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Titolo:
Caco-2 cells in culture synthesize and degrade dopamine and 5-hydroxytryptamine: A comparison with rat jejunal epithelial cells
Autore:
Vieira-Coelho, MA; Teixeira, VL; Guimaraes, JT; Serrao, MP; Soares-da-Silva, P;
Indirizzi:
Fac Med Porto, Inst Pharmacol & Therapeut, P-4200 Oporto, Portugal Fac MedPorto Oporto Portugal P-4200 Therapeut, P-4200 Oporto, Portugal
Titolo Testata:
LIFE SCIENCES
fascicolo: 1, volume: 64, anno: 1998,
pagine: 69 - 81
SICI:
0024-3205(19981127)64:1<69:CCICSA>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
AMINO-ACID DECARBOXYLASE; ANTAGONISTIC ACTIONS; RENAL DOPAMINE; LINE CACO-2; KIDNEY; DIFFERENTIATION;
Keywords:
Caco-2 cells; rat jejunal epithelial cells; dopamine; metabolism; 5-HT synthesis;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Soares-da-Silva, P Fac Med Porto, Inst Pharmacol & Therapeut, P-4200 Oporto, Portugal Fac Med Porto Oporto Portugal P-4200 Oporto, Portugal
Citazione:
M.A. Vieira-Coelho et al., "Caco-2 cells in culture synthesize and degrade dopamine and 5-hydroxytryptamine: A comparison with rat jejunal epithelial cells", LIFE SCI, 64(1), 1998, pp. 69-81

Abstract

To explore the usefulness of Caco-2 cells in the study of intestinal dopaminergic and 5-hydroxytryptaminergic physiology, we have undertaken the study of aromatic L-amino acid decarboxylase (AADC), catechol-O-methyltransferase (COMT) and type A and B monoamine oxidase (MAO-A and MAO-B) activities in these cells using specific substrates. The activity of these enzymes was also evaluated in isolated rat jejunal epithelial cells. The results showedthat V-max values (in nmol mg protein(-1) h(-1)) for AADC, using L-DOPA asthe substrate, in rat jejunal epithelial cells (127.3+/-11.4) were found to be 6-fold higher than in Caco-2 cells (22.5 +/- 2.6). However, K-m valuesin Caco-2 cells (1.24+/-0.37 mM) were similar to those observed in rat jejuanl epithelial cells (1.30+/-0.29 mM). Similar results were obtained when AADC activity was evaluated using L-5HTP as substrate; in rat jejunal epithelial cells V-max values (in nmol mg prot(-1) h(-1)) were found to be 5-fold that in Caco-2 cells (16.3+/-1.0 and 3.0+/-0.2, respectively), and K-m values in Caco-2 cells (0.23+/-0.08 mM) were again similar to those observed in rat intestinal epithelial cells (0.09+/-0.03 mM). Caco-2 cells were not able to O-methylate dopamine, in contrast to rat jejunal epithelial cells (V-max = 8.6 +/- 0.4 nmol mg protein(-1) h(-1); K-m = 516+/-57 mu M). V-max values (in nmol mg protein(-1) h(-1)) for type A and B MAO in Caco-2 cells (19.0+/-0.6 and 5.4+/-0.6, respectively) were found to be significantly lower (P<0.05) than those in rat jejunal epithelial cells (46.9+/-3.1 and 9.6+/-1.2, respectively); however, no significant differences in the K-m valueswere observed between Caco-2 and rat jejunal epithelial cells for both type A and B MAO. In conclusion, Caco-2 cells in culture are endowed with the synthetic and metabolic machinery needled to form and degrade DA and 5-HT, though, no COMT activity could be detected in these cells.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 23:01:35