In-Vivo fluorescent nanosensor implants based on hydrogel-encapsulation: investigating the inflammation and the...

Area of Science:

• Biomaterials Science
• Nanotechnology
• Immunology

Background:

• Nanosensors offer advanced in-vivo applications in life sciences, including biosensing and bioimaging.
• Synthetic biomaterials, including nanosensors, can elicit variable tissue responses impacting organism health and material longevity.
• Hydrogel encapsulation may mitigate adverse tissue reactions to nanomaterials.

Purpose of the Study:

• To determine optimal hydrogel encapsulation strategies for minimizing inflammatory responses to implanted nanosensors.
• To establish design rules for poly (ethylene glycol) diacrylate (PEGDA) hydrogels for improved in-vivo biocompatibility.
• To correlate tissue response with the functional lifetime of nanosensors.

Main Methods:

• Implantation of five PEGDA hydrogel formulations containing fluorescent nanosensors into SKH-1E mice.
• Tracking inflammatory responses and characterizing hydrogel degradation products.
• Comparative analysis of immune responses in five different immunocompromised mouse lines.
• Measurement of time-dependent nanosensor deactivation post-implantation.

Main Results:

• Higher crosslinking density in PEGDA hydrogels accelerated the resolution of acute inflammation.
• Degradation products of the hydrogels were characterized.
• Tissue response significantly influenced the functional lifetime of the implanted nanosensors.

Conclusions:

• Hydrogel crosslinking density is a key factor in modulating in-vivo tissue response to nanosensors.
• Optimized hydrogel formulation can enhance the biocompatibility and functional longevity of nanosensor implants.
• Understanding and controlling the host-material interaction is essential for successful in-vivo nanotechnology applications.