An inexpensive point-of-care immunochromatographic test for Talaromyces marneffei infection based on the yeast phase specific monoclonal antibody 4D1 and Galanthus nivalis agglutinin

Autor: Skorn Mongkolsuk, Akarin Intaramat, Sirida Youngchim, Anna Kaltsas, Kritsada Pruksaphon, Kavi Ratanabanangkoon, Pavinee Simsiriwong, Joshua D. Nosanchuk
Jazyk: angličtina
Rok vydání: 2021
Předmět:
0301 basic medicine
Physiology
RC955-962
Mannose
Metal Nanoparticles
Urine
Gold Colloid
Pathology and Laboratory Medicine
chemistry.chemical_compound
0302 clinical medicine
Antigen Encapsulation
Nitrocellulose
Limit of Detection
Arctic medicine. Tropical medicine
Medicine and Health Sciences
030212 general & internal medicine
Drug Delivery System Preparation
Enzyme-Linked Immunoassays
Fungal Pathogens
Immunoassay
medicine.diagnostic_test
Pharmaceutics
Eukaryota
Antibodies
Monoclonal
Neglected Diseases
Esters
Fungal antigen
Body Fluids
Chemistry
Infectious Diseases
Medical Microbiology
Point-of-Care Testing
Physical Sciences
Antigens
Surface
Anatomy
Pathogens
Plant Lectins
Public aspects of medicine
RA1-1270
Research Article
Antigens
Fungal
medicine.drug_class
030106 microbiology
Enzyme-Linked Immunosorbent Assay
Mycology
Biology
Monoclonal antibody
Research and Analysis Methods
Microbiology
Mannose-Binding Lectin
03 medical and health sciences
Antigen
Diagnostic Medicine
parasitic diseases
medicine
Humans
Immunoassays
Microbial Pathogens
Pharmaceutical Processing Technology
Public Health
Environmental and Occupational Health
Chemical Compounds
Organisms
Fungi
Biology and Life Sciences
Yeast
Mannose-Binding Lectins
chemistry
Mycoses
Talaromyces
Thermally dimorphic fungus
Immunologic Techniques
Zdroj: PLoS Neglected Tropical Diseases, Vol 15, Iss 5, p e0009058 (2021)
PLoS Neglected Tropical Diseases
ISSN: 1935-2735
1935-2727
Popis: Talaromyces marneffei is a thermally dimorphic fungus that causes opportunistic systemic mycoses in patients with AIDS or other immunodeficiency syndromes. The purpose of this study was to develop an immunochromatographic strip test (ICT) based on a solid phase sandwich format immunoassay for the detection of T. marneffei antigens in clinical urine specimens. The T. marneffei yeast phase specific monoclonal antibody 4D1 (MAb4D1) conjugated with colloidal gold nanoparticle was used as a specific signal reporter. Galanthus nivalis Agglutinin (GNA) was adsorbed onto nitrocellulose membrane to serve as the test line. Similarly, a control line was created above the test line by immobilization of rabbit anti-mouse IgG. The immobilized GNA served as capturing molecule and as non-immune mediated anti-terminal mannose of T. marneffei antigenic mannoprotein. The MAb4D1–GNA based ICT showed specific binding activity with yeast phase antigen of T. marneffei, and it did not react with other common pathogenic fungal antigens. The limit of detection of this ICT for T. marneffei antigen spiked in normal urine was approximately 0.6 μg/ml. The diagnostic performance of the ICT was validated using 341 urine samples from patents with culture- confirmed T. marneffei infection and from a control group of healthy individuals and patients with other infections in an endemic area. The ICT exhibited 89.47% sensitivity, 100% specificity, and 97.65% accuracy. Our results demonstrate that the urine-based GNA–MAb4D1 based ICT produces a visual result within 30 minutes and that the test is highly specific for the diagnosis of T. marneffei infection. The findings validate the deployment of the ICT for clinical use.
Author summary Talaromycosis (Penicilliosis marneffei) is a neglected disease that causes an opportunistic systemic mycoses in AIDS and other immune-deficient patients living in Southeast Asia, China and the Indian subcontinent. Although laboratory culture remains a gold standard diagnostic method, it lacks sensitivity and is time-consuming, which results in delayed patient’s treatment and needed care. In this study, we develop an immunochromatographic strip test (ICT) by utilizing a yeast phase specific monoclonal antibody 4D1 and Galanthus nivalis agglutinin for detection of T. marneffei antigens in clinical urine specimens. Our data showed that the assay exhibited high sensitivity (89.47%) and specificity (100%), with its result available within 30 minutes. In addition, this diagnostic assay is inexpensive, reproducible, and simple to perform. Therefore, the T. marneffei ICT should be considered for clinical application in the context of rapid and affordable point-of-care diagnostic test to reduce the burden of talaromycosis mortality in patients in low resource countries.
Databáze: OpenAIRE
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