Elevated Inflammatory Cytokines Persist in the Aqueous Humor Years After Cataract Surgery

Area of Science:

• Ophthalmology
• Immunology
• Molecular Biology

Background:

• Limited data exists on aqueous humor (AH) inflammation and cytokine profiles in adult cataract patients post-phacoemulsification without other ocular conditions.
• Cataract surgery is a common procedure, and understanding its long-term ocular effects is crucial.

Purpose of the Study:

• To investigate and quantify inflammation and cytokine levels in the aqueous humor of adult patients following phacoemulsification cataract extraction.
• To identify specific biomarkers associated with post-cataract surgery inflammation.

Main Methods:

• Aqueous humor samples were collected from healthy donors and patients with a history of cataract surgery (3-12 years prior).
• Sixty-three cytokines and growth factors were measured using bead-based ProcartaPlex immunoassays.
• Statistical analyses included correlation, logistic regression, and ridge regression to develop a post-cataract surgery inflammation index (PCSII).

Main Results:

• 34 out of 63 analyzed molecules showed significant differences between groups.
• Elevated levels of CD40L, IL-7, MIP-1α, and LIF were observed post-surgery, while IL-23, TRAIL, IL-12p70, IFNγ, MIP-3α, and SCF were decreased.
• A novel PCSII was developed, effectively differentiating between post-cataract surgery and control donors and stratifying patients by inflammation risk.

Conclusions:

• Cataract surgery can induce a chronic inflammatory state in the aqueous humor.
• This inflammation may persist for years after the surgical procedure.
• The identified cytokines and the PCSII offer potential tools for monitoring and managing post-surgical ocular inflammation.