quinine and cryptolepine

quinine has been researched along with cryptolepine* in 2 studies

Other Studies

2 other study(ies) available for quinine and cryptolepine

Article	Year
Isoneocryptolepine, a synthetic indoloquinoline alkaloid, as an antiplasmodial lead compound. Journal of natural products, 2005, Volume: 68, Issue:5 The antiprotozoal activities of three naturally occurring isomeric indoloquinoline alkaloids, i.e., cryptolepine (1), neocryptolepine (2), and isocryptolepine (3), and two dimeric indoloquinoline alkaloids, cryptoquindoline (6) and biscryptolepine (7), originally obtained from the plant Cryptolepis sanguinolenta, were compared with those of a new synthetic indoloquinoline isomer, isoneocryptolepine (4), and a quaternary derivative, N-methyl-isocryptolepinium iodide (5). The latter compounds showed a high antiplasmodial activity against the chloroquine-resistant Plasmodium falciparum strain K1 (IC50 of 0.23 +/- 0.04 and 0.017 +/- 0.004 microM, respectively), while the cytotoxicity (L6 cells) was 4.32 +/- 0.04 and 12.7 +/- 2.0 microM, respectively. Isoneocryptolepine (4) was found to act as an inhibitor of beta-hematin formation and as a DNA-intercalating agent. Topics: Alkaloids; Animals; Antimalarials; Apocynaceae; Indole Alkaloids; Indoles; Molecular Structure; Plasmodium falciparum; Quinolines; Structure-Activity Relationship	2005
In vitro and in vivo antiplasmodial activity of cryptolepine and related alkaloids from Cryptolepis sanguinolenta. Journal of natural products, 1997, Volume: 60, Issue:7 Three different extracts and four alkaloids from the root bark of Cryptolepis sanguinolenta have been assessed in vitro against Plasmodium falciparum D-6 (chloroquine-sensitive strain), K-1, and W-2 (chloroquine-resistant strains). Cryptolepine (1) and its hydrochloride (2), 11-hydroxycryptolepine (3), and neocryptolepine (5) showed a strong antiplasmodial activity against P. falciparum chloroquine-resistant strains. Quindoline (4) was less active. The highest activity was obtained with compound 1. In vivo tests on infected mice showed that cryptolepine (1), when tested as its hydrochloride (2), exhibited a significant chemosuppressive effect against Plasmodium berghei yoelii and Plasmodium berghei, berghei, while 1 had the same effect against P. berghei yoelii only. Compounds 3 and 4 did not show activity in this in vivo test system. Topics: Alkaloids; Animals; Antimalarials; Humans; In Vitro Techniques; Indole Alkaloids; Indoles; Mice; Microbial Sensitivity Tests; Plants, Medicinal; Plasmodium berghei; Plasmodium falciparum; Quinolines; Spectrum Analysis	1997

Article

Year

Isoneocryptolepine, a synthetic indoloquinoline alkaloid, as an antiplasmodial lead compound.

Journal of natural products, 2005, Volume: 68, Issue:5

The antiprotozoal activities of three naturally occurring isomeric indoloquinoline alkaloids, i.e., cryptolepine (1), neocryptolepine (2), and isocryptolepine (3), and two dimeric indoloquinoline alkaloids, cryptoquindoline (6) and biscryptolepine (7), originally obtained from the plant Cryptolepis sanguinolenta, were compared with those of a new synthetic indoloquinoline isomer, isoneocryptolepine (4), and a quaternary derivative, N-methyl-isocryptolepinium iodide (5). The latter compounds showed a high antiplasmodial activity against the chloroquine-resistant Plasmodium falciparum strain K1 (IC50 of 0.23 +/- 0.04 and 0.017 +/- 0.004 microM, respectively), while the cytotoxicity (L6 cells) was 4.32 +/- 0.04 and 12.7 +/- 2.0 microM, respectively. Isoneocryptolepine (4) was found to act as an inhibitor of beta-hematin formation and as a DNA-intercalating agent.

Topics: Alkaloids; Animals; Antimalarials; Apocynaceae; Indole Alkaloids; Indoles; Molecular Structure; Plasmodium falciparum; Quinolines; Structure-Activity Relationship

2005

In vitro and in vivo antiplasmodial activity of cryptolepine and related alkaloids from Cryptolepis sanguinolenta.

Journal of natural products, 1997, Volume: 60, Issue:7

Three different extracts and four alkaloids from the root bark of Cryptolepis sanguinolenta have been assessed in vitro against Plasmodium falciparum D-6 (chloroquine-sensitive strain), K-1, and W-2 (chloroquine-resistant strains). Cryptolepine (1) and its hydrochloride (2), 11-hydroxycryptolepine (3), and neocryptolepine (5) showed a strong antiplasmodial activity against P. falciparum chloroquine-resistant strains. Quindoline (4) was less active. The highest activity was obtained with compound 1. In vivo tests on infected mice showed that cryptolepine (1), when tested as its hydrochloride (2), exhibited a significant chemosuppressive effect against Plasmodium berghei yoelii and Plasmodium berghei, berghei, while 1 had the same effect against P. berghei yoelii only. Compounds 3 and 4 did not show activity in this in vivo test system.

Topics: Alkaloids; Animals; Antimalarials; Humans; In Vitro Techniques; Indole Alkaloids; Indoles; Mice; Microbial Sensitivity Tests; Plants, Medicinal; Plasmodium berghei; Plasmodium falciparum; Quinolines; Spectrum Analysis

1997