Postinflammatory cataracts in the mouse: induction by human mycoplasma-like organisms

Area of Science:

• Ophthalmology
• Infectious Diseases
• Microbiology

Background:

• Cataracts frequently develop secondary to uveitis in humans.
• The causative infectious agent is rarely identified within the cataract itself.
• Mycoplasma-like organisms (MLO) have been implicated in human uveitis and retinitis, often co-occurring with cataracts.

Purpose of the Study:

• To investigate the potential role of Mycoplasma-like organisms (MLO) in the development of cataracts.
• To determine if MLO can penetrate ocular tissues and induce cataract formation.

Main Methods:

• Transmission electron microscopy was used to detect MLO in parasitized cells.
• MLO from a human source were inoculated into mouse eyelids to induce experimental ocular disease.
• Cataracts and the presence of MLO within ocular tissues, including the lens, were examined in affected mice.

Main Results:

• Experimental inoculation of MLO induced chronic, progressive intraocular inflammation in mice.
• MLO were detected within intraocular leukocytes in 15% of inoculated mice.
• Cataracts were observed in 14 out of 15 affected mice, with MLO-parasitized leukocytes found within the lens.

Conclusions:

• MLO were found within the lens capsules of mice with experimentally induced uveitis and cataracts.
• These findings suggest that MLO can penetrate the lens and may be a direct cause of cataract formation.
• The study highlights the potential for MLO to cause human cataracts and discusses diagnostic and therapeutic strategies.