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André C, Lethier L, Adotevi O, Guillaume YC. Development of a new heparan sulfate proteoglycan (HSPG) chromolith LC column to study the pH dependence binding of peptide vaccines to HSPG and role of human serum albumin on its binding. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2023; 15:1323-1335. [PMID: 36810922 DOI: 10.1039/d3ay00046j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Heparan sulfate proteoglycan (HSPG) expressed on immune cell surface participate in antitumor T-cell responses generated in the acidic lymph node (LN) microenvironment. In this work, HSPG was immobilized for the first time on a HPLC chromolith support for studying the effect of extra cellular acidosis in LNs on the binding to HSPG of two peptide vaccines (universal cancer peptide UCP2 and UCP4). This home-made HSPG column enabling to work at high flow-rates, was resistance to change in pH, had a long - life time, an excellent repeatability and negligible non-specific binding sites. The performance of this affinity HSPG column was confirmed by the evaluation of recognition assay for a series of known ligand of HSPG. It was shown that at 37 °C, the UCP2 binding to HSPG versus pH described a sigmoidal shape while UCP4 remained relatively constant in the pH range 5.0-7.5 and lower than the one of UCP2. By the use of an HSA HPLC column, it was shown at 37 °C and in acidic conditions a loss of affinity of UCP2 and UCP4 to HSA. It was demonstrated that upon UCP2/HSA binding, the protonation of the histidine residue in the cluster R(arg) Q(Gln) Hist (H) of the UCP2 peptide allowed to expose more favorably than UCP4 its polar and cationic groups to the negative net charge of HSPG on immune cells. Acidic pHs led to the protonation of the UCP2 residue histidine by flipping the His switch to the on position with a concomitant increase in affinity for the negative net charge of HSPG confirming that UCP2 was more immunogenic than UCP4. As well this HSPG chromolith LC column developed in this work could be used in the feature for other protein - HSPG binding studies or for a separative mode.
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Affiliation(s)
- Claire André
- Pôle Chimie Analytique Bioanalytique et Physique (PCABP), EA 481 Neurosciences Intégrative et Cliniques, Univ. Bourgogne Franche-Comté, Besançon, F-2500, France.
| | - Lydie Lethier
- Pôle Chimie Analytique Bioanalytique et Physique (PCABP), EA 481 Neurosciences Intégrative et Cliniques, Univ. Bourgogne Franche-Comté, Besançon, F-2500, France.
| | - Olivier Adotevi
- Univ. Bourgogne Franche Comté, INSERM, EFS BFC, UMR 1098, RIGHT Interactions Greffon-Hôte Tumeur/Ingénierie Cellulaire et Génique, Besançon, F-2500, France
| | - Yves Claude Guillaume
- Pôle Chimie Analytique Bioanalytique et Physique (PCABP), EA 481 Neurosciences Intégrative et Cliniques, Univ. Bourgogne Franche-Comté, Besançon, F-2500, France.
- Pôle Pharmaceutique, University Hospital of Besançon, Besançon, F-2500, France
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Kumar A, Chalannavar RK. Characterization of the major degradation products of the praziquantel API by mass spectrometry: Development and validation of a stability-indicating reversed phase UPLC method. J LIQ CHROMATOGR R T 2023. [DOI: 10.1080/10826076.2022.2163253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Ajay Kumar
- Department of Industrial Chemistry, Mangalore University, Mangalore, India
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Salakolusu S, Sharma GVR, Katari NK, Puppala U, Kaliyapermal M, Vijay R, Doddipalla R, Geereddi MKR. Identification, isolation, and structural characterization of novel forced degradation products of apixaban using advanced analytical techniques. J Sep Sci 2022; 45:3942-3954. [PMID: 36048725 DOI: 10.1002/jssc.202200466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 08/17/2022] [Accepted: 08/26/2022] [Indexed: 11/10/2022]
Abstract
The current research explains the stress degradation behavior of Apixaban, which is an anticoagulant or blood thinner. The degradation was conducted using hydrolytic, oxidative, thermal, and photolytic conditions. Apixaban is relatively stable in oxidative, thermal, and photolytic conditions; however, considerable degradation was observed in acid and base hydrolysis. Degradation products were identified using ultra-high performance liquid chromatography-mass spectrometry, isolated using semi-preparative high-performance liquid chromatography, and structural characterization by high-resolution mass spectrometry and nuclear magnetic resonance spectroscopy. A total of five degradation products were identified and isolated in acid and base degradation. Degradation products 1, 2 & 3 were observed in acid conditions, whereas in base conditions, along with those three, two more degradation products 4, and 5 were identified. The representative thing was that among the 5 degradation products, two sets of positional isomers 1, 4, & 2, 5 were observed; out of which 2 & 5 are novel. The remaining degradation products 1, 3, and 4 are already reported tentatively using a single analytical technique of mass analysis without any evidence from nuclear magnetic resonance spectroscopy. Hence, the present study focused on using high-resolution mass, and nuclear magnetic resonance spectroscopy data for concrete confirmation of structures for degradation products. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Suresh Salakolusu
- Analytical Discovery Chemistry, Aragen Life Sciences Pvt. Ltd., IDA Nacharam, Hyderabad, 500076, India.,Department of Chemistry, Institute of Science, GITAM Deemed to be University, Visakhapatnam, Andhra Pradesh, 530045, India
| | | | - Naresh Kumar Katari
- Department of Chemistry, School of Science, GITAM Deemed to be University, Hyderabad, Telangana, 502329, India
| | - Umamaheshwar Puppala
- Analytical Discovery Chemistry, Aragen Life Sciences Pvt. Ltd., IDA Nacharam, Hyderabad, 500076, India
| | - Muralidharan Kaliyapermal
- Analytical Discovery Chemistry, Aragen Life Sciences Pvt. Ltd., IDA Nacharam, Hyderabad, 500076, India
| | - Rajani Vijay
- Analytical Discovery Chemistry, Aragen Life Sciences Pvt. Ltd., IDA Nacharam, Hyderabad, 500076, India
| | - Raju Doddipalla
- Analytical Discovery Chemistry, Aragen Life Sciences Pvt. Ltd., IDA Nacharam, Hyderabad, 500076, India
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