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Effects on interstitial glutathione, cysteine and 5-S-cysteinyldopa of buthionine sulphoximine in human melanoma transplants
Linköpings universitet, Institutionen för klinisk och experimentell medicin, Neurologi. Linköpings universitet, Hälsouniversitetet.
Linköpings universitet, Institutionen för klinisk och experimentell medicin, Klinisk kemi. Linköpings universitet, Hälsouniversitetet.
Linköpings universitet, Institutionen för klinisk och experimentell medicin, Klinisk kemi. Linköpings universitet, Hälsouniversitetet.
Linköpings universitet, Institutionen för klinisk och experimentell medicin, Klinisk kemi. Linköpings universitet, Hälsouniversitetet.
1997 (engelsk)Inngår i: Melanoma research, ISSN 0960-8931, E-ISSN 1473-5636, Vol. 7, nr 4, s. 322.-328Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Using microdialysis of human melanoma transplants in athymic mice we have shown that interstitial glutathione levels decreased during treatment with buthionine sulphoximine (BSO) and recovered after cessation of treatment. The cysteine concentrations also decreased, while 5-S-cysteinyldopa tended to increase during BSO treatment. Restoration of the glutathione levels was not seen after either N-acetylcysteine (NAC) or L-2-oxothiazolidine-4-carboxylate (OTC) injections, given on the third day of BSO treatment. These results were to be expected since NAC and OTC were given during the BSO treatment, and BSO is a specific and potent inhibitor of glutathione synthesis. Cysteine levels, however, increased after the NAC injection but remained unaltered after the OTC injection, while 5-S-cysteinyldopa remained unaltered after both the NAC and the OTC injections.

sted, utgiver, år, opplag, sider
1997. Vol. 7, nr 4, s. 322.-328
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-13526OAI: oai:DiVA.org:liu-13526DiVA, id: diva2:20910
Tilgjengelig fra: 1999-05-21 Laget: 1999-05-21 Sist oppdatert: 2018-01-12bibliografisk kontrollert
Inngår i avhandling
1. Microdialysis as a Tool in Studies of L-Dopa and Metabolites in Malignant Melanoma and Parkinson’s Disease
Åpne denne publikasjonen i ny fane eller vindu >>Microdialysis as a Tool in Studies of L-Dopa and Metabolites in Malignant Melanoma and Parkinson’s Disease
1999 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

A model with human melanoma xenografts transplanted to athymic mice has been adopted for in vivo studies of 5-S-cysteinyldopa (an intermediate pigment metabolite), glutathione, and cysteine. L-Dopa is an intermediate metabolite in pigment formation and is also important in the treatment of Parkinson's disease, and therefore 1 have also studied the pharmacokinetics of this compound.

We were first to describe in vivo microdialysis in melanoma tissue and showed that dialysis membranes of cuprophane or polyamide are suitable for studies of interstitial 5-S-cysteinyldopa and selected thiols. Analytical procedures were also improved for quantitation of 5-S-cysteinyldopa, L-dopa, glutathione, cysteine, and N-acetylcysteine (NAC). In the melanoma xenografts the interstitial concentration of 5-S-cysteinyldopa reflected the high intracellular production of this intermediate metabolite. For in vivo manipulation of glutathione in the melanoma tissue we gave intraperitoneal injection of buthionine sulphoximine to the animals and thus reduced the glutathione concentrations substantially. We showed that restitution of glutathione in melanoma tissue occurs spontaneously and is not much improved by treatment with the cysteine deliverers NAC and L-2-oxothiazolidine-4-carboxylate (OTC). 5-S-Cysteinyldopa was not substantially affected by great variations in glutathione concentrations. Transport of NAC from intraperitoneal injection to melanoma tissue occurred rapidly and deacetylation to cysteine in vivo could be detected soon after NAC injection. In vivo formation of cysteine was slower from OTC than from NAC.

Pharmacokinetic studies of L-dopa in human subjects indicated a slight to moderate protein binding. Plasma free L-dopa had similar elimination T½ as interstitial L-dopa, but in some cases the elimination of total L-dopa was slower. Difficulties in intestinal absorption of L-dopa were revealed by microdialysis in blood and subcutaneous tissue. Studies showed that this was due to delayed emptying of the stomach. L-Dopa intake increased 5-S-cysteinyldopa concentrations in blood within 30 min in patients with Parkinson's disease and a history of melanoma. No melanoma activation occurred during long-term treatment with L-dopa.

Microdialysis is thus a safe and easily applied method for in vivo studies of both pigment metabolites from human melanoma tissue transplanted to nude mice and for pharmacokinetic studies of L-dopa.

sted, utgiver, år, opplag, sider
Linköping: Linköping University Electronic Press, 1999. s. 51
Serie
Linköping University Medical Dissertations, ISSN 0345-0082 ; 588
Emneord
Microdialysis, L-Dopa, Malignant Melanoma, Parkinson's Disease, in vivo
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-5009 (URN)91-7219-332-8 (ISBN)
Disputas
1999-04-09, Berzeliussalen, Hälsouniversitetet, Campus US, Linköpings universitet, Linköping, 13:00 (engelsk)
Opponent
Veileder
Merknad

On the day of the public defence the status of the articles IV, V and VI was: Submitted.

Tilgjengelig fra: 1999-05-21 Laget: 1999-05-21 Sist oppdatert: 2018-01-12bibliografisk kontrollert

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