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Antibody and immunoassays for determining the presence of delta9-tetrahydrocannabinol

an antibody and immunoassay technology, applied in the field of drugs of abuse, can solve the problems of high sensitivity, inability to meet the expected sensitivity requirement of the substance abuse and mental health services administration, and inability to use saliva thc assays and procedures

Inactive Publication Date: 2010-07-22
AGILENT TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides an antibody that specifically binds to THC and its metabolites, which can be used in various applications such as detecting the presence of THC in a sample. The antibody has been produced using CDR amino acid sequences selected from a group of CDR sequences. The invention also provides a host cell that expresses the antibody, as well as an immunoassay for detecting THC and its metabolites using the antibody. The technical effects of the invention include improved detection and analysis of THC and its metabolites, which can be useful in various fields such as drug testing and forensic science.

Problems solved by technology

The use of saliva THC assays and procedures however are still problematic.
Due to the short detectable time window of the parent THC in the oral fluid, low quantity, the low THC solubility and “stickiness” in aqueous solution, and sensitivity limitations of currently available murine anti-THC antibodies, current lateral flow immunoassays for parent THC can not meet the expected sensitivity requirement recommended by the Substance Abuse and Mental Health Services Administration (SAMHSA).
However, this assay requires the presence of the THC metabolite THC-COOH, and does not detect the parent Δ9-THC molecule with a high sensitivity.
However, this assay system cannot be used to detect the parent Δ9-THC molecule in saliva and requires urine collection and testing.
However, fluorescence detection is required for this assay, necessitating the use of expensive equipment and limiting the availability and widespread usage of this assay.
Using a Δ9-THC-based or Δ9-THC-analog based tracers is problematic because the Δ9-THC analyte does not effectively displace the Δ9-THC-based or Δ9-THC-analog based tracer.
This results in a lower sensitivity of the assay.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of a Rabbit Monoclonal Antibody Having Specific Binding for THC

[0101]An antibody having specific binding for THC was prepared by the following procedures:

Immunization

[0102]New Zealand White rabbits were immunized. Rabbits were injected subcutaneously with 0.4 mg of THC-KLH in complete Freund's adjuvant. After the initial immunization, animals were boosted 5 more times every 21 days in the same manner with incomplete Freund's adjuvant and the sera tested by immunoassay and immunohistochemical staining. The rabbit with the best titer in the immunoassay and IHC (immunohistochemistry) was selected for a final intravenous boost of 0.4 mg of THC-KLH in saline, four days before removal of the spleen.

Hybridization, Fusion

[0103]Fusions were performed using conventional methodology: 1.5-3×108 lymphocytes from an immunized rabbit and the fusion partner (240E-w) were fused at a ratio of 2:1 with PEG 4000 at 37° C. in serum-free medium. The cells were distributed in 96-well cell cult...

example 2

cDNA Cloning from Rabbit Hybridoma and Recombinant Antibody Expression

[0107]mRNA was isolated from rabbit hybridomas by using Qiagen TurboCapture mRNA kit. cDNA was made directly in the TurboCapture tube by solid phase synthesis. Rabbit IgG cDNAs were amplified with heavy or light chain specific primers by PCR. For L chain, the PCR product was sequenced and a consensus sequence was found from three independent mRNA and PCR reactions. To make an expression construct, the PCR product was digested with restriction enzymes and cloned into an expression vector. A cDNA clone with the consensus PCR sequence was selected for expression. For H chain, only the variable region (VH) was amplified and the PCR product was digested with the fusion partner VH specific restriction enzyme. Rabbit B-cell VH cDNA was purified and recovered from an agarose gel. In order to identify a desired cDNA clone, the purified VH product was cloned into pCR 2.1-TOPO vector (Invitrogen) and cDNA clones were screene...

example 3

Design of a Lateral Flow Immunoassay System Using a Rabbit Monoclonal Antibody for the Detection of THC in Saliva

[0113]Antibodies to be utilized in lateral flow immunoassay systems were conjugated to particles that can be visualized. Conjugation conditions were tested for each antibody lot, and monobasic / dibasic phosphate buffer pH was adjusted to optimize the conjugation, which was typically between pH 6.5 and 8.5. Antibody was diluted to 0.1 mg / ml using monobasic / dibasic phosphate buffer at room temperature and mixed with gold particles (30 nm) in the proportion 20 μl antibody per 1 mL gold for 5 minutes. 10% BSA was added to create a 1:10 dilution BSA: total volume Gold solution, and mixing was continued for five (5) minutes. The sample was centrifuged at 10,000 rpm at 4° C. for forty (40) minutes, and the supernatant removed to achieve a final suspension at 10% (w / w) gold. The gold conjugated antibodies are then utilized in the lateral flow immunoassay system, such as the system...

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Abstract

Antibodies having specific binding for the parent THC (Δ9-THC) and its major metabolites are provided which present a significant increase in sensitivity of immunoassays such as lateral flow immunoassays and ELISA for THC. The present invention also provides a rabbit hybridoma producing the antibody as a monoclonal antibody, a recombinant antibody, further molecularly engineered recombinant antibodies against parent Δ9-THC and its metabolites and cell lines producing the recombinant antibodies. The invention also provides applications of the antibody in immunoassays, particularly lateral flow immunoassays, specifically applications in detecting THC in body fluids, particularly saliva, and kits for determining the presence of THC.

Description

FIELD OF THE INVENTION[0001]This invention relates generally to immunoassays for drugs of abuse and the like.BACKGROUND OF THE INVENTION[0002]Marijuana is a member of the hemp family and is known to contain significant amounts of cannabinoids. In particular, the most important cannabinoid is Δ9-Tetrahydrocannabinol (Δ9-THC), the major physiologically active constituent of marijuana. Δ9-THC is a controlled substance because it has both sedative and depressant-like effects on the cardiovascular and central nervous systems, as opposed to cannabidiol, a non-psychoactive constituent of marijuana. Through smoking marijuana, Δ9-THC is rapidly absorbed from the lungs into the blood stream and metabolized through 11-norΔ9-THC to a series of polar metabolites with 11-nor-Δ9-THC-carboxylic acid as the primary metabolite.[0003]Due to the common abuse of cannabinoids, there is a need for non-invasive and rapid tests to detect the presence of these controlled drugs in biological specimens. Curren...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01N33/53C07K16/00C12N5/16
CPCC07K16/16C07K2317/56C07K2317/565Y10S436/81
Inventor WANG, DANIEL
Owner AGILENT TECH INC
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