Fluorescent Imaging for Cysteine Detection In Vivo with High Selectivity

Area of Science:

• Biochemistry
• Chemical Biology
• Medical Diagnostics

Background:

• Cysteine is an essential amino acid vital for protein and hormone synthesis and maintaining redox balance.
• Abnormal cysteine levels are linked to various severe diseases, necessitating accurate detection methods.
• Existing methods for cysteine detection may lack specificity or in vivo applicability.

Purpose of the Study:

• To design and synthesize a novel fluorescent probe for sensitive and selective detection of cysteine.
• To evaluate the probe's performance in imaging cellular cysteine levels in vitro.
• To assess the probe's utility for in vivo cysteine detection in animal models.

Main Methods:

• Synthesis of a novel fluorescent probe, designated P-Cy.
• In vitro testing of P-Cy's response to cysteine and other biologically relevant thiols (homocysteine, glutathione).
• In vivo imaging of endogenous and exogenous cysteine levels in cells and mice using P-Cy.

Main Results:

• The developed probe P-Cy demonstrated high sensitivity for cysteine detection.
• P-Cy exhibited excellent selectivity, responding only to cysteine and not to other common biothiols like Hcy and GSH.
• Successful imaging of cellular cysteine levels and in situ detection in mice confirmed the probe's efficacy.

Conclusions:

• P-Cy is a sensitive and selective fluorescent probe for detecting cysteine.
• The probe is effective for imaging both cellular and in vivo cysteine concentrations.
• P-Cy represents a powerful tool for studying cysteine-related biological processes and diseases.