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Minami K, Masutani R, Suzuki Y, Kubota M, Osaka N, Nakanishi T, Nakano T, Ukimura A. Evaluation of SARS-CoV-2 RNA quantification by RT-LAMP compared to RT-qPCR. J Infect Chemother 2021; 27:1068-1071. [PMID: 34006453 PMCID: PMC8112399 DOI: 10.1016/j.jiac.2021.05.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Revised: 04/19/2021] [Accepted: 05/06/2021] [Indexed: 10/24/2022]
Abstract
INTRODUCTION Coronavirus disease 2019 (COVID-19) is a global pandemic caused by a novel virus, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The viral load of SARS-CoV-2 is associated with mortality in COVID-19 patients. Measurement of viral load requires the use of reverse transcription quantitative PCR (RT-qPCR), which in turn requires advanced equipment and techniques. In this study, we aimed to evaluate the viral load measurement using reverse transcription loop-mediated isothermal amplification (RT-LAMP), which is a simpler procedure compared to RT-qPCR. MATERIALS AND METHODS RNA was extracted by using the QIAamp Viral RNA Mini Kit. The RT-LAMP assay was performed by using the Loopamp® 2019-SARS-CoV-2 detection reagent kit and 10-fold serial dilutions of known viral load RT-LAMP were used to measure Tt, which is the time until the turbidity exceeds the threshold. Based on the relationship between viral load and Tt, the linearity and detection sensitivity of the calibration curve were evaluated. In addition, 117 clinical specimens were measured, and RT-qPCR and RT-LAMP assay results were compared. RESULTS The dilution linearity of the calibration curve was maintained at five orders of magnitude 1.0× 106 to 1.0 × 101 copies/μL, and was confirmed to be detectable down to 1.0 × 100 copies/μL. The limit of quantification of RNA extracted from clinical specimens using RT-LAMP correlated well with that obtained using RT-qPCR (r2 = 0.930). CONCLUSION The findings indicate that RT-LAMP is an effective method to determine the viral load of SARS-CoV-2.
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Affiliation(s)
- Kenta Minami
- Department of Central Clinical Laboratory, Osaka Medical College Hospital, Osaka, Japan; Infection Control Center, Osaka Medical College Hospital, Osaka, Japan.
| | - Ryota Masutani
- Department of Central Clinical Laboratory, Osaka Medical College Hospital, Osaka, Japan
| | - Youichi Suzuki
- Infection Control Center, Osaka Medical College Hospital, Osaka, Japan; Department of Microbiology and Infection Control, Osaka Medical College, Osaka, Japan
| | - Meri Kubota
- Department of Central Clinical Laboratory, Osaka Medical College Hospital, Osaka, Japan
| | - Naofumi Osaka
- Department of Central Clinical Laboratory, Osaka Medical College Hospital, Osaka, Japan
| | - Toyofumi Nakanishi
- Infection Control Center, Osaka Medical College Hospital, Osaka, Japan; Department of Clinical and Laboratory Medicine, Osaka Medical College, Osaka, Japan
| | - Takashi Nakano
- Infection Control Center, Osaka Medical College Hospital, Osaka, Japan; Department of Microbiology and Infection Control, Osaka Medical College, Osaka, Japan
| | - Akira Ukimura
- Department of Central Clinical Laboratory, Osaka Medical College Hospital, Osaka, Japan; Infection Control Center, Osaka Medical College Hospital, Osaka, Japan
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Kawamoto S, Masutani R, Kurata K, Shima E, Iwatani Y, Takubo T. Toll-like receptor 4 promoter polymorphisms in a familial mediterranean fever patient with asymptomatic bacteriuria. Clin Case Rep 2019; 7:155-159. [PMID: 30656032 PMCID: PMC6333084 DOI: 10.1002/ccr3.1941] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Accepted: 11/06/2018] [Indexed: 11/13/2022] Open
Abstract
A periodic fever, due to inherited inflammatory disorders, can be misdiagnosed as a common infection, when a possible pathogen is detected from a patient. TLR4 SNPs that are responsible for asymptomatic bacteriuria might disturb the pathophysiology of familial Mediterranean fever without MEFV mutations.
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Affiliation(s)
- Shinichiro Kawamoto
- Department of Transfusion Medicine and Cell TherapyKobe University HospitalHyogoJapan
| | - Ryota Masutani
- Department of Central Clinical LaboratoryOsaka Medical College HospitalOsakaJapan
- Department of Biomedical Informatics, Division of Health SciencesOsaka University Graduate School of MedicineOsakaJapan
| | - Keiji Kurata
- Department of Medical Oncology/HematologyKobe University HospitalHyogoJapan
| | - Etsuko Shima
- Department of General MedicineKobe Central HospitalHyogoJapan
| | - Yoshinori Iwatani
- Department of Biomedical Informatics, Division of Health SciencesOsaka University Graduate School of MedicineOsakaJapan
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Kawamoto S, Kamesaki T, Masutani R, Kitao A, Hatanaka K, Imakita M, Tamaki T, Takubo T. Ectopic expression of band 3 anion transport protein in colorectal cancer revealed in an autoimmune hemolytic anemia patient. Hum Pathol 2019; 83:193-198. [DOI: 10.1016/j.humpath.2018.07.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Revised: 06/26/2018] [Accepted: 07/10/2018] [Indexed: 11/30/2022]
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Masutani R, Ikemoto T, Maki A, Tanada H, Iwatani Y, Watanabe M, Takubo T, Okada Y. Mean platelet component and mean platelet volume as useful screening markers for myelodysplastic syndrome. Health Sci Rep 2018; 1:e50. [PMID: 30623074 PMCID: PMC6266360 DOI: 10.1002/hsr2.50] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 03/19/2018] [Accepted: 04/06/2018] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Hematologic disorders, including myelodysplastic syndrome (MDS), are difficult to identify in routine hematologic examinations using automated hematology analyzers. However, the practical uses of mean platelet component and mean platelet volume (MPV) measured by these analyzers as screening markers for MDS, remain unclear. METHODS Mean platelet component and MPV values were measured in the peripheral blood of patients with MDS, aplastic anemia, idiopathic thrombocytopenic purpura, myeloproliferative neoplasms, and in healthy controls using an automated hematologic analyzer. Cutoff values for discriminating between the MDS group and healthy controls were determined by recursive partitioning analysis. RESULTS Mean platelet component was significantly lower in MDS patients compared with controls, while MPV was significantly higher. Combined cutoff values for MDS diagnosis of <25.3 g/dL for mean platelet component and >10.0 fL for MPV showed a specificity and positive predictive value of 99.9% and 99.1%, respectively. These cutoff values also differentiated between MDS and diagnoses of aplastic anemia, idiopathic thrombocytopenic purpura, and myeloproliferative neoplasms. CONCLUSION Mean platelet component and MPV may, thus, be useful and convenient screening markers for MDS.
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Affiliation(s)
- Ryota Masutani
- Department of Central Clinical LaboratoryOsaka Medical College HospitalTakatsukiOsakaJapan
- Department of Biomedical Informatics, Division of Health SciencesOsaka University Graduate School of MedicineSuitaOsakaJapan
| | - Toshiyuki Ikemoto
- Department of Central Clinical LaboratoryOsaka Medical College HospitalTakatsukiOsakaJapan
| | - Ayako Maki
- Department of Central Clinical LaboratoryOsaka Medical College HospitalTakatsukiOsakaJapan
| | - Hiroko Tanada
- Department of Central Clinical LaboratoryOsaka Medical College HospitalTakatsukiOsakaJapan
| | - Yoshinori Iwatani
- Department of Biomedical Informatics, Division of Health SciencesOsaka University Graduate School of MedicineSuitaOsakaJapan
| | - Mikio Watanabe
- Department of Biomedical Informatics, Division of Health SciencesOsaka University Graduate School of MedicineSuitaOsakaJapan
| | - Takayuki Takubo
- Department of Central Clinical LaboratoryOsaka Medical College HospitalTakatsukiOsakaJapan
| | - Yoshikatsu Okada
- Department of Central Clinical LaboratoryOsaka Medical College HospitalTakatsukiOsakaJapan
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Kotani T, Masutani R, Suzuka T, Oda K, Makino S, Ii M. Anti-inflammatory and anti-fibrotic effects of intravenous adipose-derived stem cell transplantation in a mouse model of bleomycin-induced interstitial pneumonia. Sci Rep 2017; 7:14608. [PMID: 29097816 PMCID: PMC5668313 DOI: 10.1038/s41598-017-15022-3] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 10/20/2017] [Indexed: 12/15/2022] Open
Abstract
Adipose-derived stem cells (AdSCs) have recently been considered a useful treatment tool for autoimmune disease because of their anti-inflammatory and immunosuppressive effects. We investigated the therapeutic effect of intravenous AdSC transplantation in a mouse model of bleomycin-induced lung injury. AdSCs accumulated in the pulmonary interstitium and inhibited both inflammation and fibrosis in the lung, markedly improving the survival rate of mice with bleomycin-induced lung injury in a cell number-dependent manner. AdSCs inhibited the production of pro-inflammatory cytokines such as TNF-α and IL-12 in activated macrophages, and AdSCs also induced the apoptosis of activated macrophages. AdSCs inhibited the differentiation and proliferation of Th2-type mCD4+ T cells but promoted the differentiation and proliferation of regulatory T cells, suggesting that the phenotypic conversion of T cells may be one of the mechanisms for the anti-inflammatory effect of AdSCs on pulmonary fibrosis. These findings suggest that intravenous AdSCs could be a promising treatment for patients with interstitial pneumonia.
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Affiliation(s)
- Takuya Kotani
- Department of Internal Medicine (IV), Osaka Medical College, Osaka, Japan
| | - Ryota Masutani
- Division of Central Laboratory, Osaka Medical College, Osaka, Japan
| | - Takayasu Suzuka
- Department of Internal Medicine (IV), Osaka Medical College, Osaka, Japan
| | - Katsuhiro Oda
- Department of Internal Medicine (IV), Osaka Medical College, Osaka, Japan
| | - Shigeki Makino
- Department of Internal Medicine (IV), Osaka Medical College, Osaka, Japan
| | - Masaaki Ii
- Division of Research Animal Laboratory and Translational Medicine, Research and Development Center, Osaka Medical College, Osaka, Japan.
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Kurata K, Kawamoto S, Masutani R, Yakushijin K, Yamamoto K, Matsuoka H, Takubo T, Minami H. Abstract 463: MicroRNA-7 suppresses RB1 expression leading to chromosomal instability in leukemia cells harboring c-Kit mutation. Cancer Res 2017. [DOI: 10.1158/1538-7445.am2017-463] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
C-Kit mutation D816V is a well-known indicator of poor prognosis in acute myeloid leukemia (AML) harboring t(8;21) chromosomal translocations. However, the mechanism the D816V mutation promotes therapeutic resistance is still under investigation. C-Kit V814 mutation is a murine counterpart of the human D816V. We utilized a murine IL-3 dependent cell line Ba/F3 with or without the c-Kit V814 mutation to investigate its downstream signaling pathway and the effect on the expression of bcl-2 family members and critical granulocytic transcription factors. The c-Kit V814 and wild type (WT) c-Kit were retrovirally transduced into Ba/F3 cells. Unexpectedly, Gata1 mRNA was significantly downregulated to one-tenth in V814+Ba/F3 cells (p < 0.01), contrary to the previous reports that WT c-Kit signaling induces Gata1 expression. When V814+Ba/F3 cells were treated with several c-Kit signaling pathway inhibitors, mRNA and protein expression levels of Gata1 recovered to normal levels only with MEK 1/2 inhibitor (PD325901) treatment. We then hypothesized that miRNAs might control Gata1 transcription. We used an array to identify differences in miRNA expression between Ba/F3 cells and V814+Ba/F3 cells, and between V814+Ba/F3 cells treated with or without PD325901. Only miR-7a-5p and miR-706 were significantly upregulated in V814+Ba/F3 cells compared with Ba/F3 without the V814 mutation, and downregulated (> 2-fold) in cells treated with PD325901 compared with controls. We focused our further analysis on miR-7 as it is highly conserved in vertebrates. The differences in miR-7 expression were confirmed using qRT-PCR (10.5-fold change, p < 0.01). In silico analysis implicated Rb1 as a candidate miR-7 target that may regulate Gata1 transcription. Luciferase reporter constructs containing murine and human Rb1 miR-7 target sequence exhibited 0.51 and 0.49 times lower luciferase activity than the controls, respectively (p < 0.01). To further determine the biological significance of the c-Kit mutation that would transform the cells to more aggressive phenotype, we focused on DNA and chromosomal instability caused by RB1 deterioration. We exposed WT c-Kit Ba/F3 and V814+Ba/F3 cells to 4 Gy irradiation and then used immunohistochemistry to analyze the frequency of γH2AX foci in the cells. The percentage of cells with more than 10 γH2AX foci was significantly higher in V814+Ba/F3 cells than WT Ba/F3 cells (27% vs. 14%, p < 0.05), Here, we clearly show that a single mutation of c-Kit is sufficient to regulate miR-7 expression leading to RB1 translational suppression. Since c-Kit mutation requires only a single step to inhibit RB1, this mechanism is more likely to facilitate oncogenesis than bi-allelic RB1 chromosomal and/or gene alterations in leukemia cells. Taken together, we identified miR-7 as a suppressor of RB1 in V814 mutation-positive cells, which might reflect the responsibility of D816V to refractory feature in AML.
Citation Format: Keiji Kurata, Shinichiro Kawamoto, Ryota Masutani, Kimikazu Yakushijin, Katsuya Yamamoto, Hiroshi Matsuoka, Takayuki Takubo, Hironobu Minami. MicroRNA-7 suppresses RB1 expression leading to chromosomal instability in leukemia cells harboring c-Kit mutation [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 463. doi:10.1158/1538-7445.AM2017-463
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Otsu H, Watanabe M, Inoue N, Masutani R, Iwatani Y. Intraindividual variation of microRNA expression levels in plasma and peripheral blood mononuclear cells and the associations of these levels with the pathogenesis of autoimmune thyroid diseases. ACTA ACUST UNITED AC 2017; 55:626-635. [DOI: 10.1515/cclm-2016-0449] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 12/16/2016] [Indexed: 12/12/2022]
Abstract
AbstractBackground:microRNAs (miRNAs) circulate in the blood and negatively regulate the expression of mRNAs. Some miRNAs are associated with the development of autoimmune thyroid diseases (AITD); however, there are few reports on the association between miRNA expression and the pathogenesis of AITD or the physiological variations of circulating miRNAs, which are important to examine as biomarkers.Methods:We examined the circadian and day-to-day variations in the expression levels of 5 miRNAs (miR-125a, miR-146a, miR-155, let-7e and miR-106a) in plasma and peripheral blood mononuclear cells (PBMC). We also analysed the expression levels of two of these miRNAs (miR-146a and miR-155) in 20 healthy controls, 60 Graves’ disease (GD) patients and 50 Hashimoto’s disease (HD) patients.Results:For each miRNA, we observed wide intraindividual variation [coefficient of variation value (CV): 70%–100%] compared to measurement error (CV: 20%–40%). In patients with AITD, HD, GD in remission and mild HD, the expression levels of miR-146a in PBMC were increased 296%, 328%, 348% and 464% above the levels in healthy controls, respectively (p=0.0443 and p=0.0273, p=0.0267 and p=0.0052, respectively). In severe HD, the expression level of miR-155 in plasma was increased to 347% of that in healthy controls (p=0.0256).Conclusions:The expression levels of miRNAs in plasma and PBMC showed wide intraindividual variation. In addition, miR-146a may be associated with the development of AITD.
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Inoue N, Katsumata Y, Watanabe M, Ishido N, Manabe Y, Watanabe A, Masutani R, Hidaka Y, Iwatani Y. Polymorphisms and expression of toll-like receptors in autoimmune thyroid diseases. Autoimmunity 2016; 50:182-191. [DOI: 10.1080/08916934.2016.1261835] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Naoya Inoue
- Department of Biomedical Informatics, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka, Japan and
- Laboratory for Clinical Investigation, Osaka University Hospital, Osaka, Japan
| | - Yuka Katsumata
- Department of Biomedical Informatics, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka, Japan and
| | - Mikio Watanabe
- Department of Biomedical Informatics, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka, Japan and
| | - Naoko Ishido
- Department of Biomedical Informatics, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka, Japan and
| | - Yu Manabe
- Department of Biomedical Informatics, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka, Japan and
| | - Ayano Watanabe
- Department of Biomedical Informatics, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka, Japan and
| | - Ryota Masutani
- Department of Biomedical Informatics, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka, Japan and
| | - Yoh Hidaka
- Laboratory for Clinical Investigation, Osaka University Hospital, Osaka, Japan
| | - Yoshinori Iwatani
- Department of Biomedical Informatics, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka, Japan and
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Kotani T, Takeuchi T, Ishida T, Masutani R, Isoda K, Hata K, Yoshida S, Makino S, Hanafusa T. Increased Serum LIGHT Levels Correlate with Disease Progression and Severity of Interstitial Pneumonia in Patients with Dermatomyositis: A Case Control Study. PLoS One 2015; 10:e0140117. [PMID: 26448572 PMCID: PMC4598117 DOI: 10.1371/journal.pone.0140117] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Accepted: 09/22/2015] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Activated CD8+ T cells play an important role in the pathogenesis of dermatomyositis (DM) with interstitial pneumonia (IP). Serum CD8+ T-cell activator, LIGHT, and Th1/Th2/Th17 cytokines were measured in DM-IP patients and compared with clinical parameters to investigate their usefulness. METHODS The correlations between the clinical findings and serum LIGHT and Th1/Th2/Th17 cytokine levels were investigated in 21 patients with DM-IP (14 with rapidly progressive IP [RPIP] and 7 with chronic IP [CIP], including 4 fatal cases of IP). RESULTS The median serum LIGHT level was 119 (16-335.4) pg/ml, which was higher than that in healthy control subjects and DM patients without IP. The median serum IL-6 level was 14.7 (2.4-154.5) pg/ml (n = 13). The other cytokines were detected in only a few patients. The median serum LIGHT level in DM-RPIP patients (156 [49.6-335.4] pg/ml) was significantly higher than that in DM-CIP patients (94.3 [16-164.2] pg/ml) (P = 0.02). The serum IL-6 level did not correlate with either progression or outcome of DM-IP. ROC curve analysis determined a serum LIGHT level of ≥120 pg/ml to be the cut-off value for the rapid progression of DM-IP. Serum LIGHT levels correlated significantly with %DLco (R = 0.55, P = 0.04) and total ground-glass opacity scores (R = 0.72, P = 0.0002). The serum LIGHT level significantly decreased to 100.5 (12.4-259.3) pg/ml 4 weeks after treatment initiation (P = 0.04). CONCLUSIONS The serum LIGHT level may be a promising marker of disease progression and severity in patients with DM-IP.
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Affiliation(s)
- Takuya Kotani
- Department of Internal Medicine (I), Osaka Medical College, Takatsuki, Osaka, Japan
- * E-mail:
| | - Tohru Takeuchi
- Department of Internal Medicine (I), Osaka Medical College, Takatsuki, Osaka, Japan
| | - Takaaki Ishida
- Department of Internal Medicine (I), Osaka Medical College, Takatsuki, Osaka, Japan
| | - Ryota Masutani
- Department of Central Laboratory, Osaka Medical College, Takatsuki, Osaka, Japan
| | - Kentaro Isoda
- Department of Internal Medicine (I), Osaka Medical College, Takatsuki, Osaka, Japan
| | - Kenichiro Hata
- Department of Internal Medicine (I), Osaka Medical College, Takatsuki, Osaka, Japan
| | - Shuzo Yoshida
- Department of Internal Medicine (I), Osaka Medical College, Takatsuki, Osaka, Japan
| | - Shigeki Makino
- Department of Internal Medicine (I), Osaka Medical College, Takatsuki, Osaka, Japan
| | - Toshiaki Hanafusa
- Department of Internal Medicine (I), Osaka Medical College, Takatsuki, Osaka, Japan
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Kotani T, Takeuchi T, Ishida T, Masutani R, Isoda K, Hata K, Makino S, Hanafusa T. SAT0479 Increased Serum Light Levels Correlate with Disease Progression and Severity of Interstitial Pneumonia in Patients with Dermatomyositis. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.2123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Tanada H, Ikemoto T, Masutani R, Tanaka H, Takubo T. Evaluation of the automated hematology analyzer ADVIA® 120 for cerebrospinal fluid analysis and usage of unique hemolysis reagent. Int J Lab Hematol 2013; 36:83-91. [PMID: 23937551 DOI: 10.1111/ijlh.12130] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Accepted: 06/12/2013] [Indexed: 11/30/2022]
Abstract
INTRODUCTION In this study, we evaluated the performance of the ADVIA 120 hematology system for cerebrospinal fluid (CSF) assay. METHODS Cell counts and leukocyte differentials in CSF were examined with the ADVIA 120 hematology system, while simultaneously confirming an effective hemolysis agent for automated CSF cell counts. RESULTS The detection limits of both white blood cell (WBC) counts and red blood cell (RBC) counts on the measurement of CSF cell counts by the ADVIA 120 hematology system were superior at 2 cells/μL (10(-6) L). The WBC count was linear up to 9.850 cells/μL, and the RBC count was linear up to approximately 20 000 cells/μL. The intrarun reproducibility indicated good precision. The leukocyte differential of CSF cells, performed by the ADVIA120 hematology system, showed good correlation with the microscopic procedure. The VersaLyse hemolysis solution efficiently lysed the samples without interfering with cell counts and leukocyte differential, even in a sample that included approximately 50 000/μL RBC. CONCLUSION These data show the ADVIA 120 hematology system correctly measured the WBC count and leukocyte differential in CSF. The VersaLyse hemolysis solution is considered to be optimal for hemolysis treatment of CSF when measuring cell counts and differentials by the ADVIA 120 hematology system.
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Affiliation(s)
- H Tanada
- Central Clinical Laboratory, Osaka Medical College Hospital, Osaka, Japan
| | - T Ikemoto
- Central Clinical Laboratory, Osaka Medical College Hospital, Osaka, Japan
| | - R Masutani
- Central Clinical Laboratory, Osaka Medical College Hospital, Osaka, Japan
| | - H Tanaka
- Central Clinical Laboratory, Osaka Medical College Hospital, Osaka, Japan
| | - T Takubo
- Department of Clinical and Laboratory Medicine, Osaka Medical College, Osaka, Japan
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