Conjunctiva-associated lymphoid tissue - current knowledge, animal models and experimental prospects.

Area of Science:

• Ophthalmology
• Immunology
• Cell Biology

Background:

• The conjunctiva harbors organized lymphoid tissue, termed conjunctiva-associated lymphoid tissue (CALT).
• CALT is crucial for ocular surface immune defense, initiating and regulating responses.
• Its structure and function are comparable to other mucosal-associated lymphoid tissues.

Purpose of the Study:

• To review current knowledge of human conjunctiva-associated lymphoid tissue (CALT).
• To compare CALT structure and function with lymphoid tissues at other mucosal sites.
• To provide an update on CALT animal models and functional studies.

Main Methods:

• Literature review of human CALT.
• Comparative analysis of CALT with other mucosal-associated lymphoid tissues.
• Review of CALT animal models and functional studies, including transepithelial transport.
• Evaluation of two-photon microscopy applications in CALT research.

Main Results:

• CALT comprises intraepithelial lymphocytes, subepithelial lymphoid follicles, and associated vasculature.
• CALT plays a vital role in ocular surface protection through immune response regulation.
• Studies investigate transepithelial transport mechanisms and utilize advanced imaging like two-photon microscopy.

Conclusions:

• CALT is a critical component of the ocular immune system.
• Understanding CALT dynamics is essential for developing strategies against ocular surface threats.
• Further research, including advanced microscopy, enhances our knowledge of CALT's protective functions.