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Erschienen in: Cancer Immunology, Immunotherapy 6/2012

01.06.2012 | Original Article

Calreticulin as a potential diagnostic biomarker for lung cancer

verfasst von: Rongrong Liu, Jiuyu Gong, Jun Chen, Qi Li, Chaojun Song, Jian Zhang, Yongming Li, Zhijia Liu, Yun Dong, Lihua Chen, Boquan Jin

Erschienen in: Cancer Immunology, Immunotherapy | Ausgabe 6/2012

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Abstract

Calreticulin (CRT) is an endoplasmic reticulum luminal Ca2+-binding chaperone protein. By immunizing mice with recombinant fragment (rCRT/39-272), six clones of monoclonal antibodies (mAbs) were generated and characterized. Based on these mAbs, a microplate chemiluminescent enzyme immunoassay (CLEIA) system with a measured limit of detection of 0.09 ng/ml was developed. Using this CLEIA system, it was found that soluble CRT (sCRT) level in serum samples from 58 lung cancer patients was significantly higher than that from 40 healthy individuals (only 9 were detectable, P < 0.0001). Among them, serum sCRT in the small cell lung cancer was lower than that in adenocarcinoma (P = 0.0085), while both were lower than that in the squamous cell carcinoma (P = 0.013, P = 0.0012, respectively). Moreover, it was found that sCRT in sera from the patients after chemotherapy was higher than that from the patients without chemotherapy (P = 0.042). Further study by immunohistochemistry showed that CRT was also highly expressed in the cytoplasm and on the membrane of the lung cancer cells, while there was a trace amount of CRT expression in normal lung cells. Correspondingly, the expression level of CRT on lung cancer cell membrane was associated with the tumor pathological grade. This study demonstrates that sCRT concentration in sera of lung cancer patients is higher than that in sera of healthy individuals, and CRT expression level on lung cancer cell membrane is associated with tumor pathological classification and grade. These findings suggest that CRT may be used as a biomarker in lung cancer prediction and diagnosis.
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Metadaten
Titel
Calreticulin as a potential diagnostic biomarker for lung cancer
verfasst von
Rongrong Liu
Jiuyu Gong
Jun Chen
Qi Li
Chaojun Song
Jian Zhang
Yongming Li
Zhijia Liu
Yun Dong
Lihua Chen
Boquan Jin
Publikationsdatum
01.06.2012
Verlag
Springer-Verlag
Erschienen in
Cancer Immunology, Immunotherapy / Ausgabe 6/2012
Print ISSN: 0340-7004
Elektronische ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-011-1146-8

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