Continuing progress toward controlled intracellular delivery of semiconductor quantum dots.

Area of Science:

• Biotechnology
• Nanotechnology
• Cellular Biology

Background:

• Luminescent semiconductor quantum dots (QDs) possess unique photophysical and physicochemical properties.
• These properties enable diverse biological applications, including cellular labeling, nanoscale sensor development, and nanoparticle-mediated drug delivery research.

Purpose of the Study:

• To review the latest advancements in delivering quantum dots (QDs) to cells for biological applications.
• To discuss methods for overcoming challenges like endosomal sequestration and to examine QD cytotoxicity.

Main Methods:

• Exploration of passive, facilitated (peptide/polymer-based), and active (electroporation) QD delivery strategies.
• Analysis of combined delivery mechanisms and recent methods for achieving endosomal escape.
• Discussion of material preparation, bioconjugation, and cytotoxicity considerations.

Main Results:

• Various QD delivery methods, including passive, facilitated, and active approaches, have been developed.
• Emerging strategies focus on combined mechanisms and achieving endosomal escape for enhanced cytosolic delivery.
• The field is actively addressing QD cytotoxicity and optimizing delivery for biological applications.

Conclusions:

• Controlled cellular delivery of QDs is crucial for advancing their biological applications.
• Continued research into novel delivery systems and endosomal escape mechanisms will enhance QD utility.
• Addressing cytotoxicity concerns is essential for the future development and widespread use of QDs in biology.