The mechanism of reduction of cell-mediated cytotoxicity in neonatally thymectomized mice

H. Kawauchi, K. Taniguchi, C. Kubo, Y. Shimamoto, K. Nomoto

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Abstract

The effect of neonatal thymectomy at various times after birth (Tx-1, Tx-7) on effector and suppressor T cells responsible for cell-mediated cytotoxicity (CMC) for allogeneic antigens was determined. Following in-vitro primary mixed lymphocyte cultures, in the absence of T-cell growth factor (TCGF), alloreactive CMC was not detected in spleen cells of Tx-1 mice, but was detected in spleen cells of Tx-7 mice at as high levels as in those of sham-operated mice. However, in the presence of TCGF, as much alloreactive CMC was detected in spleen cells of Tx-1 mice as in those of Tx-7 mice. Furthermore, TCGF production was not detected in spleen cells of Tx-1 mice but was detected in those of Tx-7 mice. In in-vivo experiments, inhibition of allogeneic tumour growth and CMC in spleen cells showed the same pattern as in in-vitro experiments. These results support the concept that the reduction of CMC in Tx-1 mice might be due to a defect in helper function (TCGF-producing capacity) rather than to a defect in cytotoxic T lymphocytes and/or cytotoxic T lymphocyte precursors. Alloreactive suppressor T cells could not be induced in spleen cells of Tx-1 mice but were induced in spleen cells of Tx-7 mice. Therefore it was suggested that alloreactive suppressor T cells require the presence of the thymus for 7 days after birth in their development.

Original languageEnglish
Pages (from-to)199-205
Number of pages7
JournalImmunology
Volume50
Issue number2
Publication statusPublished - 1983

All Science Journal Classification (ASJC) codes

  • Immunology and Allergy
  • Immunology

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    Kawauchi, H., Taniguchi, K., Kubo, C., Shimamoto, Y., & Nomoto, K. (1983). The mechanism of reduction of cell-mediated cytotoxicity in neonatally thymectomized mice. Immunology, 50(2), 199-205.