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Xu P, Cai X, Guan X, Xie W. Sulfoconjugation of protein peptides and glycoproteins in physiology and diseases. Pharmacol Ther 2023; 251:108540. [PMID: 37777160 PMCID: PMC10842354 DOI: 10.1016/j.pharmthera.2023.108540] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 09/21/2023] [Accepted: 09/25/2023] [Indexed: 10/02/2023]
Abstract
Protein sulfoconjugation, or sulfation, represents a critical post-translational modification (PTM) process that involves the attachment of sulfate groups to various positions of substrates within the protein peptides or glycoproteins. This process plays a dynamic and complex role in many physiological and pathological processes. Here, we summarize the importance of sulfation in the fields of oncology, virology, drug-induced liver injury (DILI), inflammatory bowel disease (IBD), and atherosclerosis. In oncology, sulfation is involved in tumor initiation, progression, and migration. In virology, sulfation influences viral entry, replication, and host immune response. In DILI, sulfation is associated with the incidence of DILI, where altered sulfation affects drug metabolism and toxicity. In IBD, dysregulation of sulfation compromises mucosal barrier and immune response. In atherosclerosis, sulfation influences the development of atherosclerosis by modulating the accumulation of lipoprotein, and the inflammation, proliferation, and migration of smooth muscle cells. The current review underscores the importance of further research to unravel the underlying mechanisms and therapeutic potential of targeting sulfoconjugation in various diseases. A better understanding of sulfation could facilitate the emergence of innovative diagnostic or therapeutic strategies.
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Affiliation(s)
- Pengfei Xu
- Center for Pharmacogenetics and Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA 15261, USA; Department of Hepatobiliary and Pancreatic Surgery, Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430072, China
| | - Xinran Cai
- Center for Pharmacogenetics and Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Xiuchen Guan
- Department of Orthodontics, School of Stomatology, Capital Medical University, Beijing 100069, China
| | - Wen Xie
- Center for Pharmacogenetics and Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA 15261, USA; Department of Pharmacology & Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA.
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2
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Zhang Y, Pasca di Magliano M. Tyrosine Sulfation: A New Player and Potential Target in Pancreatic Cancer. Cell Mol Gastroenterol Hepatol 2023; 16:501-502. [PMID: 37423257 PMCID: PMC10444954 DOI: 10.1016/j.jcmgh.2023.06.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 06/16/2023] [Accepted: 06/16/2023] [Indexed: 07/11/2023]
Affiliation(s)
- Yaqing Zhang
- Department of Surgery, University of Michigan, Ann Arbor, Michigan; Rogel Cancer Center, University of Michigan, Ann Arbor, Michigan
| | - Marina Pasca di Magliano
- Department of Surgery, University of Michigan, Ann Arbor, Michigan; Rogel Cancer Center, University of Michigan, Ann Arbor, Michigan; Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, Michigan
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3
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Cai X, Li S, Zeng X, Xu M, Wang Z, Singhi AD, Tang D, Li S, Yates NA, Yang D, Xie W. Inhibition of the SLC35B2-TPST2 Axis of Tyrosine Sulfation Attenuates the Growth and Metastasis of Pancreatic Ductal Adenocarcinom. Cell Mol Gastroenterol Hepatol 2023; 16:473-495. [PMID: 37192689 PMCID: PMC10393550 DOI: 10.1016/j.jcmgh.2023.05.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2022] [Revised: 05/08/2023] [Accepted: 05/09/2023] [Indexed: 05/18/2023]
Abstract
BACKGROUND & AIMS Pancreatic ductal adenocarcinoma (PDAC) is the fourth leading cause of cancer deaths in the United States. Tyrosine sulfation, catalyzed by the tyrosylprotein sulfotransferase 2 (TPST2), is a post-translational modification essential for protein-protein interactions and cellular functions. Solute carrier family 35 member B (SLC35B2) is a key transporter that transports the universal sulfate donor 3'-phosphoadenosine 5'-phosphosulfate into the Golgi apparatus where the protein sulfation occurs. The goal of this study was to determine whether and how the SLC35B2-TPST2 axis of tyrosine sulfation plays a role in PDAC. METHODS Gene expression was analyzed in PDAC patients and mice. Human PDAC MIA PaCa-2 and PANC-1 cells were used for in vitro studies. TPST2-deficient MIA PaCa-2 cells were generated to assess xenograft tumor growth in vivo. Mouse PDAC cells derived from the KrasLSL-G12D/+;Tp53L/+;Pdx1-Cre (KPC) mice were used to generate Tpst2 knockout KPC cells to evaluate tumor growth and metastasis in vivo. RESULTS High expressions of SLC35B2 and TPST2 were correlated with poor PDAC patient survival. Knocking down SLC35B2 or TPST2, or pharmacologicically inhibiting sulfation, resulted in the inhibition of PDAC cell proliferation and migration in vitro. TPST2-deficient MIA PaCa-2 cells showed inhibited xenograft tumor growth. Orthotopic inoculation of Tpst2 knockout KPC cells in mice showed inhibition of primary tumor growth, local invasion, and metastasis. Mechanistically, the integrin β4 was found to be a novel substrate of TPST2. Inhibition of sulfation destabilizes integrin β4 protein, which may have accounted for the suppression of metastasis. CONCLUSIONS Targeting the SLC35B2-TPST2 axis of tyrosine sulfation may represent a novel approach for therapeutic intervention of PDAC.
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Affiliation(s)
- Xinran Cai
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Sihan Li
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Xuemei Zeng
- Biomedical Mass Spectrometry Center, University of Pittsburgh Schools of the Health Sciences, Pittsburgh, Pennsylvania
| | - Meishu Xu
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Zehua Wang
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Aatur D Singhi
- Department of Pathology, School of Medicine, University of Pittsburgh Medical Center, University of Pittsburgh, Pittsburgh, Pennsylvania; Pittsburgh Liver Research Center, School of Medicine, University of Pittsburgh Medical Center, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Daolin Tang
- Department of Surgery, University of Texas Southwestern Medical Center, Dallas, Texas
| | - Song Li
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Nathan A Yates
- Biomedical Mass Spectrometry Center, University of Pittsburgh Schools of the Health Sciences, Pittsburgh, Pennsylvania; Department of Cell Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Da Yang
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Wen Xie
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania.
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4
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Das KK, Brown JW. 3'-sulfated Lewis A/C: An oncofetal epitope associated with metaplastic and oncogenic plasticity of the gastrointestinal foregut. Front Cell Dev Biol 2023; 11:1089028. [PMID: 36866273 PMCID: PMC9971977 DOI: 10.3389/fcell.2023.1089028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 01/10/2023] [Indexed: 02/16/2023] Open
Abstract
Metaplasia, dysplasia, and cancer arise from normal epithelia via a plastic cellular transformation, typically in the setting of chronic inflammation. Such transformations are the focus of numerous studies that strive to identify the changes in RNA/Protein expression that drive such plasticity along with the contributions from the mesenchyme and immune cells. However, despite being widely utilized clinically as biomarkers for such transitions, the role of glycosylation epitopes is understudied in this context. Here, we explore 3'-Sulfo-Lewis A/C, a clinically validated biomarker for high-risk metaplasia and cancer throughout the gastrointestinal foregut: esophagus, stomach, and pancreas. We discuss the clinical correlation of sulfomucin expression with metaplastic and oncogenic transformation, as well as its synthesis, intracellular and extracellular receptors and suggest potential roles for 3'-Sulfo-Lewis A/C in contributing to and maintaining these malignant cellular transformations.
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Affiliation(s)
- Koushik K Das
- Division of Gastroenterology, Department of Medicine, Washington University in St. Louis, School of Medicine, St. Louis, MO, United States
| | - Jeffrey W Brown
- Division of Gastroenterology, Department of Medicine, Washington University in St. Louis, School of Medicine, St. Louis, MO, United States
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5
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Lata S, Mishra R, Arya RP, Arora P, Lahon A, Banerjea AC, Sood V. Where all the Roads Meet? A Crossover Perspective on Host Factors Regulating SARS-CoV-2 infection. J Mol Biol 2022; 434:167403. [PMID: 34914966 PMCID: PMC8666384 DOI: 10.1016/j.jmb.2021.167403] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 11/18/2021] [Accepted: 12/07/2021] [Indexed: 01/11/2023]
Abstract
COVID-19 caused by SARS-CoV-2 is the latest pandemic which has thrown the world into an unprecedented social and economic uncertainties along with huge loss to humanity. Identification of the host factors regulating the replication of SARS-CoV-2 in human host may help in the development of novel anti-viral therapies to combat the viral infection and spread. Recently, some research groups used genome-wide CRISPR/Cas screening to identify the host factors critical for the SARS-CoV-2 replication and infection. A comparative analysis of these significant host factors (p < 0.05) identified fifteen proteins common in these studies. Apart from ACE2 (receptor for SARS-CoV-2 attachment), other common host factors were CSNK2B, GDI2, SLC35B2, DDX51, VPS26A, ARPP-19, C1QTNF7, ALG6, LIMA1, COG3, COG8, BCOR, LRRN2 and TLR9. Additionally, viral interactome of these host factors revealed that many of them were associated with several SARS-CoV-2 proteins as well. Interestingly, some of these host factors have already been shown to be critical for the pathogenesis of other viruses suggesting their crucial role in virus-host interactions. Here, we review the functions of these host factors and their role in other diseases with special emphasis on viral diseases.
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Affiliation(s)
- Sneh Lata
- Virology Laboratory, National Institute of Immunology, New Delhi, India
| | - Ritu Mishra
- Virology Laboratory, National Institute of Immunology, New Delhi, India
| | - Ravi P. Arya
- KSBS, Indian Institute of Technology, New Delhi, India
| | - Pooja Arora
- Hansraj College, University of Delhi, New Delhi, India
| | | | - Akhil C. Banerjea
- Institute of Advanced Virology, Kerala, India,Corresponding authors
| | - Vikas Sood
- Biochemistry Department, Jamia Hamdard, New Delhi, India,Corresponding authors
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6
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Kawashima S, Inozume T, Kawazu M, Ueno T, Nagasaki J, Tanji E, Honobe A, Ohnuma T, Kawamura T, Umeda Y, Nakamura Y, Kawasaki T, Kiniwa Y, Yamasaki O, Fukushima S, Ikehara Y, Mano H, Suzuki Y, Nishikawa H, Matsue H, Togashi Y. TIGIT/CD155 axis mediates resistance to immunotherapy in patients with melanoma with the inflamed tumor microenvironment. J Immunother Cancer 2021; 9:jitc-2021-003134. [PMID: 34795004 PMCID: PMC8603290 DOI: 10.1136/jitc-2021-003134] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/19/2021] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Patients with cancer benefit from treatment with immune checkpoint inhibitors (ICIs), and those with an inflamed tumor microenvironment (TME) and/or high tumor mutation burden (TMB), particularly, tend to respond to ICIs; however, some patients fail, whereas others acquire resistance after initial response despite the inflamed TME and/or high TMB. We assessed the detailed biological mechanisms of resistance to ICIs such as programmed death 1 and/or cytotoxic T-lymphocyte-associated protein 4 blockade therapies using clinical samples. METHODS We established four pairs of autologous tumor cell lines and tumor-infiltrating lymphocytes (TILs) from patients with melanoma treated with ICIs. These tumor cell lines and TILs were subjected to comprehensive analyses and in vitro functional assays. We assessed tumor volume and TILs in vivo mouse models to validate identified mechanism. Furthermore, we analyzed additional clinical samples from another large melanoma cohort. RESULTS Two patients were super-responders, and the others acquired resistance: the first patient had a non-inflamed TME and acquired resistance due to the loss of the beta-2 microglobulin gene, and the other acquired resistance despite having inflamed TME and extremely high TMB which are reportedly predictive biomarkers. Tumor cell line and paired TIL analyses showed high CD155, TIGIT ligand, and TIGIT expression in the tumor cell line and tumor-infiltrating T cells, respectively. TIGIT blockade or CD155-deletion activated T cells in a functional assay using an autologous cell line and paired TILs from this patient. CD155 expression increased in surviving tumor cells after coculturing with TILs from a responder, which suppressed TIGIT+ T-cell activation. Consistently, TIGIT blockade or CD155-deletion could aid in overcoming resistance to ICIs in vivo mouse models. In clinical samples, CD155 was related to resistance to ICIs in patients with melanoma with an inflamed TME, including both primary and acquired resistance. CONCLUSIONS The TIGIT/CD155 axis mediates resistance to ICIs in patients with melanoma with an inflamed TME, promoting the development of TIGIT blockade therapies in such patients with cancer.
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Affiliation(s)
- Shusuke Kawashima
- Research Institute, Chiba Cancer Center, Chiba, Japan.,Department of Dermatology, Chiba University Graduate School of Medicine, Chiba, Japan
| | - Takashi Inozume
- Research Institute, Chiba Cancer Center, Chiba, Japan.,Department of Dermatology, Chiba University Graduate School of Medicine, Chiba, Japan.,Department of Dermatology, University of Yamanashi, Chuo, Japan
| | - Masahito Kawazu
- Research Institute, Chiba Cancer Center, Chiba, Japan.,Division of Cellular Signaling, National Cancer Center Research Institute, Chuo-ku, Japan
| | - Toshihide Ueno
- Division of Cellular Signaling, National Cancer Center Research Institute, Chuo-ku, Japan
| | - Joji Nagasaki
- Research Institute, Chiba Cancer Center, Chiba, Japan
| | - Etsuko Tanji
- Research Institute, Chiba Cancer Center, Chiba, Japan
| | - Akiko Honobe
- Department of Dermatology, University of Yamanashi, Chuo, Japan
| | - Takehiro Ohnuma
- Department of Dermatology, University of Yamanashi, Chuo, Japan.,Department of Dermatology and Plastic Surgery, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
| | | | - Yoshiyasu Umeda
- Department of Skin Oncology/Dermatology, Saitama Medical University International Medical Center, Hidaka, Japan
| | - Yasuhiro Nakamura
- Department of Skin Oncology/Dermatology, Saitama Medical University International Medical Center, Hidaka, Japan
| | - Tomonori Kawasaki
- Department of Pathology, Saitama Medical University International Medical Center, Hidaka, Japan
| | - Yukiko Kiniwa
- Department of Dermatology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Osamu Yamasaki
- Department of Dermatology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Satoshi Fukushima
- Department of Dermatology and Plastic Surgery, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
| | - Yuzuru Ikehara
- Department of Molecular and Tumor Pathology, Chiba University Graduate School of Medicine, Chiba, Japan
| | - Hiroyuki Mano
- Division of Cellular Signaling, National Cancer Center Research Institute, Chuo-ku, Japan
| | - Yutaka Suzuki
- Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan
| | - Hiroyoshi Nishikawa
- Division of Cancer Immunology, Research Institute/Exploratory Oncology Research and Clinical Trial Center (EPOC), National Cancer Center, Chuo-ku/Kashiwa, Japan.,Department of Immunology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Hiroyuki Matsue
- Department of Dermatology, Chiba University Graduate School of Medicine, Chiba, Japan
| | - Yosuke Togashi
- Research Institute, Chiba Cancer Center, Chiba, Japan .,Division of Cancer Immunology, Research Institute/Exploratory Oncology Research and Clinical Trial Center (EPOC), National Cancer Center, Chuo-ku/Kashiwa, Japan.,Department of Tumor Microenvironment, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
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7
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A Genome-Wide CRISPR-Cas9 Screen Reveals the Requirement of Host Cell Sulfation for Schmallenberg Virus Infection. J Virol 2020; 94:JVI.00752-20. [PMID: 32522852 DOI: 10.1128/jvi.00752-20] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 06/05/2020] [Indexed: 02/07/2023] Open
Abstract
Schmallenberg virus (SBV) is an insect-transmitted orthobunyavirus that can cause abortions and congenital malformations in the offspring of ruminants. Even though the two viral surface glycoproteins Gn and Gc are involved in host cell entry, the specific cellular receptors of SBV are currently unknown. Using genome-wide CRISPR-Cas9 forward screening, we identified 3'-phosphoadenosine 5'-phosphosulfate (PAPS) transporter 1 (PAPST1) as an essential factor for SBV infection. PAPST1 is a sulfotransferase involved in heparan sulfate proteoglycan synthesis encoded by the solute carrier family 35 member B2 gene (SLC35B2). SBV cell surface attachment and entry were largely reduced upon the knockout of SLC35B2, whereas the reconstitution of SLC35B2 in these cells fully restored their susceptibility to SBV infection. Furthermore, treatment of cells with heparinase diminished infection with SBV, confirming that heparan sulfate plays an important role in cell attachment and entry, although to various degrees, heparan sulfate was also found to be important to initiate infection by two other bunyaviruses, La Crosse virus and Rift Valley fever virus. Thus, PAPST1-triggered synthesis of cell surface heparan sulfate is required for the efficient replication of SBV and other bunyaviruses.IMPORTANCE SBV is a newly emerging orthobunyavirus (family Peribunyaviridae) that has spread rapidly across Europe since 2011, resulting in substantial economic losses in livestock farming. In this study, we performed unbiased genome-wide CRISPR-Cas9 screening and identified PAPST1, a sulfotransferase encoded by SLC35B2, as a host entry factor for SBV. Consistent with its role in the synthesis of heparan sulfate, we show that this activity is required for efficient infection by SBV. A comparable dependency on heparan sulfate was also observed for La Crosse virus and Rift Valley fever virus, highlighting the importance of heparan sulfate for host cell infection by bunyaviruses. Thus, the present work provides crucial insights into virus-host interactions of important animal and human pathogens.
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8
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Sosicka P, Bazan B, Maszczak-Seneczko D, Shauchuk Y, Olczak T, Olczak M. SLC35A5 Protein-A Golgi Complex Member with Putative Nucleotide Sugar Transport Activity. Int J Mol Sci 2019; 20:ijms20020276. [PMID: 30641943 PMCID: PMC6359379 DOI: 10.3390/ijms20020276] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 12/18/2018] [Accepted: 01/07/2019] [Indexed: 12/12/2022] Open
Abstract
Solute carrier family 35 member A5 (SLC35A5) is a member of the SLC35A protein subfamily comprising nucleotide sugar transporters. However, the function of SLC35A5 is yet to be experimentally determined. In this study, we inactivated the SLC35A5 gene in the HepG2 cell line to study a potential role of this protein in glycosylation. Introduced modification affected neither N- nor O-glycans. There was also no influence of the gene knock-out on glycolipid synthesis. However, inactivation of the SLC35A5 gene caused a slight increase in the level of chondroitin sulfate proteoglycans. Moreover, inactivation of the SLC35A5 gene resulted in the decrease of the uridine diphosphate (UDP)-glucuronic acid, UDP-N-acetylglucosamine, and UDP-N-acetylgalactosamine Golgi uptake, with no influence on the UDP-galactose transport activity. Further studies demonstrated that SLC35A5 localized exclusively to the Golgi apparatus. Careful insight into the protein sequence revealed that the C-terminus of this protein is extremely acidic and contains distinctive motifs, namely DXEE, DXD, and DXXD. Our studies show that the C-terminus is directed toward the cytosol. We also demonstrated that SLC35A5 formed homomers, as well as heteromers with other members of the SLC35A protein subfamily. In conclusion, the SLC35A5 protein might be a Golgi-resident multiprotein complex member engaged in nucleotide sugar transport.
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Affiliation(s)
- Paulina Sosicka
- Faculty of Biotechnology, University of Wroclaw, 14A F. Joliot-Curie St., 50-383 Wroclaw, Poland.
- Human Genetics Program, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA.
| | - Bożena Bazan
- Faculty of Biotechnology, University of Wroclaw, 14A F. Joliot-Curie St., 50-383 Wroclaw, Poland.
| | - Dorota Maszczak-Seneczko
- Faculty of Biotechnology, University of Wroclaw, 14A F. Joliot-Curie St., 50-383 Wroclaw, Poland.
| | - Yauhen Shauchuk
- Faculty of Biotechnology, University of Wroclaw, 14A F. Joliot-Curie St., 50-383 Wroclaw, Poland.
| | - Teresa Olczak
- Faculty of Biotechnology, University of Wroclaw, 14A F. Joliot-Curie St., 50-383 Wroclaw, Poland.
| | - Mariusz Olczak
- Faculty of Biotechnology, University of Wroclaw, 14A F. Joliot-Curie St., 50-383 Wroclaw, Poland.
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Chim-ong A, Thawornkuno C, Chavalitshewinkoon-Petmitr P, Punyarit P, Petmitr S. SLC35B2 expression is associated with a poor prognosis of invasive ductal breast carcinoma. Asian Pac J Cancer Prev 2017; 15:6065-70. [PMID: 25124574 DOI: 10.7314/apjcp.2014.15.15.6065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Breast cancer is the most common malignancy in women worldwide, including Thailand, and is a major cause of mortality and morbidity, despite advances in diagnosis and treatment. Novel gene expression in breast cancer is a focus in searches for prognostic biomarkers and new therapeutic targets. MATERIALS AND METHODS The mRNA expression of novel B4GALT4, SLC35B2, and WDHD1 genes in breast cancer were examined in invasive ductal breast carcinoma (IDC) patients using quantitative real-time reverse transcription polymerase chain reaction (QRT-PCR). RESULTS Among these genes, increased expression of SLC35B2 mRNA was significantly associated with TNM stage III+IV of IDC (p<0.001). Hence, up-regulation of SLC35B2 may serve as a prognostic biomarker for poor prognosis, and is also a potential therapeutic target in breast cancer.
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Affiliation(s)
- Anongruk Chim-ong
- Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand E-mail :
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Blondel CJ, Park JS, Hubbard TP, Pacheco AR, Kuehl CJ, Walsh MJ, Davis BM, Gewurz BE, Doench JG, Waldor MK. CRISPR/Cas9 Screens Reveal Requirements for Host Cell Sulfation and Fucosylation in Bacterial Type III Secretion System-Mediated Cytotoxicity. Cell Host Microbe 2016; 20:226-37. [PMID: 27453484 DOI: 10.1016/j.chom.2016.06.010] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 05/24/2016] [Accepted: 06/17/2016] [Indexed: 12/11/2022]
Abstract
Type III secretion systems (T3SSs) inject bacterial effector proteins into host cells and underlie the virulence of many gram-negative pathogens. Studies have illuminated bacterial factors required for T3SS function, but the required host processes remain largely undefined. We coupled CRISPR/Cas9 genome editing technology with the cytotoxicity of two Vibrio parahaemolyticus T3SSs (T3SS1 and T3SS2) to identify human genome disruptions conferring resistance to T3SS-dependent cytotoxicity. We identity non-overlapping genes required for T3SS1- and T3SS2-mediated cytotoxicity. Genetic ablation of cell surface sulfation reduces bacterial adhesion and thereby alters the kinetics of T3SS1-mediated cytotoxicity. Cell surface fucosylation is required for T3SS2-dependent killing, and genetic inhibition of fucosylation prevents membrane insertion of the T3SS2 translocon complex. These findings reveal the importance of ubiquitous surface modifications for T3SS function, potentially explaining the broad tropism of V. parahaemolyticus, and highlight the utility of genome-wide CRISPR/Cas9 screens to discover processes underlying host-pathogen interactions.
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Affiliation(s)
- Carlos J Blondel
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA 02115, USA; Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA
| | - Joseph S Park
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA 02115, USA; Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA; Howard Hughes Medical Institute, Boston, MA 02115, USA; Boston University School of Medicine, Boston, MA 02118, USA
| | - Troy P Hubbard
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA 02115, USA; Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA
| | - Alline R Pacheco
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA 02115, USA; Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA
| | - Carole J Kuehl
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA 02115, USA; Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA
| | - Michael J Walsh
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA 02115, USA; Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA
| | - Brigid M Davis
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA 02115, USA; Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA
| | - Benjamin E Gewurz
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA 02115, USA; Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA
| | - John G Doench
- Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Matthew K Waldor
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA 02115, USA; Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA; Howard Hughes Medical Institute, Boston, MA 02115, USA.
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11
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Lee NS, Evgrafov OV, Souaiaia T, Bonyad A, Herstein J, Lee JY, Kim J, Ning Y, Sixto M, Weitz AC, Lenz HJ, Wang K, Knowles JA, Press MF, Salvaterra PM, Shung KK, Chow RH. Non-coding RNAs derived from an alternatively spliced REST transcript (REST-003) regulate breast cancer invasiveness. Sci Rep 2015; 5:11207. [PMID: 26053433 PMCID: PMC4459148 DOI: 10.1038/srep11207] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 04/17/2015] [Indexed: 11/29/2022] Open
Abstract
RE1-Silencing Transcription factor (REST) has a well-established role in regulating transcription of genes important for neuronal development. Its role in cancer, though significant, is less well understood. We show that REST downregulation in weakly invasive MCF-7 breast cancer cells converts them to a more invasive phenotype, while REST overexpression in highly invasive MDA-MB-231 cells suppresses invasiveness. Surprisingly, the mechanism responsible for these phenotypic changes does not depend directly on the transcriptional function of REST protein. Instead, it is driven by previously unstudied mid-size (30–200 nt) non-coding RNAs (ncRNAs) derived from the first exon of an alternatively spliced REST transcript: REST-003. We show that processing of REST-003 into ncRNAs is controlled by an uncharacterized serine/arginine repeat-related protein, SRRM3. SRRM3 expression may be under REST-mediated transcriptional control, as it increases following REST downregulation. The SRRM3-dependent regulation of REST-003 processing into ncRNAs has many similarities to recently described promoter-associated small RNA-like processes. Targeting ncRNAs that control invasiveness could lead to new therapeutic approaches to limit breast cancer metastasis.
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Affiliation(s)
- Nan Sook Lee
- 1] Physiology &Biophysics and Zilkha Neurogenetic Institute, University of Southern California, Los Angeles [2] Dept of Biomedical Engineering, University of Southern California, Los Angeles
| | - Oleg V Evgrafov
- Psychiatry &the Behavioral Sciences, University of Southern California, Los Angeles
| | - Tade Souaiaia
- Psychiatry &the Behavioral Sciences, University of Southern California, Los Angeles
| | - Adrineh Bonyad
- Physiology &Biophysics and Zilkha Neurogenetic Institute, University of Southern California, Los Angeles
| | - Jennifer Herstein
- Psychiatry &the Behavioral Sciences, University of Southern California, Los Angeles
| | - Joo Yeun Lee
- Neuroscience Graduate Program, University of Southern California, Los Angeles
| | - Jihong Kim
- Psychiatry &the Behavioral Sciences, University of Southern California, Los Angeles
| | - Yan Ning
- Dept of Medicine, Norris Cancer Center, University of Southern California, Los Angeles
| | | | - Andrew C Weitz
- Dept of Ophthalmology, University of Southern California, Los Angeles, CA
| | - Heinz-Josef Lenz
- Dept of Medicine, Norris Cancer Center, University of Southern California, Los Angeles
| | - Kai Wang
- Psychiatry &the Behavioral Sciences, University of Southern California, Los Angeles
| | - James A Knowles
- Psychiatry &the Behavioral Sciences, University of Southern California, Los Angeles
| | - Michael F Press
- Dept of Pathology, Norris Cancer Center, University of Southern California, Los Angeles
| | - Paul M Salvaterra
- Department of Neuroscience, Beckman Research Institute of the City of Hope, Duarte, CA
| | - K Kirk Shung
- Dept of Biomedical Engineering, University of Southern California, Los Angeles
| | - Robert H Chow
- Physiology &Biophysics and Zilkha Neurogenetic Institute, University of Southern California, Los Angeles
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12
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Xu Q, Pan Y, Li L, Zhou Z, Huang Q, Pang JC, Zhu X, Ren Y, Yang H, Ohgaki H, Lv S. MiR-22 is frequently downregulated in medulloblastomas and inhibits cell proliferation via the novel target PAPST1. Brain Pathol 2014; 24:568-83. [PMID: 24576181 PMCID: PMC8029063 DOI: 10.1111/bpa.12136] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Accepted: 02/25/2014] [Indexed: 01/05/2023] Open
Abstract
Medulloblastoma is the most frequent malignant central nervous system tumor in children. MicroRNAs (miRs) are small, non-coding RNAs that target protein-coding and non-coding RNAs, and play roles in a variety of cellular processes through regulation of multiple targets. In the present study, we analyzed miR-22 expression and its effect in cell proliferation and apoptosis in medulloblastomas. Quantitative reverse transcription PCR (RT-PCR) revealed significantly lower expression of miR-22 in 19 out of 27 (70%) medulloblastomas, D341, DAOY, ONS-76 medulloblastoma cell lines, compared with normal cerebellum. Forced expression of miR-22 by lentiviral vector transfection reduced cell proliferation and induced apoptosis, while knockdown of miR-22 increased proliferative activity in DAOY and ONS-76 cells. DAOY cells with miR-22 overexpression in nude mice yielded tumors smaller than those originated from control DAOY cells. Microarray analysis in DAOY cells with forced miR-22 expression showed significant changes in expression profiles, PAPST1 being the most significantly (10 folds) downregulated gene. Quantitative RT-PCR revealed PAPST1 mRNA upregulation in 18 out of 27 (67%) medulloblastomas. In addition, a luciferase reporter assay in ONS-76 and DAOY cells suggested that miR-22 directly targets the PAPST1 gene, and lentivirus-mediated knockdown of PAPST1 suppressed proliferation of DAOY and ONS-76 medulloblastoma cells. These results suggest that frequently downregulated miR-22 expression is associated with cell proliferation in medulloblastomas, and this may be at least in part via PAPST1, which is a novel target of miR-22.
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Affiliation(s)
- Qing‐Fu Xu
- Department of NeurosurgeryXinqiao HospitalThird Military Medical UniversityChongqingChina
| | - Ya‐Wen Pan
- Department of NeurosurgeryThe Second HospitalLanzhou UniversityLanzhouChina
| | - Li‐Chao Li
- Department of NeurosurgeryThe First HospitalLanzhou UniversityLanzhouChina
| | - Zheng Zhou
- Department of NeurosurgeryXinqiao HospitalThird Military Medical UniversityChongqingChina
| | - Qi‐Lin Huang
- Department of NeurosurgeryXinqiao HospitalThird Military Medical UniversityChongqingChina
| | - Jesse Chung‐sean Pang
- Department of Anatomical and Cellular PathologyThe Chinese University of Hong KongHong Kong
| | - Xiao‐Peng Zhu
- Department of NeurosurgeryXinqiao HospitalThird Military Medical UniversityChongqingChina
| | - Yong Ren
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalThird Military Medical UniversityChongqingChina
| | - Hui Yang
- Department of NeurosurgeryXinqiao HospitalThird Military Medical UniversityChongqingChina
| | - Hiroko Ohgaki
- Section of Molecular PathologyInternational Agency for Research on CancerLyonFrance
| | - Sheng‐Qing Lv
- Department of NeurosurgeryXinqiao HospitalThird Military Medical UniversityChongqingChina
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13
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Dick G, Akslen-Hoel LK, Grøndahl F, Kjos I, Maccarana M, Prydz K. PAPST1 regulates sulfation of heparan sulfate proteoglycans in epithelial MDCK II cells. Glycobiology 2014; 25:30-41. [PMID: 25138304 DOI: 10.1093/glycob/cwu084] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Proteoglycan (PG) sulfation depends on activated nucleotide sulfate, 3'-phosphoadenosine-5'-phosphosulfate (PAPS). Transporters in the Golgi membrane translocate PAPS from the cytoplasm into the organelle lumen where PG sulfation occurs. Silencing of PAPS transporter (PAPST) 1 in epithelial MDCK cells reduced PAPS uptake into Golgi vesicles. Surprisingly, at the same time sulfation of heparan sulfate (HS) was stimulated. The effect was pathway specific in polarized epithelial cells. Basolaterally secreted proteoglycans (PGs) displayed an altered HS sulfation pattern and increased growth factor binding capacity. In contrast, the sulfation pattern of apically secreted PGs was unchanged while the secretion was reduced. Regulation of PAPST1 allows epithelial cells to prioritize between PG sulfation in the apical and basolateral secretory routes at the level of the Golgi apparatus. This provides sulfation patterns that ensure PG functions at the extracellular level, such as growth factor binding.
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Affiliation(s)
- Gunnar Dick
- Department of Biosciences, University of Oslo, PO Box 1066, 0316 Oslo, Norway
| | | | - Frøy Grøndahl
- Department of Biosciences, University of Oslo, PO Box 1066, 0316 Oslo, Norway
| | - Ingrid Kjos
- Department of Biosciences, University of Oslo, PO Box 1066, 0316 Oslo, Norway
| | - Marco Maccarana
- Department of Experimental Medical Science, Lund University, 221 00 Lund, Sweden
| | - Kristian Prydz
- Department of Biosciences, University of Oslo, PO Box 1066, 0316 Oslo, Norway
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14
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Hadley B, Maggioni A, Ashikov A, Day CJ, Haselhorst T, Tiralongo J. Structure and function of nucleotide sugar transporters: Current progress. Comput Struct Biotechnol J 2014; 10:23-32. [PMID: 25210595 PMCID: PMC4151994 DOI: 10.1016/j.csbj.2014.05.003] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The proteomes of eukaryotes, bacteria and archaea are highly diverse due, in part, to the complex post-translational modification of protein glycosylation. The diversity of glycosylation in eukaryotes is reliant on nucleotide sugar transporters to translocate specific nucleotide sugars that are synthesised in the cytosol and nucleus, into the endoplasmic reticulum and Golgi apparatus where glycosylation reactions occur. Thirty years of research utilising multidisciplinary approaches has contributed to our current understanding of NST function and structure. In this review, the structure and function, with reference to various disease states, of several NSTs including the UDP-galactose, UDP-N-acetylglucosamine, UDP-N-acetylgalactosamine, GDP-fucose, UDP-N-acetylglucosamine/UDP-glucose/GDP-mannose and CMP-sialic acid transporters will be described. Little is known regarding the exact structure of NSTs due to difficulties associated with crystallising membrane proteins. To date, no three-dimensional structure of any NST has been elucidated. What is known is based on computer predictions, mutagenesis experiments, epitope-tagging studies, in-vitro assays and phylogenetic analysis. In this regard the best-characterised NST to date is the CMP-sialic acid transporter (CST). Therefore in this review we will provide the current state-of-play with respect to the structure–function relationship of the (CST). In particular we have summarised work performed by a number groups detailing the affect of various mutations on CST transport activity, efficiency, and substrate specificity.
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Affiliation(s)
- Barbara Hadley
- Institute for Glycomics, Griffith University, Gold Coast Campus, Queensland 4222, Australia
| | - Andrea Maggioni
- Institute for Glycomics, Griffith University, Gold Coast Campus, Queensland 4222, Australia
| | - Angel Ashikov
- Institut für Zelluläre Chemie, Zentrum Biochemie, Medizinische Hochschule Hannover, Carl-Neuberg Strasse 1, 30625 Hannover, Germany ; Laboratory of Genetic, Endocrine and Metabolic Diseases, Department of Neurology, Radboud University Medical Center, Geert Grooteplein Zuid 10 (route 830), Nijmegen, The Netherlands
| | - Christopher J Day
- Institute for Glycomics, Griffith University, Gold Coast Campus, Queensland 4222, Australia
| | - Thomas Haselhorst
- Institute for Glycomics, Griffith University, Gold Coast Campus, Queensland 4222, Australia
| | - Joe Tiralongo
- Institute for Glycomics, Griffith University, Gold Coast Campus, Queensland 4222, Australia
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15
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Whittamore JM, Freel RW, Hatch M. Sulfate secretion and chloride absorption are mediated by the anion exchanger DRA (Slc26a3) in the mouse cecum. Am J Physiol Gastrointest Liver Physiol 2013; 305:G172-84. [PMID: 23660504 PMCID: PMC3725685 DOI: 10.1152/ajpgi.00084.2013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Inorganic sulfate (SO₄²⁻) is essential for a multitude of physiological processes. The specific molecular pathway has been identified for uptake from the small intestine but is virtually unknown for the large bowel, although there is evidence for absorption involving Na⁺-independent anion exchange. A leading candidate is the apical chloride/bicarbonate (Cl⁻/HCO₃⁻) exchanger DRA (down-regulated in adenoma; Slc26a3), primarily linked to the Cl⁻ transporting defect in congenital chloride diarrhea. The present study set out to characterize transepithelial ³⁵SO₄²⁻ and ³⁶Cl⁻ fluxes across the isolated, short-circuited cecum from wild-type (WT) and knockout (KO) mice and subsequently to define the contribution of DRA. The cecum demonstrated simultaneous net SO₄²⁻ secretion (-8.39 ± 0.88 nmol·cm⁻²·h⁻¹) and Cl⁻ absorption (10.85 ± 1.41 μmol·cm⁻²·h⁻¹). In DRA-KO mice, SO₄²⁻ secretion was reversed to net absorption via a 60% reduction in serosal to mucosal SO₄²⁻ flux. Similarly, net Cl⁻ absorption was abolished and replaced by secretion, indicating that DRA represents a major pathway for transcellular SO₄²⁻ secretion and Cl⁻ absorption. Further experiments including the application of DIDS (500 μM), bumetanide (100 μM), and substitutions of extracellular Cl⁻ or HCO₃⁻/CO₂ helped to identify specific ion dependencies and driving forces and suggested that additional anion exchangers were operating at both apical and basolateral membranes supporting SO₄²⁻ transport. In conclusion, DRA contributes to SO₄²⁻ secretion via DIDS-sensitive HCO₃⁻/SO₄²⁻ exchange, in addition to being the principal DIDS-resistant Cl⁻/HCO₃⁻ exchanger. With DRA linked to the pathogenesis of other gastrointestinal diseases extending its functional characterization offers a more complete picture of its role in the intestine.
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Affiliation(s)
- Jonathan M. Whittamore
- Department of Pathology, Immunology and Laboratory Science, College of Medicine, University of Florida, Gainesville, Florida
| | - Robert W. Freel
- Department of Pathology, Immunology and Laboratory Science, College of Medicine, University of Florida, Gainesville, Florida
| | - Marguerite Hatch
- Department of Pathology, Immunology and Laboratory Science, College of Medicine, University of Florida, Gainesville, Florida
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16
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Nakayama F, Umeda S, Ichimiya T, Kamiyama S, Hazawa M, Yasuda T, Nishihara S, Imai T. Sulfation of keratan sulfate proteoglycan reduces radiation-induced apoptosis in human Burkitt's lymphoma cell lines. FEBS Lett 2012; 587:231-7. [DOI: 10.1016/j.febslet.2012.12.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Revised: 10/18/2012] [Accepted: 12/03/2012] [Indexed: 10/27/2022]
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17
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Gregersen LH, Jacobsen A, Frankel LB, Wen J, Krogh A, Lund AH. MicroRNA-143 down-regulates Hexokinase 2 in colon cancer cells. BMC Cancer 2012; 12:232. [PMID: 22691140 PMCID: PMC3480834 DOI: 10.1186/1471-2407-12-232] [Citation(s) in RCA: 112] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Accepted: 05/15/2012] [Indexed: 12/19/2022] Open
Abstract
Background MicroRNAs (miRNAs) are well recognized as gene regulators and have been implicated in the regulation of development as well as human diseases. miR-143 is located at a fragile site on chromosome 5 frequently deleted in cancer, and has been reported to be down-regulated in several cancers including colon cancer. Methods To gain insight into the role of miR-143 in colon cancer, we used a microarray-based approach in combination with seed site enrichment analysis to identify miR-143 targets. Results As expected, transcripts down-regulated upon miR-143 overexpression had a significant enrichment of miR-143 seed sites in their 3'UTRs. Here we report the identification of Hexokinase 2 (HK2) as a direct target of miR-143. We show that re-introduction of miR-143 in the colon cancer cell line DLD-1 results in a decreased lactate secretion. Conclusion We have identified and validated HK2 as a miR-143 target. Furthermore, our results indicate that miR-143 mediated down-regulation of HK2 affects glucose metabolism in colon cancer cells. We hypothesize that loss of miR-143-mediated repression of HK2 can promote glucose metabolism in cancer cells, contributing to the shift towards aerobic glycolysis observed in many tumors.
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Affiliation(s)
- Lea H Gregersen
- Biotech Research and Innovation Centre and Centre for Epigenetics, University of Copenhagen, DK-2200, Copenhagen N, Denmark
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18
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Attachment of Chlamydia trachomatis L2 to host cells requires sulfation. Proc Natl Acad Sci U S A 2012; 109:10059-64. [PMID: 22675117 DOI: 10.1073/pnas.1120244109] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Chlamydia trachomatis is a pathogen responsible for a prevalent sexually transmitted disease. It is also the most common cause of infectious blindness in the developing world. We performed a loss-of-function genetic screen in human haploid cells to identify host factors important in C. trachomatis L2 infection. We identified and confirmed B3GAT3, B4GALT7, and SLC35B2, which encode glucuronosyltransferase I, galactosyltransferase I, and the 3'-phosphoadenosine 5'-phosphosulfate transporter 1, respectively, as important in facilitating Chlamydia infection. Knockout of any of these three genes inhibits Chlamydia attachment. In complementation studies, we found that the introduction of functional copies of these three genes into the null clones restored full susceptibility to Chlamydia infection. The degree of attachment of Chlamydia strongly correlates with the level of sulfation of the host cell, not simply with the amount of heparan sulfate. Thus, other, as-yet unidentified sulfated macromolecules must contribute to infection. These results demonstrate the utility of screens in haploid cells to study interactions of human cells with bacteria. Furthermore, the human null clones generated can be used to investigate the role of heparan sulfate and sulfation in other settings not limited to infectious disease.
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