Environment-sensitive fluorescent inhibitors of histone deacetylase

Area of Science:

• Biochemistry
• Molecular Biology
• Chemical Biology

Background:

• Histone deacetylases (HDACs) are enzymes implicated in gene regulation and are therapeutic targets for diseases, especially cancers.
• Aberrant expression or mutations in HDACs are linked to various human pathologies, underscoring their clinical significance.
• A limited number of small molecule fluorescent probes exist for studying HDAC activity.

Purpose of the Study:

• To design and synthesize novel environment-sensitive fluorescent inhibitors for studying histone deacetylase (HDAC) activity.
• To develop a switch-based mechanism for these fluorescent probes to enable activity-dependent imaging.
• To explore the potential of these probes for diagnosing and treating HDAC-related diseases.

Main Methods:

• Design and synthesis of a series of environment-sensitive fluorescent inhibitors targeting HDACs.
• Evaluation of enzyme inhibition activity of synthesized compounds in vitro, using SAHA as a positive control.
• Assessment of cellular and tissue imaging capabilities of the lead compound in living cells and tumor-tissue slices.

Main Results:

• Compound 6b demonstrated enzyme inhibition activity comparable to the positive control drug SAHA.
• The synthesized fluorescent inhibitor exhibited suitable imaging performance in both living cells and tumor-tissue slices.
• The environment-sensitive nature and switch mechanism of the probes were validated.

Conclusions:

• The developed environment-sensitive fluorescent inhibitors offer a new approach for studying HDAC activity.
• Compound 6b shows potential as a tool for the diagnosis and treatment of cancers and other HDAC-related diseases.
• This work provides a novel strategy for the development of fluorescent probes for enzyme activity monitoring.