1
|
Zhu SQ, Zhang YJ, Abbas MN, Hao XW, Zhao YZ, Liang HH, Cui HJ, Yang LQ. Hedgehog promotes cell proliferation in the midgut of silkworm, Bombyx mori. INSECT SCIENCE 2020; 27:697-707. [PMID: 30919568 DOI: 10.1111/1744-7917.12672] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 01/29/2019] [Accepted: 02/10/2019] [Indexed: 06/09/2023]
Abstract
The Hedgehog (Hh) signaling pathway is one of the major regulators of embryonic development and tissue homeostasis in multicellular organisms. However, the role of this pathway in the silkworm, especially in the silkworm midgut, remains poorly understood. Here, we report that Bombyx mori Hedgehog (BmHh) is expressed in most tissues of silkworm larvae and that its functions are well-conserved throughout evolution. We further demonstrate that the messenger RNA of four Hh signaling components, BmHh ligand, BmPtch receptor, signal transducer BmSmo and transcription factor BmCi, are all upregulated following Escherichia coli or Bacillus thuringiensis infection, indicating the activation of the Hh pathway. Simultaneously, midgut cell proliferation is strongly promoted. Conversely, the repression of Hh signal transduction with double-stranded RNA or cyclopamine inhibits the expression of BmHh and BmCi and reduces cell proliferation. Overall, these findings provide new insights into the Hh signaling pathway in the silkworm, B. mori.
Collapse
Affiliation(s)
- Shun-Qin Zhu
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
- School of Life Sciences, Southwest University, Chongqing, China
| | - Ya-Jun Zhang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
- Chongqing Engineering Laboratory of Targeted and Innovative Therapeutics, Chongqing Key Laboratory of Kinase Modulators as Innovative Medicine, IATTI, Chongqing University of Arts and Sciences, Chongqing, China
| | - Muhammad Nadeem Abbas
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Xiang-Wei Hao
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Yu-Zu Zhao
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Hang-Hua Liang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Hong-Juan Cui
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Li-Qun Yang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| |
Collapse
|
2
|
Takiya S, Tsubota T, Kimoto M. Regulation of Silk Genes by Hox and Homeodomain Proteins in the Terminal Differentiated Silk Gland of the Silkworm Bombyx mori. J Dev Biol 2016; 4:E19. [PMID: 29615585 PMCID: PMC5831788 DOI: 10.3390/jdb4020019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 05/08/2016] [Accepted: 05/17/2016] [Indexed: 12/15/2022] Open
Abstract
The silk gland of the silkworm Bombyx mori is a long tubular organ that is divided into several subparts along its anteroposterior (AP) axis. As a trait of terminal differentiation of the silk gland, several silk protein genes are expressed with unique regional specificities. Most of the Hox and some of the homeobox genes are also expressed in the differentiated silk gland with regional specificities. The expression patterns of Hox genes in the silk gland roughly correspond to those in embryogenesis showing "colinearity". The central Hox class protein Antennapedia (Antp) directly regulates the expression of several middle silk gland-specific silk genes, whereas the Lin-1/Isl-1/Mec3 (LIM)-homeodomain transcriptional factor Arrowhead (Awh) regulates the expression of posterior silk gland-specific genes for silk fiber proteins. We summarize our results and discuss the usefulness of the silk gland of Bombyx mori for analyzing the function of Hox genes. Further analyses of the regulatory mechanisms underlying the region-specific expression of silk genes will provide novel insights into the molecular bases for target-gene selection and regulation by Hox and homeodomain proteins.
Collapse
Affiliation(s)
- Shigeharu Takiya
- Shigeharu Takiya, Division of Biological Sciences and Center for Genome Dynamics, Faculty of Science, Hokkaido University, North 10, West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan.
- Graduate School of Life Science, Hokkaido University, North 10, West 8, Kita-ku, Sapporo 060-0810, Japan.
| | - Takuya Tsubota
- Transgenic Silkworm Research Unit, Institute of Agrobiological Sciences, National Agriculture and Food Research Organization, 1-2 Owashi, Tsukuba, Ibaraki 305-8634, Japan.
| | - Mai Kimoto
- Graduate School of Life Science, Hokkaido University, North 10, West 8, Kita-ku, Sapporo 060-0810, Japan.
| |
Collapse
|
3
|
Liang S, Chen RT, Zhang DP, Xin HH, Lu Y, Wang MX, Miao YG. Hedgehog signaling pathway regulated the target genes for adipogenesis in silkworm Bombyx mori. INSECT SCIENCE 2015; 22:587-596. [PMID: 25154865 DOI: 10.1111/1744-7917.12164] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/12/2014] [Indexed: 06/03/2023]
Abstract
Hedgehog (Hh) signals regulate invertebrate and vertebrate development, yet the role of the pathway in adipose development remains poorly understood. In this report, we found that Hh pathway components are expressed in the fat body of silkworm larvae. Functional analysis of these components in a BmN cell line model revealed that activation of the Hh gene stimulated transcription of Hh pathway components, but inhibited the expression of the adipose marker gene AP2. Conversely, specific RNA interference-mediated knockdown of Hh resulted in increased AP2 expression. This further showed the regulation of Hh signal on the adipose marker gene. In silkworm larval models, enhanced adipocyte differentiation and an increase in adipocyte cell size were observed in silkworms that had been treated with a specific Hh signaling pathway antagonist, cyclopamine. The fat-body-specific Hh blockade tests were consistent with Hh signaling inhibiting silkworm adipogenesis. Our results indicate that the role of Hh signaling in inhibiting fat formation is conserved in vertebrates and invertebrates.
Collapse
Affiliation(s)
- Shuang Liang
- Key Laboratory of Animal Virology of Ministry of Agriculture, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
| | - Rui-Ting Chen
- Key Laboratory of Animal Virology of Ministry of Agriculture, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
| | - Deng-Pan Zhang
- Key Laboratory of Animal Virology of Ministry of Agriculture, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
| | - Hu-Hu Xin
- Key Laboratory of Animal Virology of Ministry of Agriculture, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yan Lu
- Key Laboratory of Animal Virology of Ministry of Agriculture, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
| | - Mei-Xian Wang
- Key Laboratory of Animal Virology of Ministry of Agriculture, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yun-Gen Miao
- Key Laboratory of Animal Virology of Ministry of Agriculture, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
| |
Collapse
|
4
|
LUO SHAOBO, JIA JINMING, HU HAIXIANG, MA WEIGUO, JIAO YONGZHENG, DONG JIACHEN. A Chinese herbal decoction can increase the intracellular Ca2+ concentration and CatSper1 expression in mouse sperm tails. Mol Med Rep 2012; 7:195-200. [DOI: 10.3892/mmr.2012.1118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Accepted: 09/21/2012] [Indexed: 11/06/2022] Open
|
5
|
Dhawan S, Gopinathan KP. Molecular cloning and expression pattern of an armadillo homologue from the mulberry silkworm Bombyx mori. Gene Expr Patterns 2003; 4:15-23. [PMID: 14678823 DOI: 10.1016/j.modgep.2003.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Armadillo/beta-catenin, encoded by the segment polarity gene armadillo functions as a downstream effector of canonical Wnt signals. The expression patterns of Bm wnt-1, -Ci and -engrailed, suggested the presence of Wnt-1 network in the middle silkglands of Bombyx mori. To test this, a homologue of armadillo from B. mori (Bm arm) was cloned by PCR using degenerate primers, designed based on the conserved regions of the protein, and characterized. The cloned region harboured one complete and two incomplete Armadillo (Arm) repeat motifs and was highly conserved across species. Genomic Southern analysis suggested Bm arm to be a multi-copy gene. The expression of Bm arm RNA was first detected at stage 6 of embryogenesis, which reached maximum levels at stage 21C and was maintained until larval hatching. The RNA was expressed uniformly in the embryos, whereas the Arm protein was localized in a segmentally reiterated striped pattern, in conformity with its predicted segment polarity nature. Bm arm was also expressed in the entire silkgland and the transition from third to fourth and fifth larval intermoults was accompanied by an increase in the transcript levels. However, the Arm protein was predominantly localized to the middle silkglands, especially the middle and posterior sub-compartments. The silkglands represented a novel expression domain for arm in Bombyx, and the results were consistent with the existence of a canonical Wnt network in the middle silkglands.
Collapse
Affiliation(s)
- Sangeeta Dhawan
- Department of Microbiology and Cell Biology, Indian Institute of Science, Sir CV Raman Circle, Bangalore 560012, India.
| | | |
Collapse
|
6
|
Dhawan S, Gopinathan KP. Spatio-temporal expression of wnt-1 during embryonic-, wing- and silkgland development in Bombyx mori. Gene Expr Patterns 2003; 3:559-70. [PMID: 12971988 DOI: 10.1016/s1567-133x(03)00122-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A homologue of the segment polarity gene wnt-1 from Bombyx mori (Bmwnt-1) has been characterized. The segmentally reiterated pattern of Bmwnt-1 transcrip9t distribution in B. mori embryos suggested its segment polarity function. Maximal levels of Bmwnt-1 RNA during embryonic development were reached by stage 21A. In the larval stages, Bmwnt-1 was expressed in the fore- and hindwing discs, ovaries, testes and gut, reminiscent of the expression domains in Drosophila. Bmwnt-1 was expressed in the wing-margin area of both the fore- and hindwing discs. The pattern of wnt-1 expression in the hindwing discs was similar to that in the butterfly Precis coenia but subtle differences existed in forewing discs of the two species, which correlated well with the absence of proximal bands of pigmentation in the adult Bombyx wings. In addition, Bmwnt-1 was expressed in the silkglands and the expression was confined to the anterior sub-compartment within the middle silkglands throughout development from the embryonic to late larval stages. This domain of Bmwnt-1 expression overlapped with those of Cubitus interruptus (BmCi) and sericin-2 but excluded the Engrailed expression domain viz. the middle and posterior sub-compartments of middle silkglands. Bmwnt-1 expression was detected only during the intermoults and not in the moulting periods.
Collapse
Affiliation(s)
- S Dhawan
- Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore 560012, India
| | | |
Collapse
|