藥理學總論英文睢大員

1、藥理學總論英文睢大員 What is Pharmacology? Chapter 1 Introduction basic medicine Pharmacologypharmacy medicine clinic medicine - drug broadly defined as any chemical that affect living processes - useful in prevention, diagnosis, treatment of diseasesChapter 1 IntroductionWhat is a drug?Sources of DrugsAnimal

2、sPlants MineralsSyntheticsMicrobesGenetic engineering drugs基因工程藥物過程示意圖從細胞中分離出DNA限制酶截取DNA片斷分離大腸桿菌中的質(zhì)粒 DNA重組用重組質(zhì)粒轉化大腸桿菌培養(yǎng)大腸桿菌克隆大量基因 drugTask of PharmacologymedicinepharamacodynamicspharmacokineticsbodyDevelopment of Pharmacology上古時代公元前1世紀明代（公元1596年）近代藥理學的發(fā)展迄今Pharmacological research of new drugs pharm

3、acodynamics general pharmacology pharmacokinetics toxicitology 1、 preclinical testsafety pharmacologyPharmacological research of new drugs period : 2030 case period : 200300 case period : 400 case period : clinical trial2000 case2、 clinical pharmacological trial Section 1 Basic action of drugsChapte

4、r 2 Pharmacodynamicsstimulators or excitantsinhibitors or depressantsstimulation or excitation depression or inhibitiondrug action drug effect local action general action Chapter 2 Pharmacodynamicstherapeutic effect advers drug reactionselectivity dualismChapter 2 Pharmacodynamics Therapeutic effect

5、 etiological treatment symptomatic treatment Chapter 2 PharmacodynamicsAdvers drug reaction side action econdary reactiontoxic reactionacute toxcitychronic toxcitycarcinogenesisteratogenesismutagenesisallergic reactionresidual effect withdrawal reaction Section 2 Receptive theoryChapter 2 Pharmacody

6、namicsLigand (L)Effect (E)Receptor (R)Chapter 2 Pharmacodynamicsreceptor typechannel-linkd receptorsG-protein coupled receptorstyrosine kinase-linked receptorsregulate gene transcription receptors激動藥結合區(qū)域膜外膜內(nèi)激動藥結合區(qū)域 Ligand-gated ion channel receptorsG蛋白偶聯(lián)CN激動藥結合區(qū)域膜外膜內(nèi) G-protein coupled recptors激動藥結合區(qū)

7、域膜外膜內(nèi)催化結構區(qū)域 Tyrosine-protein kinase receptor激動藥結合區(qū)域膜外膜內(nèi)DNA結合區(qū)域轉錄激活區(qū)域載體 + 藥物載體-藥物復合物載體 + 藥物載體 Intracellular receptorsChapter 2 Pharmacodynamicsreceptorregulationdown regulationup regulationhomospecific regulationheterospecific regulationChapter 2 PharmacodynamicsLRintrinsic activityaffinityEChapter 2

8、 Pharmacodynamicsreceptor agonistfull agonistpartial agonistreceptor antagonist full antagonist partial antagonistcompetitive antagonistnon-competitive antagonistnon-competitive antagonistdrug action and signai transductionChapter 2 Pharmacodynamicsgraded responsequantal response Dose-response relat

9、ionshipChapter 2 Pharmacodynamicsminimum effective dose (threshold dose)maximum effect (Emax)maximal dose (Max-D)median effective dose (ED50) minimum toxic dose (Tmin)median lethal dose (LD50)Dose-response relationshipefficacypotencyDose-response relationship EmaxED50efficacypotency100%50%threshold

10、doseMax-DTminDose Response CurveEmaxEmaxChapter 2 Pharmacodynamics LD50therapeutic index (TI) = ED50 LD5safety index (SI) = ED95 (LD1 - ED99)safety margin (SM) = 100% ED99safety evaluation of drugsChapter 3 Pharmacokinetics absorptiondistributionmetabolism (biotransformation) excretionSection 1 phys

11、iological disposition of drugsPharmacokinetic PhaseeliminationAbsorptiondistribution excretiondrug transport through membranesmetabolismbiotransformation Cell membrane 1) GI epithelial cells 2) vascular endothelium 3) blood brain barrier (BBB) 4) subcellular membranes 一、Drug transport across membran

12、es1234GI epithelial cellsVascular endotheliumBlood brain barrier(BBB)Subcellular membranesA. simple diffusion1. Passive transportB. facilitated diffusionC. aqueous diffusionacross membraneof lipidacross aqueous channelcarrier transportoutsideinside1. Passive transport simple diffusion R = DA (C1 - C

13、2) / XR: diffusion rate D: diffusion constantA: area of membrane(C1-C2): concentration gradient of drugsX: thickness of membrane For a weak acid ka HA H+ + A- H+ A- ka = HA ka : dissociation constant pH = - log concentration H+ - log Ka is pKa For a weak acid A-pKa = pH -log HA A-pH - pKa = log HA10

14、 pH - pKa = A- / HAFor a weak base ka H+B BH+ H+ + B Ka = BH+ BH+ pKa pH = log B10 pka pH = BH+ / B For a weak acid unionized pKa = pH + log ionized 10 PH-pka = ionized / unionizedFor a weak base ionized pKa = pH + log unionized 10pka-pH= ionized / unionized If A-= HA or B=BH+ - pKa = pH - a substan

15、ce is half ionized and half nonionized Must be careful you must know pKa A-pH - pKa = log HA BH+or pKa pH = log B 2. active transport Examle : Na+-K+ ATPase 3. cytosis pinocytosisexocytosis 1. Absorption the movement of a drug from its site of administration into the bloodstream二、drug process in bod

16、yBloodstreamdrugdrug1) First-pass effectinfluencing factor the first pass effect can be avoided by sublingual rectum inhalation im sc GI hepatic portal vein liver vena cava 2) Bioavailability fraction of an administered drug that reaches the systemic circulation for IV, Minimum effective concentrati

17、on 2. DistributionBloodstreamdrugdrug enters the extracellular fluids and tissues of the bodydrugcell 1) binding of drug by plasma proteinsinfluencing factor2) bloodstream of organ3) affinity of tissue4) blood brain barrier5) placental barrier Apparent Volume of Distribution (Vd)Vd is hypothetical v

18、olume Vd = A / C 3. Metabolism two phases oxidationsreductionshydrolyses the first phase conjugationsthe second phaseHepatic microsomal enzymesenzyme inhibitorenzyme inducermixed function oxidases 4. Excretion excretion of kidneysexcretion of bileexcretion of mammary gland Hepatoenteral circulation

19、liver-bilegall bladder duodenumexcrete 4. Excretion 消除transport and transformation of drugs Section 2 Basic concept of pharmacokineticsA. Time-concentration curvethreshold dose CmaxTpeakTCmin B. Half Life (t1/2) first order kinetics t1/2 zero order kinetics t1/2 C. Compartment model absoption elimin

20、ationDrug one-compartment modeltwo-compartment model drug central compartment peripheralcompartmentabsoptionelimination D. Clearance (CL)CL = Vd . K or1/20210123456Steady stateconCss.maxCss.min7 E. Steady state concentration (Css) 血藥濃度100200300802460002468100200300時間（半衰期）10020030002460ABC8MTCMEC三種不同

21、給藥方案對穩(wěn)態(tài)濃度的影響A. 縮短給藥時間 B. 增加給藥劑量 C. 負荷量給藥F. Drug elimination rate dc/dt = -KCn C: concentration of the drug K: elimination rate constantn=1 first order kinetics -dc/dt = KC1n=0 zero order kinetics -dc/dt = KC0 = VmaxFirst order kinetics: constant fraction of drug is eliminated per unit timeZero order

22、 kinetics : same quantity of drug is eliminated per unit timeRoutes of Drug Administrationcommon abbreviationspo = per os = oraliv = intravenous = into the veinim = intramuscular = into the musclesc = subcutaneous = between the skin and muscleip = intraperitoneal = within the peritoneal cavityicv =

23、intracerebroventricular =directly into the ventricle of the brainChapter 4 Factors affecting effect of drugs age and sexmental and pathologic factorsindividual variation and genetics species variationSection 1 Factors about organism aspect age and sexage infants aged people age and sexsexmalefemalem

24、ental factor spirit and body diseasebody and spirit diseaseplacebo actions mental and pathologic factors mental and pathologic factorspathologic factordystrophyrenal inadequacyhepatic inadequacyindividual variation and genetic factorsindividual variationhypersensitive reactiontolerancehypersensitivityindividual variation and genetic factorsgenetic factors haemolyticus anemiamalig anemiamethemoglobinemiaspecies variationanimalrace Chapter 4 Factors affecting effect of d