title: Inhibition of human leukocyte function, alanyl aminopeptidase (APN, CD13) and dipeptidylpeptidase IV (DP IV, CD26) enzymatic activities by aqueous extracts of Cistus incanus L. ssp. incanus.
abstract: Short-boiled aqueous extract from leaves of Cistus incanus L. ssp. incanus (CIT) dose-dependently inhibit the enzymatic activities of both alanyl aminopeptidase (APN, CD13, EC 3.4.11.2) and dipeptidylpeptidase IV (DP IV, CD26, EC 3.4.14.5). This inhibition is not reversible and very likely results from a covalent binding of reactive compounds to the enzymes. Furthermore, we show that aqueous CIT extracts decrease the DNA-synthesis of human T cells and mononuclear cells and inhibit the proliferation rate of the human T cell line KARPAS-299 in a dose-dependent manner. Data are presented suggesting that the antiproliferative effects of CIT extracts are due to their strong cytotoxic activity.
authors.affiliation: Institute of Experimental Internal Medicine, Center of Internal Medicine, Otto-von-Guericke University Magdeburg, Leipziger Str. 44, D-39120 Magdeburg, Germany. uwe.lendeckel@medizin.uni-magdeburg.de
authors.forename: Uwe
authors.initials: U
authors.lastname: Lendeckel
authors.forename: Marco
authors.initials: M
authors.lastname: Arndt
authors.forename: Carmen
authors.initials: C
authors.lastname: Wolke
authors.forename: Dirk
authors.initials: D
authors.lastname: Reinhold
authors.forename: Thilo
authors.initials: T
authors.lastname: Kähne
authors.forename: Siegfried
authors.initials: S
authors.lastname: Ansorge
mesh_terms: D000818:Animals; D018826:CD13 Antigens / Q000037:antagonists & inhibitors* / Q000378:metabolism*; D002478:Cells, Cultured; D029758:Cistus / Q000737:chemistry; D018819:Dipeptidyl Peptidase 4 / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D004353:Drug Evaluation, Preclinical / Q000379:methods / Q000706:statistics & numerical data; D006801:Humans; D007371:Interferon-gamma / Q000378:metabolism; D007375:Interleukin-1 / Q000378:metabolism; D007963:Leukocytes, Mononuclear / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D008970:Molecular Weight; D016716:PC12 Cells; D010936:Plant Extracts / Q000494:pharmacology / Q000627:therapeutic use; D018515:Plant Leaves / Q000737:chemistry; D051381:Rats; D013601:T-Lymphocytes / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism
chemical_list: D007375:Interleukin-1; D010936:Plant Extracts; D007371:Interferon-gamma; D018826:CD13 Antigens; D018819:Dipeptidyl Peptidase 4