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. 1993 May;67(5):885–892. doi: 10.1038/bjc.1993.166

A rodent model for testicular involvement in acute lymphoblastic leukaemia.

K Jahnukainen 1, I Morris 1, S Roe 1, T T Salmi 1, A Mäkipernaa 1, P Pöllänen 1
PMCID: PMC1968455  PMID: 8494720

Abstract

The testis is the third common site of relapse after primary treatment of childhood acute lymphoblastic leukaemia, but in adults relatively few testicular relapses of acute lymphoblastic leukaemia have been reported. In the present investigation the differences in the behaviour of leukaemia in immature and mature rat testis and the interactions of testicular and leukaemic cells were studied. Intraperitoneal injection of rat T-leukaemic cells to sexually immature animals induced testicular infiltrations in 100% of animals in 17 days. The infiltrations were small and located perivascularly in the interstitial tissue. Intraperitoneal injection of T-leukaemic cells to sexually mature animals induced testicular infiltrates in 42% of the animals. Leukaemic cells injected directly to the lymph sinusoids of sexually immature and mature testis proliferated rapidly causing testicular enlargement. The M(r) > 5 K fraction of extracts of 50 days old normal rat testes inhibited 3H-TdR incorporation of both normal and leukaemic ConA-stimulated rat lymphoblasts significantly. The same fraction of extracts of testes of 25 days old rats did not have any effect on 3H-TdR incorporation. The normally occurring pubertal increase in the lymphocyte inhibitory effect of the M(r) > 5 K fraction of testis extracts on 3H-TdR incorporation of PBL was prevented following either intraperitoneal or intratesticular injection of rat leukaemic lymphoblasts administered at the age of 25 days. The present observations suggest that physiological pubertal changes in the permeability of vascular endothelium and immunosuppressive effect of the testis may be important explanatory factors for the smaller number of testicular relapses in men compared to boys seen after treatment of ALL.

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Selected References

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