|
Karyotype
|
modal number = 63; range = 54 to 70. The cells consistently have 18 to 20 marker chromosomes. They are: (t(1;?), del(1)(p13), del(2) (p11), t(2;?), t(7p, 19p), t(8;?), t(11;11) (p15;q13), t(14q,21q), t(6p,16p), t(X;?), and 10-12 others. There is only one copy per cell of structurally unchanged normal chromosomes for Nos. 1,2, 4, 10, 14, 16, and 18. No. 20 generally has 4 copies per cell and the X has 3 copies per cell. No Y chromosome was detected.
|
|
Derivation
|
The epithelial cell line, LS123, was established by L.P. Rutzky et al, in 1974 from the second in a series of three primary colonic tumors resected from a 65 year old Caucasian female.
In 1950, a primary colon tumor was resected from the patient (41 years old at that time). 24 years later a second primary tumor classified as a Dukes' type B mucin producing colon adenocarcinoma was excised and the cells were cultured.
A third primary tumor was discovered in 1980 in an area just proximal to the colostomy and was resected.
|
|
Clinical Data
|
65 years
Caucasian
female
|
|
Genes Expressed
|
carcinoembryonic antigen (CEA), 9 ng/mL per 106 cells per 10 days; mucin
|
|
Effects
|
No, in nude mice (Tumors did not develop within three months in nude mice (5/5) inoculated subcutaneously with 10(7) cells.)
|
|
Comments
|
The established cell line is aneuploid, releases small amounts of carcinoembryonic antigen, fails to grow progressively in nude mice, and forms colonies only in enriched semisolid medium developed for tumor stem cells.
LS123 cells grow as confluent cell monolayers in either low serum or serum free medium.
In the chick embryonic skin assay, the cells grow as a well differentiated abnormal colonic epithelium with little mitotic activity and low invasiveness.
Although LS123 exhibits several properties associated with neoplasia, they have little invasive potential and may represent an early stage in tumor development.
The plating efficiency is 12% in the medium recommended below.
This cell line is non-tumorigenic in mice. Tumors did not develop within three months in nude mice (5/5) inoculated subcutaneously with 107 cells.
|