Prevalence of serum galectin‑1 autoantibodies in seven types of cancer: A potential biomarker
- Authors:
- Published online on: July 1, 2021 https://doi.org/10.3892/mco.2021.2341
- Article Number: 179
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Copyright: © Nanami et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
Abstract
Introduction
Galectin-1, an endogenous lectin found at immune-privileged sites, has a critical role in the regulation of the immune response in the tumor microenvironment (1). Wide varieties of biological phenomena are related to galectins, i.e., development, differentiation, morphogenesis, tumor metastasis, apoptosis, RNA splicing, and immunoregulatory function (2,3). In different cancer types, galectin-1 is abundantly expressed (4,5) and is noted as one of the key players in tumor-mediated immune escape (6). Intra-tumoral high galectin-1 protein expression can be a poor prognostic biomarker in cancers given its immuno-suppressive function (7).
Although galectin-1 protein in cancer tissues is an immune-escape biomarker, its analysis in the serum may be preferable in clinical practice (8,9). Serum galectin-1 levels has been reported to associated with tumor progression and poor prognosis in various types of cancer (10-12). While, serum autoantibodies against various tumor antigens were reported to be useful biomarkers for early detection and for predicting cancer biology (13,14) rather than serum tumor antigen. The prevalence of such autoantibodies (15) should be a fundamental data in designing clinical trials targeting tumor antigens. Previously, we reported that serum galectin-1 autoantibody (s-Gal-1-Abs) is a useful biomarker in hepatocellular carcinoma (16) which might be associated with galectin-1 protein expression. However, there was no data to compare positive rates of s-Gal-1-Abs in various cancer types.
Therefore, in the present study, 1,833 patients with seven different cancer types were evaluated for the presence of s-GAL-1-Abs using the ELISA system. Such fundamental information of s-GAL-1-Abs in a wide range of tumor types may be useful for further clinical studies of immune-therapy or immune-diagnosis.
Materials and methods
Collection of sera
Before the onset of treatment, sera were obtained from 1,833 patients at Chiba Cancer Center with different cancer types involving the esophagus (n=172), stomach (n=317), large intestine (n=262), liver (n=91), prostate (n=358), breast (n=364), lung (n=269), and 72 healthy donors. Age and stages were shown in Table I. Each serum sample was centrifuged at 3,000 x g for 5 min, and the resulting supernatant was stored at -80˚C until analyzed at Toho University. We avoided repeated thawing and freezing of the samples. This study was approved by the institutional ethics committee of the Chiba Cancer Center (#21-26) and the Toho University School of Medicine (#22-112, #22-047). Additionally, written informed consent was obtained from all patients. Patient recruitment was conducted from July 2008 to March 2010.
Enzyme-linked immunosorbent assay to detect s-Gal-1-Abs and other conventional tumor markers
Serum samples were analyzed using an enzyme-linked immunosorbent assay, as previously described (16). Purified recombinant GAL-1 protein was coated onto 96-well microtiter plates (Maxisorp; Nunc). The absorbance was measured at 450 nm using a SUNRISE Microplate Reader (Tecan Japan Co., Ltd.). Gal-1 signals were evaluated by calculating the difference in absorbance between the wells containing galectin-1 and phosphate-buffered saline. Since the antibody titers are displayed in numerical value of absorbance, there is no unit of the protein amount.
Statistical analyses
Fisher's exact (two-sided) probability test was used to determine the differences between the two groups. All statistical analyses were performed using EZR (Saitama Medical Centre, Jichi Medical University; Saitama, Japan) (17), which is a graphical user interface for R (The R Foundation for Statistical Computing; version 2.13.0). A P-value <0.05 was considered to indicate a statistically significant difference.
Results and Discussion
In the present study, 1,833 patients with different cancer types were evaluated for the presence of s-GAL-1-Abs. Patients with HCC and Lung cancer demonstrated significantly higher positive rates for s-GAL-1-Abs.
Serum titers of anti-galectin-1 antibodies
s-GAL-1-Abs levels were divided into two groups; normal optical density (OD) values that were below the border level of 0.368 (calculated as the mean (0.053) + 3 standard deviations (0.105) of the values in healthy donors) and abnormal, or positive, values that were higher than 0.368 (Fig. 1). Mean OD values for each cancer type were as follows: 0.362 in HCC, 0.213 in lung cancer, 0.227 in esophageal cancer, 0.208 in colorectal cancer, 0.141 in prostate cancer, 0.136 in gastric cancer, and 0.179 in breast cancer.
Positive rates of serum anti-galectin-1 antibodies in various types of tumors
The positive rate of serum anti-GAL-1 antibodies were greater than 10% in patients with HCC (16.7%), lung cancer (13.8%), esophageal squamous cell carcinoma (11.6%), and colorectal cancer (11.5%) (Fig. 2). Other cancer types demonstrated similar positive rates of around 6 to 7%. Although the overall positive rate of s-GAL-1-Abs was not higher than that of conventional tumor markers (13,18-21), it was found to be positive in various cancer types.
The differences of the positive rates of s-GAL-1-Abs among various cancer types might be associated with the positive rates of galectin-1 protein expression in the tumor tissues. Actually, the positive rates of galectin-1 protein expression were 57% in HCC (22), 51.5% in lung cancer (23), 30% in colorectal cancer (24), and 60.6% in gastric cancer (25). There were no reports on esophageal cancer, prostate cancer, and breast cancer. Although the information of protein expression was limited, there were no association with the positive rate of serum autoantibody.
Unlike conventional secretory tumor markers, autoantibody markers have been reported to be positive even in early stage cancer. However, the positive rates of advanced stages were not always higher than the positive rates of early stages. The exact reason why such paradoxical positive rates was unknow but potential immunosuppression in advanced stages might affect antibody reaction (26-28).
Comparison of positive rates of serum anti-galectin-1 antibodies according to tumor stages
For the comparison of s-GLA-Abs according to the stages, each tumor was divided into Stage 0/I/II and III/VI (Fig. 3). HCC, colorectal cancer, and breast cancer showed higher positive rates in stage 0/I/II than in stage III/IV. Lung cancer, esophageal cancer, prostate cancer, and gastric cancer showed higher positive rates in stage III/IV than in stage 0/I/II.
Recent reports showed that galectin-1 targeting therapy may have a potential role to modify anti-cancer immune response (6,29). Galectin-1 vaccination or knockdown therapy could be one of the options for s-GAL-1-Abs positive cancer patients.
Figs. 2 and 3 showed just percentage of positive rates in each cancer types. These percentages were calculated by dividing the positive cases by all cases in Fig. 2. In Fig. 3, the percentages were calculated by dividing the positive cases by total cases at each stage.
In summary, the present study, of the 1,833 patients with seven different cancer types, showed that HCC and lung cancer patients showed relatively higher positive rates of s-GAL-1-Abs than the other cancer types. Based on its low sensitivity, the s-GAL-1-Abs may not be the first choice of a serum marker in other cancers. Such fundamental information of s-GAL-1-Abs in a wide range of tumor types could be a little help for further clinical studies of immune-therapy or immune-diagnosis.
Limitations
Our present study did not include any survival data. Further studies are required in prospective manner to evaluate the prognostic significance and effects on treatment response of serum Galectin-1autoantibodies.
Acknowledgements
The authors would like to acknowledge Ms. Seiko Ohtsuka (Research Secretary of Toho University Hospital) for sampling and preparing the database for this study.
Funding
The current study was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan (grant nos. 24591961 and 21591717).
Availability of data and materials
The datasets used and/or analyzed in the present study are available from the corresponding author on reasonable request.
Authors' contributions
TN, IH, MI and HS conceived and designed the current study. SY, YO, TS, and FS analyzed the data. AK developed the ELISA system. TN, TH and HS analyzed patient data and drafted the manuscript. HS and TN confirm the authenticity of all the raw data. All authors have read and approved the final manuscript.
Ethics approval and consent to participate
The current study was approved by the institutional Ethics Committees of the Chiba Cancer Center (approval no. #21-26) and the Toho University School of Medicine (approval nos. #22-112 and #22-047). Additionally, written informed consent was obtained from all patients.
Patient consent for publication
Not applicable.
Competing interests
HS received a research grant from Medical & Biological Laboratories Co., Ltd.. The other authors declare that they have no competing interests.
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