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Nakato E, Baker S, Kinoshita-Toyoda A, Knudsen C, Lu YS, Takemura M, Toyoda H, Nakato H. In vivo activities of heparan sulfate differentially modified by NDSTs during development. PROTEOGLYCAN RESEARCH 2024; 2:e17. [PMID: 38616954 PMCID: PMC11011245 DOI: 10.1002/pgr2.17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Accepted: 02/02/2024] [Indexed: 04/16/2024]
Abstract
Heparan sulfate proteoglycans (HSPGs) serve as co-receptors for growth factor signaling during development. It is well known that the level and patterns of sulfate groups of heparan sulfate (HS) chains, or HS fine structures, have a major impact on HSPG function. On the other hand, the physiological significance of other structural features of HS, including NS/NA domain organization, remains to be elucidated. A blueprint of the HS domain structures is mainly controlled by HS N-deacetylase/N-sulfotransferases (NDSTs). To analyze in vivo activities of differentially modified HS, we established two knock-in (KI) Drosophila strains with the insertion of mouse Ndst1 (mNdst1) or Ndst2 (mNdst2) in the locus of sulfateless (sfl), the only Drosophila NDST. In these KI lines, mNDSTs are expressed from the sfl locus, in the level and patterns identical to the endogenous sfl gene. Thus, phenotypes of Ndst1 KI and Ndst2KI animals reflect the ability of HS structures made by these enzymes to rescue sfl mutation. Remarkably, we found that mNdst1 completely rescued the loss of sfl. mNdst2 showed a limited rescue ability, despite a higher level of HS sulfation compared to HS in mNdst1 KI. Our study suggests that independent of sulfation levels, additional HS structural features controlled by NDSTs play key roles during tissue patterning.
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Affiliation(s)
- Eriko Nakato
- Department of Genetics, Cell Biology, and Development, University of Minnesota, Minneapolis, Minnesota, USA
| | - Sarah Baker
- Department of Genetics, Cell Biology, and Development, University of Minnesota, Minneapolis, Minnesota, USA
| | | | - Collin Knudsen
- Department of Genetics, Cell Biology, and Development, University of Minnesota, Minneapolis, Minnesota, USA
| | - Yi-Si Lu
- Department of Genetics, Cell Biology, and Development, University of Minnesota, Minneapolis, Minnesota, USA
| | | | - Hidenao Toyoda
- Faculty of Pharmaceutical Sciences, Ritsumeikan University, Shiga, Japan
| | - Hiroshi Nakato
- Department of Genetics, Cell Biology, and Development, University of Minnesota, Minneapolis, Minnesota, USA
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Knudsen C, Woo Seuk Koh, Izumikawa T, Nakato E, Akiyama T, Kinoshita-Toyoda A, Haugstad G, Yu G, Toyoda H, Nakato H. Chondroitin sulfate is required for follicle epithelial integrity and organ shape maintenance in Drosophila. Development 2023; 150:dev201717. [PMID: 37694610 PMCID: PMC10508698 DOI: 10.1242/dev.201717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 08/21/2023] [Indexed: 09/12/2023]
Abstract
Heparan sulfate (HS) and chondroitin sulfate (CS) are evolutionarily conserved glycosaminoglycans that are found in most animal species, including the genetically tractable model organism Drosophila. In contrast to extensive in vivo studies elucidating co-receptor functions of Drosophila HS proteoglycans (PGs), only a limited number of studies have been conducted for those of CSPGs. To investigate the global function of CS in development, we generated mutants for Chondroitin sulfate synthase (Chsy), which encodes the Drosophila homolog of mammalian chondroitin synthase 1, a crucial CS biosynthetic enzyme. Our characterizations of the Chsy mutants indicated that a fraction survive to adult stage, which allowed us to analyze the morphology of the adult organs. In the ovary, Chsy mutants exhibited altered stiffness of the basement membrane and muscle dysfunction, leading to a gradual degradation of the gross organ structure as mutant animals aged. Our observations show that normal CS function is required for the maintenance of the structural integrity of the ECM and gross organ architecture.
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Affiliation(s)
- Collin Knudsen
- Department of Genetics, Cell Biology, and Development, University of Minnesota at Twin Cities, Minneapolis, MN 55455, USA
| | - Woo Seuk Koh
- Department of Genetics, Cell Biology, and Development, University of Minnesota at Twin Cities, Minneapolis, MN 55455, USA
| | - Tomomi Izumikawa
- Faculty of Pharmaceutical Sciences, Ritsumeikan University, Shiga 525-8577, Japan
| | - Eriko Nakato
- Department of Genetics, Cell Biology, and Development, University of Minnesota at Twin Cities, Minneapolis, MN 55455, USA
| | - Takuya Akiyama
- Stowers Institute for Medical Research, Kansas City, MO 64110, USA
| | | | - Greg Haugstad
- Characterization Facility, University of Minnesota at Twin Cities, Minneapolis, MN 55455, USA
| | - Guichuan Yu
- Characterization Facility, University of Minnesota at Twin Cities, Minneapolis, MN 55455, USA
| | - Hidenao Toyoda
- Faculty of Pharmaceutical Sciences, Ritsumeikan University, Shiga 525-8577, Japan
| | - Hiroshi Nakato
- Department of Genetics, Cell Biology, and Development, University of Minnesota at Twin Cities, Minneapolis, MN 55455, USA
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Koh WS, Knudsen C, Izumikawa T, Nakato E, Grandt K, Kinoshita-Toyoda A, Toyoda H, Nakato H. Regulation of morphogen pathways by a Drosophila chondroitin sulfate proteoglycan Windpipe. J Cell Sci 2023; 136:jcs260525. [PMID: 36897575 PMCID: PMC10113886 DOI: 10.1242/jcs.260525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 03/02/2023] [Indexed: 03/11/2023] Open
Abstract
Morphogens provide quantitative and robust signaling systems to achieve stereotypic patterning and morphogenesis. Heparan sulfate (HS) proteoglycans (HSPGs) are key components of such regulatory feedback networks. In Drosophila, HSPGs serve as co-receptors for a number of morphogens, including Hedgehog (Hh), Wingless (Wg), Decapentaplegic (Dpp) and Unpaired (Upd, or Upd1). Recently, Windpipe (Wdp), a chondroitin sulfate (CS) proteoglycan (CSPG), was found to negatively regulate Upd and Hh signaling. However, the roles of Wdp, and CSPGs in general, in morphogen signaling networks are poorly understood. We found that Wdp is a major CSPG with 4-O-sulfated CS in Drosophila. Overexpression of wdp modulates Dpp and Wg signaling, showing that it is a general regulator of HS-dependent pathways. Although wdp mutant phenotypes are mild in the presence of morphogen signaling buffering systems, this mutant in the absence of Sulf1 or Dally, molecular hubs of the feedback networks, produces high levels of synthetic lethality and various severe morphological phenotypes. Our study indicates a close functional relationship between HS and CS, and identifies the CSPG Wdp as a novel component in morphogen feedback pathways.
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Affiliation(s)
- Woo Seuk Koh
- Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA
| | - Collin Knudsen
- Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA
| | - Tomomi Izumikawa
- Faculty of Pharmaceutical Sciences, Ritsumeikan University, Shiga 525-8577, Japan
| | - Eriko Nakato
- Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA
| | - Kristin Grandt
- Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA
| | | | - Hidenao Toyoda
- Faculty of Pharmaceutical Sciences, Ritsumeikan University, Shiga 525-8577, Japan
| | - Hiroshi Nakato
- Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA
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Generation of Drosophila Heparan Sulfate Mutant Cell Lines from Existing Fly Strains. Methods Mol Biol 2021. [PMID: 34626411 DOI: 10.1007/978-1-0716-1398-6_47] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
Genetic studies using a model organism, Drosophila melanogaster, have been contributing to elucidating the in vivo functions of heparan sulfate proteoglycans (HSPGs). On the other hand, biochemical analysis of Drosophila glycosaminoglycans (GAGs) has been limited, mainly due to the insufficient amount of the material obtained from the animal. Recently, a novel in vitro system has been developed by establishing mutant cell lines for heparan sulfate (HS)-modifying enzyme genes. Metabolic radiolabeling of GAGs allows us to assess uncharacterized features of Drosophila GAGs and the effects of the mutations on HS structures and function. The novel in vitro system will provide us with a direct link between detailed structural information of Drosophila HS and a wealth of knowledge on biological phenotypic data obtained over the last two decades using this animal model.
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