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Makwana MV, Dos Santos Souza C, Pickup BT, Thompson MJ, Lomada SK, Feng Y, Wieland T, Jackson RFW, Muimo R. Chemical Tools for Studying Phosphohistidine: Generation of Selective τ-Phosphohistidine and π-Phosphohistidine Antibodies. Chembiochem 2023; 24:e202300182. [PMID: 37183567 DOI: 10.1002/cbic.202300182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 05/11/2023] [Accepted: 05/11/2023] [Indexed: 05/16/2023]
Abstract
Nonhydrolysable stable analogues of τ-phosphohistidine (τ-pHis) and π-pHis have been designed, aided by electrostatic surface potential calculations, and subsequently synthesized. The τ-pHis and π-pHis analogues (phosphopyrazole 8 and pyridyl amino amide 13, respectively) were used as haptens to generate pHis polyclonal antibodies. Both τ-pHis and π-pHis conjugates in the form of BSA-glutaraldehyde-τ-pHis and BSA-glutaraldehyde-π-pHis were synthesized and characterized by 31 P NMR spectroscopy. Commercially available τ-pHis (SC56-2) and π-pHis (SC1-1; SC50-3) monoclonal antibodies were used to show that the BSA-G-τ-pHis and BSA-G-π-pHis conjugates could be used to assess the selectivity of pHis antibodies in a competitive ELISA. Subsequently, the selectivity of the pHis antibodies generated by using phosphopyrazole 8 and pyridyl amino amide 13 as haptens was assessed by competitive ELISA against His, pSer, pThr, pTyr, τ-pHis and π-pHis. Antibodies generated by using phosphopyrazole 8 as a hapten were found to be selective for τ-pHis, and antibodies generated by using pyridyl amino amide 13 were found to be selective for π-pHis. Both τ- and π-pHis antibodies were shown to be effective in immunological experiments, including ELISA, western blot, and immunofluorescence. The τ-pHis antibody was also shown to be useful in the immunoprecipitation of proteins containing pHis.
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Affiliation(s)
- Mehul V Makwana
- Department of Chemistry, The University of Sheffield, Brook Hill, Sheffield, S3 7HF, UK
- Department of Infection Immunity and Cardiovascular Disease, Medical School, The University of Sheffield, Beech Hill Road, Sheffield, S10 2RX, UK
| | - Cleide Dos Santos Souza
- Sheffield Instituate of Translational Neuroscience, The University of Sheffield, 385a Glossop Road, Sheffield, S10 2HQ, UK
| | - Barry T Pickup
- Department of Chemistry, The University of Sheffield, Brook Hill, Sheffield, S3 7HF, UK
| | - Mark J Thompson
- Department of Oncology and Metabolism, Medical School, The University Of Sheffield, Beech Hill Road, Sheffield, S10 2RX, UK
| | - Santosh K Lomada
- Experimental Pharmacology, European Center of Angioscience, Medical Faculty Mannheim, Heidelberg University, 68167, Mannheim, Germany
| | - Yuxi Feng
- Experimental Pharmacology, European Center of Angioscience, Medical Faculty Mannheim, Heidelberg University, 68167, Mannheim, Germany
| | - Thomas Wieland
- Experimental Pharmacology, European Center of Angioscience, Medical Faculty Mannheim, Heidelberg University, 68167, Mannheim, Germany
| | - Richard F W Jackson
- Department of Chemistry, The University of Sheffield, Brook Hill, Sheffield, S3 7HF, UK
| | - Richmond Muimo
- Department of Infection Immunity and Cardiovascular Disease, Medical School, The University of Sheffield, Beech Hill Road, Sheffield, S10 2RX, UK
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The Complex Functions of the NME Family-A Matter of Location and Molecular Activity. Int J Mol Sci 2021; 22:ijms222313083. [PMID: 34884887 PMCID: PMC8658066 DOI: 10.3390/ijms222313083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Accepted: 11/24/2021] [Indexed: 11/17/2022] Open
Abstract
The family of NME proteins represents a quite complex group of multifunctional enzymes [...].
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Eshwaran R, Kolibabka M, Poschet G, Jainta G, Zhao D, Teuma L, Murillo K, Hammes HP, Schmidt M, Wieland T, Feng Y. Glucosamine protects against neuronal but not vascular damage in experimental diabetic retinopathy. Mol Metab 2021; 54:101333. [PMID: 34506973 PMCID: PMC8479835 DOI: 10.1016/j.molmet.2021.101333] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2021] [Revised: 08/11/2021] [Accepted: 08/30/2021] [Indexed: 01/02/2023] Open
Abstract
Objective Glucosamine, an intermetabolite of the hexosamine biosynthesis pathway (HBP), is a widely used nutritional supplement in osteoarthritis patients, a subset of whom also suffer from diabetes. HBP is activated in diabetic retinopathy (DR). The aim of this study is to investigate the yet unclear effects of glucosamine on DR. Methods In this study, we tested the effect of glucosamine on vascular and neuronal pathology in a mouse model of streptozotocin-induced DR in vivo and on cultured endothelial and Müller cells to elucidate the underlying mechanisms of action in vitro. Results Glucosamine did not alter the blood glucose or HbA1c levels in the animals, but induced body weight gain in the non-diabetic animals. Interestingly, the impaired neuronal function in diabetic animals could be prevented by glucosamine treatment. Correspondingly, the activation of Müller cells was prevented in the retina as well as in cell culture. Conversely, glucosamine administration in the normal retina damaged the retinal vasculature by increasing pericyte loss and acellular capillary formation, likely by interfering with endothelial survival signals as seen in vitro in cultured endothelial cells. Nevertheless, under diabetic conditions, no further increase in the detrimental effects were observed. Conclusions In conclusion, the effects of glucosamine supplementation in the retina appear to be a double-edged sword: neuronal protection in the diabetic retina and vascular damage in the normal retina. Thus, glucosamine supplementation in osteoarthritis patients with or without diabetes should be taken with care. The hexosamine biosynthesis pathway (HBP) is activated in diabetic retinopathy (DR), which manifests as vascular and neuronal damage in the retina. Glucosamine, metabolized in the HBP, is a widely used oral supplement for osteoarthritis treatment. Glucosamine supplementation improved neuronal function in retinas of mice with experimental DR, but induced vascular damage in normal retinas. Müller cell activation and endothelial survival signals in the retina were affected by glucosamine. Patients with or without diabetes should take caution with glucosamine supplementation.
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Affiliation(s)
- Rachana Eshwaran
- Experimental Pharmacology Mannheim, European Center for Angioscience, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.
| | - Matthias Kolibabka
- 5th Medical Clinic, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.
| | - Gernot Poschet
- Center for Organismal Studies (COS), Heidelberg, Germany.
| | - Gregor Jainta
- Experimental Pharmacology Mannheim, European Center for Angioscience, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.
| | - Di Zhao
- Experimental Pharmacology Mannheim, European Center for Angioscience, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.
| | - Loic Teuma
- Experimental Pharmacology Mannheim, European Center for Angioscience, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.
| | - Katharina Murillo
- 5th Medical Clinic, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.
| | - Hans-Peter Hammes
- 5th Medical Clinic, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.
| | - Martina Schmidt
- University of Groningen, Department of Molecular Pharmacology, 9713AV, Groningen, the Netherlands; University of Groningen, University Medical Center Groningen, Groningen Research Institute for Asthma and COPD (GRIAC), Groningen, the Netherlands.
| | - Thomas Wieland
- Experimental Pharmacology Mannheim, European Center for Angioscience, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany; DZHK (German Center for Cardiovascular Research), Partner site Heidelberg/Mannheim, Germany.
| | - Yuxi Feng
- Experimental Pharmacology Mannheim, European Center for Angioscience, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.
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Involvement of NDPK-B in Glucose Metabolism-Mediated Endothelial Damage via Activation of the Hexosamine Biosynthesis Pathway and Suppression of O-GlcNAcase Activity. Cells 2020; 9:cells9102324. [PMID: 33086728 PMCID: PMC7588982 DOI: 10.3390/cells9102324] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 10/12/2020] [Accepted: 10/13/2020] [Indexed: 12/21/2022] Open
Abstract
Our previous studies identified that retinal endothelial damage caused by hyperglycemia or nucleoside diphosphate kinase-B (NDPK-B) deficiency is linked to elevation of angiopoietin-2 (Ang-2) and the activation of the hexosamine biosynthesis pathway (HBP). Herein, we investigated how NDPK-B is involved in the HBP in endothelial cells (ECs). The activities of NDPK-B and O-GlcNAcase (OGA) were measured by in vitro assays. Nucleotide metabolism and O-GlcNAcylated proteins were assessed by UPLC-PDA (Ultra-performance liquid chromatography with Photodiode array detection) and immunoblot, respectively. Re-expression of NDPK-B was achieved with recombinant adenoviruses. Our results show that NDPK-B depletion in ECs elevated UDP-GlcNAc levels and reduced NDPK activity, similar to high glucose (HG) treatment. Moreover, the expression and phosphorylation of glutamine:fructose-6-phosphate amidotransferase (GFAT) were induced, whereas OGA activity was suppressed. Furthermore, overall protein O-GlcNAcylation, along with O-GlcNAcylated Ang-2, was increased in NDPK-B depleted ECs. Pharmacological elevation of protein O-GlcNAcylation using Thiamet G (TMG) or OGA siRNA increased Ang-2 levels. However, the nucleoside triphosphate to diphosphate (NTP/NDP) transphosphorylase and histidine kinase activity of NDPK-B were dispensable for protein O-GlcNAcylation. NDPK-B deficiency hence results in the activation of HBP and the suppression of OGA activity, leading to increased protein O-GlcNAcylation and further upregulation of Ang-2. The data indicate a critical role of NDPK-B in endothelial damage via the modulation of the HBP.
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