[Double-antigen sandwich ELISA for detecting Aspergillus fumigatus anti-Afmp1cr and Afmp2cr antibodies].
OBJECTIVE
To establish two double-antigen sandwich ELISA systems to detect anti-Afmp1cr and Afmp2cr antibodies of Aspergillus fumigatus.


METHODS
Recombinant Afmp1cr and Afmp2cr proteins of A.fumigatus expressed in Pichia pastoris were obtained. Double-antigen sandwich ELISA systems for detecting specific anti-Afmp1cr and anti-Afmp2cr antibodies were developed after chessboard titrating to determine the appropriate concentrations of the recombinant proteins and HRP-labeled proteins. The sensitivity of the assay was evaluated using serum samples of rabbits immunized with Afmp1cr and Afmp2cr. The specificity of the assay was evaluated by detecting serum samples from healthy donors and patients with other pathogenic fungal and baterial infections. The performance of the two ELISA kits was furthered evaluated using serum samples from patients with suspected Aspergillus infection.


RESULTS
The established ELISA kits were capable of detecting anti-Afmp1cr and anti-Afmp2cr antibodies in immunized rabbit serum at the maximum dilutions of 800 and 3200, respectively. No cross-reactivity was observed in detecting serum from patients with other pathogenic fungal or bactetial infections. Both of the two kits yielded positive results in sera from two established Aspergillus-infected cases and a suspected case.


CONCLUSIONS
Two antibody-capture ELISA kits were developed for the laboratory diagnosis of A.fumigatus infection and can be potentially useful in the clinical diagnosis of Aspergillosis infections.
Zhujiang Hospital, Southern Medical University, Guangzhou 510282, China. E-mail: yangmei8433@163.com.
Mei
M
Yang
Zhuoya
Z
Wang
Wei
W
Hao
Yanfang
Y
Wang
Li
L
Huang
Jianpiao
J
Cai
Lingxiao
L
Jiang
Xiaoyan
X
Che
Xiaozhu
X
Zhong
Nan
N
Yu
D000818:Animals; D000908:Antibodies, Fungal / Q000302:isolation & purification*; D000946:Antigens, Fungal; D001228:Aspergillosis / Q000175:diagnosis; D001232:Aspergillus fumigatus; D003429:Cross Reactions; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D010843:Pichia; D011817:Rabbits; D011994:Recombinant Proteins; D012680:Sensitivity and Specificity
D000908:Antibodies, Fungal; D000946:Antigens, Fungal; D011994:Recombinant Proteins