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Updated: Dec 12, 2025
Optimized Protocol for Retinal Wholemount Preparation for Imaging and Immunohistochemistry
Published on: December 13, 2013
Optimized technique to extract and fix Olive ridley turtle hatchling retina for histological study
Janeth Guadalupe De la Cruz Pino1, Jorge E Morales Mávil1, Aurora Del Carmen Sánchez García2
1Laboratorio Biología de la Conducta, Instituto de Neuroetología, Universidad Veracruzana, Av. Dr. Luis Castelazo S/N, Km 3.5. Carretera Federal, Col. Industrial Ánimas, C.P. 91190, Xalapa, Veracruz, Mexico.
This study introduces an optimized ocular tissue fixation method for Olive ridley sea turtles using 10% formalin intraocular injection and immersion. This technique effectively preserves eye structure and retinal organization for histopathological studies.
Area of Science:
- Veterinary Pathology
- Marine Biology
- Histology
Background:
- Efficient tissue fixation is crucial for preserving cytoarchitecture, chemical composition, and organization in physiological and histopathological studies.
- Ocular tissue preservation presents unique challenges due to the eye's complex structure.
Purpose of the Study:
- To establish a microsurgery technique for obtaining ocular tissue.
- To optimize an immersion fixation protocol using 10% formalin via intraocular injection for Olive ridley sea turtle hatchlings (Lepidochelys olivacea).
Main Methods:
- A novel intraocular/immersion fixation protocol was developed and compared to traditional methods.
- Five fixation protocols were evaluated: frozen, frozen with formalin immersion, fresh with formalin immersion, fresh with PBS intraocular injection followed by formalin immersion, and fresh with formalin intraocular injection followed by formalin immersion.
- Histological analysis was performed to assess tissue preservation.
Main Results:
- The optimized intraocular/immersion fixation protocol (10% formalin-intraocular followed by immersion) significantly improved the conservation of eyeball shape.
- This protocol maintained superior cell integrity and the organization of retinal layers in sea turtle hatchlings compared to other methods.
- Frozen eye methods and standard immersion fixation showed less optimal preservation.
Conclusions:
- The developed 10% formalin-intraocular injection followed by immersion fixation is highly effective for preserving ocular tissue in sea turtle hatchlings.
- This method is key for advancing studies on sea turtle ophthalmology and pathology.
- The technique may be adaptable for other animal species with similar ocular anatomy.
