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Age and the immune response in pediatric renal transplantation
1UCLA Medical Center 90024.
Insights
Young children may have a heightened immune response, increasing their risk for renal allograft rejection compared to adults. This suggests tailored immunosuppression strategies may improve transplant outcomes in pediatric patients.
Area of Science:
- Immunology
- Pediatric Nephrology
- Transplantation
Background:
- Renal transplant outcomes are poorer in young children than in older children or adults.
- This disparity raises questions about age-related differences in immune reactivity and allograft rejection.
- Preliminary data suggest young children may be an immunologically distinct subgroup at higher risk for rejection.
Purpose of the Study:
- To investigate potential differences in immune responsiveness between young children and adults concerning renal allograft rejection.
- To explore whether young children represent a unique immunologic subgroup with an increased propensity for rejection.
Main Methods:
- Comparison of histocompatibility factors, including HLA typing and lymphocytotoxicity crossmatch results, between pediatric and adult transplant recipients.
- Assessment of cellular immunity using non-specific tests to identify strong immunologic responders.
- Quantification of T lymphocyte subsets (CD2+, CD3+, CD4+) and functional indices of cellular immune function in young children.
Main Results:
- Subtle differences in HLA typing may exist between infants and older individuals.
- Children may face higher rejection risks with historically positive, currently-negative crossmatches.
- Children aged 5 and younger exhibit increased CD2+, CD3+, and CD4+ T lymphocytes and heightened cellular immune function compared to older children.
Conclusions:
- Young children may possess heightened immunologic responsiveness, potentially increasing their risk for renal allograft rejection.
- These findings suggest that young children might be a distinct immunologic subgroup requiring specific consideration.
- Optimizing renal transplant outcomes in pediatric patients may necessitate modifications in immunosuppression protocols.
Abstract:
Because renal transplant outcome is poorer in young children when compared with older children or adults, it is reasonable to question whether immune reactivity relative to renal allograft rejection differs between young children and adults. While this hypothesis is far from established, preliminary data suggest that young children may represent an immunologically-defined subgroup distinct from adults and perhaps at high risk for renal allograft rejection. From a histocompatibility standpoint, infants may show some subtle differences in HLA typing results when compared with older children or adults. Children may also be at higher risk than adults for rejection when the transplant is performed in the presence of a historically positive, currently-negative lymphocytotoxicity crossmatch. Several non-specific tests of cellular immunity have been used to characterize the strong immunologic responder, i.e. the person who has an increase tendency to vigorously reject a renal allograft. Children in general and young children in particular may fall into this group. Children 5 years old and younger have significantly increased numbers of CD2+, CD3+, and CD4+ T lymphocytes when compared with older children. Young children also have higher than expected functional indices of cellular immune function. Taken together, these data suggest that children, and particularly young children, may have a heightened immunologic responsiveness, which may in turn represent an increased propensity for allograft rejection. Appropriate modification in immunosuppression may be indicated to optimize renal transplant outcome.