Abstract
It has recently been demonstrated that not only mature B lymphocytes, but also non-lymphoid cells, including cancer cells and neurons, express IgG. In the eye, an important immune privileged site, the presence of IgG has been ascribed to IgG entering the eye through breaches of the blood–ocular barrier. Here we demonstrate that the eye itself can produce IgG intrinsically. Applying immunohistochemistry, in situ hybridization, and RT-PCR, several intraocular structures were found to express proteins and mRNA transcripts of IgG heavy chains, light chains, V(D)J rearrangements, and enzymes required for V(D)J recombination. IgG receptors were also detected in the intraocular epithelium and endothelium. The extensive distribution of IgG and its receptors in intraocular structures indicates that locally produced IgG could play a significant role in maintaining the ocular microenvironment and protection of the eyes, and it might also be involved in the pathogenesis of age-related macular degeneration and some inflammatory diseases.
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Abbreviations
- AEC:
-
3-amino-9-ethyl-carbazole
- AH:
-
Aqueous humor
- AID:
-
Activation-induced cytidine deaminase
- AMD:
-
Age-related macular degeneration
- CPE:
-
Ciliary pigmented epithelia
- FcγRs:
-
Fc gamma receptors
- FcRn:
-
Neonatal Fc receptors
- Igγ:
-
IgG Gamma chain γ
- Igκ:
-
Ig Kappa light chain κ
- Igλ:
-
Ig Lambda chain λ
- IGHG:
-
Mouse IgG heavy chains
- IGHG1:
-
Constant regions of human IgG1
- IHC:
-
Immunohistochemistry
- IPE:
-
Iris pigmented epithelium
- ISH:
-
In situ hybridization
- µMT:
-
µ chain mutated
- RAG1:
-
Recombination activating gene -1
- RAG2:
-
Recombination activating gene -2
- RPE:
-
Retinal pigment epithelium
- SCID:
-
Severe combined immune deficient
- VDJн :
-
VDJ segment of Igγ
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Acknowledgments
This work was supported by grants from the National Natural Science Foundation of China (code: 30570686), Project 111 (B07001) of the Ministry of Education, China to Dr. Jiang Gu.
Conflicts of interest
No author had any conflict of interest. Dr. Jiang Gu had full access to all the data in this study and had final responsibility for the decision of publication.
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The first two institutions contributed equally to this study.
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Niu, N., Zhang, J., Sun, Y. et al. Expression and distribution of immunoglobulin G and its receptors in an immune privileged site: the eye. Cell. Mol. Life Sci. 68, 2481–2492 (2011). https://doi.org/10.1007/s00018-010-0572-7
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DOI: https://doi.org/10.1007/s00018-010-0572-7