1
|
Complement and Fungal Dysbiosis as Prognostic Markers and Potential Targets in PDAC Treatment. Curr Oncol 2022; 29:9833-9854. [PMID: 36547187 PMCID: PMC9777542 DOI: 10.3390/curroncol29120773] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 12/02/2022] [Accepted: 12/09/2022] [Indexed: 12/23/2022] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is still hampered by a dismal prognosis. A better understanding of the tumor microenvironment within the pancreas and of the factors affecting its composition is of utmost importance for developing new diagnostic and treatment tools. In this context, the complement system plays a prominent role. Not only has it been shown to shape a T cell-mediated immune response, but it also directly affects proliferation and apoptosis of the tumor cells, influencing angiogenesis, metastatic spread and therapeutic resistance. This makes complement proteins appealing not only as early biomarkers of PDAC development, but also as therapeutic targets. Fungal dysbiosis is currently the new kid on the block in tumorigenesis with cancer-associated mycobiomes extracted from several cancer types. For PDAC, colonization with the yeast Malassezia seems to promote cancer progression, already in precursor lesions. One responsible mechanism appears to be complement activation via the lectin pathway. In the present article, we review the role of the complement system in tumorigenesis, presenting observations that propose it as the missing link between fungal dysbiosis and PDAC development. We also present the results of a small pilot study supporting the crucial interplay between the complement system and Malassezia colonization in PDAC pathogenesis.
Collapse
|
2
|
Suzuki T. Role of Glycoconjugates and Mammalian Sialidases Involved in Viral Infection and Neural Function. YAKUGAKU ZASSHI 2022; 142:381-388. [DOI: 10.1248/yakushi.21-00212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Takashi Suzuki
- School of Pharmaceutical Sciences, University of Shizuoka
| |
Collapse
|
3
|
Role of NEU3 Overexpression in the Prediction of Efficacy of EGFR-Targeted Therapies in Colon Cancer Cell Lines. Int J Mol Sci 2020; 21:ijms21228805. [PMID: 33233823 PMCID: PMC7699864 DOI: 10.3390/ijms21228805] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 11/18/2020] [Accepted: 11/19/2020] [Indexed: 12/12/2022] Open
Abstract
The epidermal growth factor receptor (EGFR), through the MAP kinase and PI3K-Akt-mTOR axis, plays a pivotal role in colorectal cancer (CRC) pathogenesis. The membrane-associated NEU3 sialidase interacts with and desialylates EGFR by promoting its dimerization and downstream effectors’ activation. Among the targeted therapies against EGFR, the monoclonal antibody cetuximab is active only in a subgroup of patients not carrying mutations in the MAP kinase pathway. In order to better understand the EGFR-NEU3 interplay and the mechanisms of pharmacological resistance, we investigated the role of NEU3 deregulation in cetuximab-treated CRC cell lines transiently transfected with NEU3 using Western blot analysis. Our results indicate that NEU3 overexpression can enhance EGFR activation only if EGFR is overexpressed, indicating the existence of a threshold for NEU3-mediated EGFR activation. This enhancement mainly leads to the constitutive activation of the MAP kinase pathway. Consequently, we suggest that the evaluation of NEU3 expression cannot entirely substitute the evaluation of EGFR because EGFR-negative cases cannot be stimulated by NEU3. Furthermore, NEU3-mediated hyperactivation of EGFR is counterbalanced by the administration of cetuximab, hypothesizing that a combined treatment of NEU3- and EGFR-targeted therapies may represent a valid option for CRC patients, which must be investigated in the future.
Collapse
|
4
|
Poznyak AV, Zhang D, Grechko AV, Wu WK, Orekhov AN. The role of sialic acids in the initiation of atherosclerosis. Minerva Cardioangiol 2020; 68:359-364. [PMID: 32472985 DOI: 10.23736/s0026-4725.20.05145-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Atherosclerosis is a major cause of disease-related mortality around the globe. The main characteristic of the disease is an accumulation of plaque on the arterial wall and subsequent erosion or rupture of some plaques. Atherosclerosis often leads to cardiovascular disease and such acute complications as myocardial infarction or ischemic stroke due to thrombus formation. Most recent advances in atherosclerotic research state that the modifications of low-density lipoprotein (LDL) are one of the most significant stages in the disease initiation, and among these modifications desialylation is of particular interest. Sialic acids are widely expressed on all types of cells of many organisms and participate in numerous biological processes. Regarding atherosclerosis, sialidases that are responsible for the regulation of the sialic component of different molecules, are probably one of the most crucial enzymatic families. Sufficient sialylation of vascular endothelium defines its susceptibility to an atherogenic plaque formation. Moreover, the desialylation of LDL provokes an accumulation of cholesterol and lipids in the arterial walls. According to the multiple involvements of sialic acids and related enzymes, sialidases, in the initiation and development of atherosclerosis, the deeper understanding of their exact role, as well as cellular and molecular mechanisms, will allow creating more targeted and effective therapeutic and diagnostic approaches.
Collapse
Affiliation(s)
- Anastasia V Poznyak
- Institute for Atherosclerosis Research, Skolkovo Innovative Center, Moscow, Russia
| | - Dongwei Zhang
- Diabetes Research Center, Traditional Chinese Medicine School, Beijing University of Chinese Medicine, Beijing, China
| | - Andrey V Grechko
- Federal Research and Clinical Center of Intensive Care Medicine and Rehabilitation, Moscow, Russia
| | - Wei-Kai Wu
- Department of Internal Medicine, National Taiwan University Hospital, Bei-Hu Branch, Taipei, Taiwan
| | - Alexander N Orekhov
- Institute for Atherosclerosis Research, Skolkovo Innovative Center, Moscow, Russia - .,Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, Moscow, Russia.,Institute of Human Morphology, Moscow, Russia
| |
Collapse
|
5
|
Wattanavises S, Silsirivanit A, Sawanyawisuth K, Cha’on U, Waraasawapati S, Saentaweesuk W, Luang S, Chalermwat C, Wongkham C, Wongkham S. Increase of MAL-II Binding Alpha2,3-Sialylated Glycan Is Associated with 5-FU Resistance and Short Survival of Cholangiocarcinoma Patients. ACTA ACUST UNITED AC 2019; 55:medicina55120761. [PMID: 31795149 PMCID: PMC6956088 DOI: 10.3390/medicina55120761] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2019] [Revised: 11/22/2019] [Accepted: 11/24/2019] [Indexed: 01/20/2023]
Abstract
Background and objectives: Sialylation plays important roles in tumor progression. Our present study aimed to demonstrate the alteration of sialylation and its role in cholangiocarcinoma (CCA). Materials and Methods: The α2,3- and α2,6-sialylation in CCA tissue was analyzed by lectin-histochemistry using Maackia amurensis lectin-II (MAL-II) and Sambucus nigra agglutinin (SNA). CCA cell lines were treated with the pan-sialylation inhibitor 3Fax-peracetyl-Neu5Ac (3F-Sia) followed by proliferation and chemosensitivity assays. Results: MAL-II binding α2,3-Sialylated Glycan (MAL-SG) and SNA binding α2,6-Sialylated Glycan (SNA-SG) were both elevated in CCA compared with hyperplastic/dysplastic (HP/DP) and normal bile ducts (NBD). The positive staining for MAL-SG or SNA-SG were found in 82% (61/74) of the CCA cases. Higher expression of MAL-SG in CCA was associated with shorter survival of the patients. The median survival of patients with high and low MAL-SG were 167 and 308 days, respectively, with overall survival of 233 days, suggesting the involvement of MAL-SG in CCA progression. MAL-SG expression of CCA cell lines was markedly decreased after treatment with 3F-Sia for 48 to 72 h. While proliferation of CCA cells were not affected by 3F-Sia treatment, their susceptibility to 5-fluorouracil (5-FU) was significantly enhanced. These results suggest that sialylation is involved in the development of 5-FU resistance and the sialylation inhibitor 3F-Sia can be used as a chemosensitizer for CCA. Conclusions: Sialylation is critically involved in the development of chemoresistance of CCA, and sialylation inhibitors may be used as a chemosensitizer in CCA treatment.
Collapse
Affiliation(s)
- Sasiprapa Wattanavises
- Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (S.W.); (K.S.); (U.C.); (S.L.); (C.C.); (C.W.); (S.W.)
- Cholangiocarcinoma Research Institute, Khon Kaen University, Khon Kaen 40002, Thailand;
| | - Atit Silsirivanit
- Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (S.W.); (K.S.); (U.C.); (S.L.); (C.C.); (C.W.); (S.W.)
- Cholangiocarcinoma Research Institute, Khon Kaen University, Khon Kaen 40002, Thailand;
- Correspondence: ; Tel.: +66-43-363-265
| | - Kanlayanee Sawanyawisuth
- Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (S.W.); (K.S.); (U.C.); (S.L.); (C.C.); (C.W.); (S.W.)
- Cholangiocarcinoma Research Institute, Khon Kaen University, Khon Kaen 40002, Thailand;
| | - Ubon Cha’on
- Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (S.W.); (K.S.); (U.C.); (S.L.); (C.C.); (C.W.); (S.W.)
| | - Sakda Waraasawapati
- Cholangiocarcinoma Research Institute, Khon Kaen University, Khon Kaen 40002, Thailand;
- Department of Pathology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | | | - Sukanya Luang
- Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (S.W.); (K.S.); (U.C.); (S.L.); (C.C.); (C.W.); (S.W.)
- Cholangiocarcinoma Research Institute, Khon Kaen University, Khon Kaen 40002, Thailand;
| | - Chalongchai Chalermwat
- Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (S.W.); (K.S.); (U.C.); (S.L.); (C.C.); (C.W.); (S.W.)
| | - Chaisiri Wongkham
- Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (S.W.); (K.S.); (U.C.); (S.L.); (C.C.); (C.W.); (S.W.)
- Cholangiocarcinoma Research Institute, Khon Kaen University, Khon Kaen 40002, Thailand;
| | - Sopit Wongkham
- Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (S.W.); (K.S.); (U.C.); (S.L.); (C.C.); (C.W.); (S.W.)
- Cholangiocarcinoma Research Institute, Khon Kaen University, Khon Kaen 40002, Thailand;
| |
Collapse
|
6
|
Wei M, Wang PG. Desialylation in physiological and pathological processes: New target for diagnostic and therapeutic development. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2019; 162:25-57. [PMID: 30905454 DOI: 10.1016/bs.pmbts.2018.12.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Desialylation is a pivotal part of sialic acid metabolism, which initiates the catabolism of glycans by removing the terminal sialic acid residues on glycans, thereby modulating the structure and functions of glycans, glycoproteins, or glycolipids. The functions of sialic acids have been well recognized, whereas the function of desialylation process is underappreciated or largely ignored. However, accumulating evidence demonstrates that desialylation plays an important role in a variety of physiological and pathological processes. This chapter summarizes the current knowledge pertaining to desialylation in a variety of physiological and pathological processes, with a focus on the underlying molecular mechanisms. The potential of targeting desialylation process for diagnostic and therapeutic development is also discussed.
Collapse
Affiliation(s)
- Mohui Wei
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, United States.
| | - Peng George Wang
- Department of Chemistry, Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA, United States
| |
Collapse
|
7
|
Forcella M, Mozzi A, Stefanini FM, Riva A, Epistolio S, Molinari F, Merlo E, Monti E, Fusi P, Frattini M. Deregulation of sialidases in human normal and tumor tissues. Cancer Biomark 2018; 21:591-601. [PMID: 29278877 DOI: 10.3233/cbm-170548] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND Aberrant sialylation is a characteristic feature associated with cancer. The four types of mammalian sialidases identified to date have been shown to behave in different manners during carcinogenesis. While NEU1, NEU2 and NEU4 have been observed to oppose malignant phenotypes, the membrane-bound sialidase NEU3 was revealed to promote cancer progression. OBJECTIVES With the aim of improving the knowledge about sialidases deregulation in various cancer types, we investigated the amount of NEU1, NEU3 and NEU4 transcripts in paired normal and tumor tissues from 170 patients with 11 cancer types. METHODS mRNA was extracted from patients' tissue specimens and retrotranscribed into cDNA, which was quantified by Real-Time PCR. RESULTS We found NEU1 and NEU3 to be up regulated, while NEU4 was down regulated in most cancer types. In particular, colorectal cancer tissues showed the highest increase in NEU3 expression. Both NEU1 and NEU3 showed a strong up-regulation in ovarian cancer. CONCLUSIONS Our data show that human sialidases are expressed at different levels in healthy tissues and are strongly deregulated in tumors. Moreover, sialidases expression in our European cohort showed significant differences from Asian populations. Some of these peculiar features open potential applications of sialidases in cancer diagnosis and therapy.
Collapse
Affiliation(s)
- Matilde Forcella
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Alessandra Mozzi
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Federico M Stefanini
- Department of Statistics, Computer Science, Applications, University of Florence, Florence, Italy
| | - Alice Riva
- Institute of Pathology, Locarno, Switzerland
| | | | | | | | - Eugenio Monti
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Paola Fusi
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, Milan, Italy.,Department of Biotechnologies and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Milo Frattini
- Institute of Pathology, Locarno, Switzerland.,Department of Biotechnologies and Biosciences, University of Milano-Bicocca, Milan, Italy
| |
Collapse
|
8
|
Wielgat P, Trofimiuk E, Czarnomysy R, Holownia A, Braszko JJ. Sialylation pattern in lung epithelial cell line and Siglecs expression in monocytic THP-1 cells as cellular indicators of cigarette smoke - induced pathology in vitro. Exp Lung Res 2018; 44:167-177. [PMID: 29781747 DOI: 10.1080/01902148.2018.1461959] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
PURPOSE Cellular response to cigarette smoke (CS) involves activation of recognition receptors resulting in changes in immune status, oxidative stress and cell turnover. We investigated the effects of CS on sialic acid-binding immunoglobulin type lectins (Siglecs) expression and their sialylated ligands in human immune and non-immune cells. METHODS Human monocytes (THP-1) and epithelial cells (A549) were cultured in CS-conditioned medium (CSM). Expression of Siglec-8 and Siglec-5/Siglec-14 was analysed in THP-1 cells using flow cytometry. The effects of CS on immune activity was evaluated flow cytometrically in these cells by assessment of phagocytosis and intracellular expression IL-1β and IL-10. Detection and differentiation of sialic acids was analyzed by dot blot, western blot and flow cytometry using plant lectins and antibodies. RESULTS Exposure to CS significantly increased expression of Siglec-8 and Siglec-5/Siglec-14 in THP-1 cells. These changes were accompanied by enhanced intracellular level of IL-1β and IL-10 but reduced phagocytic activity. In THP-1 and A549 cells, the level of α2,3-sialic acids, but not α2,6-sialic acid, was significantly increased when compared to naïve cells. The level of α2,8-sialic acids increased significantly in A549 cells, but not in THP-1 cells, after exposure to CS. CONCLUSION These results show that cellular response to CS involves changes in expression of Siglec receptors and sialylated ligands functionally associated with immunity.
Collapse
Affiliation(s)
- Przemyslaw Wielgat
- a Department of Clinical Pharmacology , Medical University of Bialystok , Bialystok , Poland
| | - Emil Trofimiuk
- a Department of Clinical Pharmacology , Medical University of Bialystok , Bialystok , Poland
| | - Robert Czarnomysy
- b Department of Synthesis and Technology of Drugs , Medical University of Bialystok , Bialystok , Poland
| | - Adam Holownia
- c Department of Pharmacology , Medical University of Bialystok , Bialystok , Poland
| | - Jan J Braszko
- a Department of Clinical Pharmacology , Medical University of Bialystok , Bialystok , Poland
| |
Collapse
|
9
|
Frattini M, Molinari F, Epistolio S. The role of Piccolo in cancer treatment: relationship with EGFR and related therapies, and a marker for new targeted therapies. J Thorac Dis 2017; 9:4240-4243. [PMID: 29268482 DOI: 10.21037/jtd.2017.10.38] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Milo Frattini
- Laboratory of Molecular Pathology, Institute of Pathology, Locarno, Switzerland
| | - Francesca Molinari
- Laboratory of Molecular Pathology, Institute of Pathology, Locarno, Switzerland
| | - Samantha Epistolio
- Laboratory of Molecular Pathology, Institute of Pathology, Locarno, Switzerland
| |
Collapse
|
10
|
Forcella M, Oldani M, Epistolio S, Freguia S, Monti E, Fusi P, Frattini M. Non-small cell lung cancer (NSCLC), EGFR downstream pathway activation and TKI targeted therapies sensitivity: Effect of the plasma membrane-associated NEU3. PLoS One 2017; 12:e0187289. [PMID: 29088281 PMCID: PMC5663482 DOI: 10.1371/journal.pone.0187289] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 10/17/2017] [Indexed: 11/30/2022] Open
Abstract
Adenocarcinoma of Non-Small Cell Lung Cancer (NSCLC) is a severe disease. Patients carrying EGFR mutations may benefit from EGFR targeted therapies (e.g.: gefitinib). Recently, it has been shown that sialidase NEU3 directly interacts and regulates EGFR. In this work, we investigate the effect of sialidase NEU3 overexpression on EGFR pathways activation and EGFR targeted therapies sensitivity, in a series of lung cancer cell lines. NEU3 overexpression, forced after transfection, does not affect NSCLC cell viability. We demonstrate that NEU3 overexpression stimulates the ERK pathway but this activation is completely abolished by gefitinib treatment. The Akt pathway is also hyper-activated upon NEU3 overexpression, but gefitinib is able only to decrease, and not to abolish, such activation. These findings indicate that NEU3 can act directly on the ERK pathway through EGFR and both directly and indirectly with respect to EGFR on the Akt pathway. Furthermore, we provide evidence that a healthy mucosa cell line (with EGFR wild-type gene sequence) is slightly sensitive to gefitinib, especially in the presence of NEU3 overexpression, thus hypothesizing that NEU3 overexpressing patients may benefit from EGFR targeted therapies also in absence of EGFR point mutations. Overall, the expression of NEU3 may be a novel diagnostic marker in NSCLC because, by its ability to stimulate EGFR downstream pathways with direct and indirect mechanisms, it may help in the identification of patients who can profit from EGFR targeted therapies in absence of EGFR activating mutations or from new combinations of EGFR and Akt inhibitors.
Collapse
Affiliation(s)
- Matilde Forcella
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, Milano, Italy
| | - Monica Oldani
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, Milano, Italy
| | - Samantha Epistolio
- Laboratory of Molecular Pathology, Institute of Pathology, Locarno, Switzerland
| | - Stefania Freguia
- Laboratory of Molecular Pathology, Institute of Pathology, Locarno, Switzerland
| | - Eugenio Monti
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
- * E-mail: (EM); (MF)
| | - Paola Fusi
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, Milano, Italy
| | - Milo Frattini
- Laboratory of Molecular Pathology, Institute of Pathology, Locarno, Switzerland
- * E-mail: (EM); (MF)
| |
Collapse
|
11
|
Bhide GP, Colley KJ. Sialylation of N-glycans: mechanism, cellular compartmentalization and function. Histochem Cell Biol 2017; 147:149-174. [PMID: 27975143 PMCID: PMC7088086 DOI: 10.1007/s00418-016-1520-x] [Citation(s) in RCA: 164] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/23/2016] [Indexed: 12/18/2022]
Abstract
Sialylated N-glycans play essential roles in the immune system, pathogen recognition and cancer. This review approaches the sialylation of N-glycans from three perspectives. The first section focuses on the sialyltransferases that add sialic acid to N-glycans. Included in the discussion is a description of these enzymes' glycan acceptors, conserved domain organization and sequences, molecular structure and catalytic mechanism. In addition, we discuss the protein interactions underlying the polysialylation of a select group of adhesion and signaling molecules. In the second section, the biosynthesis of sialic acid, CMP-sialic acid and sialylated N-glycans is discussed, with a special emphasis on the compartmentalization of these processes in the mammalian cell. The sequences and mechanisms maintaining the sialyltransferases and other glycosylation enzymes in the Golgi are also reviewed. In the final section, we have chosen to discuss processes in which sialylated glycans, both N- and O-linked, play a role. The first part of this section focuses on sialic acid-binding proteins including viral hemagglutinins, Siglecs and selectins. In the second half of this section, we comment on the role of sialylated N-glycans in cancer, including the roles of β1-integrin and Fas receptor N-glycan sialylation in cancer cell survival and drug resistance, and the role of these sialylated proteins and polysialic acid in cancer metastasis.
Collapse
Affiliation(s)
- Gaurang P Bhide
- Department of Biochemistry and Molecular Genetics, College of Medicine, The University of Illinois at Chicago, 900 S. Ashland Avenue, MC669, Chicago, IL, 60607, USA
| | - Karen J Colley
- Department of Biochemistry and Molecular Genetics, College of Medicine, The University of Illinois at Chicago, 900 S. Ashland Avenue, MC669, Chicago, IL, 60607, USA.
| |
Collapse
|
12
|
Minami A. [Multidimensional Analysis of Hippocampal Excitatory Neurotransmission and Development of Analytical Tools for Glycans]. YAKUGAKU ZASSHI 2016; 135:1341-8. [PMID: 26632149 DOI: 10.1248/yakushi.15-00220] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Sialidase removes sialic acid residues from sialoglycoconjugates such as glycoproteins and glycolipids. Since sialic acid plays crucial roles in synaptic plasticity and memory in the hippocampus, the regulation of sialyl signaling by sialidase is also necessary for neural functions. However, since mammalian sialidase activity is remarkably weak, it has been difficult to detect sialidase activity in mammalian tissues. Determination of the distribution of sialidase activity in living mammalian tissues would provide much valuable information for understanding the roles of sialidase in physiological functions. Therefore, we synthesized a novel benzothiazolylphenol-based sialic acid derivative (BTP-Neu5Ac) as a fluorescent sialidase substrate. After cleavage of BTP-Neu5Ac, which is water soluble and shows little fluorescence, with sialidase, the water-insoluble fluorophore benzothiazolylphenol (BTP) released from BTP-Neu5Ac stains tissue and shows bright fluorescence. BTP-Neu5Ac can visualize sialidase activity in brain tissue with high levels of sensitivity and specificity. The sialidase expression level is markedly high in various human cancers such as colon, renal, prostate, and ovarian cancers. BTP-Neu5Ac can detect human colon cancers sensitively. Thus, BTP-Neu5Ac is useful not only for physiological research but also as a cancer probe. BTP-Neu5Ac is now being used in virology research. In this review, methods for histochemical imaging of sialidase activity and the role of sialidase in hippocampal memory are described based on the author's study of multidimensional analysis of hippocampal excitatory neurotransmission and development of analytical tools for glycans, which was awarded a prize by the Tokai branch of the Pharmaceutical Society of Japan.
Collapse
Affiliation(s)
- Akira Minami
- Department of Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka
| |
Collapse
|
13
|
Abstract
Sample preparation has lagged far behind the evolution of instrumentation used in mass-linked protein analysis. Trypsin digestion, for example, still takes a day, as it did 50 years ago, while mass spectral analyses are achieved in seconds. Higher order structure of proteins is frequently modified by varying digestion conditions: shifting the initial points of trypsin cleavage, changing digestion pathways, accelerating peptide bond demasking and altering the distribution of miscleaved products at the completion of proteolysis. Reduction and alkylation are even circumvented in many cases. This review focuses on immobilized enzyme reactor technology as a means to achieve accelerated trypsin digestion by exploiting these phenomena.
Collapse
|
14
|
Minami A, Otsubo T, Ieno D, Ikeda K, Kanazawa H, Shimizu K, Ohata K, Yokochi T, Horii Y, Fukumoto H, Taguchi R, Takahashi T, Oku N, Suzuki T. Visualization of sialidase activity in Mammalian tissues and cancer detection with a novel fluorescent sialidase substrate. PLoS One 2014; 9:e81941. [PMID: 24427265 PMCID: PMC3888388 DOI: 10.1371/journal.pone.0081941] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Accepted: 10/17/2013] [Indexed: 02/05/2023] Open
Abstract
Sialidase removes sialic acid from sialoglycoconjugates and plays crucial roles in many physiological and pathological processes. Various human cancers express an abnormally high level of the plasma membrane-associated sialidase isoform.Visualization of sialidase activity in living mammalian tissues would be useful not only for understanding sialidase functions but also for cancer diagnosis. However, since enzyme activity of mammalian sialidase is remarkably weak compared with that of bacterial and viral sialidases, it has been difficult to detect sialidase activity in mammalian tissues. We synthesized a novel benzothiazolylphenol-based sialic acid derivative (BTP-Neu5Ac) as a fluorescent sialidase substrate. BTP-Neu5Ac can visualize sialidase activities sensitively and selectively in acute rat brain slices. Cancer cells implanted orthotopically in mouse colons and human colon cancers (stages T3-T4) were also clearly detected with BTP-Neu5Ac. The results suggest that BTP-Neu5Ac is useful for histochemical imaging of sialidase activities.
Collapse
Affiliation(s)
- Akira Minami
- Department of Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
| | - Tadamune Otsubo
- Department of Organic Chemistry, School of Pharmaceutical Sciences, Hiroshima International University, Hiroshima, Japan
| | - Daisuke Ieno
- Department of Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
| | - Kiyoshi Ikeda
- Department of Organic Chemistry, School of Pharmaceutical Sciences, Hiroshima International University, Hiroshima, Japan
| | - Hiroaki Kanazawa
- Department of Functional Anatomy, School of Nursing, University of Shizuoka, Shizuoka, Japan
| | - Kosuke Shimizu
- Department of Medical Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
| | - Ko Ohata
- Department of Gastroenterological Surgery, Shizuoka General Hospital, Shizuoka, Japan
| | - Tsunehiro Yokochi
- Department of Medical Technology, Shizuoka General Hospital, Shizuoka, Japan
| | - Yuuki Horii
- Department of Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
| | - Hokuto Fukumoto
- Department of Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
| | - Risa Taguchi
- Department of Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
| | - Tadanobu Takahashi
- Department of Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
| | - Naoto Oku
- Department of Medical Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
| | - Takashi Suzuki
- Department of Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
- * E-mail:
| |
Collapse
|
15
|
Pio R, Corrales L, Lambris JD. The role of complement in tumor growth. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 772:229-62. [PMID: 24272362 DOI: 10.1007/978-1-4614-5915-6_11] [Citation(s) in RCA: 137] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Complement is a central part of the immune system that has developed as a first defense against non-self cells. Neoplastic transformation is accompanied by an increased capacity of the malignant cells to activate complement. In fact, clinical data demonstrate complement activation in cancer patients. On the basis of the use of protective mechanisms by malignant cells, complement activation has traditionally been considered part of the body's immunosurveillance against cancer. Inhibitory mechanisms of complement activation allow cancer cells to escape from complement-mediated elimination and hamper the clinical efficacy of monoclonal antibody-based cancer immunotherapies. To overcome this limitation, many strategies have been developed with the goal of improving complement-mediated effector mechanisms. However, significant work in recent years has identified new and surprising roles for complement activation within the tumor microenvironment. Recent reports suggest that complement elements can promote tumor growth in the context of chronic inflammation. This chapter reviews the data describing the role of complement activation in cancer immunity, which offers insights that may aid the development of more effective therapeutic approaches to control cancer.
Collapse
Affiliation(s)
- Ruben Pio
- Oncology Division (CIMA), and Department of Biochemistry and Genetics (School of Science), University of Navarra, Pamplona, Spain,
| | | | | |
Collapse
|
16
|
Pio R, Ajona D, Lambris JD. Complement inhibition in cancer therapy. Semin Immunol 2013; 25:54-64. [PMID: 23706991 DOI: 10.1016/j.smim.2013.04.001] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 04/13/2013] [Indexed: 02/08/2023]
Abstract
For decades, complement has been recognized as an effector arm of the immune system that contributes to the destruction of tumor cells. In fact, many therapeutic strategies have been proposed that are based on the intensification of complement-mediated responses against tumors. However, recent studies have challenged this paradigm by demonstrating a tumor-promoting role for complement. Cancer cells seem to be able to establish a convenient balance between complement activation and inhibition, taking advantage of complement initiation without suffering its deleterious effects. Complement activation may support chronic inflammation, promote an immunosuppressive microenvironment, induce angiogenesis, and activate cancer-related signaling pathways. In this context, inhibition of complement activation would be a therapeutic option for treating cancer. This concept is relatively new and deserves closer attention. In this article, we summarize the mechanisms of complement activation on cancer cells, the cancer-promoting effect of complement initiation, and the rationale behind the use of complement inhibition as a therapeutic strategy against cancer.
Collapse
Affiliation(s)
- Ruben Pio
- Oncology Division, Center for Applied Medical Research-CIMA, Pamplona, Spain. rpio.@unav.es
| | | | | |
Collapse
|