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Clozapine serum levels

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https://www.readbyqxmd.com/read/29715679/development-of-a-hematocrit-insensitive-device-to-collect-accurate-volumes-of-dried-blood-spots-without-specialized-skills-for-measuring-clozapine-and-its-metabolites-as-model-analytes
#1
Tatsuo Nakahara, Natsumi Otani, Takefumi Ueno, Kijiro Hashimoto
Dried blood spots have been used as alternatives to traditional plasma and serum samples. We have now developed new devices, named volumetric absorptive paper disc (VAPD) and mini-disc (VAPDmini), to collect accurate volumes of dried blood spots in a simple manner and without the need for additional instruments. VAPD consists of a filter paper disc and a filter paper sheet with holes slightly larger than the disc. The disc is fixed in one such hole without direct contact with the filter sheet. VAPDmini is a scaled-down version of the same device...
April 16, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29710513/alterations-in-oxidative-stress-markers-and-its-correlation-with-clinical-findings-in-schizophrenic-patients-consuming-perphenazine-clozapine-and-risperidone
#2
Narjes Hendouei, Samaneh Farnia, Farhad Mohseni, Azadeh Salehi, Maedeh Bagheri, Faezeh Shadfar, Fatemeh Barzegar, Seyed Davood Hoseini, Jamshid Yazdani Charati, Fatemeh Shaki
BACKGROUND AND OBJECTIVE: Today, the role of oxidative stress in development of schizophrenia has gained attention. Also, some atypical antipsychotic agents showed antioxidant properties. Therefore, in this study, we evaluated the level of oxidative stress parameters between patients treated with perphenazine, clozapine and risperidone and their relationship with schizophrenia symptoms' severity. MATERIALS AND METHODS: This was a descriptive study on 100 patients with chronic schizophrenia...
April 24, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29502389/second-generation-antipsychotic-and-diabetes-mellitus-in-children-and-adolescents
#3
Carlo Ripoli, Anna Paola Pinna, Faustina Podda, Roberta Zanni, Maria Giada Tronci, Anna Maria Nurchi
Second generation antipsychotics (SGA) are used in children for the treatment of various psychiatric diseases, including pervasive developmental disorders. These drugs can cause metabolic effects as hyperglycemia and diabetes. A 16-year-old young-boy, diagnosed with autism, developed diabetes mellitus type 1 whilst he was on treatment with olanzapine (started 4 months before), clomipramine, valproic acid and lithium. The hypothesis of druginduced diabetes imposed olanzapine interruption and clozapine initiation...
December 13, 2017: La Pediatria Medica e Chirurgica: Medical and Surgical Pediatrics
https://www.readbyqxmd.com/read/29477703/latent-toxoplasma-gondii-infection-is-associated-with-decreased-serum-triglyceride-to-high-density-lipoprotein-cholesterol-ratio-in-male-patients-with-schizophrenia
#4
Marina Sagud, Suzana Vlatkovic, Dubravka Svob Strac, Mario Sviben, Maja Zivkovic, Maja Vilibic, Bjanka Vuksan-Cusa, Alma Mihaljevic-Peles, Nela Pivac
BACKGROUND: Previous studies suggested a complex association between Toxoplasma gondii (TG) infection and host lipid metabolism. Both TG infection and metabolic disturbances are very common in patients with schizophrenia, but this relationship is not clear. METHODS: In this cross-sectional study, we evaluated the association between TG seropositivity, serum lipid levels, body mass index (BMI) and metabolic syndrome (MetS) in 210 male inpatients with schizophrenia...
April 2018: Comprehensive Psychiatry
https://www.readbyqxmd.com/read/29275180/effect-of-clozapine-dose-and-concentration-on-fasting-concentration-of-appetite-regulating-peptides
#5
Aleksandra Margulska, Elżbieta Kozłowska, Adam Wysokiński
The aim of this study is to analyze whether clozapine serum concentration may affect fasting serum levels of several appetite regulating peptides: CART, PYY(1-36), NPY, AgRP, des-acylated ghrelin, leptin and obestatin. Serum concentration of clozapine and fasting serum levels of des-acylated ghrelin, neuropeptide Y (NPY), agouti-related protein (AgRP), peptide YY (PYY(1-36)), cocaine- and amphetamine-regulated transcript (CART), leptin and obestatin were measured in 30 subjects with schizophrenia on clozapine monotherapy...
December 10, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/29225331/elevated-peripheral-expression-of-neuregulin-1-nrg1-mrna-isoforms-in-clozapine-treated-schizophrenia-patients
#6
Md Shaki Mostaid, Ting Ting Lee, Gursharan Chana, Suresh Sundram, Cynthia Shannon Weickert, Christos Pantelis, Ian Everall, Chad Bousman
Differential expression of neuregulin-1 (NRG1) mRNA isoforms and proteins has been reported in schizophrenia, primarily in post-mortem brain tissue. In this study, we examined 12 NRG1 SNPs, eight NRG1 mRNA isoforms (type I, type I(Ig2) , type II, type III, type IV, EGFα, EGFβ, pan-NRG1) in whole blood, and NRG1-β1 protein in serum of clozapine-treated schizophrenia patients (N = 71) and healthy controls (N = 57). In addition, using cultured peripheral blood mononuclear cells (PBMC) from 15 healthy individuals, we examined the effect of clozapine on NRG1 mRNA isoform and protein expression...
December 11, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/29200570/clozapine-induced-acute-hypertriglyceridemia
#7
Mitesh Kumar, Ajeet Sidana
The aim of this study is to highlight the association between the use of clozapine and the early development of hypertriglyceridemia, a condition that substantially increases the risk of cardiovascular events and other medical complications. A 34-year-old female with a background history of schizophrenia presented with acute elevation of serum triglycerides and cholesterol within 2 weeks of starting clozapine. Her metabolic parameters normalized following discontinuation of clozapine. Possible hypotheses for lipid dysregulation with atypical antipsychotics include weight gain, dietary changes, and development of glucose intolerance; however, some other factors may be responsible for this rapid escalation of lipid levels...
September 2017: Indian Journal of Psychological Medicine
https://www.readbyqxmd.com/read/29121457/brief-report-drugs-implicated-in-systemic-autoimmunity-modulate-neutrophil-extracellular-trap-formation
#8
Jorge A Irizarry-Caro, Carmelo Carmona-Rivera, Daniella M Schwartz, Sami S Khaznadar, Mariana J Kaplan, Peter C Grayson
OBJECTIVE: Aberrant neutrophil extracellular trap (NET) formation has been implicated as a mechanism to induce autoreactivity in individuals at risk of autoimmune diseases. The objective of this study was to assess whether medications implicated in cases of drug-induced autoimmunity (hydralazine and procainamide) and medications less commonly associated with drug-induced autoimmunity (minocycline and clozapine) induce NET formation and/or prevent NET degradation. METHODS: Human neutrophils were incubated with the drugs of interest and resultant NET formation was quantified by fluorescent microscopy...
March 2018: Arthritis & Rheumatology
https://www.readbyqxmd.com/read/29046626/curcumin-activates-ampk-pathway-and-regulates-lipid-metabolism-in-rats-following-prolonged-clozapine-exposure
#9
Zhen Liu, Changmeng Cui, Pengfei Xu, Ruili Dang, Hualin Cai, Dehua Liao, Mengqi Yang, Qingyan Feng, Xin Yan, Pei Jiang
Clozapine (CLO) remains an ultimate option for patients with treatment resistant schizophrenia. However, the atypical antipsychotic is often associated with serious metabolic side effects, such as dyslipidemia. Hepatic sterol regulatory element-binding proteins (SREBPs) are central in the allosteric control of a variety of lipid biosynthetic pathways. There is emerging evidence that CLO can activate SREBP pathway and enhance downstream lipogenesis, whereas curcumin (CUR), a major active compound of Curcuma longa , contains hypolipidemic properties...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28948574/correlation-between-serum-concentrations-of-n-desmethylclozapine-and-granulocyte-levels-in-patients-with-schizophrenia-a-retrospective-observational-study
#10
Robert L Smith, Tore Haslemo, Ole A Andreassen, Erik Eliasson, Marja-Liisa Dahl, Olav Spigset, Espen Molden
BACKGROUND: Clozapine is restricted to use in patients with treatment-refractory schizophrenia due to the risk of a serious drop in absolute neutrophil granulocyte count (ANC). The formation of reactive, unstable metabolites (adducts) has been suggested as a mechanism of clozapine-induced granulocyte decline. These adducts are not detectable in vivo, but stable clozapine metabolites could potentially be indirect pharmacokinetic measures of adduct formation. OBJECTIVE: The present retrospective observational study investigated the correlation between concentrations of N-desmethylclozapine, the major stable clozapine metabolite, and ANC in a real-life population of clozapine-treated patients...
November 2017: CNS Drugs
https://www.readbyqxmd.com/read/28919802/abcb1-and-abcc1-single-nucleotide-polymorphisms-in-patients-treated-with-clozapine
#11
Irina Piatkov, Dorgival Caetano, Yolinda Assur, Sue Lynn Lau, Trudi Jones, Steven C Boyages, Mark McLean
Clozapine (CZ) has superior efficacy to other antipsychotic agents in the treatment of schizophrenia and has been extensively used in clinical practice. ATP-binding cassette (ABC) transporter proteins are responsible for the distribution of various molecules as well as drugs across extracellular and intracellular membranes, including the blood-brain barrier. Genetic variations in these proteins can account for differences in treatment response. We investigated the influence of ABCB1 rs1045642 and ABCC1 rs212090 single-nucleotide polymorphisms (SNPs) on CZ serum level, clinical outcome, and changes in body mass index (BMI) in the first year of CZ treatment...
2017: Pharmacogenomics and Personalized Medicine
https://www.readbyqxmd.com/read/28865402/effects-of-age-and-gender-on-the-serum-levels-of-clozapine-olanzapine-risperidone-and-quetiapine
#12
I Castberg, A A Westin, E Skogvoll, O Spigset
OBJECTIVE: To investigate serum concentrations of second-generation antipsychotics in relation to age and gender in a population ranging from 18 to 100 years. METHOD: Results from a routine therapeutic drug monitoring database were retrieved, and 43 079 samples from 11 968 patients were included (17 249 samples for clozapine, 16 171 samples for olanzapine, 5343 samples for risperidone, and 4316 samples for quetiapine). The dose-adjusted concentration was used as the primary target variable...
November 2017: Acta Psychiatrica Scandinavica
https://www.readbyqxmd.com/read/28821358/on-the-brink-of-precision-medicine-for-psychosis-treating-the-patient-not-the-disease-a-commentary-on-association-between-serum-levels-of-glutamate-and-neurotrophic-factors-and-response-to-clozapine-treatment-by-krivoy-et-al-2017
#13
https://www.readbyqxmd.com/read/28818421/erbb-signaling-antagonist-ameliorates-behavioral-deficit-induced-by-phencyclidine-pcp-in-mice-without-affecting-metabolic-syndrome-markers
#14
Hagar Tadmor, Idit Golani, Ravid Doron, Ilana Kremer, Alon Shamir
Schizophrenia is a severe syndrome that affects about 1% of the world population. Since the mid-1950s, antipsychotics have been used to treat schizophrenia with preference for treating positive symptoms; however, their tolerance level is low, there are numerous side effects, and only some patients respond to the treatment. Antipsychotic medications that are more effective, better tolerated, and with fewer adverse effects are urgently needed. Given the accumulating evidence of the role filled by the ErbB signaling network in the biology of the dopamine, GABA, and glutamate systems, and in the etiology of schizophrenia, we hypothesized that the ErbB network is a candidate for development of a novel agent through which various symptoms of schizophrenia and other psychiatric disorders might be treated...
March 2, 2018: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28664816/cyp2c19-17-protects-against-metabolic-complications-of-clozapine-treatment
#15
Irina Piatkov, Dorgival Caetano, Yolinda Assur, Sue Lynn Lau, Micheline Coelho, Trudi Jones, Tristan Nguyen, Steven Boyages, Mark McLean
OBJECTIVES: Clozapine (CZ) is the most effective drug for managing treatment-resistant schizophrenic disorders. Its use has been limited due to adverse effects, which include weight gain and new-onset diabetes, but the incidence of these varies between patients. METHODS: We investigated 187 Clozapine Clinic patients (of whom 137 consented for genotyping) for the presence of CYP2C19*17 and its association with CZ and norclozapine (NCZ) levels, and clinical outcomes...
July 18, 2017: World Journal of Biological Psychiatry
https://www.readbyqxmd.com/read/28643331/treatment-with-antipsychotics-in-pregnancy-changes-in-drug-disposition
#16
Andreas A Westin, Malin Brekke, Espen Molden, Eirik Skogvoll, Ingrid Castberg, Olav Spigset
Although pregnancy is known to cause changes in drug pharmacokinetics, little is known about its impact on serum levels of antipsychotics. In this study we retrospectively assessed 201 routine serum antipsychotic therapeutic drug monitoring concentration measurements obtained from a total of 110 pregnancies in 103 women, and 512 measurements from the same women before and after pregnancy. Serum concentrations in the third trimester were significantly lower than baseline for quetiapine (-76%; confidence interval (CI), -83%, -66%; P < 0...
March 2018: Clinical Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28613395/clozapine-dose-for-schizophrenia
#17
REVIEW
Selvizhi Subramanian, Birgit A Völlm, Nick Huband
BACKGROUND: Schizophrenia and related disorders such as schizophreniform and schizoaffective disorder are serious mental illnesses characterised by profound disruptions in thinking and speech, emotional processes, behaviour and sense of self. Clozapine is useful in the treatment of schizophrenia and related disorders, particularly when other antipsychotic medications have failed. It improves positive symptoms (such as delusions and hallucinations) and negative symptoms (such as withdrawal and poverty of speech)...
June 14, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28599751/association-between-serum-levels-of-glutamate-and-neurotrophic-factors-and-response-to-clozapine-treatment
#18
Amir Krivoy, Eldar Hochman, Kyra-Verena Sendt, Sarah Hollander, Yael Vilner, Mirjana Selakovic, Abraham Weizman, Michal Taler
Clozapine is the only available therapy for about 30% of schizophrenia patients otherwise refractory to antipsychotics. Unfortunately, the mechanism of action of the drug is still unknown and there are no biomarkers that can predict a positive response to clozapine. We aimed to examine serum neurotrophins and glutamate levels as putative biomarkers for clozapine response based on the hypothesized mode-of-action of the compound. Blood samples of 89 chronic schizophrenia patients maintained on clozapine were analyzed in a cross-sectional design...
February 2018: Schizophrenia Research
https://www.readbyqxmd.com/read/28552881/vitamin-d-deficiency-and-associated-factors-in-patients-with-mental-disorders-treated-in-routine-practice
#19
Svetlana Ristic, Sandra Zivanovic, Dragan R Milovanovic, Vladimir Janjic, Danijela Djokovic, Ana Jovicevic, Marijana Stanojevic Pirkovic, Sanja Kocic
This research aimed to investigate factors associated with vitamin D deficiency and to provide data about its prevalence in patients suffering from different psychiatric illnesses. The study had a cross-sectional design and it included 220 patients of both genders, aged from 19-81 y, with a wide range of mental disorders (F00-F89), and treated in routine ambulatory and hospital practice. The researchers collected data from three sources: medical records, a study questionnaire and biochemical analysis of patients' serum samples (concentration of vitamin D measured as 25(OH)D, calcium, phosphorus, magnesium, sodium and potassium)...
2017: Journal of Nutritional Science and Vitaminology
https://www.readbyqxmd.com/read/28412661/reliable-clinical-serum-analysis-with-reusable-electrochemical-sensor-toward-point-of-care-measurement-of-the-antipsychotic-medication-clozapine
#20
Mijeong Kang, Eunkyoung Kim, Thomas E Winkler, George Banis, Yi Liu, Christopher A Kitchen, Deanna L Kelly, Reza Ghodssi, Gregory F Payne
Clozapine is one of the most promising medications for managing schizophrenia but it is under-utilized because of the challenges of maintaining serum levels in a safe therapeutic range (1-3μM). Timely measurement of serum clozapine levels has been identified as a barrier to the broader use of clozapine, which is however challenging due to the complexity of serum samples. We demonstrate a robust and reusable electrochemical sensor with graphene-chitosan composite for rapidly measuring serum levels of clozapine...
September 15, 2017: Biosensors & Bioelectronics
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