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TSC complex decrease the expression of mTOR by regulated miR-199b-3p.

Na Zhao1,2, Qiuhong Xiong1, Ping Li1

  • 1Key Laboratory of Chemical Biology and Molecular Engineering of National Ministry of Education, Institutes of Biomedical Sciences, Shanxi University, Taiyuan, 030006, China.

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|January 13, 2025
PubMed
Summary
This summary is machine-generated.

Genetic variations in TSC1 or TSC2 disrupt the TSC complex, leading to tuberous sclerosis complex (TSC) disease. This study identifies miR-199b-3p as a novel regulator of mTOR signaling in TSC.

Keywords:
MTORMiR-199b-3pTSCTSC1TSC2

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cellular Signaling

Background:

  • The tuberous sclerosis complex (TSC) is a rare genetic disorder caused by mutations in TSC1 or TSC2 genes.
  • The TSC complex (TSC1/TSC2) is a critical negative regulator of the mechanistic target of rapamycin complex 1 (mTORC1).
  • Dysregulation of mTOR signaling is implicated in various diseases, including TSC.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying TSC caused by novel genetic variations in TSC1 and TSC2.
  • To explore the role of microRNA-199b-3p (miR-199b-3p) in TSC pathogenesis and mTOR signaling.
  • To identify potential therapeutic targets for TSC.

Main Methods:

  • Genetic analysis of patients with TSC to identify variations in TSC1 and TSC2.
  • Cellular assays to assess the impact of identified mutations on TSC complex formation and stability.
  • Quantitative real-time PCR (qRT-PCR) to measure miR-199b-3p expression levels.
  • Western blotting to evaluate the expression and activation of mTOR, mTORC1, and mTORC2.

Main Results:

  • Identified a novel de novo TSC2 variation (c.1113delG, p.Q371fs) alongside a reported TSC1 variation (c.2509_2512del, p.N837fs).
  • Observed decreased TSC complex formation correlating with reduced miR-199b-3p expression in affected cells.
  • Demonstrated that reduced miR-199b-3p expression leads to increased mTOR expression and activation of mTORC1 and mTORC2.
  • Showed that supplementing miR-199b-3p reverses the increased mTOR expression and mTORC1/mTORC2 activation.

Conclusions:

  • Genetic variations in TSC1 or TSC2 disrupt TSC complex formation, contributing to TSC disease.
  • miR-199b-3p plays a crucial role in regulating mTOR signaling pathways.
  • miR-199b-3p represents a potential therapeutic target for managing TSC and related disorders.