This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: A distinctive black or dark brown lesion that appears on the eyes of some cats has long puzzled veterinarians. Now, researchers have identified two elements that may help explain what is happening inside the affected cornea.
Lionel Sebbag and Professor Ron Ofri of the Koret School of Veterinary Medicine at Hebrew University, examined feline corneal sequestra, a condition in which part of the cornea becomes damaged and necrotic, forming a characteristic dark lesion. The condition can cause chronic eye discomfort and sometimes requires surgical treatment. The work is published in the journal Veterinary Ophthalmology.
Over the years, several explanations have been proposed for the characteristic dark discoloration, including melanin and iron accumulation, while factors such as chronic corneal irritation, tear film abnormalities and viral infection have been investigated for their possible role in the development of the disease. However, both the origin of the discoloration and the underlying pathogenesis remain incompletely understood. "The uniqueness of this study is that it looks at a phenomenon we see in cats, essentially necrotic tissue on the cornea, from a different angle," the researchers said.
"There have been various theories about what causes the black color, including pigmentation, iron or other changes. Using a highly sensitive technique for elemental analysis, we identified two elements that clearly distinguished affected tissue from healthy corneas." The researchers added that the findings could eventually have implications beyond simply explaining the appearance of the disease. "These findings open a new direction for investigating how the disease develops and may ultimately help identify new diagnostic or therapeutic targets," the researchers said.
The researchers examined corneal tissue removed from 11 affected eyes from nine cats and compared it with healthy corneal samples from four control cats. They used particle-induced X-ray emission, known as PIXE, a highly sensitive technique capable of detecting trace elements in very small biological samples. The results revealed a striking difference between healthy and diseased tissue.
Iron and bromine were detected in the corneal sequestra but were absent from the healthy control samples. Other elements, including calcium, phosphorus, sodium, potassium and zinc, did not show significant differences between the two groups. The findings suggest that the dark lesions are not simply caused by ordinary mineral deposits.
Extract — continue reading at the source.
