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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Adaptive immune response-modifying and antimicrobial properties of Andrographis paniculata and andrographolide

Xu, Youhong January 2009 (has links)
Andrographis paniculata (AP) is a traditional herbal medicine which is widely used for the treatment of many diseases in Asia. Recently, various biological activities of AP extract or andrographolide (AND), such as immunostimulatory activity, anti-inflammatoryeffect, cytokine induction or deduction, a potential cancer therapeutic agent and T cell activation suppression, have been reported. However the potential ofAP extract or AND to stimulate the specific or adaptive immune response using microbial vaccines has not been determined. In this project, AND has been purifiedfrom AP and its identity confirmed by the melting point, colour test, TLC, UV absorption spectrum, ESI-MS and H-NMR. An aqueous and two ethanolic extracts ofAndrographis paniculata and AND, an active principle of Andrographis paniculata, were investigated for their antimicrobial activity against nine bacterial species in vitro using the disc diffusion method. It was discovered that neither the aqueous extract nor AND were bacteriostatic or bactericidal against S. typhimurium, E. coli, S. sonnei, S. aureus, P. aeruginosa, S. pneumoniae, S. pyogenes, L. pneumophila or B. pertussisbut the two ethanolic extracts of AP were bacteriostatic against L. pneumophila and B. pertussis. It was also observed that the ethanol extract of AP and AND stimulatedboth antibody and cell-mediated immunity (CMI) responses to a killed S. typhimurium vaccine. Mice were vaccinated with either one dose or two doses of killed S. typhimurium vaccine. They were fed two different quantities of an ethanol extract of AP or AND for 14 days in mice immunised with one dose of the vaccine, and for 28 days in mice immunised with two doses of vaccine, respectively. Both the extract and AND significantly increased the IgG antibody titres against S. typhimurium, with theincrease in antibody titres being statistically significant in the two dose vaccine group. Although not statistically significant, there was also a substantial increase in the IgG antibody titres in the one dose vaccine group. Splenocyte cultures from mice fromboth the immunisation groups treated with the extract or AND stimulated with the S. typhimurium lysate showed a significant increase in the production of IFN-γ in both14 and 28 day AP extract or AND treatment groups. The increase indicates the induction of a cell-mediated immune response. To confirm the immunomodulatory potential of AP extract and determine the immunomodulatory potential of AND, experiments were conducted using mouse salmonellosis as a model system. Mice were vaccinated with two doses of killed S. typhimurium vaccine by intraperitoneal(i/p) route and orally dosed with AP extract at 25 mg/kg bodyweight or AND at 4 mg/kg bodyweight for total 28 days, followed by oral challenge with virulent S. typhimurium. Both AP extract and AND substantially increased the survival rate by 50% after mice were challenged with 10 fold of a sublethal dose (1.5x10 6 cfu) of virulent S. typhimurium. They also promoted clearance of S. typhimurium from challenged mice by days 8 or 12 post-challenge with 1.5x10 cfu virulent S. typhimurium respectively. Sera IgG, IgA antibody titres against S. typhimurium and IFN-γ or IL-2 were detected after the mice were challenged by the oral route with a sublethal dose (1.5x10 cfu) of virulent S. typhimurium for 12 days. It was thus concluded that both Andrographis paniculata and AND not only elicited both humoral and cell-mediated immune responses in the mouse model, but also increasedthe protective efficacy against salmonellosis on mice vaccinated with inactivated S. typhimurium. Therefore the ability of Andrographis paniculata and AND to promoteacquired immunity, particularly in inducing CMI may be important in protection against intracellular pathogen infection.
2

Studies on Andrographis paniculata (Burm. f.) Nees (HDM 15) A Medicinal Native Plant of Brunei Darussalam

Chua, Kui Hong, kuihongchua@hotmail.com January 2007 (has links)
Ethno botanical surveys have revealed that Brunei Darussalam has a rich source of tropical medicinal plants. As 80% of the country's land is covered by tropical rainforest, Brunei Darussalam may have some medicinal plants with unique characteristics of secondary metabolites. Some plants such as Catharanthus roseus (L.) G. Don and Eurycoma longifolia Jack have long been used by the local communities to treat various disease conditions. However, no research has been done in terms of the constituents or biological activities of the Brunei Darussalam medicinal plants. We have investigated the genetic variability diversity and pharmacological actions of Andrographis paniculata (Burm.f.) Nees [1] also known as Daun Pahit or Chuan Xin Lian or King of Bitters by an interdisciplinary approach, involving DNA-based RAPD and RFLP analyses, HPLC-based chemical analysis as well as cell culture and tissue-based bioassays. We have demonstrated that Andrographis paniculata extr acts exhibited a range of actions including antioxidant, anti-allergies, anti-inflammatory and anti-cancer effects. Some of the pharmacological actions of Andrographis paniculata are co-related with their active constituents Andrographolide (A) and Dehydroandrographolide (D). The study is valued not only in obtaining experimental evidence for supporting traditional use of native medicinal plants but also in establishing a platform for studying other medicinal plants in Brunei Darussalam.
3

Effects of Andrographis paniculata (Burm.F.) Nees on performance, mortality and coccidiosis in broiler chickens

Tipakorn, Naiyana 06 May 2002 (has links)
No description available.
4

Traditionellt växtbaserat läkemedel innehållande Tanacetum parthenium som förebyggande behandling av migrän : Reducerar behandling med kosttillskott och växtbaserat läkemedel antalet dagar med migrän? / Traditional herbal medicine containing Tanacetum parthenium as a preventive treatment of migraine : Do treatment with supplements and herbal medicines reduce the number of days with migraine?

Cao Dang, Yenline January 2022 (has links)
Bakgrund: Migrän är en sjukdom som orsakar huvudvärksanfall i kombination med illamående och hypersensitivitet. Det är inte helt kartlagt hur migrän uppstår men i genomförda studier har det bl.a. gått att observera en aktivering och sensitisering av det trigeminovaskulära systemet i hjärnan samt en frisättning av inflammatoriska mediatorer och förändrade serotoninnivåer i samband med migrän. Ärftlighet och exponering av olika läkemedel och mat är faktorer som kan öka risken för att drabbas av migrän. Akut intag och överanvändning av smärtlindrande som analgetika och paracetamol kan leda till läkemedelsutlöst huvudvärk. Därför behövs profylaktiska behandlingar studeras för att minska intag av akut smärtlindrande läkemedel men även för att minska lidandet vid migränanfall. Intresset för det växtbaserade läkemedlet Tanacetum parthenium i olika kombinationer tillsammans med tillskott som riboflavin, koenzym Q10, magnesium och 5- hydroxytrypofan har ökat på grund av dess låga biverkningsgrad (Aurastop®, Antemig®). Kombinationen av dessa ämnen fungerar förebyggande vid migrän genom att bl.a. hämma frisättning av inflammatoriska mediatorer och öka syreupptagningsförmågan samt hämma andra cellulära mekanismer som tros leda till uppkomsten av migrän. Även växten Andrographis paniculata ingår i vissa kombinationer vid behandling av migrän (Partena®). Syfte: Syftet med litteraturarbetet var att undersöka om det växtbaserade läkemedlet som innehåller T. parthenium i olika kombinationer tillsammans med riboflavin, koenzym Q10, magnesium, 5- hydroxytrypofan och A. paniculata var effektivt och säkert som förebyggande behandling vid migrän. Metod: Litteratursökningar gjordes i databasen PubMed. Sökorden ”Tanacetum parthenium migraine” och ”feverfew migraine” användes varpå filtrering gjordes med hjälp av urvalskriterier. De kriterier som tillämpades var att det skulle var max 10 år gamla RCT-studier med samma primära utfallsvariabel. På grund av brist på studier med samma primära variabel togs filtreringen på RCT-studier bort. Resultatet av sökningen blev då tre observationsstudier i PubMed och en studie från databasen Scientific research. Studierna hämtades för granskning och sammanställning. Resultat: Samtliga observationsstudier med saknad kontroll kort visade på en reducering av antal migrändagar efter behandling med T. parthenium i olika kombinationer. En del studier undersökte även intag av analgetika och intensitet av smärta innan och efter behandling. Där kunde även reducering av symtom och medicinering observeras efter behandling. Frekvensen av biverkingarna som uppstod i samband med behandling av T. parthenium i kombination med tillskotten var låga. Biverkningarna som förekom var diarré och magbesvär. Slutsats: T. parthenium i kombination med tillskotten riboflavin, koenzym Q10, magnesium, 5- hydroxytrypofan och A. paniculata är säkra och effektiva att använda som förebyggande behandling vid migrän. Vidare bör större RCT-studier göras för att kunna fastställa dess effekt.

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