Intrathecal (IT) Txhaj Tshuaj: Ib Txoj Kev Xa Khoom Ncaj Ncees CNS Rau Kev Kho Mob Advanced - Kev txiav txim siab Preclinical

Taw qhia: Kev kov yeej cov ntshav-Brain Barrier nrog kev xa ncaj qha CNS

Cov ntshav -brain barrier (BBB) ​​nthuav tawm qhov kev sib tw loj heev rau kev xa cov kws kho mob mus rauCentral paj hlwb (CNS). Direct CNS cov txheej txheem xa khoom, suav nrogintrathecal (IT), intracerebroventricular (ICV), thiab intraparenchymal (ICM) kev tswj hwm, yog cov tswv yim tseem ceeb los hla qhov kev thaiv no. Cov kev no ua rau muaj kev xa tshuaj meej, ua kom muaj kev kho mob siab tshaj plaws nyob rau hauv CNS, thiab txo qis qhov cuam tshuam rau peripheral thiab cuam tshuam toxicities. Yog li ntawd, kev tswj hwm CNS ncaj qha, tshwj xeeb tshaj yog kev txhaj tshuaj intrathecal, tau siv ntau ntxiv rau cov kev kho mob zoo li oligonucleotide kev kho mob (ASOs, siRNAs) thiab kev kho ntawm tes thiab noob caj noob ces (CGT).

Piv nrog rau kev tswj hwm lub cev, kev xa ncaj qha CNS sai sai ua tiav cov tshuaj ntau hauv cov ntaub so ntswg, feem ntau obviating qhov xav tau rau cov koob tshuaj loj, muaj peev xwm ua rau muaj tshuaj lom. Qhov kom zoo dua no tso cai rau kev txhim kho ntawm cov tebchaw uas tej zaum yuav raug txiav tawm vim yog cov kab mob toxicity profiles. Tsis tas li ntawd, qhov tseem muaj nyob hauv cov kua cerebrospinal (CSF) thiab lub paj hlwb parenchyma, ua ke nrog BBB txwv cov dej ntws mus rau hauv lub cev, ua kom cov tshuaj muaj txiaj ntsig zoo hauv CNS thaum txo qis kev raug mob. Qhov no txo ​​cov kev pheej hmoo ntawm peripheral cov kev mob tshwm sim thiab muaj peev xwm txo qis qhov kev pheej hmoo ntawm kev tiv thaiv kab mob biologics, ua rau txoj hauv kev kom muaj kev nyab xeeb dua thiab muaj txiaj ntsig zoo rau kev kho mob CNS.

Tsab ntawv xov xwm no tsom mus rau kev tswj hwm intrathecal (IT), sau cov txheej txheem tseem ceeb, sib tham txog qhov zoo thiab qhov tsis zoo, thiab qhia txog cov kev pheej hmoo toxicological uas tau ntsib thaum tsis yog- kev tshawb fawb txog kev nyab xeeb, lub hom phiaj los txhawb kev soj ntsuam kev soj ntsuam zoo ntawm CNS kev kho mob.

Nkag siab Intrathecal (IT) Txhaj

Kev txhaj tshuaj Intrathecal (IT) suav nrog kev tswj hwm tus neeg sawv cev kho mob ncaj qha rau hauv qhov chaw subarachnoid, thaj chaw nyob ib puag ncig tus txha caj qaum uas muaj CSF. Qhov no feem ntau ua tiav los ntawm lumbar puncture. Thaum muab tshuaj, cov tshuaj tawg mus thoob plaws hauv CSF, mus txog qhov chaw hauv lub hlwb thiab tus txha caj qaum. Tus txheej txheem, IT xa tuaj yeem ua tiav los ntawm kev ncaj qha lumbar puncture, tso catheter ntawm lumbar puncture, lossis catheter tso ntawm cisterna magna puncture (txawm tias tsis tshua muaj rau niaj hnub preclinical IT). Cov tshuab xa tuaj tuaj yeem muaj los ntawm cov twj sab nraud mus rau semi- cog lossis cog cov khoom siv rau kev tswj xyuas ntev. Lub lumbar puncture koob yuav tsum hla ob peb txheej: daim tawv nqaij, supraspinous ligament, interspinous ligament, ligamentum flavum, epidural chaw, dura mater, subdural qhov chaw, thiab arachnoid mater mus txog qhov chaw subarachnoid.

Kev tswj hwm IT ua tau zoo thiab rov tsim dua tshiab hauv cov tsis yog- hom tshuaj kho mob yuav tsum tau ceev faj cov txheej txheem thiab hom- kev paub tshwj xeeb:

Qhov Chaw Txhaj Tshuaj & Kev Pom Zoo:

Tsis yog -Human Primates (NHPs)& dev:Cov cheeb tsam lumbar, feem ntau yog nruab nrab ntawm L3 / L4 lossis L4 / L5 vertebrae, nyiam dua. Cov cheeb tsam no sib haum mus rau cauda equina, txo qhov kev pheej hmoo ntawm kev raug mob ntawm tus txha caj qaum. Qhov loj dua lumbar cistern ntim hauv cov hom no yooj yim rau kev tso koob. Cov tub ntxhais hluas NHP tuaj yeem xav tau kev sib tsoo ntawm qib siab dua (L2/L3 lossis L3/L4). Kev tso kawm tiav tau lees paub los ntawm qhov pom tseeb ntawm CSF tawm ntawm lub koob hub.

Nas & nas:L5 / L6 intervertebral chaw feem ntau siv. Ib tus cwj pwm tail flick feem ntau suav hais tias yog qhov qhia tau tias muaj kev vam meej subarachnoid chaw nkag.

Luav:Lub L6 / L7 intervertebral qhov chaw feem ntau yog tsom, nrog CSF outflow lees paub qhov tseeb qhov chaw.

Ncej -Kev txhaj tshuaj:Tom qab txhaj tshuaj, tswj koob txhaj tshuaj rau lub sijhawm luv luv (xws li, 5-10 feeb hauv NHPs, muaj peev xwm ntev dua hauv cov nas) thiab tso tus tsiaj lub taub hau (Trendelenburg txoj hauj lwm) tuaj yeem pab txhawb rostral faib ntawm cov tshuaj txhaj rau lub hlwb ventricles thiab txwv kev sib koom ua ke ntawm qhov chaw txhaj tshuaj.

Rov Ua Kev Kawm Dosing:

Ntau CNS kev kho mob, tshwj xeeb tshaj yog oligonucleotides, yuav tsum tau rov ua haujlwm IT. Cov kev tshawb fawb preclinical yuav tsum ntsuas qhov kev zam ntawm kev txhaj tshuaj rov ua dua thiab ntsuas qhov muaj peev xwm ua kom khaus hauv zos. Ob qho tib si kev raug mob ntawm rov punctures thiab formulation / tshuaj yeeb tshuaj nws tus kheej tuaj yeem ua rau muaj kev cuam tshuam hauv zos. Ua tib zoo saib xyuas ntawm qhov chaw txhaj tshuaj thiab cov ncauj lus kom ntxaws histopathological yog qhov tseem ceeb. Piv txwv li, rov ua IT koob tshuaj ziconotide tau cuam tshuam nrog kev khaus hauv zos, xav tau kev soj ntsuam ze.

Qhov zoo:

• Direct CNS Targeting:Bypasses BBB, xa tshuaj ncaj qha mus rau qhov chaw ua haujlwm.
• Siab CNS Concentration: Achieves CSF drug concentrations potentially >100-fold siab dua qhov sib npaug ntawm cov koob txhaj tshuaj.
• Txo Cov Txheej Txheem Tshaj Tawm:Minimizes peripheral phiv thiab toxicity.
• Tsawg Immunogenicity Risk:Kev txo qis ntawm cov kab mob hauv lub cev tuaj yeem txo qhov kev pheej hmoo ntawm kev tiv thaiv kab mob rau kev kho mob biologic.
• Txhim khu kev ua tau zoo / qis dua:Ua kom muaj zog CNS cov teebmeem ntawm cov koob tshuaj qis dua piv rau cov kab ke hauv lub cev (xws li, IT baclofen rau spasticity).
• Ntev CNS Ib nrab -Lub Neej:Cov tshuaj tshem tawm los ntawm qhov ntim me me ntawm CSF (kwv yees . 140} mL hauv tib neeg vs . 3500 mL ntshav) feem ntau qeeb dua los ntawm cov ntshav .

Disadvantages & Risks:

Clinical:

• Cov txheej txheem teeb meem:Tom qab- lumbar puncture headache (PLPH), mob nraub qaum, kab mob (meningitis), los ntshav / hematoma.
• Qhov chaw tsis raug:Kev txhaj tshuaj raug mob mus rau hauv qhov chaw subdural lossis epidural (clinically qhia txog li 10%).
• Ua raws li tus neeg mob:Rov ua dua lumbar punctures tuaj yeem ua rau tsis zoo, cuam tshuam rau kev ua haujlwm ntev -. Kev sib xyaw IV / IT kev tswj hwm qee zaum tshawb nrhiav.
• Technical nyuaj:Nyuaj rau cov me nyuam mos, cov neeg mob uas muaj tus txha caj qaum deformities, los yog rog. Ultrasound lossis lwm yam kev taw qhia yuav tsum tau.

Tsis yog-Tshuaj Kho Mob (Kev txhawj xeeb txog Toxicology):

• Neurotoxicity:Cov teebmeem tshuaj ncaj qha lossis cov tshuaj tsim tawm tuaj yeem ua rau muaj kev puas tsuaj rau neuronal (vacuolation, necrosis), gliosis, lossis kev ua haujlwm tsis txaus. Nusinersen cov kev tshawb fawb hauv cov menyuam yaus liab pom tau tias muaj kev cuam tshuam ntawm tus txha nraub qaum thiab kev hloov pauv ntawm cov neuronal ntawm cov koob tshuaj ntau.
• Kev mob:Tshuaj meningitis / encephalitis, tus cwj pwm los ntawm inflammatory cell infiltrates (mononuclear hlwb, macrophages) nyob rau hauv lub meninges los yog parenchyma.
• Txhaj tshuaj tiv thaiv qhov chaw:Cov neeg kho tshuab raug mob thiab/los yog tshuaj khaus khaus tuaj yeem ua rau tus txha caj qaum hauv paus caj dab, axonal degeneration, demyelination, gliosis, o, thiab granuloma tsim ntawm lossis ze ntawm qhov chaw txhaj tshuaj.
• Nce Intracranial Pressure (ICP):Kev txhaj tshuaj sai ntawm cov ntim loj tuaj yeem ua rau ICP nce ntxiv, uas ua rau muaj cov tsos mob xws li xeev siab lossis ntuav (saib hauv tsiaj thiab tib neeg).
• Tawm -Cov teebmeem:Cov kev hloov pauv histopathological tuaj yeem pom nyob deb ntawm qhov chaw txhaj tshuaj, piv txwv li, lub hlwb (hemorrhage, gliosis, cellular infiltrates) lossis sciatic paj hlwb (axonal / fiber ntau degeneration).

Piv txwv li: Nusinersen thiab Tofersen

Nusinersen (Spinraza®) thiab Tofersen (Qalsody®) yog antisense oligonucleotides (ASOs) pom zoo rau Spinal Muscular Atrophy (SMA) thiab ib daim ntawv tshwj xeeb ntawm Amyotrophic Lateral Sclerosis (ALS), feem. Ob leeg tso siab rau IT kev tswj hwm rau kev ua tau zoo.

Nusinersen:Lub hom phiaj SMN2 ua ntej-mRNA txhawm rau ua kom muaj txiaj ntsig SMN protein ntau lawm, hais txog qhov laj thawj ntawm SMA. Lub cev muaj zog neuron lub cev nyob hauv feem ntau hauv qaum qaum thiab lub hlwb. IT xa ncaj qha rau cov hlwb no. Cov kev tshawb fawb ua ntej hauv SMA nas qauv pom tau hais tias ncaj qha CSF txhaj tshuaj txuas ntxiv kev muaj sia nyob thiab tiv thaiv lub cev muaj zog neurons. IT kev tswj hwm ua tiav kev faib tawm thoob plaws hauv qaum qaum (siab tshaj plaws) thiab lub hlwb, nrog rau cov ntaub so ntswg ntev.

Cov txiaj ntsig ntawm Toxicology:Tsis yog- kev tshawb fawb IT rau ob qho tshuaj tau qhia txog kev pheej hmoo xws li kev nqus cov hlab ntsha neuronal, neuronal / glial necrosis, thiab qhov chaw txhaj tshuaj (mononuclear cell / macrophage infiltration). Clinically, Nusinersen yog txuam nrog cov txheej txheem kev pheej hmoo (mob nraub qaum, mob taub hau) thiab cov tshuaj muaj peev xwm / chav kawm (thrombocytopenia, raum toxicity). Tofersen muaj kev pheej hmoo suav nrog cov xwm txheej tseem ceeb xws li myelitis, aseptic meningitis, thiab nce ICP, nrog rau cov txheej txheem / mob mob. Cov kev tshawb pom no qhia txog qhov yuav tsum tau ua tib zoo saib xyuas, suav nrog CSF kev tshuaj xyuas, kev kuaj mob paj hlwb, thiab kev ntsuam xyuas tus txha caj qaum lossis ICP, tshwj xeeb yog muab Nusinersen siv rau cov neeg mob hauv cov menyuam yaus uas tus txha caj qaum tau txhim kho.

Implanted Catheters thiab Chronic Dosing

Rau cov kev kho mob uas xav tau kev tswj xyuas tas li los yog tas mus li, implanted IT catheters txuas nrog cov chaw nres nkoj subcutaneous lossis cov twj tso kua mis muaj lwm txoj hauv kev rov ua dua lumbar punctures. Txawm li cas los xij, txoj hauv kev no ua rau muaj kev pheej hmoo ntawm kev phais mob, muaj peev xwm kis tau tus mob (xws li mob meningitis), catheter hloov chaw lossis occlusion, thiab yuav tsum tau ceev faj tswj. Cov tshuaj tiv thaiv hauv zos rau cov khoom siv catheter thiab cov tshuaj tsim tawm tseem yog ib qho kev txiav txim siab, yuav tsum muaj kev ntsuam xyuas hauv cov kev tshawb fawb tsis yog -.

Xaus: Navigating Complexities ntawm Preclinical IT Studies

Kev txhaj tshuaj Intrathecal yog ib txoj hauv kev muaj zog thiab tseem ceeb ntxiv rau kev xa cov tshuaj kho CNS tshiab, ua tau zoo hla BBB thiab ua kom muaj kev kho mob. Txawm li cas los xij, nws daim ntawv thov ua tiav yuav tsum tau ua tib zoo xav txog cov txheej txheem nuances thoob plaws ntau hom kab mob preclinical thiab kev nkag siab zoo txog qhov muaj peev xwm hauv zos thiab cov kab mob toxicities. Kev soj ntsuam nruj tsis zoo -kev soj ntsuam kev nyab xeeb, suav nrog kev soj ntsuam ntxaws ntxaws ntawm cov kab mob neurobehavior, neuropathology (ntawm qhov chaw txhaj tshuaj thiab thaj tsam CNS distal), thiab muaj feem cuam tshuam rau ICP, yog qhov tseem ceeb.

Cov kws tshaj lij hauv kev tsim thiab ua tiav cov kev tshawb fawb tshwj xeeb uas tsis yog -cov kev tshawb fawb soj ntsuam, suav nrog cov txheej txheem kev tswj hwm IT meej thiab kev ntsuas tshuaj lom neeg muaj txiaj ntsig, yog qhov tseem ceeb rau de- pheej hmoo rau CNS cov neeg sib tw tshuaj thiab ua txoj hauv kev rau kev txhais lus kho mob ua tiav.