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The less conserved metal-binding site in human CRISP1 remains sensitive to zinc ions to permit protein oligomerization. Sci Rep 2021; 11:5498. [PMID: 33750840 PMCID: PMC7943821 DOI: 10.1038/s41598-021-84926-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 02/18/2021] [Indexed: 12/30/2022] Open
Abstract
Cysteine-rich secretory proteins (CRISPs) are a subgroup of the CRISP, antigen 5 and PR-1 (CAP) superfamily that is characterized by the presence of a conserved CAP domain. Two conserved histidines in the CAP domain are proposed to function as a Zn2+-binding site with unknown function. Human CRISP1 is, however, one of the few family members that lack one of these characteristic histidine residues. The Zn2+-dependent oligomerization properties of human CRISP1 were investigated using a maltose-binding protein (MBP)-tagging approach in combination with low expression levels in XL-1 Blue bacteria. Moderate yields of soluble recombinant MBP-tagged human CRISP1 (MBP-CRISP1) and the MBP-tagged CAP domain of CRISP1 (MBP-CRISP1ΔC) were obtained. Zn2+ specifically induced oligomerization of both MBP-CRISP1 and MBP-CRISP1ΔC in vitro. The conserved His142 in the CAP domain was essential for this Zn2+ dependent oligomerization process, confirming a role of the CAP metal-binding site in the interaction with Zn2+. Furthermore, MBP-CRISP1 and MBP-CRISP1ΔC oligomers dissociated into monomers upon Zn2+ removal by EDTA. Condensation of proteins is characteristic for maturing sperm in the epididymis and this process was previously found to be Zn2+-dependent. The Zn2+-induced oligomerization of human recombinant CRISP1 may shed novel insights into the formation of functional protein complexes involved in mammalian fertilization.
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Prajapati PB, Chotalia J, Bodiwala KB, Marolia BP, Shah SA. Development and Validation of Stability-Indicating HPTLC Method for Estimation of Naratriptan Hydrochloride in Its Pharmaceutical Dosage Form and Its Content Uniformity Testing. J Chromatogr Sci 2016; 54:1129-36. [PMID: 27406125 DOI: 10.1093/chromsci/bmw080] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Indexed: 11/13/2022]
Abstract
The present research project involves development and validation of a stability-indicating HPTLC method for the estimation of naratriptan-HCl in their pharmaceutical dosage forms and its content uniformity testing. Naratriptan-HCl was subjected to alkaline, acidic, oxidative, neutral, thermal (dry heat) and photo-degradation conditions. The chromatographic separation was carried out using a precoated silica gel G 60 F254 TLC plate as the stationary phase and dichloromethane-toluene-methanol-triethylamine (4 : 4 : 2 : 1, v/v/v/v) as the mobile phase. The spots of NRT-HCl and its degradation products were detected at 290 nm. The Rf value of NRT-HCl was found to be 0.60 ± 0.02. The linearity was obtained in the range of 100-500 ng/spot. The limit of detection and limit of quantitation were found to be 6.07 ng/spot and 18.41 ng/spot, respectively. The percentage recovery was found in the range of 98.87-99.55%. NRT-HCl was degraded under acidic, alkaline and oxidative conditions while stable under photolytic, neutral and dry heat conditions. The developed method was applied for estimation of naratriptan-HCl in marketed formulations and its content uniformity testing.
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Affiliation(s)
- Pintu B Prajapati
- Maliba Pharmacy College, Bardoli - Mahuva Road, Tarsadi 394350, Gujarat, India
| | - Jagdish Chotalia
- Maliba Pharmacy College, Bardoli - Mahuva Road, Tarsadi 394350, Gujarat, India
| | - Kunjan B Bodiwala
- Maliba Pharmacy College, Bardoli - Mahuva Road, Tarsadi 394350, Gujarat, India
| | - Bhavin P Marolia
- Maliba Pharmacy College, Bardoli - Mahuva Road, Tarsadi 394350, Gujarat, India
| | - Shailesh A Shah
- Maliba Pharmacy College, Bardoli - Mahuva Road, Tarsadi 394350, Gujarat, India
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Vandelli D, Palazzoli F, Verri P, Rustichelli C, Marchesi F, Ferrari A, Baraldi C, Giuliani E, Licata M, Silingardi E. Development and validation of a liquid chromatography-tandem mass spectrometric assay for quantitative analyses of triptans in hair. J Chromatogr B Analyt Technol Biomed Life Sci 2016; 1017-1018:136-144. [PMID: 26970848 DOI: 10.1016/j.jchromb.2016.02.031] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 02/19/2016] [Accepted: 02/23/2016] [Indexed: 12/15/2022]
Abstract
Triptans are specific drugs widely used for acute treatment of migraine, being selective 5HT1B/1D receptor agonists. A proper assumption of triptans is very important for an effective treatment; nevertheless patients often underuse, misuse, overuse or use triptans inconsistently, i.e., not following the prescribed therapy. Drug analysis in hair can represent a powerful tool for monitoring the compliance of the patient to the therapy, since it can greatly increase the time-window of detection compared to analyses in biological fluids, such as plasma or urine. In the present study, a liquid chromatography-tandem mass spectrometric (LC-MS/MS) method has been developed and validated for the quantitative analysis in human hair of five triptans commonly prescribed in Italy: almotriptan (AL), eletriptan (EP), rizatriptan (RIZ), sumatriptan (SUM) and zolmitriptan (ZP). Hair samples were decontaminated and incubated overnight in diluted hydrochloric acid; the extracts were purified by mixed-mode SPE cartridges and analyzed by LC-MS/MS under gradient elution in positive multiple reaction monitoring (MRM) mode. The procedure was fully validated in terms of selectivity, linearity, limit of detection (LOD) and lower limit of quantitation (LLOQ), accuracy, precision, carry-over, recovery, matrix effect and dilution integrity. The method was linear in the range 10-1000pg/mg hair, with R(2) values of at least 0.990; the validated LLOQ values were in the range 5-7pg/mg hair. The method offered satisfactory precision (RSD <10%), accuracy (90-110%) and recovery (>85%) values. The validated procedure was applied on 147 authentic hair samples from subjects being treated in the Headache Centre of Modena University Hospital in order to verify the possibility of monitoring the corresponding hair levels for the taken triptans.
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Affiliation(s)
- Daniele Vandelli
- Department of Diagnostic Medicine, Clinical and Public Health, Unit of Legal Medicine-Forensic Toxicology Laboratory, University of Modena and Reggio Emilia, via del Pozzo, 71, 41124 Modena, Italy.
| | - Federica Palazzoli
- Department of Diagnostic Medicine, Clinical and Public Health, Unit of Legal Medicine-Forensic Toxicology Laboratory, University of Modena and Reggio Emilia, via del Pozzo, 71, 41124 Modena, Italy
| | - Patrizia Verri
- Department of Diagnostic Medicine, Clinical and Public Health, Unit of Legal Medicine-Forensic Toxicology Laboratory, University of Modena and Reggio Emilia, via del Pozzo, 71, 41124 Modena, Italy
| | - Cecilia Rustichelli
- Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi, 103, 41125 Modena, Italy
| | - Filippo Marchesi
- Department of Diagnostic Medicine, Clinical and Public Health, Unit of Legal Medicine-Forensic Toxicology Laboratory, University of Modena and Reggio Emilia, via del Pozzo, 71, 41124 Modena, Italy
| | - Anna Ferrari
- Department of Diagnostic, Clinical and Public Health Medicine, Unit of Medical Toxicology, Headache and Drug Abuse Centre, University of Modena and Reggio Emilia, via del Pozzo, 71, 41124 Modena, Italy
| | - Carlo Baraldi
- Department of Diagnostic, Clinical and Public Health Medicine, Unit of Medical Toxicology, Headache and Drug Abuse Centre, University of Modena and Reggio Emilia, via del Pozzo, 71, 41124 Modena, Italy
| | - Enrico Giuliani
- Clinical and Experimental Medicine Doctorate School, University of Modena and Reggio Emilia, via del Pozzo, 71, 41124 Modena, Italy
| | - Manuela Licata
- Department of Diagnostic Medicine, Clinical and Public Health, Unit of Legal Medicine-Forensic Toxicology Laboratory, University of Modena and Reggio Emilia, via del Pozzo, 71, 41124 Modena, Italy
| | - Enrico Silingardi
- Department of Diagnostic Medicine, Clinical and Public Health, Unit of Legal Medicine-Forensic Toxicology Laboratory, University of Modena and Reggio Emilia, via del Pozzo, 71, 41124 Modena, Italy
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Cielecka-Piontek J, Zalewski P, Jelińska A, Garbacki P. UHPLC: The Greening Face of Liquid Chromatography. Chromatographia 2013; 76:1429-1437. [PMID: 24273332 PMCID: PMC3825615 DOI: 10.1007/s10337-013-2434-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2012] [Revised: 12/22/2012] [Accepted: 02/14/2013] [Indexed: 01/05/2023]
Abstract
Pharmaceutical analysis based on chromatographic separation is an important part of studies aimed at developing routine quality analysis of drugs. High-performance liquid chromatography (HPLC) is one of the main analytical techniques recommended for drug analysis. Although it meets many criteria vital for analysis, it is time-consuming and uses a relatively high amount of organic solvents compared to other analytical techniques. Recently, Ultra-high-performance liquid chromatography (UHPLC) has been frequently proposed as an alternative to HPLC, which means introducing an environment-friendly approach to drug analysis achieved by reducing the consumption of solvents. It also offers greater chromatographic resolution and higher sensitivity as well as requiring less time due to faster analysis. This review focuses on the basics of UHPLC, compares that technique with HPLC and discusses the possibilities of applying UHPLC for the analysis of different pharmaceuticals and biopharmaceuticals.
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Affiliation(s)
- Judyta Cielecka-Piontek
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Poznan University of Medical Sciences, Grunwaldzka 6, 60-780 Poznan, Poland
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