JP5429804B2 - 体内に存在する病因物質の低下剤 - Google Patents
体内に存在する病因物質の低下剤 Download PDFInfo
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- JP5429804B2 JP5429804B2 JP2009534176A JP2009534176A JP5429804B2 JP 5429804 B2 JP5429804 B2 JP 5429804B2 JP 2009534176 A JP2009534176 A JP 2009534176A JP 2009534176 A JP2009534176 A JP 2009534176A JP 5429804 B2 JP5429804 B2 JP 5429804B2
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- dextran sulfate
- bond
- ldl
- blood
- antibody
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Description
このことから、血中又はリンパ液中に存在する病因物質の吸着剤と、当該病因物質を代謝又は排泄する能力を有する臓器又は細胞に特異的なリガンドとをリンカーを介して又は介さずに結合させた化合物は、血中又はリンパ液中の病因物質レベルの低下剤として利用でき、その結果当該病因物質による疾患の治療が可能になることを見出し、本発明を完成するに至った。
また本発明は、当該化合物を有効成分とする、血中又はリンパ液中に存在する病因物質の体内レベル低下剤を提供するものである。
また、本発明は、当該化合物を有効成分とする、血中又はリンパ液中に存在する病因物質に起因する疾患の予防及び/又は治療剤を提供するものである。
また本発明は、当該化合物及び薬学的に許容される担体を含有する、血中又はリンパ液中に存在する病因物質に起因する疾患の予防及び/又は治療用医薬組成物を提供するものである。
また、本発明は、血中又はリンパ液中に存在する病因物質に起因する疾患の予防及び/又は治療薬製造のための、当該化合物の使用を提供するものである。
また本発明は、血中又はリンパ液中に存在する病因物質低下剤製造のための、当該化合物の使用を提供するものである。
また、本発明は、当該化合物の有効量を投与することを特徴とする、血中又はリンパ液中に存在する病因物質の体内レベル低下方法を提供するものである。
さらに本発明は、当該化合物の有効量を投与することを特徴とする、血中又はリンパ液中に存在する病因物質に起因する疾患の予防及び/又は治療方法を提供するものである。
以下に、デキストラン硫酸にガラクトースを導入する場合の反応例を示す。
ここで、活性化剤とは水酸基を活性化させるために使用される試薬であれば制限はなく、例えばカルボニルジイミダゾール(CDI)、N,N’−ジサクシイミジルカルボネート(DSC)等が挙げられ、イミダゾールカルバメート基、およびサクシイミジルカルバメート基が導入される。反応溶媒は、ホルムアミド、DMSO等を使用することができる。反応温度は0〜40℃で行うことができ、25〜37℃で行うことが好ましい。反応時間は0.5〜12時間、特に1〜3時間が好ましい。
ここで、アルキレンジアミンとしては、直鎖で炭素数1〜100のものを使用することができ、好ましくは炭素数3〜50のアルキレンジアミンを使用することが好ましい。反応溶媒は、ホルムアミド、DMSO等を使用することができる。反応温度は0〜40℃で行うことができ、25〜37℃で行うことが好ましい。反応時間は0.5〜24時間、特に5〜16時間が好ましい。
また、工程1と工程2はワンポットで同時に行ってもよい。
ここで、活性化剤は前記と同様である。反応溶媒は、ホルムアミド、DMSO等を使用することができる。反応温度は0〜40℃で行うことができ、25〜37℃で行うことが好ましい。反応時間は0.5〜12時間、特に1〜3時間が好ましい。
ここで、反応溶媒は、ホルムアミド、DMSO等を使用することができる。反応温度は0〜40℃で行うことができ、25〜37℃で行うことが好ましい。反応時間は0.5〜24時間、特に15〜21時間が好ましい。
ここで、還元剤は、抗体のジスルフィド結合を切断できる試薬を指し、特に2−メルカプトエチルアミンやジチオスレイトール等を使用することが好ましい。反応時間は、30分から12時間で行うことができ、60分〜90分で行うことが好ましい。また、反応温度は4〜40℃、特に30〜40℃が好ましい。
ここで、活性化剤としてはアミノ基を活性化させるために使用される試薬であれば制限はなく、例えばスルホサクシイミジル4−(N−マレイミドメチル)シクロヘキサン−1−カルボキシレート(sulfo−SMCC)、N−サクシイミジル(4−ヨードアセチル)アミノベンゾエート等が挙げられる。反応溶媒は、水、DMSO等を使用することができる。反応温度は0〜50℃で行うことができ、25〜37℃で行うことが好ましい。反応時間は0.5〜12時間、特に1〜5時間が好ましい。
ここで、反応溶媒はDMSO、緩衝液を使用することができる。反応温度は0〜50℃で行うことができ、25〜37℃で行うことが好ましい。反応時間は0.5〜72時間、特に12〜40時間が好ましい。F(ab’)2抗体1モルに対してデキストラン硫酸を1000〜2000モル反応させることが好ましい。
ここで、活性化剤としてはアミノ基を活性化させるために使用される試薬であれば制限はなく、例えばジサクシイミジル タータレート(DST)、グリコビス(サクシイミジルサクシネート)(EGS)等が挙げられる。反応溶媒は、水、DMSO等を使用することができる。反応温度は0〜50℃で行うことができ、25〜37℃で行うことが好ましい。反応時間は0.5〜12時間、特に1〜3時間が好ましい。
ここで、反応溶媒としてはDMSO、緩衝液を使用することができる。反応温度は0〜50℃で行うことができ、4〜37℃で行うことが好ましい。反応時間は、0.5〜72時間、特に12〜40時間が好ましい。プロテインAに対して、デキストラン硫酸を0.5〜100モル反応させることが好ましい。
25mLの溶媒ホルムアミド中に、分子量3万6千〜5万の可溶性デキストラン硫酸(125mg、2.5〜3.4μmol)、リンカー分子として1,6−ヘキサメチレンジアミンを67.4(mg)(581μmol)、及び活性化剤として、1,1’−カルボニルジイミダゾール(78mg、484μmol)を添加し、37℃、19時間反応し、デキストラン硫酸の側鎖の水酸基に対してリンカー1,6−ヘキサメチレンジアミンを導入した。
次いで、10mLのホルムアミド中にD−(+)−ガラクトース(34.7mg、193μmol)を添加し、活性化剤として1,1’−カルボニルジイミダゾール(37.5mg、232μmol)を添加し、37℃、2時間反応させた。その後、ヘキサメチレンジアミンを導入したデキストラン硫酸(56mg、1.1〜1.5μmol)添加して、37℃、21時間反応させ、定法により精製・単離し、標題の化合物(33mg、0.6〜0.9μmol、収率55%)を得た。
実施例1で合成した薬剤の毒性や有効性を調べるため、LDL受容体・アポEダブルノックアウトマウス(n=2)に対して2g/Lのデキストラン硫酸−ガラクトース溶液(0.1mL)および、コントロールとして2g/Lのデキストラン硫酸溶液(0.1mL)を1回頸動脈より注射し、血中コレステロール値をコレステロールオキシダーゼ・DAOS法によりモニターした。その結果を、図1に示す。
図1から、デキストラン硫酸−ガラクトース修飾体を投与した群においてのみ、2日にわたって、コントロール(非修飾デキストラン硫酸の投与群)に比較して、優位な血中コレステロール値の低下が認められた。
ペプシン酵素固定化樹脂を20mMの酢酸緩衝液(pH4.5)により洗浄し、1mLの酢酸緩衝液(pH4.5)に懸濁させ、ベータ2ミクログロブリン抗体50μgを添加し、37℃で24時間インキュベートした。その後、15000rpmで3分間遠心し、上澄み1mLを回収し、100mMのトリス−塩酸緩衝液(pH8.0)を30μL加えて中和させた。その後、プロテインA固定化カラムに未反応物を精製し、F(ab’)2抗体を得た。次いで、得られたF(ab’)2抗体190μgに対して、2−メルカプトエチルアミンを12mg加え、PBSで1mLとした。37℃で2時間インキュベートした後に、セファデックスG−25カラムで精製し、限外濾過膜(3kDaカット)を用いて濃縮してF(ab’)2還元型抗体溶液を500μL得た。
次いで、実施例1で示した条件と同様の手順により作製したヘキサメチレンジアミンを導入したデキストラン硫酸(72mg、1.0〜1.3μmol)に対して、sulfoSMCC(100mg,229μmol)を添加し、15mLのリン酸緩衝液中で37℃、5時間反応させ、限外濾過膜(3kDaカット)により濃縮後、アミノ基を活性化したデキストラン硫酸500μLを得た。その後、F(ab’)2還元型抗体溶液を500μLと混合し、37℃で40時間反応させた。その後5mMのシステイン溶液を当量加えて、37℃で5時間反応させた後に、限外濾過膜により反応物を濃縮し標題の化合物(79μg(BCA法によるタンパク定量より算出))を得た。図2に、合成したデキストラン硫酸−ベータ2ミクログロブリン抗体をSDS−PAGEにより泳動した結果を示す。
ヒト肝細胞であるHepG2細胞を96穴プレートに4.5×103個/穴の密度で播種し、24時間インキュベートした。その後、培地1mLに低密度リポプロテイン(LDL)(0.1μg、1.8pmol)とフルオレセイン修飾ベータ2ミクログロブリン(F−βIIMG)(31μg、2.6nmol)、合成したデキストラン硫酸−ベータ2ミクログロブリン抗体(DexS−βIIMG)(2.3μg、26nmol)を加えて、96穴プレートに添加し、37℃で3時間インキュベートした。その後、細胞を100μLのリン酸緩衝液で洗浄した後、細胞を溶解させてその溶液の蛍光強度を測定した。その結果を図3に示す。
図3より、コントロールとなるLDLが添加されてない培地およびデキストラン硫酸−ベータ2ミクログロブリン抗体が添加されてない培地に比べて、LDLおよびデキストラン硫酸−ベータ2ミクログロブリン抗体が添加された培地の場合では、細胞内へベータ2ミクログロブリンが多く取り込まれることが認められた。つまり、ベータ2ミクログロブリンは、LDL−デキストラン硫酸−ベータ2ミクログロブリン抗体複合体によりHepG2細胞へ特異的に取り込まれたことがわかる。
実施例1で示した条件と同様の手順により作製したヘキサメチレンジアミンを導入したデキストラン硫酸(1.4mg、23nmol、アミノ化率61.3%/ユニット)に対して、DST(4.4mg、12.88μmol)を添加し、200μLの0.2M炭酸ナトリウム酸緩衝(pH9.4)中で室温、1時間反応させ、限外濾過膜(30kDa)により精製・濃縮後、アミノ基を活性化したデキストラン硫酸250μLを得た。その後、プロテインA溶液を100μL(1mg、23nmol)と混合し、37℃で40時間反応させた。その後、限外濾過膜(50kDa)により精製し反応物を濃縮し標題の化合物(169μg(BCA法によるタンパク定量より算出))を得た。図4に、合成したデキストラン硫酸−プロテインAをSDS−PAGEにより泳動した結果を示す。
ヒト肝細胞であるHepG2細胞を96穴プレートに4.5×103個/穴の密度で播種し、24時間インキュベートした。その後、低密度リポプロテイン不含血清10%を含む培地(LDL不含培地)を100μL加えて、3時間あるいは24時間インキュベートした。その後、LDL不含培地1mLに低密度リポプロテイン(LDL)(0.1μg、1.8pmol)とフルオレセイン修飾ウサギ抗マウスIgG抗体(27.3μg、182pmol)、合成したデキストラン硫酸-プロテインA(2.04μg、18.2pmol)を加えて、96穴プレートに100μL加えて37℃で3時間インキュベートした。その後、細胞を100μLのリン酸緩衝液で洗浄し、細胞を溶解させてその溶液の蛍光強度を測定した。その結果を図5に示す。
図5より、デキストラン硫酸−プロテインAが添加されていない培地、およびLDLが添加されていない培地に比べて、LDLおよび合成したデキストラン硫酸−プロテインAが添加された培地では、有意に蛍光修飾抗体の取り込みが増加していることがわかる。つまり、合成したデキストラン硫酸−プロテインAは、LDL−デキストラン硫酸−プロテインA複合体形成により、抗体をHepG2細胞へ特異的に取り込ませる能力があることがわかる。
Claims (10)
- (A)デキストラン硫酸又はその塩の水酸基と、(B)ガラクトース、ラクトース、モノガラクトシルジアシルグリセロール、アガロース及びカラギーナンから選ばれるアシアロオロソムコイドレセプターリガンドとを、ジアミン又はグリコールの両端にカルボニル基を有するリンカーを介して結合させてなる薬剤。
- (B)アシアロオロソムコイドレセプターリガンドがガラクトースである請求項1記載の化合物。
- (A)デキストラン硫酸又はその塩の水酸基と抗ベータ2ミクログロブリン抗体とをジアミン又はグリコールの両端にカルボニル基を有するリンカーを介して修飾された抗ベータ2ミクログロブリン抗体と、(B)LDLとを、ジアミン又はグリコールの両端にカルボニル基を有するリンカーを介して又は介さずしてアミド結合、ウレタン結合、尿素結合、エステル結合、ジスルフィド結合若しくはエーテル結合の形成反応、イオン性結合又は疎水性相互作用により結合させてなる薬剤。
- (A)デキストラン硫酸又はその塩の水酸基とプロテインAとをジアミン又はグリコールの両端にカルボキシル基を有するリンカーを介して修飾されたプロテインAと、(B)LDLとを、ジアミン又はグリコールの両端にカルボニル基を有するリンカーを介して又は介さずしてアミド結合、ウレタン結合、尿素結合、エステル結合、ジスルフィド結合若しくはエーテル結合の形成反応、イオン性結合又は疎水性相互作用により結合させてなる薬剤。
- 請求項1又は2に記載の薬剤を有効成分とする血中LDL低下剤。
- 請求項3に記載の薬剤を有効成分とする血中ベータ2ミクログロブリン低下剤。
- 請求項4に記載の薬剤を有効成分とする血中抗体低下剤。
- 請求項1又は2に記載の薬剤を有効成分とする高脂血症の予防及び/又は治療剤。
- 請求項3に記載の薬剤を有効成分とする透析アミロイドーシスの予防及び/又は治療剤。
- 請求項4に記載の薬剤を有効成分とする特発性拡張型心筋症の予防及び/又は治療剤。
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