Abstract
Purpose
The early diagnosis of lymph node metastasis (LNM) in papillary thyroid carcinoma (PTC) is clinically important, as it can aid in treatment decision-making and improve prognosis. In the present study, we aimed to identify whether plasma exosomal miRNAs could be potential diagnostic markers of LNM in PTC.
Methods
Profiles of plasma exosomal miRNAs were screened using miRNA microarrays. Quantitative reverse transcription-polymerase chain reaction (qRT-PCR) was performed in the validation and diagnostic sets to select candidate exosomal miRNAs. Finally, receiver operating characteristic (ROC) curves were generated to evaluate the efficiency of target exosomal miRNAs in distinguishing PTC-N1 patients from PTC-N0 patients.
Results
In total, 197 miRNAs were found to be differentially expressed in the testing set. Based on the qRT-PCR results, the expression of miR-6774-3p (p < 0.001) and miR-6879-5p (p < 0.001) in the PTC-N1 patients was significantly higher than that in the controls. The AUC values of plasma exosomal miR-6774-3p (0.802; 95% CI, 0.724–0.879) and miR-6879-5p (0.787; 95% CI, 0.706–0.867) and their combination (0.914; 95% CI, 0.865–0.962) were higher than those of the total miRNAs directly isolated from plasma. Moreover, the expression of exosomal miRNAs was stable after treatment with RNase A, prolonged incubation, or repeated freezing and thawing.
Conclusions
The two plasma exosomal miRNAs (miR-6774-3p and miR-6879-5p) and their combination could serve as new promising biomarkers for the diagnosis of LNM in PTC patients.
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Data availability
The datasets generated in this study are available upon request from the corresponding author.
Abbreviations
- PTC:
-
papillary thyroid carcinoma;
- LNM:
-
lymph node metastasis;
- HT:
-
Hashimoto’s thyroiditis;
- miRNAs:
-
microRNAs;
- UTR:
-
untranslated region;
- qRT-PCR:
-
quantitative real-time polymerase chain reaction;
- FNA:
-
fine needle aspiration;
- NTA:
-
nanoparticle tracking analysis;
- TEM:
-
transmission electron microscope;
- AGCC:
-
Affymetrix GeneChip Command Console;
- GO:
-
Gene Ontology;
- KEGG:
-
Kyoto Encyclopedia of Genes and Genomes;
- ROC:
-
receiver operating characteristic;
- AUC:
-
area under the curve;
- CI:
-
confidence interval.
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Acknowledgements
We thank the patients for participating in this study. We thank Echo Biotech Co., Ltd, Beijing, China for its technical support in the identification of exosomes (NTA, TEM and western blot analysis).
Author contributors
W.J.C.: study concept and design, experimental studies, data analysis, and drafting of the manuscript; G.P.L.: study concept and design, experimental studies, and statistical analysis; Z.H.L.: administrative or technical support and study supervision; J.Q.Z.: administrative or technical support and study supervision; T.W.: administrative or technical support and study supervision; J.Y.L.: study concept and design, critical revision of the manuscript, and study supervision. All authors read and approved the final manuscript.
Funding
This study was supported by grants from the National Natural Science Foundation (82173245), Sichuan Science and Technology Program (2020YFS0208), the 1•3•5 Project for Disciplines of Excellence-Clinical Research Incubation Project, West China Hospital, Sichuan University (2021HXFH005), the Science and Technology Achievement Transformation Project, West China Hospital, Sichuan University (CGZH21004), and Sichuan Science and Technology Program (2020YJ0237).
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Chen, W., Li, G., Li, Z. et al. Evaluation of plasma exosomal miRNAs as potential diagnostic biomarkers of lymph node metastasis in papillary thyroid carcinoma. Endocrine 75, 846–855 (2022). https://doi.org/10.1007/s12020-021-02949-x
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DOI: https://doi.org/10.1007/s12020-021-02949-x