isobutyric acid/cáncer

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Role of protein dissociation in the transport of acidic amino acids by the Ehrlich ascites tumor cell.

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The pH profile for the uptake of L-glutamic acid by the Ehrlich ascites tumor cell arises largely as a sum of the decline with falling pH of a slow, Na+-dependent uptake by System A, and an increasing uptake by Na+-independent System L. The latter maximizes at about pH 4.5, following approximately

[Comparative distribution study of 14C labeled amino acids, glucose-analogue and precursor of nuclei acid, as tumor seeking agents].

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As tumor-seeking agents, glucose analogues, natural amino acids, synthetic nonmetabolized amino acids, and precursor of nucleic acids, etc., labeled with positron emitter, such as 11C and 18F have been recently investigated. However, there are very few reports concerning comparative study of tumor

Pharmacokinetics of 3-[125I]iodo-alpha-methyl-L-tyrosine, a tumor imaging agent, after probenecid loading in mice implanted with colon cancer DLD-1 cells.

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BACKGROUND In order to improve tumor imaging, changes in the pharmacokinetics of 3-[123I]iodo-alpha-methyl-l-tyrosine ([123I]IMT), an artificial amino acid that exhibits high tumor accumulation, after probenecid (PBC) loading was studied in mice implanted with colon cancer DLD-1 cells using

3-O-methyl-6-18F-fluoro-L-dopa, a new tumor imaging agent: investigation of transport mechanism in vitro.

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(18)F-Labeled amino acids represent a promising class of imaging agents in tumors, particularly brain tumors. However, the determination of their potential to image peripheral tumors, possibly depending on individual transport characteristics, still remains an area of investigation. The present

Sequential change of capillary permeability in the rat brain after surgical removal of an experimental brain tumor.

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Experimental brain tumors were excised from rats for sequential observation of changes in local capillary permeability during the postsurgical period. Experimental brain tumor-bearing rats were prepared by stereotaxic transplantation of cultured tumor cells and the resultant tumor was delineated by

Bombesin analogs containing alpha-amino-isobutyric acid with potent anticancer activity.

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Six octapeptide bombesin (BN) analogs were synthesized by substituting alpha-aminoisobutyric acid (Aib), in place of Ala9 or Gly11, or both, in the [D-Phe6, desMet14]-BN (6-14) sequence: D-Phe6-Gln7-Trp8-Ala9-Val10-Gly11-His12-Leu13-NH2 (P0). Additionally, Leu13 was replaced with isoleucine in two

Influence of proliferative rates and A system substrate availability on proline transport in primary cell cultures of the R3230AC mammary tumor.

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Regulation of A system amino acid transport was studied in primary cultures of the R3230AC mammary adenocarcinoma. Higher rates of carrier-mediated Na+-dependent proline transport, vc, was decreased and was attributed to a two-fold decrease in Vmax and a two-fold increase in Km. When compared to

Transcellular transport of radioiodinated 3-iodo-alpha-methyl-L-tyrosine across monolayers of kidney epithelial cell line LLC-PK1.

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OBJECTIVE 3-[123I]iodo-alpha-methyl-L-tyrosine ([123I]IMT) is an imaging agent for amino acid transport. In order to obtain fundamental data related to tumor imaging with [123I]IMT and renal physiological accumulation of [123I]IMT, we investigated the transport characteristics of [125I]IMT in

Investigation of iodine-123-labelled amino acid derivatives for imaging cerebral gliomas: uptake in human glioma cells and evaluation in stereotactically implanted C6 glioma rats.

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In developing iodine-123-labelled amino acid derivatives for imaging cerebral gliomas by single-photon emission tomography (SPET), we compared p-[123I]iodo-L-phenylalanine (IPA), L-[123I]iodo-1,2,3,4-tetrahydro-7-hydroxyisoquinoline-3-carboxylic acid (ITIC) and L-3-[123I]iodo-alpha-methyltyrosine

Unique antitumour effects of L-2,4 diaminobutyric acid on cultured hepatoma cells.

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A single hepatoma cell line was grown in vitro and incubated with L-2,4 diaminobutyric acid (DAB), a non-metabolizable amino acid, under various conditions. The tumour cells were irreversibly damaged by incubation for 8 hours with 8 mmol/L of DAB. The tumour cell-destroying effect of DAB was dose-

Apple Polysaccharide inhibits microbial dysbiosis and chronic inflammation and modulates gut permeability in HFD-fed rats.

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The saying "An apple a day keeps the doctor away" has been known for over 150 years, and numerous studies have shown that apple consumption is closely associated with reduced risks of chronic diseases. It has been well accepted that dysbiosis is the reflection of various chronic diseases. Therefore,

Hydrocortisone induction of system A amino acid transport in human fibroblasts from normal dermis and keloid.

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The rate of proline transport increases when human dermal fibroblasts are grown in physiological levels of hydrocortisone. This response to hydrocortisone is significantly greater in fibroblasts derived from keloids, benign dermal tumors caused by an inherited abnormality in wound healing (Russell,

Synthetic modification of the 2-oxypropionic acid moiety in 2-{4-[(7-chloro-2-quinoxalinyl)oxy]phenoxy}propionic acid (XK469), and consequent antitumor effects. Part 4.

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The criteria for the activity of 2-{4-[(7-chloro-2-quinoxalinyl)oxy]phenoxy}propionic acid (XK469) and 2-{4-[(7-bromo-2-quinolinyl)oxy]phenoxy}propionic acid (SH80) against transplanted tumors in mice established in previous studies, require a (7-halo-2-quinoxalinoxy)- or a

Evaluation and comparison of short chain fatty acids composition in gut diseases.

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An altered (dysbiosis) and unhealthy status of the gut microbiota is usually responsible for a reduction of short chain fatty acids (SCFAs) concentration. SCFAs obtained from the carbohydrate fermentation processes are crucial in maintaining gut homeostasis and their determination in

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