Hepatoma carcinoma

In other transcriptionally regulated Ad constructs described to date, the El A promoter has been removed and replaced with tumor or tissue-specific promoters (81-84). A list of different promoters that have been used to date is shown in Table 1. In some cases, interference from the nearby inverted terminal repeat (ITR) sequence can result in the loss of promoter strength and fidelity (85). Selectivity can be enhanced with the use of silencer (86) or insulator sequences (87). For example, the AdEla04i viras using the artificial a-fetoprotein (AFP) promoter to express ElA needed six copies of a silencer sequence to repress the promoter activity in normal hepatocytes. This virus showed specificity and potency for hepatoma carcinoma tumors and not in non-AFP- producing cells or in normal hepatocytes (86). 

Uracil is used more effectively, in nucleic acid synthesis within a rat hepatoma than in normal liver. This observation appears to have stimulated the synthesis of 5-fluorouracil (1027) as an antimetabolite mainly because the introduction of a fluorine atom involves a minimal increase in size. In the event, 5-fluorouracil did prove to have antineoplastic activity and it is now a valuable drug for treatment of tumors of the breast, colon or rectum, and to a lesser extent, gastric, hepatic, pancreatic, uterine, ovarian and bladder carcinomas. As with other drugs which interfere with DNA synthesis, the therapeutic index is quite low and great care is required during treatment (69MI21301). 

Royleanone, horminone, and acetyl horminone isolated from the roots of Salvia officinalis L. abrogated the survival of colon carcinoma cell Caco-2 and human hepatoma cell HepG2, cultured in vitro with induction of DNA breaks (48). 

Daunomycin Soft-tissue sarcomas, Mammalian carcinoma, Hepatoma... 

In humans, cases of hepatomas have appeared years after acute exposure to carbon tetrachloride, however, none of the cases could establish a causal link between the exposure and development of neoplasms." Epidemiological studies have also given inconclusive results. A cancer mortality study of a population of rubber workers reported a significantly elevated odds ratio relating carbon tetrachloride with lymphatic leukemia, and lymphosarcoma and reticulum cell carcinoma." A recent retrospective cohort mortality study of aircraft maintenance workers found an increased risk of... 

No excess of cancer was reported in two follow-up smdies of affected individuals in Turkey about 20-30 years after consumption of contaminated grain had ceased. " In mice, liver tumors were observed after exposure to HCB at 12-24mg/kg/day in the diet, but not at 6mg/kg/day. Hepatomas, hepatocellular carcinomas, bile duct adenomas, and renal cell adenomas were observed in rats after dietary administration." Liver tumors were also observed in 100% of surviving females and 16% of males after dietary administration to rats for 90 weeks. In another study, increased incidence of parathyroid adenomas and adrenal pheochromocytomas were observed in male and female rats and liver neoplastic nodules in females of the Ei generation in a two-generation feeding study. 

MOCA was fed to male and female mice for 18 months at a dose of either 1 or 2 g/kg in female mice, but not in males, a statistically significant incidence of hepatoma was observed. In addition, a higher incidence of hemangiosarcomas and hemangiomas was observed in treated animals compared with controls. Urinary bladder tumors (primarily papillary transitional cell carcinomas) occurred in dogs given 100 mg of MOCA by capsule for up to 9.0 years. ... 

Cell lines established from human liver cancer cells can be derived from primary hepatocellular carcinoma or hepatoblastoma cells [10]. For example, the well known HepG2 fine was derived from hepatoblastoma cells. Such cells can be employed effectively if the function of normal liver cells has been highly preserved. In practice, however, such cells contain a high proportion of abnormal genetic component, which inhibits their ability to express normal protein synthesis and enzyme activity. Potential problems, such as the loss of liver specific functions and the possibifity of metastasis, which could arise from the use of hepatoma cells have not yet been satisfactorily discussed [13]. 

Carboxyhemoglobinaemia Chronic obstructive airways disease Pulmonary hypoventilation syndrome Right-to-left cardiac shunt Absolute - physiologically inappropriate Ectopic erythropoietin production Renal carcinoma and cysts Hepatoma... 

Hepatocellular carcinoma and benign hepatomas are rare complications of oral contraceptive and tamoxifen use. 

In the case of rat and human-breast cancer, an increase in serum-sialyltransferase activity is considered to be the consequence of both increased production and release, the latter perhaps through cell-surface shedding of the enzyme from the metastasizing, mammary-tumor cells.290 Accordingly, release of large amounts of sialyltransferase from hepatoma cell-lines derived from patients having hepatocellular carcinoma was observed, in contrast to cell lines derived from nomial human-liver.291 An increased level of sialyltransferase has been observed in regenerating rat-liver.292... 

In various human tumour cell lines (lymphoblastic cell line, CCRF CEM gastric carcinoma cell line, St 23132 hepatoma-derived cell line, HepG2 colon-carcinoma cell line, Caco-2) coumarin [IC50 values ranging from 232 to 522 pg/mL] and its major metabolite 7-hydroxycoumarin [IC50 values ranging from 110 to 436 pg/mL] inhibited... 

Subsequently, also the L. michauxii root methanol extract was found to be cytotoxic to cultured human hepatoma (HepG2) and colon carcinoma (Caco-2) cells, inducing necrotic death. There was no report on the isolation and characterisation of the active compounds present in this extract [20]. 

The increased expression of adhesion molecules by the endothelium may activate polymorphonuclear neutrophils (PMN) in rabbits [72], During endotoxic shock, activated PMNs release their granule content and secrete both proinflammatory and cytotoxic molecules. Pickaver et al. [73] were the first to show PMN cytotoxicity against tumor cells. We showed that PMNs are toxic for PROb colon tumor cells [74] in BDEX rats. In vivo, PMNs have been implicated in the Schwartzman reaction [75], and may be involved in LPS-induced tumor necrosis. PMNs, when activated by LPS, synthesize and release NO. The role of NO in tumor growth will be discussed later. The decrease in tumor growth after intradermal injections of LPS is attributed to the induction of TNF-a secretion by PMNs both in intradermal tumors (Meth A sarcoma in BALB/c mice, MH-134 hepatoma in C3H/He mice, Lewis Lung carcinomas in C57BL/6 mice) and pulmonary Meth A metastases [76,77],... 

Brooks JJ. Hepatoma associated with diethylstilbestrol therapy for prostatic carcinoma. J Urol 1982 128(5) 1044-5. 

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