-transparent.png){kind=logo}
Following treatment of Syrian hamster embryo cells with benzo(a)pyrene, the time required for the expression of enhanced fibrinolytic activity was examined. For this study, the fibrin-agarose overlay method was developed to distinguish the activity of normal and transformed colonies of hamster cells. Colonies possessing enhanced fibrinolytic activity were not observed one passage (2 weeks after treatment). Morphologically transformed colonies, which exhibited no enhanced fibrinolytic activity, were observed 8 days following treatment. In contrast to these two early changes, cells capable of growth in soft agar were observed much later (6 to 8 weeks after treatment). Untreated Syrian hamster embryo cells generally senesced and did not exhibit enhanced fibrinolytic activity. Approximately 1 of 10 untreated cultures escaped senescence and evolved as a continuous cell line; such cultures frequently exhibited enhanced fibrinolytic activity. These results suggest that the acquisition of enhanced fibrinolytic activity, while perhaps not a cause of neoplastic transformation, may reflect a loss of control of the normal function of the cellular genetic apparatus during the process of transformation.
J C Barrett, and
B D Crawford, and
D L Grady, and
L D Hester, and
P A Jones, and
W F Benedict, and
P O Ts'o
January 1983,
Pharmacology,
J C Barrett, and
B D Crawford, and
D L Grady, and
L D Hester, and
P A Jones, and
W F Benedict, and
P O Ts'o
July 1978,
Chemico-biological interactions,
J C Barrett, and
B D Crawford, and
D L Grady, and
L D Hester, and
P A Jones, and
W F Benedict, and
P O Ts'o
January 1981,
Carcinogenesis,
J C Barrett, and
B D Crawford, and
D L Grady, and
L D Hester, and
P A Jones, and
W F Benedict, and
P O Ts'o
June 1988,
Carcinogenesis,
J C Barrett, and
B D Crawford, and
D L Grady, and
L D Hester, and
P A Jones, and
W F Benedict, and
P O Ts'o
November 1986,
Cancer letters,
J C Barrett, and
B D Crawford, and
D L Grady, and
L D Hester, and
P A Jones, and
W F Benedict, and
P O Ts'o
August 2001,
Mutation research,
J C Barrett, and
B D Crawford, and
D L Grady, and
L D Hester, and
P A Jones, and
W F Benedict, and
P O Ts'o
January 1986,
Environmental mutagenesis,
J C Barrett, and
B D Crawford, and
D L Grady, and
L D Hester, and
P A Jones, and
W F Benedict, and
P O Ts'o
December 1990,
Toxicology,
J C Barrett, and
B D Crawford, and
D L Grady, and
L D Hester, and
P A Jones, and
W F Benedict, and
P O Ts'o
August 1971,
Proceedings of the National Academy of Sciences of the United States of America,
J C Barrett, and
B D Crawford, and
D L Grady, and
L D Hester, and
P A Jones, and
W F Benedict, and
P O Ts'o
October 1982,
Cancer research,
