Transfer of the tobacco-specific carcinogens n'-nitrosonornicotine and 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone and benzo [a] into the milk of lactating rats

TY - JOUR

T1 - Transfer of the tobacco-specific carcinogens n'-nitrosonornicotine and 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone and benzo [a] into the milk of lactating rats

AU - Lavoie, Edmond J.

AU - Stern, Sharon L.

AU - Choi, Chang In

AU - Reinhardt, Joel

AU - Adams, John D.

N1 - Funding Information: These analytical studies were performed in the Jackson Automated Systems Laboratory in the American Health Foundation. These studies were supported in part from Grant CA29580 from the National Cancer Institute. We gratefully acknowledge The Cornell Tradition for partial support of one of the investigators, Ms S.Stern.

PY - 1987/3

Y1 - 1987/3

N2 - The extent to which some of the more prevalent and potent carcinogens in cigarette smoke could be transferred from circulating blood into the milk of lactating rats was determined. One hour after i.v. administration of benzo[a]pyrene (BaP), N'-nitrosonornicotine (NNN) and 4-(methylnitros-amino)-1-(3-pyridyl)-1-butanone (NNK) to the dams, the levels of these carcinogens were determined in both blood and milk specimens. The average amount of radioactivity detected 1 h after administration of 14C BaP was 0.21% of the administered dose per ml of milk as compared with 0.17% per ml of blood. The amount of NNN in milk ranged from 0.20 to 0.36% of the administered dose per ml which closely paralleled the levels detected in blood. NNK is readily con verted in vivo to 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL). The sum of NNK and NNAL was similar in the blood and milk of treated dams. There was, however, a major difference in the ratio of NNAL/NNK as detected in milk and blood. The ratio of NNAL/NNK in blood ranged from 1.3:1 to 1.9:1 while the ratio in milk ranged from 2.4:1 to 3.3:1. In a comparative study of the levels of NNN in the blood and milk of lactating rats at <1.0, 20, 60, 120 and 240 mm after administration, it was confirmed that similar concentrations of NNN are present in blood and milk 1 h after administration. These data indicate that these carcinogens, which are present in both cigarette smoke and tobacco, can be transferred into the milk of lactating rats.

AB - The extent to which some of the more prevalent and potent carcinogens in cigarette smoke could be transferred from circulating blood into the milk of lactating rats was determined. One hour after i.v. administration of benzo[a]pyrene (BaP), N'-nitrosonornicotine (NNN) and 4-(methylnitros-amino)-1-(3-pyridyl)-1-butanone (NNK) to the dams, the levels of these carcinogens were determined in both blood and milk specimens. The average amount of radioactivity detected 1 h after administration of 14C BaP was 0.21% of the administered dose per ml of milk as compared with 0.17% per ml of blood. The amount of NNN in milk ranged from 0.20 to 0.36% of the administered dose per ml which closely paralleled the levels detected in blood. NNK is readily con verted in vivo to 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL). The sum of NNK and NNAL was similar in the blood and milk of treated dams. There was, however, a major difference in the ratio of NNAL/NNK as detected in milk and blood. The ratio of NNAL/NNK in blood ranged from 1.3:1 to 1.9:1 while the ratio in milk ranged from 2.4:1 to 3.3:1. In a comparative study of the levels of NNN in the blood and milk of lactating rats at <1.0, 20, 60, 120 and 240 mm after administration, it was confirmed that similar concentrations of NNN are present in blood and milk 1 h after administration. These data indicate that these carcinogens, which are present in both cigarette smoke and tobacco, can be transferred into the milk of lactating rats.

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U2 - https://doi.org/10.1093/carcin/8.3.433

DO - https://doi.org/10.1093/carcin/8.3.433

M3 - Article

C2 - 3815738

SN - 0143-3334

VL - 8

SP - 433

EP - 437

JO - Carcinogenesis

JF - Carcinogenesis

IS - 3

ER -