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Innotest sandwich elisa

Manufactured by Fujirebio
Sourced in Belgium

The INNOTEST sandwich ELISA is a laboratory equipment product designed for the detection and quantification of specific analytes in biological samples. It utilizes the enzyme-linked immunosorbent assay (ELISA) technique to provide accurate and sensitive measurements. The core function of this product is to facilitate the analysis of target molecules through the specific binding of antibodies and the generation of a measurable signal.

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7 protocols using innotest sandwich elisa

1

CSF Biomarkers for Alzheimer's Diagnosis

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CSF was acquired following standard procedures. The CSF was obtained by LP between the L3/L4 or L4/L5 intervertebral space, using a 22-gauge atraumatic needle. Five hundred microlitres of CSF were used to perform standardised commercially available INNOTEST sandwich ELISA according to the manufacturer’s instructions (Fujirebio Europe NV, formerly Innogenetics NV). A CSF profile of the Alzheimer’s type was defined by a phosphorylated tau/Aß42 ratio >0.11.6 26 (link) CSF biomarkers results were available in the ECR database but not in the BNA.
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2

Standardized CSF Collection and Analysis Protocols

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CSF from individuals with AD and AMC in the WashU‐A cohort were collected via a catheter as previously described.21 (link) CSF from AMC and individuals with symptomatic AD, PSP, CBS, and bvFTD in the WashU‐B cohort were obtained via LP with gravity collection and centrifugation as previously described.22 (link) CSF from MAPT mutation families was collected according to the standardized protocol at the Biomarker Core at the Washington University School of Medicine.32 CSF from individuals with brain tumors was obtained via lumbar drain using a catheter before or after surgery.
CSF from the Montpellier cohort was collected using the standardized protocol for the collection, centrifugation, and storage at Memory Resources and Research Center of Montpellier.33 (link), 34 (link), 35 (link) Briefly, the atraumatic needle was used for LP, with CSF collected into 10 mL polypropylene tube (ref 62.610.201, Sarstedt, Germany) and protein low binding Eppendorf® tubes (LoBind microtubes Eppendorf, ref 022431064, Hamburg, Germany). CSF was not centrifuged before aliquoting and storage at −80°C. CSF tau and pT181 concentrations were measured using the standardized commercially available INNOTEST sandwich ELISA X‐MAP following Fujirebio instructions. CSF Aβ 42 and Aβ 40 were measured using INNOTEST sandwich ELISA from Fujirebio.
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3

CSF Biomarker Measurement for Alzheimer's

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CSF biomarkers were measured using standardized commercial Innotest sandwich ELISA (Fujirebio, n = 152) or Euroimmun ELISA method (n = 2) according to the manufacturer’s instructions. Sandwich ELISA relies on two antibodies for detection, one targeting the first 6 N-terminal amino acids (3D6) and the second the 6 C-terminal amino acids (21F12). The Aβ42/40 cutoff used to distinguish Aβ+ from Aβ individuals was 0.05, as preconized for clinical setting [23 (link)]. For the AT(N) research framework, participants were considered “A+” if CSF Aβ42 was < 500/700 pg/ml depending on the nature of the polypropylene collection tubes or if CSF Aβ42/40 ratio < 0.05/0.1 according to ELISA technic [24 (link), 25 (link)]; “T+” if CSF p-tau181 was > 60 pg/ml; and N+ if CSF t-tau was > 400 pg/ml.
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4

Retrospective Study of Amnestic AD and bvFTLD

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We performed a retrospective study (2007–2014) collecting patients with an initial clinical suspicion of amnestic AD or bvFTLD with onset after 65 years, from the CSF database of the Gui de Chauliac University Hospital (N = 518). All the patients signed a written informed consent approved by the local ethics committee (registered DC-2008-417). We considered only patients with available clinical and CSF data (n = 152). To limit possible confounding factors and alternative diagnosis, patients with psychiatric conditions able to explain the cognitive and behavioral alterations or with severe vascular burden (Fazekas score = 3) [10] (link), [11] (link) were excluded, as well as patients with prominent aphasic or extrapyramidal presentations; 44 patients were finally retained.
CSF was collected in polypropylene tubes with standardized conditions [12] . CSF Aβ142, T-tau, and P-tau were simultaneously measured in every sample using standardized commercially available Innotest sandwich ELISA according to manufacturer's procedures (Fujirebio Ghent Belgium).
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5

Cerebrospinal Fluid Biomarker Analysis

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Lumbar puncture was offered to all participants but was not mandatory, and CSF centralized measurements of β-amyloid 42 peptide (Aβ42), Aβ40, total tau, and phosphorylated tau levels were performed using the standardized INNOTEST sandwich ELISA (Fujirebio).
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6

CSF Amyloid-β1-42 Measurement Protocol

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CSF was collected at baseline by lumbar puncture using a 25-gauge needle in polypropylene tubes (Sarstedt, Nümbrecht, Germany). CSF was centrifuged at 1800 × g for 10 min at 4 °C and stored at – 20 °C until biomarker analysis, within 2 months after collection. CSF Aβ1–42 was measured using InnoTest sandwich ELISAs (Innogenetics, Fujirebio, Ghent, Belgium) [25 (link)]. Subjects were classified as amyloid positive or negative with a cut-off point of CSF Aβ1–42 < 640 ng/L [26 (link)].
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7

CSF Biomarkers for Alzheimer's Evaluation

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Collection of CSF by lumbar puncture for all subjects was performed as described previously (Van Der Flier et al., 2014). Aβ1–42, phosphorylated tau (p‐tau), and total tau protein concentrations were measured using InnoTest sandwich ELISAs (Innogenetics, Fujirebio, Ghent, Belgium). The cut‐off for abnormal drift‐corrected CSF Aβ1–42 was set at <813 ng/L (Tijms et al., 2018), at >375 ng/L for CSF total tau and at >52 ng/L for p‐tau (Mulder et al., 2010).
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