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Updated: Jun 28, 2026

In Vivo Inhibition of MicroRNA to Decrease Tumor Growth in Mice
Published on: August 23, 2019
Reduced expression of N-Myc downstream-regulated gene 2 in human thyroid cancer
Huadong Zhao1, Jian Zhang, Jianguo Lu
1Department of General Surgery, Tangdu Hospital, The Fourth Military Medical University, Xi'an, 710038, PR China. zhaolujy@fmmu.edu.cn
Background:
NDRG2 (N-Myc downstream-regulated gene 2) was initially cloned in our laboratory. Previous results have shown that NDRG2 expressed differentially in normal and cancer tissues. Specifically, NDRG2 mRNA was down-regulated or undetectable in several human cancers, and over-expression of NDRG2 inhibited the proliferation of cancer cells. NDRG2 also exerts important functions in cell differentiation and tumor suppression. However, it remains unclear whether NDRG2 participates in carcinogenesis of the thyroid.
Methods:
In this study, we investigated the expression profile of human NDRG2 in thyroid adenomas and carcinomas, by examining tissues from individuals with thyroid adenomas (n = 40) and carcinomas (n = 35), along with corresponding normal tissues. Immunohistochemistry, quantitative RT-PCR and western blot methods were utilized to determine both the protein and mRNA expression status of Ndrg2 and c-Myc.
Results:
The immunostaining analysis revealed a decrease of Ndrg2 expression in thyroid carcinomas. When comparing adenomas or carcinomas with adjacent normal tissue from the same individual, the mRNA expression level of NDRG2 was significantly decreased in thyroid carcinoma tissues, while there was little difference in adenoma tissues. This differential expression was confirmed at the protein level by western blotting. However, there were no significant correlations of NDRG2 expression with gender, age, different histotypes of thyroid cancers or distant metastases.
Conclusion:
Our data indicates that NDRG2 may participate in thyroid carcinogenesis. This finding provides novel insight into the important role of NDRG2 in the development of thyroid carcinomas. Future studies are needed to address whether the down-regulation of NDRG2 is a cause or a consequence of the progression from a normal thyroid to a carcinoma.
Insights
N-Myc downstream-regulated gene 2 (NDRG2) is downregulated in thyroid carcinomas, suggesting its role in thyroid cancer development. Further research is needed to confirm if NDRG2 loss causes or results from cancer progression.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- N-Myc downstream-regulated gene 2 (NDRG2) is implicated in tumor suppression and differentiation.
- NDRG2 expression is altered in various human cancers.
- Its role in thyroid carcinogenesis remains largely unexplored.
Purpose of the Study:
- To investigate the expression profile of NDRG2 in thyroid adenomas and carcinomas.
- To determine the correlation between NDRG2 expression and clinicopathological features of thyroid cancer.
Main Methods:
- Examined NDRG2 protein and mRNA levels in 40 thyroid adenomas, 35 thyroid carcinomas, and adjacent normal tissues.
- Utilized immunohistochemistry, quantitative RT-PCR, and western blotting.
- Assessed c-Myc expression alongside NDRG2.
Main Results:
- NDRG2 protein and mRNA expression were significantly decreased in thyroid carcinomas compared to normal tissues.
- NDRG2 expression showed minimal difference in adenomas versus normal tissues.
- No significant correlation was found between NDRG2 levels and gender, age, histotype, or metastasis.
Conclusions:
- NDRG2 downregulation may play a role in thyroid carcinogenesis.
- This study highlights NDRG2's potential involvement in thyroid cancer development.
- Further investigation is required to establish causality between NDRG2 downregulation and thyroid cancer progression.
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