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Updated: Feb 20, 2026
An In Vitro Protocol for Evaluating MicroRNA Levels, Functions, and Associated Target Genes in Tumor Cells
Published on: May 21, 2019
miR-92b-3p acts as a tumor suppressor by targeting Gabra3 in pancreatic cancer
Manmei Long1,2, Ming Zhan3, Sunwang Xu3
1Department of Pathology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai, 200127, China.
Background:
MicroRNAs (miRNAs) can act as oncogenes or tumor suppressors by controlling cell proliferation, differentiation, metastasis and apoptosis, and miRNA dysregulation is involved in the development of pancreatic cancer (PC). Our previous study demonstrated that Gabra3 plays critical roles in cancer progression. However, whether Gabra3 is regulated by miRNAs in PC remains unknown.
Methods:
The expression levels of miR-92b-3p and Gabra3 were measured by quantitative PCR (qPCR), immunoblotting, in situ hybridization (ISH) and immunohistochemistry (IHC). The proliferation rate of PC cells was detected by MTS assay. Wound-healing and transwell assays were used to examine the invasive abilities of PC cells. Dual-luciferase reporter assays were used to determine how miR-92b-3p regulates Gabra3. Xenograft mouse models were used to assess the role of miR-92b-3p in PC tumor formation in vivo.
Results:
Here, we provide evidence that miR-92b-3p acted as a tumor suppressor in PC by regulating Gabra3 expression. MiR-92b-3p expression levels were lower in PC tissues than corresponding noncancerous pancreatic (CNP) tissues and were associated with a poor prognosis in PC patients. MiR-92b-3p overexpression suppressed the proliferation and invasion of PC cells in both in vivo and in vitro models. Conversely, miR-92b-3p knockdown induced an aggressive phenotype in PC cells. Mechanistically, miR-92b-3p overexpression suppressed Gabra3 expression, which then led to the inactivation of important oncogenic pathways, including the AKT/mTOR and JNK pathways.
Conclusion:
Our results suggest that miR-92b-3p acted as a tumor suppressor by targeting Gabra3-associated oncogenic pathways; these results provide novel insight into future treatments for PC patients.
Insights
MicroRNA 92b-3p acts as a tumor suppressor in pancreatic cancer by inhibiting Gabra3 expression. Lower miR-92b-3p levels correlate with poor prognosis, and its restoration suppresses tumor growth and invasion.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- MicroRNAs (miRNAs) are crucial regulators of cell processes and are implicated in pancreatic cancer (PC) development.
- Dysregulated miRNA expression is a hallmark of PC, impacting cell proliferation, differentiation, metastasis, and apoptosis.
- Gabra3 has been identified as a key player in cancer progression, but its regulation by miRNAs in PC was previously unknown.
Purpose of the Study:
- To investigate the role of miR-92b-3p in pancreatic cancer.
- To determine if miR-92b-3p regulates Gabra3 expression in PC.
- To elucidate the underlying molecular mechanisms of miR-92b-3p's function in PC progression.
Main Methods:
- Quantitative PCR (qPCR) and immunoblotting for gene and protein expression analysis.
- In situ hybridization (ISH) and immunohistochemistry (IHC) for tissue-based expression profiling.
- Cell proliferation (MTS assay), invasion (wound-healing, Transwell assays), and dual-luciferase reporter assays to assess functional impact and mechanism.
- Xenograft mouse models for in vivo validation of miR-92b-3p's role in tumor formation.
Main Results:
- MiR-92b-3p expression was significantly lower in PC tissues compared to noncancerous pancreatic tissues, correlating with poor patient prognosis.
- Overexpression of miR-92b-3p suppressed PC cell proliferation and invasion in vitro and in vivo.
- Knockdown of miR-92b-3p promoted an aggressive phenotype in PC cells.
- MiR-92b-3p directly targeted Gabra3, leading to the inactivation of oncogenic pathways, including AKT/mTOR and JNK.
Conclusions:
- MiR-92b-3p functions as a tumor suppressor in pancreatic cancer by targeting Gabra3 and associated oncogenic pathways.
- Restoring miR-92b-3p levels offers a potential therapeutic strategy for pancreatic cancer.
- This study provides novel insights into the molecular mechanisms driving pancreatic cancer and identifies a potential therapeutic target.
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