A BODIPY-based two-photon fluorescent probe validates tyrosinase activity in live cells

Area of Science:

• Biochemistry
• Cell Biology
• Chemical Biology

Background:

• Tyrosinase is a key enzyme in melanin synthesis.
• Accurate tracking of tyrosinase activity is crucial for understanding cellular processes and diseases.
• Existing methods for detecting tyrosinase activity often suffer from interference and lack specificity.

Purpose of the Study:

• To design, synthesize, and apply a novel two-photon fluorescent probe (Tyro-1) for selective and sensitive detection of intracellular tyrosinase activity.
• To investigate the probe's performance in terms of fluorescence enhancement, selectivity, and cellular imaging capabilities.
• To explore the utility of Tyro-1 for monitoring hydrogen peroxide-mediated upregulation of tyrosinase.

Main Methods:

• Rational design and synthesis of the two-photon fluorescent probe Tyro-1.
• In vitro characterization of the probe's fluorescence response to tyrosinase.
• Chemoselectivity assessment against interfering oxidizing agents.
• Cellular imaging experiments using two-photon microscopy to track intracellular tyrosinase activity.
• Evaluation of probe's cytotoxicity.

Main Results:

• Tyro-1 demonstrated a 12.5-fold fluorescence enhancement at 450 nm upon encountering tyrosinase.
• The probe exhibited chemoselectivity, avoiding interference from other cellular oxidizing entities.
• Tyro-1 proved to be non-toxic, allowing for live-cell imaging.
• The probe successfully visualized H2O2-mediated upregulation of tyrosinase in cells.

Conclusions:

• Tyro-1 is a highly effective two-photon fluorescent probe for the chemoselective detection of intracellular tyrosinase activity.
• The probe's non-invasive imaging capability facilitates the validation of tyrosinase expression in live cells.
• Tyro-1 offers a valuable tool for studying tyrosinase-related biological processes and disease mechanisms.