Nutritional Sensor REDD1 in Cancer and Inflammation: Friend or Foe?

Area of Science:

• Molecular Biology
• Cellular Stress Response
• Cancer Biology

Background:

• Regulated in Development and DNA Damage Response 1 (REDD1), also known as DNA Damage-Induced Transcript 4 (DDIT4), is an immediate early gene.
• REDD1 is activated by various stressors, including growth factor deprivation, hypoxia, DNA damage, and glucocorticoids.
• REDD1's primary functions involve inhibiting proliferative signaling and regulating metabolism by suppressing mTOR.

Purpose of the Study:

• To review the role of REDD1 in cellular signaling and processes in normal and cancer cells.
• To discuss REDD1's involvement in the pathogenesis of diseases, particularly cancer and inflammatory conditions.
• To explore strategies for safer glucocorticoid receptor (GR)-targeted therapies by combining glucocorticoids with REDD1 inhibitors.

Main Methods:

• Literature review of REDD1's function and involvement in disease.
• Analysis of REDD1's role in stress response pathways.
• Examination of REDD1's interaction with glucocorticoid signaling.

Main Results:

• REDD1 plays a critical role in mediating cellular responses to stress and regulating cell growth, apoptosis, metabolism, and oxidative stress.
• REDD1 is implicated in the pathogenesis of various diseases, including cancer and inflammatory conditions.
• REDD1 is identified as a key mediator of the adverse atrophic effects associated with chronic glucocorticoid use.

Conclusions:

• REDD1 is a significant regulator of cellular processes and disease pathogenesis.
• Targeting REDD1 offers a potential strategy to mitigate the side effects of glucocorticoid therapies.
• Combining glucocorticoids with REDD1 inhibitors could lead to safer and more effective treatments for cancer and inflammatory diseases.