The critical role of lymph nodes in corneal alloimmunization and graft rejection

Invest Ophthalmol Vis Sci. 2001 May;42(6):1293-8.


Purpose: To elucidate the role of draining cervical lymph nodes (CLNs) in corneal alloimmunity.

Methods: Fully mismatched orthotopic corneal transplantation was performed in BALB/c hosts that had their CLNs excised before transplantation (CLN(-)). Normal hosts (CLN(+)), splenectomized mice (Sp(-)), and those without either CLNs or spleen (CLN(-)/Sp(-)) served as comparison groups. To determine the contribution of CLNs to alloimmunity more directly, CLN(-) mice were reconstituted by grafting LNs from other BALB/c mice to their cervical lymphatic chains, thus deriving CLN(-/+) mice. Tetramethyl rhodamine isothiocyanate's (TRITC) flow to draining CLNs was used as a measure of afferent lymph flow. Graft survival and allospecific delayed-type hypersensitivity (DTH) were used as measures of alloreactivity.

Results: Fifty percent of normal control and 12% of Sp(-) hosts accepted the allografts. In contrast, 100% of CLN(-) and 88% of CLN(-)/Sp(-) hosts accepted allografts indefinitely (P < 0.01). Additionally, all CLN(-) hosts failed to demonstrate allospecific DTH (P < 0.001). CLN(-/+) mice reconstituted with LN from naïve animals showed graft survival rates and DTH responses that were indistinguishable from those of naïve CLN(+) mice. Of particular interest, however, is that mice reconstituted with CLNs from hosts with rejected corneal grafts had swift rejection of subsequent corneal grafts and exhibited strong donor-specific DTH. In contrast, mice reconstituted with CLNs from hosts with accepted corneal grafts showed rejection of subsequent corneal grafts in a manner that was indistinguishable from rejection in naïve CLN(+) hosts.

Conclusions: Draining CLNs play a critical role in allosensitization and rejection. In contrast to the spleen, draining CLNs do not appear to play a critical role in tolerance induction in corneal transplantation.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Cornea / immunology*
  • Corneal Transplantation / immunology*
  • Graft Rejection / immunology*
  • Graft Survival / immunology
  • Hypersensitivity, Delayed / immunology
  • Immunity
  • Immunization*
  • Lymph Nodes / physiology*
  • Male
  • Mice
  • Mice, Inbred BALB C
  • Mice, Inbred C57BL
  • Neck
  • Spleen / immunology
  • Splenectomy
  • Transplantation, Homologous