Tlhahlobo ea Pharmacology ea Limolek'hule le Receptor
Thuto ea meriana ea limolek'hule ke lekala la thuto ea meriana le ithutang kamoo lithethefatsi li sebetsang kateng boemong ba limolek'hule—ho tloha likamanong tsa lithethefatsi le liprotheine tse reretsoeng, liphetoho tsa sebopeho sa li-receptor, ho kenya tšebetsong litsela tsa lipontšo tsa ka hare ho sele, le tšusumetso ea tsona ea ho qetela mosebetsing oa sele, lisele le lintho tse phelang. Mokhoa ona oa limolek'hule ke motheo oa nts'etsopele ea meriana ea sejoale-joale hobane o lumella bafuputsi ho rala metsoako e khethang haholoanyane, e sebetsang hantle le e sireletsehileng. E 'ngoe ea likhopolo tsa bohlokoa ka ho fetisisa sebakeng sena ke sepheo sa li-receptor, sebopeho sa limolek'hule (hangata protheine) seo moriana o se lemohang le ho se susumetsa, se fellang ka phello ea baeloji.
Mehopolo ea motheo ea lipheo tsa lithethefatsi
Thutong ea meriana ea limolek'hule, lentsoe "sepheo" le bolela karolo ea baeloji e sebelisanang ka ho toba le moriana. Lipheo e ka ba li-receptor tsa lera, li-enzyme, litsela tsa ion, li-transporter, kapa esita le li-nucleic acid. Leha ho le joalo, li-receptor li na le sebaka se khethehileng hobane meriana e mengata ea phekolo e etselitsoe ho fetola li-receptor, tse laolang puisano ea lisele ka lipontšo tsa lik'hemik'hale.
Ka kakaretso likamano pakeng tsa lithethefatsi le tse reretsoeng li ikhetha, empa ha se kamehla li ikhethang. Lithethefatsi tse ngata li na le lipheo tse fetang e le 'ngoe; sena se hlalosa litla-morao le melemo e meng. Ka hona, pharmacology ea limolek'hule e ithuta "'mapa oa tšebelisano" ea lithethefatsi ka botlalo - ho tloha ho kamano le khetho ho isa liphellong tsa ho kenya tšebetsong kapa ho thibela litsela tsa ho bontša matšoao.
Li-receptor e le setsi sa taolo ea karabelo ea lithethefatsi
Seamoheli ke protheine e kgonang ho lemoha ligand (mohlala, hormone, neurotransmitter, kapa sethethefatsi) le ho fetolela setswamao hore e be letshwao la baeloji. Diamoheli di ka fumaneha lera la sele kapa ka hara sele (cytosol/nucleus). Ha sethethefatsi se kopana, seamoheli se ka feta phetohong ya sebopeho e bakang letoto la ditshebetso tse kang ho buleha ha kanale ya ion, ho kenngwa tshebetsong ha enzyme, tlhahiso ya bobedi ya morongwa, kapa diphetoho tlhahisong ya dijini.
Ho ya ka dimolekhule, ho tlamahana ha di-receptor tsa dithethefatsi ho kenyeletsa matla a sa kopaneng jwalo ka dibofo tsa haeterojene, matla a van der Waals, dikamano tsa hydrophobic, le dibofo tsa ionic. Ho ba haufi ha sebopeho le kabo ya tjhaja pakeng tsa sethethefatsi le sebaka sa ho tlamahana ha di-receptor ho etsa qeto ya hore na sethethefatsi se sebelisana ka matla le ka kgetho hakae.
Mefuta e meholo ea li-receptor tse reretsoeng lithethefatsi
1. Li-Receptor tse Kopantsoeng tsa Protheine ea G (GPCR)
Li-GPCR ke lelapa le leholo ka ho fetisisa la li-receptor 'me ke sepheo sa meriana e mengata. Li-receptor tsena li na le libaka tse supileng tsa transmembrane. Ha ligand e kopana, li-GPCR li kenya tšebetsong liprotheine tsa G tse ka hare ho sele, tse fetolang li-enzyme (tse kang adenylate cyclase) kapa likanale tsa ion. Sena se fella ka tlhahiso ea li-messenger tsa bobeli tse kang cAMP, IP3, le DAG, tse laolang likarabo tsa sele.
Mehlala ea bongaka: li-agonist tsa β2 (mohlala, salbutamol) li hlohlelletsa li-receptor tsa β2-adrenergic mesifa e boreleli ea bronchial bakeng sa bronchodilation; li-blocker tsa β (mohlala, propranolol kapa metoprolol) li thibela li-receptor tsa β ho fokotsa sekhahla sa pelo le ho ruruha ha eona.
2. Likanale tsa ion tse kentsweng ka lehare
Li-receptor tsena li sebetsa e le "menyako" e bulehang ha li-ligand li tlama, li lumella li-ion tse itseng ho feta, li fetola bokhoni ba lera le ts'ebetso ea li-neuron kapa mesifa. Karabelo ea tsona e potlakile haholo, e loketse phetiso ea lets'oao la methapo.
Mohlala, li-receptor tsa GABAA ke likanale tsa Cl⁻ tseo, ha li kentsoe tšebetsong, li hatellang ts'ebetso ea methapo ea kutlo. Li-Benzodiazepine li ntlafatsa litlamorao tsa GABA ho li-receptor tsena, e leng se fellang ka litlamorao tsa ho tšoenya le ho kokobetsa. Li-receptor tsa nicotinic acetylcholine le tsona ke tsa sehlopha sena 'me li bohlokoa phetisong ea methapo ea kutlo.
3. Li-kinase tsa tyrosine tsa receptor (RTK)
Li-RTK li lula ka har'a lera la sele 'me li na le ts'ebetso ea enzymatic. Ho tlama ha ligand (mohlala, lintlha tsa kholo) ho baka ho fokotseha ha li-receptor le autophosphorylation ea masala a tyrosine, ao ka mor'a moo a bokellang liprotheine tsa adaptor le ho kenya tšebetsong litsela tse kang MAPK/ERK kapa PI3K/AKT. Litsela tsena li susumetsa ho ata ha lisele, phapang le ho phela - e leng se etsang hore li be tsa bohlokoa kankere.
Mekhoa e mengata ea phekolo ea kankere e reretsoeng e sebetsa tsamaisong ena, joalo ka li-inhibitor tsa EGFR kapa HER2. Ka ho utloisisa sebopeho sa sebaka sa catalytic le sebaka sa sebaka sa ATP, meriana e ka etsoa e le li-inhibitor tse hlōlisanang kapa tsa allosteric.
4. Li-receptor tsa ka hare ho sele (nyuklea)
Li-receptor tsena li fumaneha ka har'a cytoplasm kapa nucleus 'me li kenngoa tšebetsong ke li-ligand tsa lipophilic tse ka tšelang lera la sele, joalo ka lihormone tsa steroid (cortisol, estrogen, testosterone) kapa lihormone tsa thyroid. Hang ha li kopantsoe, receptor-ligand complex e sebetsa e le transcription factor, e fetolang tlhahiso ea liphatsa tsa lefutso. Litlamorao li atisa ho ba butle empa li nka nako e telele.
Mohlala, li-glucocorticoids li thibela tlhahiso ea metsoako ea ho ruruha, e leng se etsang hore li sebetse hantle mafung a asma le a autoimmune. Leha ho le joalo, hobane li sebetsa boemong ba transcriptional, li boetse li na le litla-morao tse atileng tsa tsamaiso ea 'mele.
Ba-agonist, bahanyetsi, le ho feto-fetoha ha li-receptor
Ho pharmacology ea limolek'hule, lithethefatsi li ka sebetsa joalo ka:
– Li-agonist tse felletseng, tse kenyang receptor tšebetsong le ho hlahisa karabelo e phahameng ka ho fetisisa.
– Li-agonist tse sa fellang, tse kenyang tšebetsong li-receptor empa karabelo ea tsona e phahameng e tlase ho feta li-agonist tse felletseng leha li nka palo e kholo ea li-receptor.
– Bahanyetsi, ba tlamang ho li-receptor empa ba sa li sebelise, ka hona ba thibela liphello tsa li-agonist. Bahanyetsi ba ka ba le tlholisano (ba qothisana lehlokoa le sebaka se le seng) kapa ba se ke ba qothisana lehlokoa (ba tlamahane le sebaka se seng kapa ba tima receptor).
– Inverse agonist, e fokotsang ts'ebetso ea motheo ea receptor (ho li-receptor tse nang le ts'ebetso ea constitutive).
– Li-modulator tsa Allosteric, tse fetolang ts'ebetso ea li-receptor ka ho tlama sebakeng se seng ntle le sebaka sa mantlha sa ligand. Li-modulator tsa Allosteric li ka ntlafatsa (modulator ea allosteric e ntle) kapa tsa fokolisa (modulator ea allosteric e mpe) karabelo.
Mehopolo ena e bohlokoa hobane e hlalosa hore na ke hobane'ng ha meriana e 'meli e "khomarelang" ho receptor e le 'ngoe e ka hlahisa liphello tse fapaneng, le hore na ke hobane'ng ha meriana e meng e na le li-profile tse betere tsa litla-morao.
Khetho, ho ratana le katleho: lintho tse tharo tsa bohlokoa tse khethollang
Ho na le di-parameter tse tharo tsa bohlokwa ha ho lekolwa dikamano tsa dithethefatsi le di-receptor:
1. Kamano: hore na sethethefatsi se tlamahana ka matla hakae le receptor.
2. Bokgoni (mosebetsi wa kahare): bokgoni ba sethethefatsi ho baka karabelo kamora ho tlama.
3. Khetho: khetho ea moriana bakeng sa li-receptor tse itseng ha e bapisoa le li-receptor tse ling.
Sethethefatsi se nang le kamano e matla haholo se kanna sa se hlahise phello e matla ea bongaka haeba katleho ea sona e le tlase. Ka lehlakoreng le leng, khetho e etsa qeto ea hore na sethethefatsi ha se na monyetla o moholo oa ho baka litla-morao ka lebaka la tšebelisano le li-receptor liseleng tse ling.
Taolo ea moamoheli: ho hloka kutloelo-bohloko le mamello
Ho pepesehela lithethefatsi khafetsa ho ka fetola palo ea li-receptor le kutloelo-bohloko. Ho se be le kutloelo-bohloko ho etsahala ha li-receptor li se li sa arabele hantle, mohlala, ha li-GPCR li feta phosphorylation 'me li tlama ho β-arrestins, ebe li kenngoa ka hare. Ho tsosolosoa ho tsoelang pele ho ka lebisa ho fokotseha ha taolo (ho fokotseha ha palo ea li-receptor) le mamello ea kliniki, e leng se lebisang ho eketseheng ha litekanyetso bakeng sa phello e tšoanang. Ka lehlakoreng le leng, tšebeliso e sa feleng ea li-antagonists e ka lebisa ho eketseha ha taolo ea li-receptor le phello ea ho khutla ha eona haeba moriana o emisoa ka tšohanyetso.
Khopolo ena e hlalosa mekhoa ea bongaka e kang ho fokotsa tekanyo ea meriana mekhoeng e meng ea phekolo le bohlokoa ba ho utloisisa matla a li-receptor tšebelisong ea nako e telele.
Khemikhale ea limolek'hule nts'etsopele ea meriana ea sejoale-joale
Tsoelo-pele thutong ea baeloji ea sebopeho (mohlala, cryo-EM), k'hemistri ea k'homphieutha, le bioinformatics li nolofalletsa moralo oa lithethefatsi o thehiloeng sebopehong. Bafuputsi ba ka etsa mohlala oa hore na lithethefatsi li sebelisana joang le libaka tsa ho tlama li-receptor, ba lekola litlamorao tse ka bang teng tse seng tsa sepheo, 'me ba bolele esale pele chefo e ka bang teng. Ho feta moo, mekhoa ea pharmacogenomic e thusa ho hlalosa liphetoho tsa batho ka bomong karabelong, kaha liphetoho liphatseng tsa lefutso li-receptor kapa litseleng tsa lipontšo li ka susumetsa kutloisiso ea lithethefatsi.
Kalafong ea mofetše, mafu a ikemetseng, le mathata a metabolism, pharmacology ea limolek'hule e nolofalletsa mohopolo oa "meriana e nepahetseng": ho khetha meriana ho latela boemo ba limolek'hule ba mokuli, eseng matšoao a kliniki feela.
Ho koala
Thuto ea meriana ea limolek'hule le ho shebana le li-receptor li fana ka moralo oa saense oa ho utloisisa hore na lithethefatsi li sebetsa joang ka ho khetheha maemong a protheine le a tsela ea lipontšo. Ka ho utloisisa mefuta ea li-receptor, mekhoa ea ho kenya tšebetsong kapa ho thibela, le taolo e ikamahanyang le maemo joalo ka ho fokotsa kutloisiso, re ka hlalosa katleho ea lithethefatsi, litla-morao, likamano tsa lithethefatsi le nts'etsopele ea mamello. Mehleng ea meriana e nepahetseng, ho utloisisa thuto ea meriana ea limolek'hule ha ho bohlokoa feela ho bafuputsi empa hape ho fana ka lebaka la mokhoa o sireletsehileng le o sebetsang haholoanyane oa bongaka.
