Optimized protocol for retinal wholemount preparation for imaging and immunohistochemistry.

Area of Science:

• Biological Sciences
• Materials Science
• Biomedical Engineering

Background:

• Immunohistochemical assessment often faces challenges with delicate tissue integrity.
• Fragile tissues can be damaged by standard processing protocols, limiting experimental options.
• Existing methods lack sufficient support for both living and fixed delicate tissues.

Purpose of the Study:

• To present a novel method using a ring-supported hydrophilized PTFE membrane for supporting fragile tissues.
• To demonstrate the utility of this method for both living and fixed tissue processing in immunohistochemistry.
• To overcome limitations associated with handling delicate tissues during complex biological assays.

Main Methods:

• A ring-supported hydrophilized PTFE membrane was employed to provide structural support to tissue.
• The method was validated using bolus loading of fluorescent markers into living retinal tissue.
• A procedure for antibody staining of carbodiimide-fixed tissue, supported by the membrane, was developed.

Main Results:

• The membrane successfully maintained tissue integrity during fluorescent marker injection and antibody staining.
• The technique facilitated quick visualization of targeted structures in living retinal tissue.
• Carbodiimide-fixed fragile tissue was effectively processed for synaptic protein visualization using the membrane support.

Conclusions:

• The ring-supported hydrophilized PTFE membrane offers a versatile solution for preserving fragile tissue integrity.
• This method expands the applicability of various immunohistochemical protocols to delicate biological samples.
• The technique is adaptable for diverse fragile tissues beyond retinal samples, enhancing research capabilities.