JP2022514187A - IVIGの代替のための多量体ハイブリッドFc蛋白質 - Google Patents
IVIGの代替のための多量体ハイブリッドFc蛋白質 Download PDFInfo
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Abstract
Description
本願は、2018年11月14日に出願されたUS 62/767,303の利益を主張するものであり、全ての目的のためにその全体が参照により組み込まれる。
本願は、2019年10月24日に作成された85キロバイトの538890WO-ST25という名前のtxtファイル中の配列を含み、これは参照により組み込まれる。
本発明のハイブリッドFc蛋白質は、典型的には単離された形態で提供される。これは、ハイブリッドFc蛋白質が、その生産又は精製に起因する干渉蛋白質及び他のコンタミネーション物質を、典型的には少なくとも50%w/wの純度で含んでいることを意味するが、ハイブリッドFc蛋白質が、その使用を容易にするために意図された過剰の薬学的に許容される担体又は他のビヒクルと組み合わされる可能性を排除するものではない。場合によっては、ハイブリッドFc蛋白質は、生産又は精製から生じる干渉蛋白質及びコンタミネーション物質に対して少なくとも60、70、80、90、95又は99%w/wの純度である。多くの場合、ハイブリッドFc蛋白質は、その精製後に残っている優勢な高分子種である。
本発明のハイブリッドFc蛋白質は、IgG Fc及びIgM Fc成分を含む。IgG Fc成分は、ヒンジ領域の少なくとも一部とCH2及びCH3領域を含む。IgM成分は、Cμ定常領域のCμ3及びCμ4領域を含む。ハイブリッドFc蛋白質は、ヒンジ領域内のシステイン間の鎖間ジスルフィド結合によって二重鎖を形成できる。この二重鎖は、IgM Fc部分のジスルフィド結合によって多量体化できる。ハイブリッドFc蛋白質のIgG部分は、他のIgG分子と同様に、FcRn受容体に特異的な親和性を有す。しかし、IgM Fcを介した多量体化の結果、この結合のアビディティが増大する。本発明の実施にメカニズムの理解は求められないが、ハイブリッドFc蛋白質のFcRnへの結合は、内因性IgGのFcRnへの結合と競合するため、内因性IgGの半減期を減少させると考えられる。内因性IgGの半減期の減少は、これまで経静脈的免疫グロブリンで治療されていたような、内因性IgGを媒介とする免疫疾患の治療に有用である。US 9,382,319の既述の抗体又は融合蛋白質とは対照的に、この作用機序は、ハイブリッドFc領域に連結された抗体可変領域又は異種ポリペプチドによって提供される結合領域による標的の係合を介して、対象において治療が効果的に行われることを必要としない。上記の利点は、ハイブリッドFc蛋白質の発現のための核酸コンストラクトの作製に関与する以外のインビトロの操作なしに行うことができる。
ハイブリッドFc蛋白質は、IgG Fc及びIgM Fc部分を含む。IgG Fc部分は、ヒンジ領域の少なくとも一部とCH2及びCH3領域を含む。CH2とCH3領域は、FcRnの結合、プロテインA及びGの結合、ADCC(抗体依存性細胞傷害)、CDC(補体依存性細胞傷害)、オプソニン化などの役割を担っているか、又はその少なくとも一部を担っている。ヒンジ領域の少なくとも一部の役割は、IgG Fc領域を二重化する鎖間ジスルフィド結合を形成するためのシステイン残基を供給することである。ヒンジ領域の少なくとも一部には、天然のヒンジ領域に含まれる少なくとも1つ、通常は2つ以上のシステインと、二重鎖を形成する望ましい鎖間ジスルフィド結合をサポートするのに十分な周辺残基を含む。しかし、天然のヒンジ領域の全てのシステイン残基がFc領域間の二重鎖形成に寄与するわけではなく、そのような他のシステイン残基のいずれか又はすべてを除去するか、又はセリン又はアラニン又はグリシンなどの他の残基で置換して、システインが不自然なジスルフィド結合に参加することを避けることができる。従って、ヒンジ領域の一部、通常はN-末端部分を、典型的には25、20、15、10、5残基以下の合成ペプチドで置き換えることができる。システイン残基を提供するだけでなく、任意の合成ペプチドを含むヒンジ領域は、二重鎖や多量体を形成するための柔軟性を提供する。Gly、ala及びserは、この目的のための例示的な残基である。合成ペプチドは、自然界に単離されたペプチドとして生じないという意味で合成であり、それが結合するヒンジ又はその部分に自然に連結していない配列を有しているが、本実施例のように、ヒンジ領域の一部、特にN-末端部分の変異バージョンであることも可能である。合成ペプチドは、多くの場合、ala、gly及び/又はserが過剰に含まれている(即ち、合成ペプチドの全残基の少なくとも25、35又は50%がala、gly及び/又はserである)。
ハイブリッドFc蛋白質は、組換え発現により生産される。ハイブリッドFc蛋白質は、IgG Fc部分をコードするDNAセグメントを、Cμ部分をコードするDNAセグメントとフレーム内で融合させることによって実現される。好ましくは、IgGのCH3エクソンの最後のアミノ酸が、Cμ3エクソンの最初のアミノ酸とフレーム内で融合される。
本発明のハイブリッドFc蛋白質は、抗体又はB細胞機能によって媒介される様々な状態、特に背景技術に示されているようにIVIGによって以前に治療された状態を治療するのに有用である。そのような状態には、免疫疾患、炎症性疾患、臓器移植後の拒絶反応、血液疾患、皮膚疾患、又は神経筋疾患を含む。状態の指定は相互に排他的ではない。従って、免疫疾患は、例えば、炎症性疾患でもあり得る。ハイブリッドFc蛋白質は、循環内の内因性IgG分子の半減期を減少させ、内因性B細胞の免疫応答を抑制し、循環内の内因性IgG分子の濃度を減少させることによって、そのような状態を治療できる。
50μgのマウスモノクローナルIgG1抗体ABC2と100μg(グループD)又は400μg(グループE)のLS41K-Fc.SLを、1グループあたり3匹のBalb/cマウスに心臓内投与した。投与から2時間後(2HR)、1日後(Day1)、3日後(Day3)、5日後(Day5)、8日後(Day8)にこれらのマウスから血清を採取した。血清サンプル中のABC2、マウスIgG及びLS41K-Fc.SLの各濃度は、上述のようにELISAで測定した。
400μgのLS41K-Fc.SLの投与(グループE)は、100μgのLS41K-Fc.SLの投与(グループD)よりも迅速に循環内のABC2の濃度を低下させた。
配列表
配列番号1
pVF101にコードされるLS41A-Fcに使用されるシグナルペプチドのアミノ酸配列
MGWSWIFFFLLSGTASVLS
配列番号2
pVF101にコードされるヒトガンマ-1重鎖のヒンジ領域のアミノ酸配列
EPKSCDKTHTCPPCP
配列番号3
pVF101にコードされるヒトガンマ-1重鎖のCH2領域のアミノ酸配列
APELLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAK
配列番号4
pVF101にコードされるヒトガンマ-1重鎖のCH3領域のアミノ酸配列
GQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK
配列番号5
pVF101にコードされるヒトmu重鎖のCμ3領域のアミノ酸配列
DQDTAIRVFAIPPSFASIFLTKSTKLTCLVTDLTTYDSVTISWTRQNGEAVKTHTNISESHPNATFSAVGEASICEDDWNSGERFTCTVTHTDLPSPLKQTISRPK
配列番号6
pVF101にコードされるヒトmu重鎖のCμ4領域のアミノ酸配列
GVALHRPDVYLLPPAREQLNLRESATITCLVTGFSPADVFVQWMQRGQPLSPEKYVTSAPMPEPQAPGRYFAHSILTVSEEEWNTGETYTCVVAHEALPNRVTERTVDKSTGKPTLYNVSLVMSDTAGTCY
配列番号7
pVF101にコードされる成熟LS41A-Fc蛋白質のアミノ酸配列
EPKSCDKTHTCPPCPAPELLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGKDQDTAIRVFAIPPSFASIFLTKSTKLTCLVTDLTTYDSVTISWTRQNGEAVKTHTNISESHPNATFSAVGEASICEDDWNSGERFTCTVTHTDLPSPLKQTISRPKGVALHRPDVYLLPPAREQLNLRESATITCLVTGFSPADVFVQWMQRGQPLSPEKYVTSAPMPEPQAPGRYFAHSILTVSEEEWNTGETYTCVVAHEALPNRVTERTVDKSTGKPTLYNVSLVMSDTAGTCY
配列番号8
pVF102にコードされるヒンジ領域の一部と融合したペンタペプチドのアミノ酸配列
EPKSS
配列番号9
pVF102にコードされるヒトガンマ-1重鎖の改変CH2領域のアミノ酸配列
APEAAGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAK
配列番号10
pVF102にコードされるヒトmu重鎖のCμ3領域のアミノ酸配列
DQDTAIRVFAIPPSFASIFLTKSTKLTCLVTDLTTYDSVTISWTRQNGEAVKTHTNISESHPNATFSAVGEASICEDDWNSGERFTCTVTHTDLASSLKQTISRPK
配列番号11
pVF102にコードされる成熟LS41K-Fc.S蛋白質のアミノ酸配列
EPKSSDKTHTCPPCPAPEAAGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGKDQDTAIRVFAIPPSFASIFLTKSTKLTCLVTDLTTYDSVTISWTRQNGEAVKTHTNISESHPNATFSAVGEASICEDDWNSGERFTCTVTHTDLASSLKQTISRPKGVALHRPDVYLLPPAREQLNLRESATITCLVTGFSPADVFVQWMQRGQPLSPEKYVTSAPMPEPQAPGRYFAHSILTVSEEEWNTGETYTCVVAHEALPNRVTERTVDKSTGKPTLYNVSLVMSDTAGTCY
配列番号12
pVF103にコードされるヒトガンマ-1重鎖の改変CH3領域のアミノ酸配列
GQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVLHEALHNHYTQKSLSLSPGK
配列番号13
pVF103にコードされる成熟LS41K-Fc.SL蛋白質のアミノ酸配列
EPKSSDKTHTCPPCPAPEAAGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVLHEALHNHYTQKSLSLSPGKDQDTAIRVFAIPPSFASIFLTKSTKLTCLVTDLTTYDSVTISWTRQNGEAVKTHTNISESHPNATFSAVGEASICEDDWNSGERFTCTVTHTDLASSLKQTISRPKGVALHRPDVYLLPPAREQLNLRESATITCLVTGFSPADVFVQWMQRGQPLSPEKYVTSAPMPEPQAPGRYFAHSILTVSEEEWNTGETYTCVVAHEALPNRVTERTVDKSTGKPTLYNVSLVMSDTAGTCY
配列番号14
C末端で6つのヒスチジン残基と融合したヒトCD122細胞外領域の成熟フォームのアミノ酸配列(CD122-His)
SAAVNGTSQFTCFYNSRANISCVWSQDGALQDTSCQVHAWPDRRRWNQTCELLPVSQASWACNLILGAPDSQKLTTVDIVTLRVLCREGVRWRVMAIQDFKPFENLRLMAPISLQVVHVETHRCNISWEISQASHYFERHLEFEARTLSPGHTWEEAPLLTLKQKQEWICLETLTPDTQYEFQVRVKPLQGEFTTWSPWSQPLAFRTKPAALGKDTTGGGAHHHHHH
配列番号15
pVF104にコードされる成熟LS41K-Fc.SL.F241A蛋白質のアミノ酸配列
EPKSSDKTHTCPPCPAPEAAGGPSVALFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVLHEALHNHYTQKSLSLSPGKDQDTAIRVFAIPPSFASIFLTKSTKLTCLVTDLTTYDSVTISWTRQNGEAVKTHTNISESHPNATFSAVGEASICEDDWNSGERFTCTVTHTDLASSLKQTISRPKGVALHRPDVYLLPPAREQLNLRESATITCLVTGFSPADVFVQWMQRGQPLSPEKYVTSAPMPEPQAPGRYFAHSILTVSEEEWNTGETYTCVVAHEALPNRVTERTVDKSTGKPTLYNVSLVMSDTAGTCY
配列番号16
pVF105にコードされる成熟LS41K-Fc.SL.F243A蛋白質のアミノ酸配列
EPKSSDKTHTCPPCPAPEAAGGPSVFLAPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVLHEALHNHYTQKSLSLSPGKDQDTAIRVFAIPPSFASIFLTKSTKLTCLVTDLTTYDSVTISWTRQNGEAVKTHTNISESHPNATFSAVGEASICEDDWNSGERFTCTVTHTDLASSLKQTISRPKGVALHRPDVYLLPPAREQLNLRESATITCLVTGFSPADVFVQWMQRGQPLSPEKYVTSAPMPEPQAPGRYFAHSILTVSEEEWNTGETYTCVVAHEALPNRVTERTVDKSTGKPTLYNVSLVMSDTAGTCY
配列番号17
pFCm512にコードされるヒトベータ-ガラクトシドアルファ-2,6-シアリルトランスフェラーゼ1(ST6GAL1)のアミノ酸配列
MIHTNLKKKFSCCVLVFLLFAVICVWKEKKKGSYYDSFKLQTKEFQVLKSLGKLAMGSDSQSVSSSSTQDPHRGRQTLGSLRGLAKAKPEASFQVWNKDSSSKNLIPRLQKIWKNYLSMNKYKVSYKGPGPGIKFSAEALRCHLRDHVNVSMVEVTDFPFNTSEWEGYLPKESIRTKAGPWGRCAVVSSAGSLKSSQLGREIDDHDAVLRFNGAPTANFQQDVGTKTTIRLMNSQLVTTEKRFLKDSLYNEGILIVWDPSVYHSDIPKWYQNPDYNFFNNYKTYRKLHPNQPFYILKPQMPWELWDILQEISPEEIQPNPPSSGMLGIIIMMTLCDQVDIYEFLPSKRKTDVCYYYQKFFDSACTMGAYHPLLYEKNLVKHLNQGTDEDIYLLGKATLPGFRTIHC
配列番号18
pFCm513にコードされるヒトベータ-1,4-ガラクトシルトランスフェラーゼ1(B4GALT1)のアミノ酸配列
MRLREPLLSGSAAMPGASLQRACRLLVAVCALHLGVTLVYYLAGRDLSRLPQLVGVSTPLQGGSNSAAAIGQSSGELRTGGARPPPPLGASSQPRPGGDSSPVVDSGPGPASNLTSVPVPHTTALSLPACPEESPLLVGPMLIEFNMPVDLELVAKQNPNVKMGGRYAPRDCVSPHKVAIIIPFRNRQEHLKYWLYYLHPVLQRQQLDYGIYVINQAGDTIFNRAKLLNVGFQEALKDYDYTCFVFSDVDLIPMNDHNAYRCFSQPRHISVAMDKFGFSLPYVQYFGGVSALSKQQFLTINGFPNNYWGWGGEDDDIFNRLVFRGMSISRPNAVVGRCRMIRHSRDKKNEPNPQRFDRIAHTKETMLSDGLNSLTYQVLDVQRYPLYTQITVDIGTPS
配列番号 19
ヒトFcRnのシグナルペプチド及び細胞外領域のアミノ酸配列
MGVPRPQPWALGLLLFLLPGSLGAESHLSLLYHLTAVSSPAPGTPAFWVSGWLGPQQYLSYNSLRGEAEPCGAWVWENQVSWYWEKETTDLRIKEKLFLEAFKALGGKGPYTLQGLLGCELGPDNTSVPTAKFALNGEEFMNFDLKQGTWGGDWPEALAISQRWQQQDKAANKELTFLLFSCPHRLREHLERGRGNLEWKEPPSMRLKARPSSPGFSVLTCSAFSFYPPELQLRFLRNGLAAGTGQGDFGPNSDGSFHASSSLTVKSGDEHHYCCIVQHAGLAQPLRVELESPAKSS
配列番号20
FLAGペプチドのアミノ酸配列
DYKDDDDK
配列番号21
ヒトCD55のGPIアンカレッジシグナルのアミノ酸配列
PNKGSGTTSGTTRLLSGHTCFTLTGLLGTLVTMGLLT
配列番号22
pFCm239にコードされるhFcRn-FLAG-GPIのアミノ酸配列
MGVPRPQPWALGLLLFLLPGSLGAESHLSLLYHLTAVSSPAPGTPAFWVSGWLGPQQYLSYNSLRGEAEPCGAWVWENQVSWYWEKETTDLRIKEKLFLEAFKALGGKGPYTLQGLLGCELGPDNTSVPTAKFALNGEEFMNFDLKQGTWGGDWPEALAISQRWQQQDKAANKELTFLLFSCPHRLREHLERGRGNLEWKEPPSMRLKARPSSPGFSVLTCSAFSFYPPELQLRFLRNGLAAGTGQGDFGPNSDGSFHASSSLTVKSGDEHHYCCIVQHAGLAQPLRVELESPAKSSTGGGDYKDDDDKGGGPNKGSGTTSGTTRLLSGHTCFTLTGLLGTLVTMGLLT
配列番号23
ヒトβ2ミクログロブリンのアミノ酸配列
MSRSVALAVLALLSLSGLEAIQRTPKIQVYSRHPAENGKSNFLNCYVSGFHPSDIEVDLLKNGERIEKVEHSDLSFSKDWSFYLLYYTEFTPTEKDEYACRVNHVTLSQPKIVKWDRDM
配列番号24
マウスFcRnのシグナルペプチド及び細胞外領域のアミノ酸配列
MGMPLPWALSLLLVLLPQTWGSETRPPLMYHLTAVSNPSTGLPSFWATGWLGPQQYLTYNSLRQEADPCGAWMWENQVSWYWEKETTDLKSKEQLFLEALKTLEKILNGTYTLQGLLGCELASDNSSVPTAVFALNGEEFMKFNPRIGNWTGEWPETEIVANLWMKQPDAARKESEFLLNSCPERLLGHLERGRRNLEWKEPPSMRLKARPGNSGSSVLTCAAFSFYPPELKFRFLRNGLASGSGNCSTGPNGDGSFHAWSLLEVKRGDEHHYQCQVEHEGLAQPLTVDLDSSARSS
配列番号25
pFCm380にコードされるmFcRn-FLAG-GPIのアミノ酸配列
MGMPLPWALSLLLVLLPQTWGSETRPPLMYHLTAVSNPSTGLPSFWATGWLGPQQYLTYNSLRQEADPCGAWMWENQVSWYWEKETTDLKSKEQLFLEALKTLEKILNGTYTLQGLLGCELASDNSSVPTAVFALNGEEFMKFNPRIGNWTGEWPETEIVANLWMKQPDAARKESEFLLNSCPERLLGHLERGRRNLEWKEPPSMRLKARPGNSGSSVLTCAAFSFYPPELKFRFLRNGLASGSGNCSTGPNGDGSFHAWSLLEVKRGDEHHYQCQVEHEGLAQPLTVDLDSSARSSTGGGDYKDDDDKGGGPNKGSGTTSGTTRLLSGHTCFTLTGLLGTLVTMGLLT
配列番号26
ヒトIgG2-ベースのハイブリッドFc蛋白質のアミノ酸配列
ERKCCVECPPCPAPPVAGPSVFLFPPKPKDTLMISRTPEVTWVVVDVSHEDPEVQFNWYVDGVEVHNAKTKPREEQFNSTFCVVSVLTVVHQDWLNGKEYKCKVSNKGLPAPIEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGKDQDTAIRVFAIPPSFASIFLTKSTKLTCLVTDLTTYDSVTISWTRQNGEAVKTHTNISESHPNATFSAVGEASICEDDWNSGERFTCTVTHTDLASSLKQTISRPKGVALHRPDVYLLPPAREQLNLRESATITCLVTGFSPADVFVQWMQRGQPLSPEKYVTSAPMPEPQAPGRYFAHSILTVSEEEWNTGETYTCVVAHEALPNRVTERTVDKSTGKPTLYNVSLVMSDTAGTCY
配列番号27
ヒトIgG3-ベースのハイブリッドFc蛋白質のアミノ酸配列
EPKSCDTPPPCPRCPAPELLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVQFKWYVDGVEVHNAKTKPREEQYNSTFRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCPVKGFYPSDIAVEWESSGQPENNYNTTPPMLDSDGSFFLYSKLTVDKSRWQQGNIFSCSVMHEALHNRFTQKSLSLSPGKDQDTAIRVFAIPPSFASIFLTKSTKLTCLVTDLTTYDSVTISWTRQNGEAVKTHTNISESHPNATFSAVGEASICEDDWNSGERFTCTVTHTDLASSLKQTISRPKGVALHRPDVYLLPPAREQLNLRESATITCLVTGFSPADVFVQWMQRGQPLSPEKYVTSAPMPEPQAPGRYFAHSILTVSEEEWNTGETYTCVVAHEALPNRVTERTVDKSTGKPTLYNVSLVMSDTAGTCY
配列番号28
ヒトIgG4-ベースのハイブリッドFc蛋白質のアミノ酸配列
ESKYGPPCPSCPAPEFLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSQEDPEVQFNWYVDGVEVHNAKTKPREEQFNSTYRVVRVLTVLHQDWLNGKEYKCKVSNKGLPSSIEKTISKAKGQPREPQVYTLPPSQEEMTKNQVSLTCLVKGFYPSDIAVEWESNGQPEDNYKTTPPVLDSDGSFFLYSRLTVDKSRWQEGNVFSCSVMHEALHNHYTQKSLSLSPGKDQDTAIRVFAIPPSFASIFLTKSTKLTCLVTDLTTYDSVTISWTRQNGEAVKTHTNISESHPNATFSAVGEASICEDDWNSGERFTCTVTHTDLASSLKQTISRPKGVALHRPDVYLLPPAREQLNLRESATITCLVTGFSPADVFVQWMQRGQPLSPEKYVTSAPMPEPQAPGRYFAHSILTVSEEEWNTGETYTCVVAHEALPNRVTERTVDKSTGKPTLYNVSLVMSDTAGTCY
Claims (28)
- ハイブリッドFc蛋白質であって、N末端からC末端の順に、ヒンジ領域の少なくとも一部、CH2及びCH3領域(ここで、それぞれIgGアイソタイプである)を含むIgG Fc領域と、Cμ3及びCμ4領域を含むIgM Fc領域とを含み、
前記ヒンジ領域の少なくとも一部は、(a)抗体可変領域、又は(b)標的に特異的に結合する異種ポリペプチドに連結せず、
前記ハイブリッドFc蛋白質の分子は、前記ヒンジ領域の少なくとも一部内のシステイン残基間の鎖間ジスルフィド結合を介して二重鎖を形成し、前記二重鎖は前記Cμ3及びCμ4領域を介して互いに多量体化できる、ハイブリッドFc蛋白質。 - 前記IgG Fc領域がヒトIgG1、IgG2、IgG3又はIgG4アイソタイプであり、前記Cμ3及びCμ4領域がそれぞれヒトCμ3及びCμ4領域である、請求項1に記載のハイブリッドFc蛋白質。
- 前記ヒンジ領域の少なくとも一部が、25アミノ酸超のポリペプチドに連結されていない、請求項1に記載のハイブリッドFc蛋白質。
- 前記ヒンジ領域の少なくとも一部が、天然抗体においてFc二重鎖の形成に関与しないシステイン残基の置換によって、天然のヒトヒンジ領域と異なる、請求項1に記載のハイブリッドFc蛋白質。
- 前記蛋白質が、本質的に、前記ヒンジ領域の少なくとも一部、前記CH2及びCH3領域、及び前記Cμ3及びCμ4領域、並びに任意に前記ヒンジ領域の少なくとも一部に連結された25アミノ酸までのペプチド、並びに任意にJ鎖からなる、請求項1に記載のハイブリッドFc蛋白質。
- 前記ヒンジ領域の少なくとも一部が、そのN末端にGlu-Pro-Lys-Ser-Ser(配列番号8)のペプチドを含む、請求項1に記載のハイブリッドFc蛋白質。
- 前記IgG Fc領域及び/又は前記IgM Fc領域が、ADCC、ADP又はCDCを低下させるための1つ以上の変異を含む、請求項1のハイブリッドFc蛋白質。
- 前記IgG Fc領域が、FcRn結合を増加させるための1つ以上の変異を含む、請求項1に記載のハイブリッドFc蛋白質。
- 前記IgG Fc領域及び/又は前記IgM Fc領域が、シアリル化を増加させるための1つ以上の変異を含む、請求項1に記載のハイブリッドFc蛋白質。
- 分子あたり2個超のシアル酸残基を有する、請求項1~9のいずれかに記載のハイブリッドFc蛋白質。
- 前記IgG Fc領域の234及び235位(Eu番号付け)がアラニン残基である、請求項1に記載のハイブリッドFc蛋白質。
- 前記IgM Fc領域の433及び435位(Eu番号付け)がそれぞれアラニン残基及びセリン残基である(例えば、配列番号11)、請求項6に記載のハイブリッドFc蛋白質。
- 前記IgG Fc領域の428位(Eu番号付け)がロイシン残基である(例えば、配列番号13)、請求項1~12のいずれかに記載のハイブリッドFc蛋白質。
- 前記IgG Fc領域の241及び/又は243位(Eu番号付け)がアラニン残基である(例えば、それぞれ配列番号15及び16)、請求項1~13のいずれかに記載のハイブリッドFc蛋白質。
- 前記ハイブリッドFc蛋白質の分子が、前記ヒンジ領域の少なくとも一部内のシステイン残基間の鎖間ジスルフィド結合を介して二重鎖を形成しており、前記二重鎖が前記Cμ3及びCμ4領域を介して互いに多量体化している、請求項1~15のいずれかに記載のハイブリッドFc蛋白質。
- 前記多量体がヘキサマーである、請求項14に記載のハイブリッドFc蛋白質。
- ヘキサマーあたり12個超のシアル酸分子を有する、請求項16記載のハイブリッドFc蛋白質。
- 少なくとも99重量%の純度を有する、請求項1~17のいずれかに記載のハイブリッドFc蛋白質。
- 請求項1~18のいずれかに記載のハイブリッドFc蛋白質と、薬学的に許容される担体とを含む、医薬組成物。
- 免疫疾患の治療方法であって、請求項1~18のいずれかに記載のハイブリッドFc蛋白質又は請求項19に記載の医薬組成物の有効なレジメを、それを必要とする対象に投与する工程を含む、方法。
- 前記ハイブリッドFc蛋白質が、循環内のIgG分子の半減期を減少する、請求項20に記載の方法。
- 前記ハイブリッドFc蛋白質が、循環内のIgG分子の濃度を低減する、請求項20に記載の方法。
- 前記ハイブリッドFc融合蛋白質が、B細胞の免疫応答を抑制する、請求項20に記載の方法。
- 前記対象が免疫疾患を有する、請求項20に記載の方法。
- 炎症性疾患、臓器移植後の拒絶反応、血液疾患、皮膚疾患、又は神経筋疾患を治療するための医薬品の生産における、請求項1~18のいずれかに記載のハイブリッドFc蛋白質又は医薬組成物の使用。
- 自己免疫疾患を治療するための医薬品の生産における、請求項1~18のいずれかに記載のハイブリッドFc蛋白質又は医薬組成物の使用。
- 前記疾患が、特発性血小板減少性紫斑病、川崎病、ギランバレー症候群、又は慢性炎症性脱髄性ポリニューロパシーである、請求項26に記載の使用。
- 前記疾患が、全身性エリテマトーデス、多発性硬化症、又は自己免疫性好中球減少症である、請求項26に記載の使用。
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US20220002361A1 (en) | 2022-01-06 |
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