tang Y, Yang Q, Li T, He Z, Wu Y, He Q, Li T, Li C, Long M, Chen J, Wei J, Bao J, Shen Z, Meng X, Pan G, Zhou Z. Proliferation characteristics of the intracellular microsporidian pathogen Nosema bombycis in congenitally infected embryos. J Invertebr Pathol 2019; 169:107310. [PMID: 31862268 DOI: 10.1016/j.jip.2019.107310] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 12/14/2019] [Accepted: 12/14/2019] [Indexed: 12/18/2022]
Abstract
Nosema bombycis is an obligate intracellular pathogen that can be transmitted vertically from infected females to eggs, resulting in congenital infections in embryos. Here we investigated the proliferation characteristics of N. bombycis in silkworm embryos using a histopathological approach and deep RNA sequencing. We found that N. bombycis proliferated mainly around yolk granules at the early stage of the embryonic development, 1-2 days post oviposition (dpo). At 4-6 dpo, a portion of N. bombycis in different stages adjacent to the embryo were packaged into the newly formed intestinal lumen, while the remaining parasites continued to proliferate around yolk granules. In the newly hatched larvae (9 dpo), the newly formed spores accumulated in the gut lumen and immediately were released into the environment via the faeces. Transcriptional profiling of N. bombycis further confirmed multiplication of N. bombycis throughout every stage of embryonic development. Additionally, the increased transcriptional level of spore wall proteins and polar tube proteins from 4 dpo indicated an active formation of mature spores. Taken together, our results have provided a characterization of the proliferation of this intracellular microsporidian pathogen in congenitally infected embryos leading to vertical transmission.
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Affiliation(s)
- Yue Song
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China
| | - Yunlin Tang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China
| | - Qiong Yang
- Sericulture and Agri-food Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, China
| | - Tangxin Li
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China
| | - Zhangshuai He
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China
| | - Yujiao Wu
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China
| | - Qiang He
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China
| | - Tian Li
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China
| | - Chunfeng Li
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China
| | - Mengxian Long
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China
| | - Jie Chen
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China
| | - Junhong Wei
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China
| | - Jialing Bao
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China
| | - Zigang Shen
- Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China
| | - Xianzhi Meng
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China
| | - Guoqing Pan
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China.
| | - Zeyang Zhou
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, China; College of Life Sciences, Chongqing Normal University, Chongqing, China; Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture, College of Biotechnology, Southwest University, Chongqing, China.
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