Nuclear mTOR Signaling Orchestrates Transcriptional Programs Underlying Cellular Growth and Metabolism

Area of Science:

• Cell Biology
• Molecular Biology
• Cancer Research

Background:

• The mechanistic target of rapamycin (mTOR) is a key regulator of cell growth and metabolism, responding to nutrient and mitogenic signals.
• mTOR is localized not only in the cytoplasm but also within the nucleus, suggesting diverse cellular functions.

Purpose of the Study:

• To review the direct involvement of nuclear mTOR in gene expression and epigenetic regulation.
• To highlight the role of nuclear mTOR in integrating metabolic and epigenetic signaling pathways.
• To emphasize the significance of nuclear mTOR in cellular homeostasis, cancer development, and progression.

Main Methods:

• Literature review of studies investigating nuclear mTOR functions.
• Analysis of research on mTOR's interaction with transcription factors, epigenetic modifiers, and chromatin remodeling complexes.
• Synthesis of findings on the interplay between metabolism, epigenetics, and nuclear mTOR signaling.

Main Results:

• Nuclear mTOR directly regulates transcription factors, epigenetic modifications, and chromatin remodeling.
• These nuclear functions modulate gene expression programs critical for cellular growth and metabolism.
• Nuclear mTOR integrates nutrient signaling with epigenetic control of gene expression.

Conclusions:

• Nuclear mTOR acts as a central hub governing cellular homeostasis and metabolic processes.
• Dysregulation of nuclear mTOR signaling is implicated in malignant transformation and cancer progression.
• Understanding nuclear mTOR pathways may unveil novel therapeutic strategies for cancer and metabolic diseases.