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. 1998 Aug;78(3):301–311. doi: 10.1038/bjc.1998.491

Tumour induction by methyl-nitroso-urea following preconceptional paternal contamination with plutonium-239.

B I Lord 1, L B Woolford 1, L Wang 1, V A Stones 1, D McDonald 1, S A Lorimore 1, D Papworth 1, E G Wright 1, D Scott 1
PMCID: PMC2063036  PMID: 9703275

Abstract

We have investigated the possibility that transgenerational effects from preconceptional paternal irradiation (PPI) may render offspring more vulnerable to secondary exposure to an unrelated carcinogen. 239Pu (0, 128 or 256 Bq g(-1)) was administered by intravenous injection to male mice, 12 weeks before mating with normal females. Two strains of mouse were used -- CBA/H and BDF1. Haemopoietic spleen colony-forming units (CFU-S) and fibroblastoid colony-forming units (CFU-F), a component of their regulatory microenvironment, were assayed independently in individual offspring at 6, 12 and 19 weeks of age. Bone marrow and spleen from each of these mice were grown in suspension culture for 2 or 7 days for assessment of chromosomal aberrations. Female BDF1 were injected with methyl-nitroso-urea (MNU) as a secondary carcinogen at 10 weeks of age and monitored for onset of leukaemia/lymphoma. Mean values of CFU-S and CFU-F were unaffected by preconceptional paternal plutonium-239 (PP-239Pu), although for CFU-F in particular there was an apparent increase in variation between individual animals. There was significant evidence of an increase in chromosomal aberrations with dose in bone marrow but not in spleen. By 250 days, 68% of MNU-treated control animals (no PPI) had developed thymic lymphoma (62%) or leukaemia (38%). The first case arose 89 days after MNU administration. In the groups with PPI, leukaemia/lymphoma developed from 28 days earlier, rising to 90% by 250 days. Leukaemia (65%) now predominated over lymphoma (35%). This second generation excess of leukaemia appears to be the result of PPI and may be related to inherited changes that affect the development of haemopoietic stem cells.

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Selected References

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