Ubiquitin-specific Protease-7 Inhibition Impairs Tip60-dependent Foxp3+ T-regulatory Cell Function and Promotes...

Area of Science:

• Immunology
• Oncology
• Molecular Biology

Background:

• Foxp3+ T-regulatory (Treg) cells suppress anti-tumor immunity.
• Current Treg therapies have limitations, focusing on transient depletion or secondary modulation.
• Tip60, a histone acetyltransferase, is critical for Treg cell function.

Purpose of the Study:

• Investigate the role of ubiquitin-specific protease 7 (Usp7) in Treg cell function.
• Determine if targeting Usp7 can impair Treg suppressive activity and enhance anti-tumor responses.

Main Methods:

• Studied post-translational modifications regulating Foxp3.
• Utilized genetic and pharmacologic targeting of Usp7 in mouse models.
• Assessed Treg cell function, tumor growth, and efficacy of immunotherapy (anti-PD1).

Main Results:

• Usp7 stabilizes and promotes multimerization of Tip60 and Foxp3, thereby controlling Treg function.
• Genetic or pharmacologic inhibition of Usp7 impairs Treg suppressive functions without affecting conventional T cells.
• Usp7 inhibitors reduced tumor growth and enhanced the efficacy of antitumor vaccines and anti-PD1 therapy in mice.

Conclusions:

• Usp7 is a key regulator of Foxp3+ Treg cell stability and function.
• Pharmacologic targeting of Usp7 represents a promising strategy for cancer immunotherapy.
• Usp7 inhibitors may improve outcomes for patients undergoing cancer treatment.