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Localization of platelet-activating factor receptor messenger RNA in the rat eye
1Department of Ophthalmology, Faculty of Medicine, University of Tokyo, Japan. mmori-tky@umin.ac.jp
Purpose:
To determine the distribution of platelet-activating factor (PAF) receptor in the rat eye.
Methods:
Platelet-activating factor receptor messenger RNA (mRNA) expression was evaluated with reverse transcription-polymerase chain reaction (RT-PCR) in RNAs from several rat ocular tissues. Distribution of the expression was determined with in situ hybridization in adult rat eye sections and a 35S-labeled complementary RNA probe synthesized from the rat PAF receptor complementary DNA. In situ hybridization was also done with sections immunostained with OX-42, a microglia marker.
Results:
RT-PCR revealed that levels of PAF receptor expression were similar among the ocular tissues studied. The in situ hybridization signals were found in the corneal epithelium, iris and ciliary body, and ganglion and microglial cells in the retina.
Conclusions:
Platelet-activating factor receptor mRNA was ubiquitously expressed in the rat eye with relative concentration in the corneal epithelium, iris and ciliary body, and retinal ganglion and microglial cells.
Insights
Platelet-activating factor (PAF) receptor mRNA is widely distributed throughout the rat eye. Key concentrations were observed in the corneal epithelium, iris, ciliary body, and retinal ganglion and microglial cells.
Area of Science:
- Ophthalmology
- Molecular Biology
- Immunology
Background:
- Platelet-activating factor (PAF) is a potent inflammatory mediator.
- Understanding the distribution of its receptor is crucial for investigating ocular inflammatory conditions.
Purpose of the Study:
- To elucidate the precise distribution of the platelet-activating factor (PAF) receptor within various tissues of the adult rat eye.
Main Methods:
- Reverse transcription-polymerase chain reaction (RT-PCR) was employed to assess PAF receptor mRNA expression levels.
- In situ hybridization, using a complementary RNA probe, localized PAF receptor mRNA expression in adult rat eye sections.
- Immunohistochemistry with OX-42 marker identified microglial cells.
Main Results:
- RT-PCR indicated similar levels of PAF receptor mRNA expression across multiple ocular tissues.
- In situ hybridization revealed significant PAF receptor expression in the corneal epithelium, iris, and ciliary body.
- Expression was also detected in retinal ganglion cells and microglial cells.
Conclusions:
- Platelet-activating factor receptor mRNA demonstrates ubiquitous expression in the rat eye.
- Relative concentrations of PAF receptor mRNA are notable in the corneal epithelium, iris, ciliary body, and retinal ganglion and microglial cells.