Biologically optimized nanosized molecules and particles: more than just size

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Pharmacokinetics

Background:

• Nanomaterials have expanding biological and medical applications.
• Understanding in vivo particle behavior is critical for nanotechnology development.
• Current research often overemphasizes particle size, neglecting other crucial physical and chemical determinants.

Purpose of the Study:

• To discuss the determinants of in vivo behavior for nanosized molecules.
• To focus on dendrimer-based contrast agents for medical imaging.
• To highlight overlooked factors and gaps in understanding nanoparticle in vivo behavior.

Main Methods:

• Review of existing literature on nanoparticle characteristics and in vivo behavior.
• Analysis of factors beyond hydrodynamic size, including shape and flexibility.
• Focus on synthetic nanosized molecules, particularly dendrimer-based contrast agents.

Main Results:

• Particle size is a primary focus, but shape and flexibility also significantly impact biodistribution and clearance.
• Hydrodynamic size alone is insufficient to predict in vivo nanoparticle behavior.
• Dendrimer-based contrast agents serve as a model for discussing these complex interactions.

Conclusions:

• A comprehensive understanding of nanoparticle physical and chemical properties is essential for optimizing their in vivo applications.
• Factors such as shape and flexibility require further investigation to improve the design of nanomedicines.
• Addressing current knowledge gaps will advance the development of effective nanosized imaging agents.