JP6245707B2 - [18f]fまたは蛍光色素で標識されたpeg化生物活性物質の製造方法、ならびにその体内動態解析 - Google Patents
[18f]fまたは蛍光色素で標識されたpeg化生物活性物質の製造方法、ならびにその体内動態解析 Download PDFInfo
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- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003729 cation exchange resin Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229930002875 chlorophyll Natural products 0.000 description 1
- 235000019804 chlorophyll Nutrition 0.000 description 1
- ATNHDLDRLWWWCB-AENOIHSZSA-M chlorophyll a Chemical compound C1([C@@H](C(=O)OC)C(=O)C2=C3C)=C2N2C3=CC(C(CC)=C3C)=[N+]4C3=CC3=C(C=C)C(C)=C5N3[Mg-2]42[N+]2=C1[C@@H](CCC(=O)OC\C=C(/C)CCC[C@H](C)CCC[C@H](C)CCCC(C)C)[C@H](C)C2=C5 ATNHDLDRLWWWCB-AENOIHSZSA-M 0.000 description 1
- 229940125900 compound 59 Drugs 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 229960000956 coumarin Drugs 0.000 description 1
- 235000001671 coumarin Nutrition 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003013 cytotoxicity Effects 0.000 description 1
- 231100000135 cytotoxicity Toxicity 0.000 description 1
- 239000000032 diagnostic agent Substances 0.000 description 1
- 229940039227 diagnostic agent Drugs 0.000 description 1
- 238000009509 drug development Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- BJXYHBKEQFQVES-NWDGAFQWSA-N enpatoran Chemical compound N[C@H]1CN(C[C@H](C1)C(F)(F)F)C1=C2C=CC=NC2=C(C=C1)C#N BJXYHBKEQFQVES-NWDGAFQWSA-N 0.000 description 1
- 239000002532 enzyme inhibitor Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 235000019439 ethyl acetate Nutrition 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- GVEPBJHOBDJJJI-UHFFFAOYSA-N fluoranthrene Natural products C1=CC(C2=CC=CC=C22)=C3C2=CC=CC3=C1 GVEPBJHOBDJJJI-UHFFFAOYSA-N 0.000 description 1
- GNBHRKFJIUUOQI-UHFFFAOYSA-N fluorescein Chemical compound O1C(=O)C2=CC=CC=C2C21C1=CC=C(O)C=C1OC1=CC(O)=CC=C21 GNBHRKFJIUUOQI-UHFFFAOYSA-N 0.000 description 1
- 238000010353 genetic engineering Methods 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 239000001963 growth medium Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229940088597 hormone Drugs 0.000 description 1
- 239000005556 hormone Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 239000002502 liposome Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- YGBMCLDVRUGXOV-UHFFFAOYSA-N n-[6-[6-chloro-5-[(4-fluorophenyl)sulfonylamino]pyridin-3-yl]-1,3-benzothiazol-2-yl]acetamide Chemical compound C1=C2SC(NC(=O)C)=NC2=CC=C1C(C=1)=CN=C(Cl)C=1NS(=O)(=O)C1=CC=C(F)C=C1 YGBMCLDVRUGXOV-UHFFFAOYSA-N 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-N naphthalene-1-sulfonic acid Chemical compound C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-N 0.000 description 1
- 230000000269 nucleophilic effect Effects 0.000 description 1
- 229920001542 oligosaccharide Polymers 0.000 description 1
- 150000002482 oligosaccharides Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 150000002923 oximes Chemical class 0.000 description 1
- 108010048732 pegylated erythropoietin Proteins 0.000 description 1
- 229940056360 penicillin g Drugs 0.000 description 1
- JGTNAGYHADQMCM-UHFFFAOYSA-N perfluorobutanesulfonic acid Chemical compound OS(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F JGTNAGYHADQMCM-UHFFFAOYSA-N 0.000 description 1
- 230000001766 physiological effect Effects 0.000 description 1
- 239000002504 physiological saline solution Substances 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 150000003141 primary amines Chemical class 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000012429 reaction media Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000000384 rearing effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000002464 receptor antagonist Substances 0.000 description 1
- 229940044551 receptor antagonist Drugs 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- JBJWASZNUJCEKT-UHFFFAOYSA-M sodium;hydroxide;hydrate Chemical compound O.[OH-].[Na+] JBJWASZNUJCEKT-UHFFFAOYSA-M 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- WUQCROHHFVTNFE-UHFFFAOYSA-N sulfuryl diazide;hydrochloride Chemical compound Cl.[N-]=[N+]=NS(=O)(=O)N=[N+]=[N-] WUQCROHHFVTNFE-UHFFFAOYSA-N 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- AAAQKTZKLRYKHR-UHFFFAOYSA-N triphenylmethane Chemical compound C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 AAAQKTZKLRYKHR-UHFFFAOYSA-N 0.000 description 1
- 239000012588 trypsin Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/329—Polymers modified by chemical after-treatment with organic compounds
- C08G65/333—Polymers modified by chemical after-treatment with organic compounds containing nitrogen
- C08G65/33396—Polymers modified by chemical after-treatment with organic compounds containing nitrogen having oxygen in addition to nitrogen
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
- A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
- A61K51/04—Organic compounds
- A61K51/041—Heterocyclic compounds
- A61K51/044—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine, rifamycins
- A61K51/0453—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine, rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
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- C07D—HETEROCYCLIC COMPOUNDS
- C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
- C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
- C07D403/06—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings linked by a carbon chain containing only aliphatic carbon atoms
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- C07D—HETEROCYCLIC COMPOUNDS
- C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
- C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
- C07D487/04—Ortho-condensed systems
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/329—Polymers modified by chemical after-treatment with organic compounds
- C08G65/333—Polymers modified by chemical after-treatment with organic compounds containing nitrogen
- C08G65/33303—Polymers modified by chemical after-treatment with organic compounds containing nitrogen containing amino group
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- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/329—Polymers modified by chemical after-treatment with organic compounds
- C08G65/337—Polymers modified by chemical after-treatment with organic compounds containing other elements
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Description
(デオキシフルオロPEG化合物)
本発明のデオキシフルオロPEG化合物は、前記式(II-a’)で表される。このデオキシフルオロPEG化合物は、次のようにして合成することができる。
(蛍光色素含有PEG化合物)
前記式(II-b)で表わされる蛍光色素含有PEG化合物は、前記式(II-b-1)で表される化合物と、この式(II-b-1)で表される化合物のアミノ基と反応する官能基を有する蛍光色素とを反応させることで合成することができる。
(環状アセチレン化合物)
前記式(III)で表わされる環状アセチレン化合物は、前記式(III-1-1)で表わされる環状アセチレン化合物と、前記式(III-1-2)で表わされるマレイミド化合物とを反応させて合成することができる。
([18F]Fで標識されたPEG化生物活性物質)
前記式(I-a)で表わされる、[18F]Fで標識されたPEG化生物活性物質は、前記式(II-a)で表わされる[18F]フルオロPEG化合物と、前記式(III)で表わされる環状アセチレン化合物とを、生理的条件下(水溶液中、室温、かつ銅触媒の不存在下)に反応させることで合成することができる。
(蛍光標識されたPEG化生物活性物質)
前記式(I-b)で表わされる、蛍光標識されたPEG化生物活性物質は、前記式(II-b)で表わされる蛍光色素含有PEG化合物と、前記式(III)で表わされる環状アセチレン化合物とを、生理的条件下(水溶液中、室温、かつ銅触媒の不存在下)に反応させることで合成することができる。
<実施例1〜3> アジド基を有する官能基化された新規PEGの合成
市販されている末端にアミノ基を有するPEG(2kDa, 58)を出発原料とし、Goddard-Borgerらの手法を用いて末端アミノ基をアジド化し59を得た。続いて末端水酸基をトシル化し60を得た。なお、本発明者らが開発した陽イオン及び陰イオン交換樹脂を用いるPEGの精製法を応用することで極性の高いPEG誘導体60でも効率よく単離することができた。最後にnBu4NFを用いてフッ素化することで目的とするPEG 52を3工程79%の収率で得た。精製は同様にイオン交換樹脂を用いた。
化合物59の合成
1H NMR (500 MHz, CDCl3) : 1.85 (2 H, quint, J = 6.5 Hz), 3.39 (2 H, t, J = 6.5 Hz), 3.48-3.79 (ca.200 H, m). 13C NMR (500 MHz, CDCl3) : 29.0, 48.4, 61.4, 67.8, 70.1, 70.3, 70.4, 70.5, 72.8. IR (CHCl3) : 2099 cm-1.
MS (MALDI-TOF): m/z calcd for C89H179N3O44K [M (n=43) + K]+: 2033.1499, found: 2033.2044.
化合物60の合成
1H NMR (500 MHz, CDCl3) : 1.84 (2 H, quint, J = 6.5 Hz), 2.44 (3 H, s), 3.38 (2 H, t, J = 6.5 Hz), 3.48-3.78 (ca.200 H, m), 4.14 (2 H, t, J = 5.0 Hz), 7.33 (2 H, d, J = 8.0 Hz), 7.78 (2 H, d, J = 8.0 Hz). 13C NMR (500 MHz, CDCl3) : 21.6, 29.1, 48.4, 67.8, 68.6, 69.2, 70.3, 70.5, 70.7, 127.9, 129.8, 132.9, 144.7. IR (CHCl3) : 2099 cm-1.
MS (MALDI-TOF): m/z calcd for C94H181N3O45SK [M (n=42) + K]+: 2143.1325, found: 2143.3302.
<実施例2>
化合物52の合成
1H NMR (500 MHz, CDCl3) : 1.84 (2 H, quint, J = 6.5 Hz), 3.38 (2 H, d, J = 6.5 Hz), 3.47-3.78 (ca.200 H, m), 4.55 (2 H, td, J = 4.5, 52.0 Hz). 13C NMR (500 MHz, CDCl3) : 29.1, 48.4, 67.8, 70.3, 70.5, 70.7, 83.1 (d, J = 168 Hz). 19F NMR (470 MHz, CDCl3) : -223 (tt, J = 29, 47 Hz)
IR (CHCl3) : 2099 cm-1
MS (MALDI-TOF): m/z calcd for C89H178N3O43FK [M (n=43) + K]+: 2035.1455, found: 2035.2070.
<実施例3>
化合物64の合成
市販されている58のアミノ基を保護し、水酸基をトシル化することで62を2工程89%の収率で得た。続いて求核的にアジドを導入し、アミノ基を脱保護することで目的のPEG 64を定量的に得た。なお、各工程における精製はイオン交換樹脂や低極性溶媒による洗浄を行うことで精製困難なPEGを効率よく単離した。
1H NMR (400 MHz, CDCl3) : 1.40 (9 H, s), 1.72 (2 H, quint, J = 6 Hz), 2.42 (3 H, s), 3.18 (2 H, dd, J = 12, 6 Hz), 3.47-3.78 (ca.200 H, m), 4.12 (2 H, t, J = 5 Hz), 7.32 (2 H, d, J = 8 Hz), 7.76 (2 H, d, J = 8 Hz).
HRMS (MALDI-TOF): m/z calcd for C101H195NO48SK [M (n=43) + K]+: 2261.2206, found: 2261.2132.
化合物63の合成
1H NMR (500 MHz, CDCl3) : 1.41 (9 H, s), 1.73 (2 H, quint, J = 6 Hz), 3.19 (2 H, dd, J = 13, 6 Hz), 3.37 (2 H, t, J = 5 Hz) 3.47-3.78 (ca.200 H, m)
HRMS (MALDI-TOF): m/z calcd for C94H188N4O45K [M (n=43) + K]+: 2132.2183, found: 2132.2180.
化合物64の合成
1H NMR (500 MHz, D2O/CDCl3) : 2.00-2.10 (2 H, m), 3.19 (2 H, t, J = 5 Hz), 3.39 (2 H, t, J = 5 Hz) 3.47-3.78 (ca.200 H, m).
HRMS (MALDI-TOF): m/z calcd for C89H180N4O43K [M (n=43) + K]+: 2032.1658, found: 2032.1563.
続いて64と775nmに最大蛍光発光を持つAlexa Fluor 750を結合した。
<実施例4>
64と647nmに最大蛍光発光を持つAlexa Fluor 647を結合し、56aを合成した。
<実施例5、6> 高反応性シクロオクチンの合成
側鎖末端にマレイミド基を有する高反応性シクロオクチンを合成した。
<実施例5>
側鎖末端にマレイミド基を有する高反応性シクロオクチン(72, 79)を合成した。まず、dibenzosuberenoneに塩酸ヒドロキシルアミンを反応させオキシム68を定量的に得た。続いて徳山らのDIBALを過剰に用いるBeckman転位及びアミドの還元反応(Cho, H.; Iwama, Y.; Sugimoto, K.; Mori, S.; Tokuyama, H.J. Org. Chem. 2010, 75, 627-636.)を68に適用し、8員環アミン69を80%の収率で得た。
73(212 mg, 0.623 mmol)、78(290 mg, 1.87 mmol)をTHF(5.5 ml)及びNaHCO3水(5.5 ml)の混合液に溶かし、室温で30分間撹拌した。NH4Cl sat.を加え、CH2Cl2で抽出した。有機層を無水MgSO4で乾燥し、溶媒を減圧留去した。残渣をカラムクロマトグラフィー(hexane-EtOAc, 1:1)で精製し79(139 mg, 62%)を得た。
1H NMR (300 MHz, CDCl3) : 2.18-2.31 (1 H, m), 2.46-2.55 (1 H, m), 3.64 (1 H, d, J = 14 Hz), 3.54-3.63 (1 H, m), 3.68-3.80 (1 H, m), 5.14 (1 H, d, J = 14 Hz), 6.53 (1H, s), 7.22-7.41 (7 H, m), 7.69 (1 H, d, J = 7 Hz).
HRMS (MALDI-TOF): m/z calcd for C22H16N2O3Na [M + Na]+: 379.1053, found: 379.1052.
<実施例6>
PEG (Mw 2kDa)を導入したシクロオクチン81を合成した。すなわち、末端にカルボキシル基とアミノ基を有する市販のPEG 80を出発原料とし、先ほどと同様にしてマレイミド基を導入した。続いてカルボキシル基をNHSで活性エステルとし、アミン73と反応させ81を3工程64%の収率で得た。
<実施例7〜11> PEG化ペプチドの体内動態を可視化する分子の合成
<実施例7>
化合物82の合成
最初に、前記において合成したアジドPEG 52とアルキン79を用いてHuisgen反応を検討した。
化合物83の合成
79 (0.2 mg, 0.56 μmol)、cyclo-RGDfC-SH (0.50 μmol)をDMF(70 μl)とNaHCO3水(0.10 M, 70 μl)の混合液に溶かし、室温で24時間撹拌した。HPLC (5C18-AR-II, 4.6×250 mm, MeCN : H2O = 1 : 1, 流速1.0mLmin-1,検出: UV 254 nm)にて分析し、79ならびにcyclo-RGDfC-SHとは異なる新しいピーク(保持時間3.3分)を分取して化合物83を得た。
HRMS (MALDI-TOF): m/z calcd for C46H51N10O10S [M + H]+: 935.3505, found: 935.3492.
対照化合物として、cyclo-RGDfC-SHの代わりにドデカンチオールを導入した84を同様にして合成した。
1H NMR (300 MHz, CDCl3) : 0.88 (3 H, t, J = 7 Hz), 1.21-1.37 (18 H, m), 1.44-1.70 (2 H, m), 2.19 (1 H, sext, J = 8 Hz), 2.36 (1 H, dt, J = 19, 3 Hz), 2.42-2.84 (3 H, m), 2.94 (1 H, ddd, J = 22, 19, 9 Hz), 3.46-3.75 (3 H, m), 3.64 (1 H, d, J = 14 Hz), 5.14 (1 H, d, J = 14 Hz), 7.26-7.41 (7 H, m), 7.69 (1 H, d, J = 7 Hz).
HRMS (MALDI-TOF): m/z calcd for C34H43N2O3S [M + H]+: 559.2989, found: 559.2989.
<実施例10>
83と56のHuisgen反応による結合を試みた。その結果、83は速やかに消失し、化合物85が得られた(図3)。
<実施例11>
83と56aのHuisgen反応を行い、化合物85aを得た。
<実施例12>
バックグラウンド用として84と56のHuisgen反応により86を合成した。700nmで検出したところ56が消失し、保持時間11.5分の新しいピークがAlexa Fluor付加体86であると考えられる(図5)。また、ピーク面積を基に収率は52%と推定した。
<実施例13>
対照化合物として、cyclo-RGDfCの代わりにドデカンチオールが結合した86aを同様にして合成した。
84 (図6) (32 nmol)と56a(8 nmol) のDMF(12.5 μl)溶液を室温で70分間撹拌した。HPLC (5C18-AR-II 4.6×250 mm, MeCN:H2O = 5 : 95 (0 min) →5 : 95 (5 min) →50 : 50 (15 min) →50 : 50 (25 min) → 95 : 5 (30 min) → 100 : 0 (35 min), 流速1.0 mL min-1, 検出: UV 254 nm, 650 nm及びコロナ荷電化粒子検出器、図7A,B参照) の保持時間(21分)のピークを分取し、86aを得た。
<実施例14>
RGDfC-PEG(85a)のin vivoイメージング
1. 実験材料
各サンプル: RGDfC-PEG(85a), control-PEG(86a)
クロロフィルを含まないマウス飼育用飼料:オリエンタル酵母工業(株)
イソフルラン(エスカイン<登録商標>):メルク製薬(株)
insuflon<登録商標>:Unomedical
2. 実験方法
(がん細胞の培養)
移植がん細胞としてA549ヒト肺がん細胞株を用いた。培養培地としては、D-MEM/Ham’s F-12にペニシリンG(100 unit/mL)、ストレプトマイシン溶液(100 μg/mL)を加えたものに、非働化ウシ胎児血清(Fetal bovine serum:FBS)を加えて調製した10% FBS D-MEM/Ham’s F-12 (P/S+)を用いた。インキュベーター内で5% CO2存在下37oCで培養し、コンフルエント時には、0.25% Trypsin/EDTA-PBS(-)溶液で細胞を剥離し、継代を行った。
(担がんマウスの作製)
実験動物には5週齢の雄性BALB/c nu/nu マウス(日本SLC)を用いた。マウスは、クロロフィルを含まない飼料を与えて飼育し、イメージング時のバックグラウンドを低減した。
(サンプル調製)
各サンプル[RGDfC-PEG (85a), control-PEG (86a)]を10 nmol / mLとなるように、適量の生理食塩水にて用時溶解した。
(in vivoイメージング)
担がんマウスの尾静脈内にカニューレ(insuflon<登録商標>)を挿入後、専用チャンバー内でイソフルラン(エスカイン<登録商標>)を用いてマウスを麻酔した。マウスをIVIS Lumina Imaging System(Xenogen社)の装置内に固定後、調製した各サンプル(2 nmol / 0.2 mL / mouse)を尾静脈内投与した。投与直後から各サンプルに含まれるAlexa647の蛍光を非侵襲的にイメージングした。投与3時間後にマウスを解剖し、血液、各臓器、および腫瘍への85a, 86aの分布をIVISにてex vivoイメージングした。
3. 実験結果
A549ヒト肺がん細胞移植マウスに投与したcontrol-PEG(86a) あるいはRGDfC-PEG(85a) の体内動態をAlexa647の蛍光によってin vivoイメージングした結果を図8A,Bに示す。いずれのサンプルにおいても腎臓から膀胱へと移行していく様子が観察された。投与3時間後にマウスを解剖し、血液、各臓器、および腫瘍への86a, 85aの分布をIVISにてex vivoイメージングした結果を図9に示す。この結果から、RGDfC-PEG(85a)の腎臓および腫瘍への顕著な集積が観察された。したがって、RGDfC-PEG(85a)は腫瘍のイメージングに有用であることが示唆された。
<実施例15>
<実施例16>
81 (0.26 μmol)をMeCN (0.5ml) に溶解し、52 (0.19 μmol)を加えて室温で120分間撹拌した。HPLC (5C18-AR-II 4.6×250 mm, MeCN:H2O = 1 : 1, 流速0.4 mL min-1, 検出: UV 254 nm及びコロナ荷電化粒子検出器、図11A,B参照) の保持時間(14分)のピークを分取し、88を得た。なお、HPLCでは81は8min, 52と88はいづれも14minに現れる。88と52が重なり、反応の終点を判断することはできなかったので、念のために120分間、反応を行った。
MS (MALDI-TOF): m/z calcd for C200H371N6O88FNa [M (n1 = n2 =42) + Na]+: 4307.4622, found: 4307.3684.
<実施例17>
89 (2.2 μmol)のMeCN (0.4ml)溶液にK2CO3 (0.6 mg, 4.4 μmol)を加えた後、dodecanethiol のMeCN溶液(24 mM)を0.1 ml加え、反応液を室温で220分間撹拌した。粗生成物(化合物90)はそのまま次の反応に用いた。
HRMS (MALDI-TOF): m/z calcd for C111H211N3O50SK [M (n = 42) + K]+: 2457.3413, found: 2457.3437.
<実施例18>
90 (4.0×102 μmol)のCH2Cl2 (0.25 ml)溶液に73のCH2Cl2 溶液(36 mM)を17.5 μl加え、室温で15分間撹拌し、化合物91を得た。
HRMS (MALDI-TOF): m/z calcd for C127H226N4O49SK [M (n = 43) + K]+: 2662.4668, found: 2662.4610.
Claims (16)
- 次式(I-a):
- 請求項1に記載のPEG化生物活性物質を製造する方法であって、次式(II-a):
- 次式(I-b):
- 請求項3に記載のPEG化生物活性物質を製造する方法であって、次式(II-b):
- 次式(II-a’):
- 式(II-a’)のFが、18Fである請求項5に記載のデオキシフルオロPEG化合物。
- 次式(II-b):
- 次式(II-c):
- 請求項6に記載のデオキシフルオロPEG化合物の製造方法であって、次式(II-c):
- 請求項7に記載の蛍光色素含有PEG化合物の製造方法であって、次式(II-b-1):
- 次式(III):
- 次式(III-1):
- 請求項12に記載の環状アセチレン化合物の製造方法であって、次式(III-1-1):
- 請求項11に記載の環状アセチレン化合物の製造方法であって、次式(III-1):
- 請求項1に記載の[18F]Fで標識されたPEG化生物活性物質の体内動態をポジトロン断層法(PET)によってリアルタイムに非侵襲的かつ定量的に解析する方法。
- 請求項3に記載の蛍光標識されたPEG化生物活性物質の体内動態を蛍光検出法によってリアルタイムに非侵襲的かつ定量的に解析する方法。
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