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Mackinder JR, Hinkel LA, Schutz K, Eckstrom K, Fisher K, Wargo MJ. Sphingosine induction of the Pseudomonas aeruginosa hemolytic phospholipase C/sphingomyelinase (PlcH). J Bacteriol 2024; 206:e0038223. [PMID: 38411048 PMCID: PMC10955842 DOI: 10.1128/jb.00382-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Accepted: 02/01/2024] [Indexed: 02/28/2024] Open
Abstract
Hemolytic phospholipase C, PlcH, is an important virulence factor for Pseudomonas aeruginosa. PlcH preferentially hydrolyzes sphingomyelin and phosphatidylcholine, and this hydrolysis activity drives tissue damage and inflammation and interferes with the oxidative burst of immune cells. Among other contributors, transcription of plcH was previously shown to be induced by phosphate starvation via PhoB and the choline metabolite, glycine betaine, via GbdR. Here, we show that sphingosine can induce plcH transcription and result in secreted PlcH enzyme activity. This induction is dependent on the sphingosine-sensing transcriptional regulator SphR. The SphR induction of plcH occurs from the promoter for the gene upstream of plcH that encodes the neutral ceramidase, CerN, and transcriptional readthrough of the cerN transcription terminator. Evidence for these conclusions came from mutation of the SphR binding site in the cerN promoter, mutation of the cerN terminator, enhancement of cerN termination by adding the rrnB terminator, and reverse transcriptase PCR (RT-PCR) showing that the intergenic region between cerN and plcH is made as RNA during sphingosine, but not choline, induction. We also observed that, like glycine betaine induction, sphingosine induction of plcH is under catabolite repression control, which likely explains why such induction was not seen in other studies using sphingosine in rich media. The addition of sphingosine as a novel inducer for PlcH points to the regulation of plcH transcription as a site for the integration of multiple host-derived signals. IMPORTANCE PlcH is a secreted phospholipase C/sphingomyelinase that is important for the virulence of Pseudomonas aeruginosa. Here, we show that sphingosine, which presents itself or as a product of P. aeruginosa sphingomyelinase and ceramidase activity, leads to the induction of plcH transcription. This transcriptional induction occurs from the promoter of the upstream ceramidase gene generating a conditional operon. The transcript on which plcH resides, therefore, is different depending on which host molecule or condition leads to induction, and this may have implications for PlcH post-transcriptional regulation. This work also adds to our understanding of P. aeruginosa with host-derived sphingolipids.
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Affiliation(s)
- Jacob R. Mackinder
- Department of Microbiology and Molecular Genetics, Larner College of Medicine, University of Vermont, Burlington, Vermont, USA
- Cellular, Molecular, and Biomedical Sciences Graduate Program, University of Vermont, Burlington, Vermont, USA
| | - Lauren A. Hinkel
- Department of Microbiology and Molecular Genetics, Larner College of Medicine, University of Vermont, Burlington, Vermont, USA
- Cellular, Molecular, and Biomedical Sciences Graduate Program, University of Vermont, Burlington, Vermont, USA
| | - Kristin Schutz
- Department of Microbiology and Molecular Genetics, Larner College of Medicine, University of Vermont, Burlington, Vermont, USA
| | - Korin Eckstrom
- Department of Microbiology and Molecular Genetics, Larner College of Medicine, University of Vermont, Burlington, Vermont, USA
| | - Kira Fisher
- Department of Microbiology and Molecular Genetics, Larner College of Medicine, University of Vermont, Burlington, Vermont, USA
| | - Matthew J. Wargo
- Department of Microbiology and Molecular Genetics, Larner College of Medicine, University of Vermont, Burlington, Vermont, USA
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Martin CE, Murray AS, Mackinder JR, Sala-Hamrick KE, Flynn MG, Lundgren JG, Varela FA, List K. TMPRSS13 zymogen activation, surface localization, and shedding is regulated by proteolytic cleavage within the non-catalytic stem region. Biol Chem 2022; 403:969-982. [PMID: 35796294 PMCID: PMC10642292 DOI: 10.1515/hsz-2022-0129] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 05/24/2022] [Indexed: 12/21/2022]
Abstract
TMPRSS13 is a member of the type II transmembrane serine protease (TTSP) family. Here we characterize a novel post-translational mechanism important for TMPRSS13 function: proteolytic cleavage within the extracellular TMPRSS13 stem region located between the transmembrane domain and the first site of N-linked glycosylation at asparagine (N)-250 in the scavenger receptor cysteine rich (SRCR) domain. Importantly, the catalytic competence of TMPRSS13 is essential for stem region cleavage, suggesting an autonomous mechanism of action. Site-directed mutagenesis of the 10 basic amino acids (four arginine and six lysine residues) in this region abrogated zymogen activation and catalytic activity of TMPRSS13, as well as phosphorylation, cell surface expression, and shedding. Mutation analysis of individual arginine residues identified R223, a residue located between the low-density lipoprotein receptor class A domain and the SRCR domain, as important for stem region cleavage. Mutation of R223 causes a reduction in the aforementioned functional processing steps of TMPRSS13. These data provide further insight into the roles of different post-translational modifications as regulators of the function and localization of TMPRSS13. Additionally, the data suggest the presence of complex interconnected regulatory mechanisms that may serve to ensure the proper levels of cell-surface and pericellular TMPRSS13-mediated proteolysis under homeostatic conditions.
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Affiliation(s)
- Carly E. Martin
- Department of Pharmacology, Wayne State University, Detroit, MI, 48202, USA
- Department of Oncology, Wayne State University, Detroit, MI, 48202, USA
| | - Andrew S. Murray
- Department of Pharmacology, Wayne State University, Detroit, MI, 48202, USA
- Department of Oncology, Wayne State University, Detroit, MI, 48202, USA
- Division of Hematological Malignancies and Cellular Therapy, Duke University, Durham, NC, 27708, USA
| | - Jacob R. Mackinder
- Department of Pharmacology, Wayne State University, Detroit, MI, 48202, USA
- Department of Microbiology and Molecular Genetics, University of Vermont, Burlington, VT, 05405, USA
| | - Kimberley E. Sala-Hamrick
- Department of Pharmacology, Wayne State University, Detroit, MI, 48202, USA
- Department of Environmental Sciences, University of Michigan School of Public Health, Ann Arbor, MI, 48109, USA
| | - Michael G. Flynn
- Department of Pharmacology, Wayne State University, Detroit, MI, 48202, USA
| | - Joseph G. Lundgren
- Department of Pharmacology, Wayne State University, Detroit, MI, 48202, USA
- Department of Oncology, Wayne State University, Detroit, MI, 48202, USA
| | - Fausto A. Varela
- Department of Pharmacology, Wayne State University, Detroit, MI, 48202, USA
- Department of Biochemistry and Molecular Biology, University of Kansas Medical Center, Kansas City, KS, 66160, USA
| | - Karin List
- Department of Pharmacology, Wayne State University, Detroit, MI, 48202, USA
- Department of Oncology, Wayne State University, Detroit, MI, 48202, USA
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Martin CE, Murray AS, Sala-Hamrick KE, Mackinder JR, Harrison EC, Lundgren JG, Varela FA, List K. Posttranslational modifications of serine protease TMPRSS13 regulate zymogen activation, proteolytic activity, and cell surface localization. J Biol Chem 2021; 297:101227. [PMID: 34562451 PMCID: PMC8503615 DOI: 10.1016/j.jbc.2021.101227] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 09/17/2021] [Accepted: 09/21/2021] [Indexed: 12/01/2022] Open
Abstract
TMPRSS13, a member of the type II transmembrane serine protease (TTSP) family, harbors four N-linked glycosylation sites in its extracellular domain. Two of the glycosylated residues are located in the scavenger receptor cysteine-rich (SRCR) protein domain, while the remaining two sites are in the catalytic serine protease (SP) domain. In this study, we examined the role of N-linked glycosylation in the proteolytic activity, autoactivation, and cellular localization of TMPRSS13. Individual and combinatory site-directed mutagenesis of the glycosylated asparagine residues indicated that glycosylation of the SP domain is critical for TMPRSS13 autoactivation and catalytic activity toward one of its protein substrates, the prostasin zymogen. Additionally, SP domain glycosylation-deficient TMPRSS13 displayed impaired trafficking of TMPRSS13 to the cell surface, which correlated with increased retention in the endoplasmic reticulum. Importantly, we showed that N-linked glycosylation was a critical determinant for subsequent phosphorylation of endogenous TMPRSS13. Taken together, we conclude that glycosylation plays an important role in regulating TMPRSS13 activation and activity, phosphorylation, and cell surface localization.
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Affiliation(s)
- Carly E Martin
- Department of Pharmacology, Wayne State University, Detroit, Michigan, USA; Department of Oncology, Wayne State University, Detroit, Michigan, USA
| | - Andrew S Murray
- Department of Pharmacology, Wayne State University, Detroit, Michigan, USA; Department of Oncology, Wayne State University, Detroit, Michigan, USA; Division of Hematological Malignancies and Cellular Therapy, Duke University, Durham, North Carolina, USA
| | | | - Jacob R Mackinder
- Department of Pharmacology, Wayne State University, Detroit, Michigan, USA
| | - Evan C Harrison
- Department of Pharmacology, Wayne State University, Detroit, Michigan, USA
| | - Joseph G Lundgren
- Department of Pharmacology, Wayne State University, Detroit, Michigan, USA; Department of Oncology, Wayne State University, Detroit, Michigan, USA
| | - Fausto A Varela
- Department of Pharmacology, Wayne State University, Detroit, Michigan, USA; Department of Biochemistry and Molecular Biology, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Karin List
- Department of Pharmacology, Wayne State University, Detroit, Michigan, USA; Department of Oncology, Wayne State University, Detroit, Michigan, USA.
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Murray AS, Hyland TE, Sala-Hamrick KE, Mackinder JR, Martin CE, Tanabe LM, Varela FA, List K. The cell-surface anchored serine protease TMPRSS13 promotes breast cancer progression and resistance to chemotherapy. Oncogene 2020; 39:6421-6436. [PMID: 32868877 DOI: 10.1038/s41388-020-01436-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 08/08/2020] [Accepted: 08/17/2020] [Indexed: 12/18/2022]
Abstract
Breast cancer progression is accompanied by increased expression of extracellular and cell-surface proteases capable of degrading the extracellular matrix as well as cleaving and activating downstream targets. The type II transmembrane serine proteases (TTSPs) are a family of cell-surface proteases that play critical roles in numerous types of cancers. Therefore, the aim of this study was to identify novel and uncharacterized TTSPs with differential expression in breast cancer and to determine their potential roles in progression. Systematic in silico data analysis followed by immunohistochemical validation identified increased expression of the TTSP family member, TMPRSS13 (transmembrane protease, serine 13), in invasive ductal carcinoma patient tissue samples compared to normal breast tissue. To test whether loss of TMPRSS13 impacts tumor progression, TMPRSS13 was genetically ablated in the oncogene-induced transgenic MMTV-PymT tumor model. TMPRSS13 deficiency resulted in a significant decrease in overall tumor burden and growth rate, as well as a delayed formation of detectable mammary tumors, thus suggesting a causal relationship between TMPRSS13 expression and the progression of breast cancer. Complementary studies using human breast cancer cell culture models revealed that siRNA-mediated silencing of TMPRSS13 expression decreases proliferation, induces apoptosis, and attenuates invasion. Importantly, targeting TMPRSS13 expression renders aggressive triple-negative breast cancer cell lines highly responsive to chemotherapy. At the molecular level, knockdown of TMPRSS13 in breast cancer cells led to increased protein levels of the tumor-suppressive protease prostasin. TMPRSS13/prostasin co-immunoprecipitation and prostasin zymogen activation experiments identified prostasin as a potential novel target for TMPRSS13. Regulation of prostasin levels may be a mechanism that contributes to the pro-oncogenic properties of TMPRSS13 in breast cancer. TMPRSS13 represents a novel candidate for targeted therapy in combination with standard of care chemotherapy agents in patients with hormone receptor-negative breast cancer or in patients with tumors refractory to endocrine therapy.
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Affiliation(s)
- Andrew S Murray
- Department of Pharmacology, Wayne State University, Detroit, MI, USA.,Department of Oncology, Wayne State University, Detroit, MI, USA
| | - Thomas E Hyland
- Department of Pharmacology, Wayne State University, Detroit, MI, USA
| | | | - Jacob R Mackinder
- Department of Pharmacology, Wayne State University, Detroit, MI, USA
| | - Carly E Martin
- Department of Pharmacology, Wayne State University, Detroit, MI, USA.,Department of Oncology, Wayne State University, Detroit, MI, USA
| | - Lauren M Tanabe
- Department of Pharmacology, Wayne State University, Detroit, MI, USA
| | - Fausto A Varela
- Department of Pharmacology, Wayne State University, Detroit, MI, USA
| | - Karin List
- Department of Pharmacology, Wayne State University, Detroit, MI, USA. .,Department of Oncology, Wayne State University, Detroit, MI, USA.
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Varela FA, Foust VL, Hyland TE, Sala-Hamrick KE, Mackinder JR, Martin CE, Murray AS, Todi SV, List K. TMPRSS13 promotes cell survival, invasion, and resistance to drug-induced apoptosis in colorectal cancer. Sci Rep 2020; 10:13896. [PMID: 32807808 PMCID: PMC7431588 DOI: 10.1038/s41598-020-70636-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 07/09/2020] [Indexed: 12/17/2022] Open
Abstract
Cancer progression is often accompanied by increased levels of extracellular proteases capable of remodeling the extracellular matrix and promoting pro-cancerous signaling pathways by activating growth factors and receptors. The type II transmembrane serine protease (TTSP) family encompasses several proteases that play critical roles in cancer progression; however, the expression or function of the TTSP TMPRSS13 in carcinogenesis has not been examined. In the present study, we found TMPRSS13 to be differentially expressed at both the transcript and protein levels in human colorectal cancer (CRC). Immunohistochemical analyses revealed consistent high expression of TMPRSS13 protein on the cancer cell surface in CRC patient samples; in contrast, the majority of normal colon samples displayed no detectable expression. On a functional level, TMPRSS13 silencing in CRC cell lines increased apoptosis and impaired invasive potential. Importantly, transgenic overexpression of TMPRSS13 in CRC cell lines increased tolerance to apoptosis-inducing agents, including paclitaxel and HA14-1. Conversely, TMPRSS13 silencing rendered CRC cells more sensitive to these agents. Together, our findings suggest that TMPRSS13 plays an important role in CRC cell survival and in promoting resistance to drug-induced apoptosis; we also identify TMPRSS13 as a potential new target for monotherapy or combination therapy with established chemotherapeutics to improve treatment outcomes in CRC patients.
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Affiliation(s)
- Fausto A Varela
- Department of Pharmacology, Wayne State University School of Medicine, Detroit, 48201, MI, USA
| | - Victoria L Foust
- Department of Pharmacology, Wayne State University School of Medicine, Detroit, 48201, MI, USA
| | - Thomas E Hyland
- Department of Pharmacology, Wayne State University School of Medicine, Detroit, 48201, MI, USA
| | | | - Jacob R Mackinder
- Department of Pharmacology, Wayne State University School of Medicine, Detroit, 48201, MI, USA
| | - Carly E Martin
- Department of Pharmacology, Wayne State University School of Medicine, Detroit, 48201, MI, USA
- Department of Oncology, Wayne State University School of Medicine, Detroit, 48201, MI, USA
| | - Andrew S Murray
- Department of Pharmacology, Wayne State University School of Medicine, Detroit, 48201, MI, USA
- Department of Oncology, Wayne State University School of Medicine, Detroit, 48201, MI, USA
| | - Sokol V Todi
- Department of Pharmacology, Wayne State University School of Medicine, Detroit, 48201, MI, USA
- Department of Neurology, Wayne State University School of Medicine, Detroit, 48201, MI, USA
| | - Karin List
- Department of Pharmacology, Wayne State University School of Medicine, Detroit, 48201, MI, USA.
- Department of Oncology, Wayne State University School of Medicine, Detroit, 48201, MI, USA.
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