title: N-acetylated α-linked acidic dipeptidase is identified as an antigen of Histoplasma capsulatum.
abstract: Histoplasmosis, one of the most important mycoses, needs to be diagnosed rapidly and accurately. The main method used to diagnose histoplasmosis is serological detection of antibodies to the Histoplasma capsulatum H and M antigens. Several other protein antigens have been reported in H. capsulatum; however, they have not been used for diagnosis. In this study, we explored novel antigens that were detected during H. capsulatum infection. We obtained a protein mixture from H. capsulatum yeast cells after vigorous mixing in a 0.1% Triton X-100 solution. From the resultant pool, we detected nine spots that reacted with sera from patients with histoplasmosis and identified eight seroactive proteins with mass spectrometry. The seroactive proteins were purified, and their antigenicities were tested with an enzyme-linked immunosorbent assay (ELISA). ELISA revealed that the titer of the patients' sera to N-acetylated α-linked acidic dipeptidase was significantly higher than those of healthy volunteers (P < 0.01). These data indicate that N-acetylated α-linked acidic dipeptidase of H. capsulatum is recognized as a major antigen during histoplasmosis.
authors: Research Unit for Risk Analysis, Diagnostic Center for Animal Health and Food Safety, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2-11, Inadacho, Obihiro, Hokkaido 080-8555, Japan; Division of Clinical Research, Medical Mycology Research Center, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba City, Chiba 260-8673, Japan. Electronic address: tome@obihiro.ac.jp.
authors: Takahito
authors: T
authors: Toyotome
authors: Division of Clinical Research, Medical Mycology Research Center, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba City, Chiba 260-8673, Japan; Division of Control and Treatment of Infectious Diseases, Chiba University Hospital, 1-8-1 Inohana, Chuo-ku, Chiba City, Chiba 260-8673, Japan.
authors: Akira
authors: A
authors: Watanabe
authors: Division of Clinical Research, Medical Mycology Research Center, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba City, Chiba 260-8673, Japan.
authors: Eri
authors: E
authors: Ochiai
authors: Division of Clinical Research, Medical Mycology Research Center, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba City, Chiba 260-8673, Japan; Division of Control and Treatment of Infectious Diseases, Chiba University Hospital, 1-8-1 Inohana, Chuo-ku, Chiba City, Chiba 260-8673, Japan.
authors: Katsuhiko
authors: K
authors: Kamei
mesh_terms: D000107:Acetylation; D000946:Antigens, Fungal / Q000097:blood / Q000276:immunology* / Q000302:isolation & purification; D004150:Dipeptidases / Q000097:blood / Q000276:immunology* / Q000302:isolation & purification; D004797:Enzyme-Linked Immunosorbent Assay; D006658:Histoplasma / Q000201:enzymology* / Q000276:immunology*; D006660:Histoplasmosis / Q000097:blood / Q000276:immunology* / Q000382:microbiology; D006801:Humans
chemical_list: D000946:Antigens, Fungal; D004150:Dipeptidases; C038937:dipeptidase
keywords: Histoplasma capsulatum; Histoplasmosis; N-acetylated α-linked acidic dipeptidase