title: A new human hepatocellular carcinoma cell line (HAK-2) forms various structures in collagen gel matrices.
abstract: We established a new human hepatocellular carcinoma (HCC) cell line, designated HAK-2, from a surgically resected HCC of a 57-yr-old Japanese man. The patient's tumor consisted of 5 different histological features in a single nodule: well-differentiated HCC with trabecular pattern; and moderately differentiated HCC with 4 different patterns (i.e., trabecular, pseudoglandular, solid, and scirrhous). Morphologically, HAK-2 cells on a plastic dish showed oval-shaped nuclei and large flat, polygonal eosinophilic cytoplasm and proliferated in a monolayered sheet with a population doubling time of 36.8 hours. Meanwhile, various structures, such as compact, trabecular, and tubular arrangements, were induced in HAK-2 cells cultured in type I collagen gel matrix. Also, HAK-2 cells in vitro underwent spontaneous apoptosis more frequently than other HCC cell lines examined. HAK-2 cells secreted various plasma proteins including albumin into the culture medium. Chromosome and flow cytometric analyses revealed that HAK-2 had many structural abnormalities with human karyotype and a single aneuploid cell population with a DNA index of 3.7, respectively. These findings suggest that HAK-2 is a new human HCC cell line representing two morphological characteristics; (1) formation of various structures in the presence of extracellular matrix and (2) frequent spontaneous apoptosis in vitro.
authors.affiliation: First Department of Pathology, Kurume University School of Medicine.
authors.forename: M
authors.initials: M
authors.lastname: Haramaki
authors.forename: H
authors.initials: H
authors.lastname: Yano
authors.forename: A
authors.initials: A
authors.lastname: Iemura
authors.forename: S
authors.initials: S
authors.lastname: Momosaki
authors.forename: S
authors.initials: S
authors.lastname: Ogasawara
authors.forename: M
authors.initials: M
authors.lastname: Inoue
authors.forename: R
authors.initials: R
authors.lastname: Yamaguchi
authors.forename: A
authors.initials: A
authors.lastname: Kusaba
authors.forename: I
authors.initials: I
authors.lastname: Utsunomiya
authors.forename: M
authors.initials: M
authors.lastname: Kojiro
mesh_terms: D000782:Aneuploidy; D000818:Animals; D017209:Apoptosis; D006528:Carcinoma, Hepatocellular / Q000235:genetics / Q000473:pathology / Q000648:ultrastructure*; D003094:Collagen; D003470:Culture Media; D004273:DNA, Neoplasm / Q000032:analysis; D005782:Gels; D006801:Humans; D007621:Karyotyping; D008113:Liver Neoplasms / Q000235:genetics / Q000473:pathology / Q000648:ultrastructure*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008853:Microscopy; D008875:Middle Aged; D009368:Neoplasm Transplantation; D014407:Tumor Cells, Cultured
chemical_list: D003470:Culture Media; D004273:DNA, Neoplasm; D005782:Gels; D003094:Collagen