Ubururu bwa metilene na Parkinson: ibimenyetso byo mu bushakashatsi bw'ibanze no ku bantu

Nushakisha ubururu bwa metilene n'indwara ya Parkinson, uzabona amagambo avugwa yizewe cyane kandi ashingiye ku bimenyetso bidakomeye. Ubushakashatsi ku mbeba bunini hano, igerageza ku ngirabuzimafatizo hariya, buri kimwe kigaragazwa nk'aho umuti ugiye kuboneka vuba. Ukuri gufite imbibi kurushaho, ariko kandi kurashishikaje. Hari ubushakashatsi nyakuri bwihariye kuri Parkinson, bwibanda cyane ku kurinda no kugarura imikorere ya mitokondiriya, ariko buracyari kure yo gutanga gihamya ku bantu. Iyi ngingo ikusanya ubwo bushakashatsi, bumwe ku bundi, kugira ngo ubone neza ibihari n'ibibura.

Impamvu abashakashatsi bakomeza kugaruka kuri iki kinyabutabire irumvikana. Ingirabuzimafatizo z'imyakura zikoresha dopamine zo muri substantia nigra zikenera ingufu nyinshi cyane, kandi kunanirwa kwa complex I hamwe n'umunaniro uterwa na okisidasiyo biri mu bintu by'ingenzi mu buryo bwinshi bwo kwigana Parkinson. Ubururu bwa metilene ni irangi rishobora guhinduranya imiterere ya okisidasiyo na redigisiyo, rigafata elegitoroni kuri NADH rikazigeza kuri cytochrome c. Bityo, rishobora kunyura ku rundi ruhande rwa complex I yangiritse, mu rugero runaka, ari na ko rigabanya umunaniro uterwa na okisidasiyo. Uburyo mitokondiriya ikoresha muri uku gutwara elegitoroni ni bwo buhuza ibigeragezo byose kuri Parkinson byavuzwe hano hasi. Birakwiye gusobanukirwa uko uku gutwara elegitoroni gukora mu ngirabuzimafatizo no mu binyabuzima byose uko byakabaye mbere yo gusuzuma igisubizo icyo ari cyo cyose. Abasomyi bataramenyera iki kinyabutabire bakwiye guhera ku buryo ubururu bwa metilene bukora ku rwego rw'ingirabuzimafatizo. Ujye uzirikana iyo shusho. Isobanura ibyiringiro bitangwa n'ubu bushakashatsi hamwe n'aho ibyo busobanura bitagihagije.

Ubushakashatsi ku kurinda striatum

Igerageza rigenzuwe neza kurusha ayandi rifitanye isano na Parkinson ryashyize rotenone, uburozi bwibasira complex I, muri striatum y'imbeba nini mu buryo butaziguye, hakoreshejwe cyangwa hatakoreshejwe ubururu bwa metilene muri ako gace. Rotenone yonyine yateye ibikomere binini abanditsi bagereranyije n'ubwonko bwangirika kubera ihungabana ry'imihindagurikire y'ibinyabutabire. Irangi ryatanzwe icyarimwe na yo ryagabanyije ingano y'ibikomere hafi kimwe cya kabiri, ririnda imikorere ya cytochrome oxidase, kandi ribuza kwiyongera k'umunaniro uterwa na okisidasiyo mu nkengero z'ibikomere. Ryarinze kandi imikorere y'imihindagurikire y'ibinyabutabire mu bice bifitanye amasano bigenga kugenda, birimo substantia nigra na pedunculopontine nucleus, rigumana imikoranire hagati y'urusobe rw'imyakura ya basal ganglia, kandi rigabanya mu rugero runaka ubusumbane hagati y'impande z'umubiri mu kumva no kugenda.

Hari ibintu bibiri bigomba kuzirikanwa. Icya mbere, irangi ryatanzwe hamwe n'uburozi, ntiryatanzwe nyuma y'uko kwangirika byari byamaze kubaho. Bityo, uku ni ukurinda kwangirika mu miterere isa n'igerageza ryo mu isahani ya laboratwari, aho kuba kuvura indwara. Icya kabiri, ubururu bwa metilene ntibwagaruye imikorere ya complex I muri mitokondiriya zari zatandukanyijwe n'ingirabuzimafatizo. Uburinzi bwaturutse ku kugabanya okisidasiyo no gushyigikira imihindagurikire y'ibinyabutabire hafi y'igikomere, ntibwaturutse ku gusana complex yangiritse ubwayo. Iri tandukaniro rigaragara mu bushakashatsi bwose.

Ubushakashatsi ku kurinda no kugarura dopamine

Uburyo bw'igerageza ku mbeba nini bwagize ingaruka ku mubiri wose bwegereye kurushaho impinduka nyakuri ziterwa na Parkinson. Rotenone yatanzwe hakoreshejwe agapompe gato yagabanyije dopamine yo muri striatum kandi yica ingirabuzimafatizo z'imyakura zikoresha dopamine zo muri substantia nigra. Nyamara, gutanga icyarimwe ubururu bwa metilene ku kigero gito byagaruye dopamine hafi ku rugero rwayo rwose kandi bigabanya cyane gutakaza ingirabuzimafatizo z'imyakura, guhagarikwa kw'imikorere ya complex I-III, ubwoko bwa ogisijeni bukora cyane, n'ibibazo byagaragaye mu bizamini bya rotarod, imigendere na catalepsy (PMID 21454572). Ubundi bushakashatsi bwa rotenone ku mbeba nini, bwakoresheje gutanga ibinyabutabire munsi y'uruhu, bwasanze uko igipimo cyiyongeraga ari ko okisidasiyo y'ibinure, gliosis, TNF-alpha na caspase-3 byagabanukaga. Igipimo cyo hejuru ni cyo cyarinze neza kurusha ibindi ibimenyetso bya tyrosine hydroxylase bigaragazwa no gusiga irangi. Ku rwego rwa mitokondiriya, ubururu bwa metilene ku bipimo bya nanomolar bwongereye hydrogen peroxide nk'ikimenyetso cya hormesis, butangije DNA ya mitokondiriya. Kubutanga mbere byarinze mitokondiriya zo mu gice cyo hasi cy'ubwonko bwo hagati ibikomere bya mtDNA biterwa na rotenone.

Ubushakashatsi bwa MPTP ku mbeba nto na bwo bwerekeza muri uwo murongo, ariko bufite ikintu cy'ingenzi kurushaho cyo kwitondera. Gutanga ubururu bwa metilene mbere ku gipimo cya 20 mg/kg/day byarinze ingirabuzimafatizo z'imyakura zo mu nzira ihuza substantia nigra na striatum, hamwe na dopamine yo muri striatum, bigaragara ko uburyo bwo kohereza ibimenyetso bwa BDNF bwabigizemo uruhare (PMID 29882218). Igihamya gikomeye kurushaho cyavuye mu bushakashatsi bwa MPTP/probenecid bw'igihe kirekire, bwatangiye gutanga ubururu bwa metilene bunyuzwa mu kanwa nyuma y'uko ibibazo byo kumva impumuro byari byamaze kugaragara. Nubwo byatangiye icyo gihe, byongereye ubushobozi bwo kumva impumuro, guhuza imigendere, no kubaho kw'ingirabuzimafatizo z'imyakura zikoresha dopamine (PMID 29684508). Icy'ingenzi, iryo tsinda ryakoze igerageza ryo kugenzura abakemanga basaba, maze ryerekana ko igipimo gito kitagabanyije MPP+ yo muri striatum, ikinyabutabire cy'uburozi gikomoka ku ihindurwa rya MPTP. Ibyo bikuraho ibisobanuro byoroshye kurusha ibindi by'uko igisubizo cyaba cyaratewe n'uburyo igerageza ryakozwe. Ubushakashatsi ku ngirabuzimafatizo z'imyakura zikoresha dopamine zahawe MPP bwongera ibisobanuro ku buryo ibi bikora: kugarura imikorere ya complex I na ATP, hakoreshejwe uburyo bwa AKT-Nrf2 bwo kohereza ibimenyetso bigabanya okisidasiyo (PMID 34352280), hamwe no kwandikwa kwa parkin kugengwa na NRF2 no kugarura iremwa rya mitokondiriya mu buryo bw'igerageza bw'umunaniro w'igihe kirekire.

Imbeba nini ya 6-OHDA, uburyo busanzwe bwo gutera igikomere ku ruhande rumwe, itanga igisubizo gito kurusha ibindi. Ubururu bwa metilene bwatangiye gutangwa buri munsi bunyuzwa mu kanwa nyuma yo kubaga bwarinze mu rugero ruto ingirabuzimafatizo z'imyakura zikoresha dopamine zo muri substantia nigra kandi butezimbere bimwe mu bijyanye no kwitondera ibintu. Ariko ntibwagaruye imikorere yo kugenda cyangwa iy'amaguru y'imbere (PMID 28694175). Igisubizo gito na cyo kirigisha. Ikinyabutabire kigarura ibintu byose muri buri buryo bw'igerageza akenshi kiba mu by'ukuri kitagarura ikintu na kimwe. Hano, imiterere y'inyungu irahinduka nk'uko bigenda mu mikorere nyakuri y'ibinyabuzima.

Ishami ry'ubushakashatsi kuri alpha-synuclein

Bitandukanye n'ubushakashatsi ku burozi, gahunda y'ubushakashatsi kuri methylthioninium iri mu miterere ya redigisiyo yagerageje kumenya niba iki kinyabutabire kibangamira kwirundanya kwa alpha-synuclein ubwako. Mu ngirabuzimafatizo zikora alpha-synuclein y'umuntu, imiterere ya redigisiyo yakuyeho ibirundo byo mu ntangiriro n'ibifite imiterere y'udutsi, hamwe na EC50 yegereye 1 micromolar. Gutanga igipimo kinyuzwa mu kanwa mu gihe cy'ibyumweru bitandatu byagabanyije impinduka z'indwara mu bice byinshi by'ubwonko, ari na ko bikosora imigendere idasanzwe mu mbeba nto zahinduriwe genes (PMID 29375308). Ubushakashatsi bwakurikiyeho ku rundi rubyaro rw'imbeba zahinduriwe genes bwasanze alpha-synuclein yo mu masinapusi yarasubiye ku bipimo byo mu mbeba zitahinduriwe genes, kandi ibibazo byo ku byakira glutamate byarakosowe. Icyakora, nta ngaruka zemeza ku myitwarire zagaragaye (PMID 35709886).

Zirikana ko ikinyabutabire cyahindutse. Ubu bushakashatsi bwakoresheje LMTM/HMTM, umunyu uri mu miterere ya redigisiyo wahamijwe, wateguriwe gahunda y'ubushakashatsi kuri Alzheimer, aho gukoresha chloride iri mu miterere ya okisidasiyo igurishwa nk'irangi. Ubushobozi bwo gukora bw'imwe muri izi miterere ntibuhita buba ubw'indi. Iryo tandukaniro risobanurwa mu buryo burambuye n'ibyavuye mu bigeragezo kuri Alzheimer.

Impamvu eshatu zo gusoma buri gisubizo witonze

Icya mbere, hafi ibipimo byose bitangwa icyarimwe n'uburozi cyangwa mbere yabwo. Irangi riba rihari mbere y'uburozi cyangwa hamwe na bwo. Ibyo bigerageza kureba niba gushyigikira mitokondiriya bishobora gukumira kwangirika, kandi ni ubushakashatsi bwemewe. Ariko ntibyigana umurwayi utangiye gufata inyunganiramirire nyuma y'imyaka myinshi atakaza ingirabuzimafatizo z'imyakura.

Icya kabiri, ubururu bwa metilene buhagarika imikorere ya anzime nyirizina ituma MPTP ihinduka uburozi bukora. MPTP, ibanziriza uburozi bukora, nta cyo yangiza kugeza ubwo MAO-B iyihinduye MPP+. Ubururu bwa metilene bugabanya iryo hinduka ku bipimo bya nanomolar. Bityo, igisubizo cyerekana uburinzi mu bushakashatsi bwa MPTP gishobora gusobanura ko uburozi butigeze butangira gukora, aho gusobanura ko ingirabuzimafatizo z'imyakura zarinzwe. Ubushakashatsi bw'igihe kirekire bwavuzwe haruguru ntibugibwaho n'iyi mpaka kubera igerageza ryabwo ryo kugenzura MPP+. Ubushakashatsi butagira iryo genzura bwo bugibwaho.

Icya gatatu, ibikomere biterwa n'uburozi si indwara ya Parkinson. Rotenone, MPTP na 6-OHDA byigana neza gutakaza dopamine n'umunaniro uterwa na okisidasiyo, ariko ntibyigana gukomeza kw'indwara mu myaka ibarirwa muri za mirongo, gukwirakwira kw'impinduka ziterwa na synuclein, cyangwa guhinduka kw'urusobe rw'imyakura mu ndwara y'abantu. Kurinda no kugarura imikorere mu nyamaswa ni impamvu yo gukora ibigeragezo, si ukwerekana mbere ibizavamo.

Ibimenyetso ku bantu: nta byo biraboneka

Kugeza muri 2026, nta gerageza ryatangajwe ryagabanyije abitabiriye mu matsinda ku buryo bwa tombola, kandi nta gerageza ryanditswe ririmo gukorwa aho abantu bahabwa ubururu bwa metilene, LMTM cyangwa HMTM ku ndwara ya Parkinson. Isuzuma riherutse ku buryo bwo kuvura ryabaruye ibigeragezo bya Parkinson byatangajwe bingana na zeru n'ibirimo gukorwa bingana na zeru. Gahunda za LMTM/HMTM zanditswe zireba indwara ya Alzheimer na demansiya y'ibice by'imbere n'iby'imisaya by'ubwonko yiganjemo impinduka z'imyitwarire. Ibisubizo byazo ntibishobora kwimurirwa kuri Parkinson. Umuntu wese ugurisha ubururu bwa metilene ku bimenyetso bya Parkinson muri iki gihe aba afatira ku mbeba nini n'ingirabuzimafatizo akabishyira ku bantu. Uko gufatira ku bushakashatsi bw'ibanze byarananiwe ku binyabutabire byinshi byari byitezweho kurinda imyakura kandi byagaragaraga ko bitanga ibyiringiro biruta iby'iki.

Ingingo z'umutekano zihariye ku barwayi ba Parkinson

Iki gice si umuburo rusange. Kireba imikoranire n'imiti abarwayi ba Parkinson bafata koko. Ubururu bwa metilene mu miterere yabwo y'ibanze ni ikinyabutabire gikomeye gihagarika imikorere ya MAO-A mu buryo bushobora gusubira inyuma, kandi kigahagarika iya MAO-B ku bipimo byo hejuru. Rasagiline, selegiline na safinamide ni imiti ihagarika imikorere ya MAO-B. Amabwiriza yayo abuza cyangwa aburira ku kuyihuza n'indi miti ihagarika imikorere ya MAO, kuko uku guhagarika imikorere gukomatanyijwe gushobora gutera uburozi bwa serotonin n'izamuka rikabije ry'umuvuduko w'amaraso. Kongera ubururu bwa metilene kuri iyo miti bitera imikoranire ifite akamaro gakomeye mu buvuzi, kandi nta makuru y'ubushakashatsi kuri Parkinson yemeza ko imiterere ya redigisiyo ya LMTM/HMTM yirinda iyo mikoranire.

Imikoranire n'imiti ivura agahinda gakabije ikora kuri serotonin yagaragajwe mu bantu. Mu isuzuma ry'ubushakashatsi ryakozwe mu buryo bunonosoye ku bibazo byo kujijwa byabaye nyuma yo gutanga ubururu bwa metilene mu mutsi, 25 muri 26 byabaye ku barwayi bafataga umuti uvura agahinda gakabije ukora kuri serotonin. Hari kandi raporo z'uko ibicuruzwa by'ubururu bwa metilene binyuzwa mu kanwa byateye sindorome ya serotonin. Agahinda gakabije gakunze kuboneka mu ndwara ya Parkinson kandi gakunze kuvurwa hakoreshejwe SSRIs cyangwa SNRIs. Bityo, iyi mikoranire ishobora kubaho cyane muri aba barwayi kurusha mu yandi matsinda menshi. Ibisobanuro byose ku mutekano n'imikoranire, hamwe n'ishusho yagutse y'ubushakashatsi ku bantu, bifasha kumva izi ngaruka mu mwanya wazo. Umuntu wese utekereza gukoresha ubururu bwa metilene hamwe n'imiti ya Parkinson cyangwa ivura agahinda gakabije akeneye gukurikiranwa n'umuganga mbere yo kubigerageza, atari nyuma y'uko ibimenyetso bigaragaye.

Umwanzuro ushobora gukubirwa mu rutonde rumwe. Uburyo bw'igerageza bushingiye ku burozi na synuclein bwerekana uburinzi buhoraho bwa mitokondiriya na dopamine, hamwe n'ibisubizo bihinduka koko hakurikijwe igipimo. Ibintu bitatu byavuzwe bishobora kugoreka ibisubizo bigomba kuzirikanwa muri buri gisubizo cya MPTP no gutanga ibinyabutabire icyarimwe, kandi ibimenyetso by'ubushobozi bwo gukora ku bantu biracyari ku bigeragezo bingana na zeru. Ni gahunda y'ubushakashatsi ikwiye gukurikiranwa, si uburyo bwo kuvura bukwiye kugurwa.