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Dai TM, Qiu JF, Luo C, Cui WZ, Liu K, Li JL, Peng R, Sima YH, Xu SQ. The circadian clock affects starvation resistance through the pentose phosphate pathway in silkworm, Bombyx mori. INSECT SCIENCE 2024. [PMID: 38769889 DOI: 10.1111/1744-7917.13381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 04/14/2024] [Accepted: 04/24/2024] [Indexed: 05/22/2024]
Abstract
Disruption of the circadian clock can affect starvation resistance, but the molecular mechanism is still unclear. Here, we found that starvation resistance was significantly reduced in the core gene BmPer deficient mutant silkworms (Per-/-), but the mutant's starvation resistance increased with larval age. Under natural physiological conditions, the weight of mutant 5th instar larvae was significantly increased compared to wild type, and the accumulation ability of triglycerides and glycogen in the fat bodies was upregulated. However, under starvation conditions, the weight consumption of mutant larvae was increased and cholesterol utilization was intensified. Transcriptome analysis showed that beta-oxidation was significantly upregulated under starvation conditions, fatty acid synthesis was inhibited, and the expression levels of genes related to mitochondrial function were significantly changed. Further investigations revealed that the redox balance, which is closely related to mitochondrial metabolism, was altered in the fat bodies, the antioxidant level was increased, and the pentose phosphate pathway, the source of reducing power in cells, was activated. Our findings suggest that one of the reasons for the increased energy burden observed in mutants is the need to maintain a more robust redox balance in metabolic tissues. This necessitates the diversion of more glucose into the pentose phosphate pathway to ensure an adequate supply of reducing power.
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Affiliation(s)
- Tai-Ming Dai
- School of Life Sciences, Suzhou Medical College of Soochow University, Suzhou, Jiangsu Province, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, Jiangsu Province, China
| | - Jian-Feng Qiu
- School of Life Sciences, Suzhou Medical College of Soochow University, Suzhou, Jiangsu Province, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, Jiangsu Province, China
| | - Cheng Luo
- School of Life Sciences, Suzhou Medical College of Soochow University, Suzhou, Jiangsu Province, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, Jiangsu Province, China
| | - Wen-Zhao Cui
- School of Life Sciences, Suzhou Medical College of Soochow University, Suzhou, Jiangsu Province, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, Jiangsu Province, China
| | - Kai Liu
- School of Life Sciences, Suzhou Medical College of Soochow University, Suzhou, Jiangsu Province, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, Jiangsu Province, China
| | - Jiang-Lan Li
- School of Life Sciences, Suzhou Medical College of Soochow University, Suzhou, Jiangsu Province, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, Jiangsu Province, China
| | - Ruji Peng
- School of Life Sciences, Suzhou Medical College of Soochow University, Suzhou, Jiangsu Province, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, Jiangsu Province, China
| | - Yang-Hu Sima
- School of Life Sciences, Suzhou Medical College of Soochow University, Suzhou, Jiangsu Province, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, Jiangsu Province, China
| | - Shi-Qing Xu
- School of Life Sciences, Suzhou Medical College of Soochow University, Suzhou, Jiangsu Province, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, Jiangsu Province, China
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Yuan XN, Luo C, Zhao QF, Zhong SY, Hang Q, Dai TM, Pan ZH, Sima YH, Qiu JF, Xu SQ. The clock gene Cryptochrome 1 is involved in the photoresponse of embryonic hatching behavior in Bombyx mori. ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 2023; 114:e22046. [PMID: 37583246 DOI: 10.1002/arch.22046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 08/01/2023] [Accepted: 08/02/2023] [Indexed: 08/17/2023]
Abstract
The hatching of insect eggs is a classic circadian behavior rhythm controlled by the biological clock. Its function is considered to impose a daily rhythm on the embryo, allowing it to hatch within a permissible time window. However, the molecular pathways through which the clock affects embryonic hatching behavior remain unclear. Here, we utilized a clock gene Cryptochrome1 (Cry1) knockout mutant to dissect the pathways by which the circadian clock affects embryonic hatching rhythm in the silkworm. In the Cry1 mutant, the embryo hatching rhythm was disrupted. Under the constant light or constant dark incubation conditions, mutant embryos lost their hatching rhythm, while wild-type embryos hatch exhibiting free-running rhythm. In the light-dark cycle (LD), the hatching rhythm of CRY1-deficient silkworms could not be entrained by the LD photoperiod during the incubation period. The messenger RNA levels and enzymatic activities of Cht and Hel in the mutant embryos were significantly reduced at circadian time 24 (CT24). Transcriptome analysis revealed significant differences in gene expression at CT24 between the Cry1 knockout mutant and the wild-type, with 2616 differentially expressed genes identified. The enriched Gene Ontology pathway includes enzyme activity, energy availability, and protein translation. Short neuropeptide F signaling was reduced in the CT24 embryonic brain of the mutant, the expression of the neuropeptide PTTH was also reduced and the rhythm was lost, which further affects ecdysteroid signaling. Our results suggested that the silkworm circadian clock affects neuropeptide-hormone signaling as well as physiological functions related to hatching, which may regulate the hatching rhythm.
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Affiliation(s)
- Xiao-Nan Yuan
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China
| | - Cheng Luo
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China
| | - Qi-Fan Zhao
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China
| | - Si-Yin Zhong
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China
| | - Qi Hang
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China
| | - Tai-Ming Dai
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China
| | - Zhong-Hua Pan
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China
| | - Yang-Hu Sima
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China
| | - Jian-Feng Qiu
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China
| | - Shi-Qing Xu
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China
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Qiu JF, Cui WZ, Zhang Q, Dai TM, Liu K, Li JL, Wang YJ, Sima YH, Xu SQ. Temporal transcriptome reveals that circadian clock is involved in the dynamic regulation of immune response to bacterial infection in Bombyx mori. INSECT SCIENCE 2023; 30:31-46. [PMID: 35446483 DOI: 10.1111/1744-7917.13043] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 03/11/2022] [Accepted: 03/23/2022] [Indexed: 06/14/2023]
Abstract
The circadian clock plays a critical role in the regulation of host immune defense. However, the mechanistic basis for this regulation is largely unknown. Herein, the core clock gene cryptochrome1 (cry1) knockout line in Bombyx mori, an invertebrate animal model, was constructed to obtain the silkworm with dysfunctional molecular clock, and the dynamic regulation of the circadian clock on the immune responsiveness within 24 h of Staphylococcus aureus infection was analyzed. We found that deletion of cry1 decreased viability of silkworms and significantly reduced resistance of larvae to S. aureus. Time series RNA-seq analysis identified thousands of rhythmically expressed genes, including immune response genes, in the larval immune tissue, fat bodies. Uninfected cry1 knockout silkworms exhibited expression patterns of rhythmically expressed genes similar to wild-type (WT) silkworms infected with S. aureus. However, cry1 knockout silkworms exhibited a seriously weakened response to S. aureus infection. The immune response peaked at 6 and 24 h after infection, during which "transcription storms" occurred, and the expression levels of the immune response genes, PGRP and antimicrobial peptides (AMPs), were significantly upregulated in WT. In contrast, cry1 knockout did not effectively activate Toll, Imd, or NF-κB signaling pathways during the immune adjustment period from 12 to 18 h after infection, resulting in failure to initiate the immune responsiveness peak at 24 h after infection. This may be related to inhibited silkworm fat body energy metabolism. These results demonstrated the dynamic regulation of circadian clock on silkworm immune response to bacterial infection and provided important insights into host antimicrobial defense mechanisms.
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Affiliation(s)
- Jian-Feng Qiu
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China, Jiangsu Province
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China, Jiangsu Province
| | - Wen-Zhao Cui
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China, Jiangsu Province
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China, Jiangsu Province
| | - Qiang Zhang
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China, Jiangsu Province
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China, Jiangsu Province
| | - Tai-Ming Dai
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China, Jiangsu Province
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China, Jiangsu Province
| | - Kai Liu
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China, Jiangsu Province
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China, Jiangsu Province
| | - Jiang-Lan Li
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China, Jiangsu Province
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China, Jiangsu Province
| | - Yu-Jun Wang
- Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou, China, Guangxi Province
| | - Yang-Hu Sima
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China, Jiangsu Province
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China, Jiangsu Province
| | - Shi-Qing Xu
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China, Jiangsu Province
- Institute of Agricultural Biotechnology & Ecology (IABE), Soochow University, Suzhou, China, Jiangsu Province
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Hou M, Dai TM, Liang XY, Zhang SX, Cui WZ, Qiu JF, Sima YH, Cui WZ, Xu SQ. Bombyx mori can synthesize ascorbic acid through the l-gulose pathway to varying degrees depending on developmental stage. ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 2021; 106:e21783. [PMID: 33719082 DOI: 10.1002/arch.21783] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 02/03/2021] [Accepted: 02/04/2021] [Indexed: 06/12/2023]
Abstract
Vitamin C (VC) is an essential nutrient for many animals. However, whether insects, including Bombyx mori, can synthesize VC remains unclear. In this article, the optimized HPLC method was used to determine the content of l-ascorbic acid (AsA) in silkworm eggs, larvae and pupae, and the activity of l-gulono-1,4-lactone oxidase (GULO), a key enzyme in VC synthesis. The RNA interference method was used to determine the effect of the BmGulo-like gene on embryonic development and GULO activity in the pupal fat body. The AsA content increased significantly during E144 h-E168 h in the late embryonic stage and P48 h-P144 h in the middle-late pupal stage, in which exogenous VC was not ingested. Furthermore, the body AsA content in larvae fed VC-free feed also increased with larval stage. The GULO enzymatic activity was present in eggs and the fat bodies of larvae and pupae, even when the larvae were reared with fresh mulberry leaves. Moreover, the activity was higher in the later embryonic stages (E144 h-E168 h) and the early pupal stage (before P24 h). The GULO activity in the pupal fat body dramatically decreased when the screened BmGulo-like gene (BGIBMGA005735) was knocked down with small interfering RNA; in addition, the survival rate and hatching rate of eggs significantly decreased 21% and 44%, respectively, and embryonic development was delayed. Thus, Bombyx mori can synthesize AsA through the l-gulose pathway, albeit with low activity, and this synthesis ability varies with developmental stages.
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Affiliation(s)
- Man Hou
- College of Forestry, Shandong Agricultural University, Taian, Shandong, China
- School of Biology and Basic Medical Sciences, Medical College, Soochow University, Suzhou, China
| | - Tai-Ming Dai
- School of Biology and Basic Medical Sciences, Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology and Ecology (IABE), Soochow University, Suzhou, China
| | - Xin-Yin Liang
- School of Biology and Basic Medical Sciences, Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology and Ecology (IABE), Soochow University, Suzhou, China
| | - Sheng-Xiang Zhang
- College of Forestry, Shandong Agricultural University, Taian, Shandong, China
| | - Wen-Zhao Cui
- School of Biology and Basic Medical Sciences, Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology and Ecology (IABE), Soochow University, Suzhou, China
| | - Jian-Feng Qiu
- School of Biology and Basic Medical Sciences, Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology and Ecology (IABE), Soochow University, Suzhou, China
| | - Yang-Hu Sima
- School of Biology and Basic Medical Sciences, Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology and Ecology (IABE), Soochow University, Suzhou, China
| | - Wei-Zheng Cui
- College of Forestry, Shandong Agricultural University, Taian, Shandong, China
| | - Shi-Qing Xu
- School of Biology and Basic Medical Sciences, Medical College, Soochow University, Suzhou, China
- Institute of Agricultural Biotechnology and Ecology (IABE), Soochow University, Suzhou, China
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