Artemisininan innovative cornerstone for antimalaria therapy 성균관대학교 약학대학 천연물약품화학연구실 석박통합7기 김충섭 Contents Ⅰ About malaria Ⅱ From Artemisia annua to artemisinin and Coartem® III Market development through supply chain enlargement of A. annua Ⅳ Market development through supply chain enlargement of artemisinin Ⅰ About malaria 1. Symptoms & Infections 2. Epidemiology & Economic effects 3. Research 4. Prevention 5. Treatment 센터의 필요성 About malaria Ⅰ. About malaria Epidemiology Symptoms - Often in Africa - 500 million infection/year - 1 children/30 sec dies - Flu-like symptoms - High-fever, intermittent fever - Coma, death Economic effects Infections - USD 12 billion/year - No economic development - No tourism - Blood parasite Plasmodium - Anopheles mosquitoes Prevention Research - About infection cycle and vector control - Four Nobel prizes (1902, 04, 27, 48) Malaria - Insecticide-treated bed nets - Indoor Residual Spraying - Treat mosquitoes’ breeding areas with insecticides Treatment - Artemisinin-based Combination Therapies (ACT) - ‘Roll Back Malaria’ (RBM) by WHO, IRBD, UNDP, and UNICEF - Global Fund to Fight AIDS, Tuberculosis and Malaria (GFATM) Ⅱ From Artemisia annua to artemisinin and Coartem® 1. Antimalarial activity of Qinghao (A. annua L.) 2. Artemisinin from A. annua L. 3. Congeners of artemisinin 4. Development of ACT – Coartem® Ⅱ. From Artemisia annua to 1. Antimalarial activity of Qinghao (A. annua L.) Drug resistance Screening (1970s) 40,000 compounds and extracts screened in China Sulphadoxinepyrimethamine, Mefloquine developed (1950s) Drug resistance to chloroquine (Vietnam War) Soldiers infected (1960s) Malaria out of control artemisinin and Coartem Qinghao (Artemisia annua L., 개똥쑥) Hemorrhoids (168 BC) Fever (300s AD) Remedies Qinghao (Yin) + Internal heat (Yang) for Intermittent fever (1596 AD) Ⅱ. From Artemisia annua to 2. Artemisinin from A. annua L. artemisinin and Coartem Structure elucidation - NMR, MS and IR - Sesquiterpene lactone - C15H22O5 - X-ray crystallography - 1,2,4-trioxane ring (activity) Artemisia annua L. Amounts - ↑Leaves, small green stems, Essential oils Artemisinin Arteannuin Qinghaosu buds, flowers and seeds - ↓Stems, roots Clinical trials - Parasite decreased 95% in 16h (chloroquine: 40h) Sesquiterpenes - Effective in resistant spp. and cerebral form 2. Artemisinin from A. annua L. Ⅱ. From Artemisia annua to artemisinin and Coartem (from hemoglobin) SERCA: sarco-endoplasmic reticulum Ca2+-ATPase Nat. Chem. Biol. 3, 408-414 (2007) Ⅱ. From Artemisia annua to 3. Congeners of artemisinin artemisinin and Coartem® Total syntheses - First reported in 1983 - Not commercially viable Characteristics - Thermally stable (~150℃) - Poorly soluble in water and oil - Peroxide: essential for activity Dihydroartemisinin - More potent - Solubility in water ↓ - Stability ↓ Arteether - Soluble in oil - Available by I.M. Artemether - Soluble in oil - Available by I.M. - Short t1/2 Sodium artesunate - Soluble in water - Available by I.V. - Short t1/2 OZ277 (RBx11160) - More potent Long lasting Structurally simple Scale-up Reach market in 2009 (with piperaquine) Ⅱ. From Artemisia annua to 3. Congeners of artemisinin artemisinin and Coartem® Total syntheses - First reported in 1983 - Not commercially viable Characteristics - Thermally stable (~150℃) - Poorly soluble in water and oil - Peroxide: essential for activity - Approved as new malarial drugs in China (1986-1987) - Added to Essential Medicines List (1997, 2000) Artemether - Soluble in oil - Available by I.M. - Short t1/2 Sodium artesunate - Soluble in water - Available by I.V. - Short t1/2 OZ277 (RBx11160) - More potent Long lasting Structurally simple Scale-up Reach market in 2009 (with piperaquine) 4. Development of ACT – Drug resistance to available agents Combination therapy - Successful cure rates in other cases Ⅱ. From Artemisia annua to Coartem® artemisinin and Coartem® Combination in antimalaria therapy - Chlorproguanil-dapsone (LapDap) Dihydroartemisinin/piperaquine (DHA/PPQ) Artesunate-amodiaquine (AS-AQ) Artesunate-mefloquine (AS-S/P) Artesunate/ayronaridine (AS/PRN) Coartem® (Artemether/lumefantrine) - Only pre-qualified & fixed dose ACT - Cure rates 95 % - Effective on multidrug resistance - Registered in 81 countries - 100 million treatments Artemether Lumefantrine Ⅲ Market development through supply chain enlargement of A. annua 1. Major challenge in establishing a supply chain 2. Market situation for A. Annua 3. Plantation efforts to meet market demands 4. Geographical split of the supply market 5. Efforts to improve A. annua biomass 1. Major challenge in establishing a supply chain Ⅲ. Market development through supply chain enlargement of A. annua Market development Major challenge • Time needed for season • Weather conditions - Planting - Cultivating - Harvesting - Meteorological impacts • Damage by insects • Supply and demand - Oversupply → price ↓ → business less attractive → production reduced Ⅲ. Market development through supply chain enlargement of A. annua 2. Market situation for A. annua In 2001 • African countries needed ACTs • Exceed supply capacity Coartem® launched Until 2003 Sufficient amounts of A. annua Market complexity↑ In 2004 Unexpected demand for artemisinin - Harvest earlier → artemisinin content↓ - Unsuitable storage → loss of biomass - Extraction, purification x → poor quality Whole supply chain had to built up Ⅲ. Market development through supply chain enlargement of A. annua 3. Plantation efforts to meet market demands Local governments Planning – hardly possible - How Communities many kg of biomass may be harvested per hectare? - What would be the artemisinin content Mutual agreement achieved with high yield seeds on larger plantations? - No experience of how the huge volumes Farmers of biomass may be dried and processed Table 1. Demand planning for A. annua and artemisinin in 2004 Year Coartem Artemisinin required [kg] Artemisinin Amount of planned for [kg] biomass [kg] Required area [hectares] Remarks 2003 1.3 750 750 147,000 53 oversupply 2004 4.4 2,500 2,500 496,000 180 oversupply 2005 30 17,000 17,000 3,382,000 1,230 Max. market could supply 2006 120 68,000 124,000 25,000,000 9,000 2007 200 113,000 150,000 30,100,000 11,000 2008 200 113,000 150,000 30,100,000 11,000 Ⅲ. Market development through supply chain enlargement of A. annua 3. Plantation efforts to meet market demands Novartis Contract Extraction company Communities Economic effects Timely delivery Seeds Seminars Biomass managers Meet market demands Farmers Ⅲ. Market development through supply chain enlargement of A. annua 4. Geographical split of the supply market Novartis 중국 Reduced agricultural risks 동아프리카 베트남 - Tanzania, Kenya, Uganda - Long experience with cultivation - Larger areas up to 200 hectares were planted - Irrigation on a large scale Ⅲ. Market development through supply chain enlargement of A. annua 5. Efforts to improve A. annua biomass High yield seeds (being investigated) Plantation area ↓ Drying efforts ↓ Artemisinin content ↑ Transportation Reduced time & cost Storage Ⅳ Market development through supply chain enlargement of artemisinin 1. Capacity for extraction and purification: in 2003 2. Major side products (Waxes) 3. Other side products 4. Extraction and purification 2004 onwards 1. Capacity for extraction and purification: in 2003 Ⅳ. Market development through supply chain enlargement of artemisinin Reflux several times Dried leaves Hexane or Petroleum ether Solvent – recovered Silica gel – partially regenerate Without automation EtOAc Artemisinin Charcoal & recrystallization Lipophilic substances (waxes) Ⅳ. Market development through supply chain enlargement of artemisinin 2. Major side products (Waxes) Waxes Identification - Mixture of longchain apolar lipids - Microscope: difference between the samples with or without waxes can be observed - Form a protective coating on plant leaves and fruits - IR spectroscopy: quantification by calibration - In animals, algae, fungi and bacteria - Not chemically homogeneous group - Water-resistant - In crude artemisinin: aliphatic alcohols and hydrocarbons - GC-FID: quatification Ⅳ. Market development through supply chain enlargement of artemisinin 3. Other side products A. annua HPLC-UV-MS More than 150 natural products HPLC-UV -Extinction coefficients (흡광계수) 4. Extraction and purification 2004 onwards Analytical method (TLC-FID) - Accurate - Quickly - Results with and automated evaluation Ⅳ. Market development through supply chain enlargement of artemisinin Purification method - Chromatography → crystallization . Waxes co-precipitating . Plugging during filtrations . With major related substance (dehydro-artemisinin) Synthetic production - Semi-synthesis (artemisinic acid → artemisinnin) - Cost non-competitive