dopa decarboxylase/neoplasms

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Expression of neuroendocrine cell markers L-dopa decarboxylase, chromogranin A, and dense core granules in human tumors of endocrine and nonendocrine origin.

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We evaluated the usefulness of L-dopa decarboxylase (DDC) as a tumor marker of neuroendocrine (NE) cell differentiation by measuring its expression in 432 human tumors of diverse types and origins. A subset of these tumors and cell lines derived from them also were studied for expression of two

Evidence for L-Dopa decarboxylase activity in cancer cell cytotoxicity induced by Docetaxel and Mitoxantrone.

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Background - L-Dopa decarboxylase (DDC) expression has been implicated in the biochemistry of several human cancers. Docetaxel and Mitoxantrone are two widely used anticancer agents. Docetaxel is a semi-synthetic analogue of paclitaxel, an extract from the bark of the rare Pacific yew tree Taxus

Human medullary thyroid carcinoma in culture provides a model relating growth dynamics, endocrine cell differentiation, and tumor progression.

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We used an unique model, human medullary thyroid carcinoma (MTC) in culture (the TT line), to study features of neuroendocrine-related biochemistry in relationship to growth, differentiation, and tumor progression. Tumor tissues from patients with virulent MTC contain a very heterogeneous

Biological heterogeneity of small cell lung cancer.

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Over the past 20 years considerable advances have been made in the characterization of the biologic properties of small cell lung cancer. The recognition that this histologic type of lung cancer, in contrast to the other major types of lung cancer, is highly sensitive to both chemotherapy and

The neurotoxin 1-methyl-4-phenylpyridinium: a selective cytostatic agent in small-cell lung cancer cell lines with neuroendocrine properties.

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BACKGROUND Small-cell lung cancer (SCLC) is a common malignancy that is usually fatal, since it metastasizes and recurs even after aggressive chemotherapy. While the cellular origin of this cancer is not well established, the cells of certain tumors exhibit neuroendocrine markers, including L-dopa

Biochemical characterization of peptide alpha-amidation enzyme activities of human neuroendocrine lung cancer cell lines.

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Peptide alpha-amidation is a posttranslational modification of approximately half of all endocrine and neuroendocrine peptide hormones, including several hormones with mitogenic effects for tumor cells, and is typically essential for complete hormonal bioactivity. alpha-Amidated peptide hormones

Reverse transcriptase-polymerase chain reaction as an ancillary molecular technique in the diagnosis of small blue round cell tumors by fine-needle aspiration cytology.

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We evaluated the feasibility and usefulness of reverse transcriptase-polymerase chain reaction (RT-PCR) on fine-needle aspirates for categorization of small blue round cell tumors (SBRCTs). A total of 51 cases, including 25 Ewing sarcoma/peripheral primitive neuroectodermal tumors (PNETs), 11

Use of tumor-specific gene expression for the differential diagnosis of neuroblastoma from other pediatric small round-cell malignancies.

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The differential diagnosis of neuroblastoma from other small round-cell tumors of childhood, although clinically of great importance, is sometimes difficult due to the almost indistinguishable appearance of such tumors by conventional microscopy. Because neuroblastomas are characterized by the

Isolation and identification of L-dopa decarboxylase as a protein that binds to and enhances transcriptional activity of the androgen receptor using the repressed transactivator yeast two-hybrid system.

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The AR (androgen receptor) is a ligand-regulated transcription factor, which belongs to the steroid receptor family and plays an essential role in growth and development of the prostate. Transcriptional activity of steroid receptors is modulated by interaction with co-regulator proteins and yeast

Molecular characterization of tumors from a transgenic mouse adrenal tumor model: comparison with human pheochromocytoma.

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Adrenal neuroblastoma and pheochromocytoma have the same embryonic origin from neural crest cells and mainly arise from the adrenal medulla. Recently, transgenic mice exhibiting tumors in the bilateral adrenal medulla by the expression of SV40 T-antigen were developed. In this study, we investigated

Quantification and study of the L-DOPA decarboxylase expression in gastric adenocarcinoma cells treated with chemotherapeutic substances.

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3,4-Dihydroxy-L-phenylalanine decarboxylase (DDC) is an enzyme implicated in the biosynthetic pathways of the neurotransmitters dopamine and probably serotonin. DDC gene expression has been studied in numerous malignancies and the corresponding data have shown remarkable alterations in the mRNA

Structural perspective on the direct inhibition mechanism of EGCG on mammalian histidine decarboxylase and DOPA decarboxylase.

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Histidine decarboxylase (HDC) and l-aromatic amino acid decarboxylase (DDC) are homologous enzymes that are responsible for the synthesis of important neuroactive amines related to inflammatory, neurodegenerative, and neoplastic diseases. Epigallocatechin-3-gallate (EGCG), the most abundant catechin

Induction of phenotypic changes in SCLC cell lines in vitro by hexamethylene bisacetamide, sodium butyrate, and cyclic AMP.

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BACKGROUND Hexamethylene bisacetamide (HMBA), sodium butyrate (NaBt), and cyclic AMP (cAMP) have been shown to induce differentiation, which may regulate tumour growth differently from conventional cytotoxic drugs. It was the intention in the present study to determine whether alterations could be

Effects of N-ethyl,N-nitrosourea on monoamine concentrations and metabolizing enzymes in mouse brain regions.

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N-ethyl,N-nitrosourea is a well known alkylating agent and produces central nervous system-specific tumors in several laboratory animal species. In the present study, young male CD-1 mice were treated by i.p. injections of 0, 2, 8, or 32 mg/kg body weight N-ethyl,N-nitrosourea, twice a week for 3

Relationship between dopamine content and its secretion in PC12 cells as a function of cell growth.

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The PC12 cell line derived from a rat adrenal medullary tumor is known to synthesize dopamine and to release it in response to cholinergic agonists or depolarizing agents. In this report, we have studied the relationship between dopamine biosynthesis and its stimulus-induced secretion in PC12 cells

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