JP7390740B2 - 腫瘍の治療及び/又は予防のための組成物 - Google Patents
腫瘍の治療及び/又は予防のための組成物 Download PDFInfo
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Description
(1)被験体における腫瘍の治療及び/又は予防のための、同種CD4+T細胞を含む組成物であって、
前記同種CD4+T細胞が、(a)前記被験体のMHCクラスII分子と全部又は一部が異なるMHCクラスII分子を有し、かつ(b)前記被験体又は前記被験体のMHCクラスII分子と完全一致又は部分一致するMHCクラスII分子を有する個体に由来する抗原提示細胞とex vivoで共培養した細胞を含む、前記組成物。
(2)前記抗原提示細胞が樹状細胞である、(1)に記載の組成物。
(3)腫瘍内投与のための、(1)又は(2)に記載の組成物。
(4)同種CD4+T細胞を、前記被験体又は前記被験体のMHCクラスII分子と完全一致又は部分一致するMHCクラスII分子を有する個体に由来する抗原提示細胞とex vivoで共培養する工程を含む、(1)~(3)のいずれかに記載の組成物の製造方法。
本明細書は本願の優先権の基礎となる日本国特許出願番号2019-199195号の開示内容を包含する。
(材料と方法)
(1)マウス、細胞株、抗体(Abs)、試薬
C57BL/6(H-2b)、及びBALB/c(H-2d)マウスは、CLEA Japan Inc.(Tokyo, Japan)から購入した。実験プロトコルについて、福島県立医科大学の動物実験委員会の承認を得た。C57BL/6に由来する悪性黒色腫(メラノーマ)細胞株であるB16F1は、RIKEN BRC CELL BANK(Ibaraki, Japan)から購入した。細胞の単離に用いた抗体は、特に記載のない限りBioLegend(San Diego, US)から購入した。マイクロビーズを結合した抗体及びストレプトアビジンは、Miltenyi-Biotech(Auburn, US)から購入した。組換えマウスGM-CSF、組換えマウスSCF、組換えマウスIL-4、及び組換えマウスTNFαは、R&D Systems(Minneapolis, US)から購入した。組換えヒトIL-2はShenandoah Biotech(Warwick, US)から購入した。
(2)造血幹細胞の採取及び樹状細胞の生成
樹状細胞のin vitroでの生成は、以前に報告した方法に沿って行った(Mochizuki K. et al., Blood, 2016, 23, 127(25), 3270-80)。手短には、骨髄から単離したc-kit陽性細胞を、10%FBS及び組換えマウスGM-CSF(10ng/ml)、組換えマウスSCF(10 ng/ml)、組換えマウスIL-4(2.5 ng/ml)、及び組換えマウスTNFα(4 ng/ml)を含むRPMI1640培地で培養した。培養の10日目に、樹状細胞をLPS(100 ng/ml)(SIGMA-ALDRICH)と R848(100 ng/ml)(InvivoGen)で6時間刺激した。その後、活性化樹状細胞を回収した。
BALB/cマウスの脾臓から、CD4+T細胞及び/又はCD8+T細胞を、マイクロビーズ結合抗体(MiniMACS; Miltenyi Biotech, Germany)を用いて単離した。純度は一貫して92%以上であった。単離したT細胞を、10%FBS及び組換えヒトIL-2(200U/ml)を含むRPMI1640培地を用いて96ウェルU底プレート中で、上記の通りin vitroで生成した宿主C57BL/6マウス(自家)由来の樹状細胞と共培養することによって刺激した。共培養は、5%CO2及び37℃で3日間行い、T細胞と樹状細胞の比は2:1~4:1であった。得られたT細胞を以下のin vivo注射で使用した。
C57BL/6マウス(宿主)に、0日目に悪性黒色腫細胞株B16F1を皮下注射により接種した(接種した腫瘍量は以下にそれぞれ記載する)。その後、上記共培養により調製したBALB/cマウスに由来するex-vivo共培養同種T細胞(2×106cells/mouse)を、腫瘍接種の9日目に、腫瘍内に直接注射により投与した。腫瘍及び全身の状態は、2日~3日毎に観察した。腫瘍径をノギスを用いて測定し、測定値から以下の式により腫瘍体積を求めた:腫瘍体積(mm3)=(長径×短径2)/2。腫瘍長径が18mmを超えたマウスは、全て倫理的な理由から安楽死させた。また、合併症を観察する目的にて、ex-vivo共培養同種T細胞の投与の時から、マウスの体重を2日~3日毎に測定した。
BALB/cマウス(同種)から単離したCD4+T細胞をC57BL/6マウス(自家)由来樹状細胞と共培養して刺激し、この同種CD4+T細胞を腫瘍(B16F1)が接種されたC57BL/6マウスの腫瘍内に投与した場合の、腫瘍体積、生存率、及び体重変化率を、それぞれ図1~3に示す。
(材料と方法)
実施例1に記載の方法に従い、0日目にB16F1をC57BL/6マウスに1.0×106 cells皮下接種した。実施例1に記載した通りの方法で調製したC57BL/6マウス(自家)由来樹状細胞と共培養した同種(BALB/cマウス由来)CD4+T細胞を9日目に投与した。宿主CD8+T細胞は、抗マウスCD8a抗体(腫瘍接種の8日目に500μg、10日目と12日目にそれぞれ250μgを腹腔内注射: BioXcel, New Haven,US)を用いて枯渇させた。対照にはIgG(BioXcel, New Haven, US)を腹腔内投与した。
図4に示す通り、宿主CD8+細胞を抗CD8抗体により枯渇させた場合、同種CD4+T細胞による腫瘍退縮効果は認められず、腫瘍は増大した。
(材料と方法)
C57BL/6マウスに0日目にB16F1を0.5×106cells皮下接種し、C57BL/6マウス(自家)由来樹状細胞と共培養した同種(BALB/cマウス由来)CD4+T細胞を9日目に投与した。生存したC57BL/6マウスに対し、6カ月後に2回目の腫瘍接種(B16F1を2.5×106cells皮下接種)を行った場合の腫瘍体積を測定した。過去に腫瘍接種および細胞療法を受けていないナイーブなC57BL/6マウスを対照とした。なお、同種(BALB/cマウス由来)CD4+T細胞の調製方法は実施例1に記載の方法に準じた。
図5に示す通り、C57BL/6マウス由来樹状細胞と共培養した同種CD4+T細胞を投与後、生存したマウスでは、6ヶ月後に腫瘍を再接種した場合であっても腫瘍の発生を抑制した。この結果は、腫瘍に対する同種CD4+T細胞の投与により、宿主の腫瘍特異的な免疫が誘導され、同抗腫瘍免疫が長期的な再発予防効果を有していることを示している。
(材料と方法)
実施例1に記載したのと同様の条件で、C57BL/6マウスの右側腹部及び左側腹部に同量(それぞれに1.0×106cells)のB16F1を皮下注射により接種し、その後、C57BL/6マウス由来樹状細胞と共培養した同種(BALB/cマウス由来)CD4+T細胞(2×106cells/mouse)を左側腹部の腫瘍内に注射により投与した。
腫瘍体積を図6に、生存率を図7に示す。図6(A~E:対照、F~J:投与)に示される通り、同種CD4+T細胞を投与したマウスでは、5匹中4匹のマウスにおいて投与した左側腹部だけでなく、右側腹部においても腫瘍が退縮した。また、図7に示される通り、同種CD4+T細胞を投与したマウスでは、生存率が顕著に上昇していた。これらの結果は、同種CD4+T細胞の投与が、全身的な宿主の抗腫瘍免疫を誘導し、投与部位以外の腫瘍に対しても効果を奏し得ることを示している。
(目的)
MHCクラスII分子が同一の別個体からの樹状細胞を用いた場合でも腫瘍退縮効果が認められるかどうか検証する。
129X1(H-2b)マウスは、Japan SLC,Inc.(Shizuoka, Japan)から購入した。BALB/cマウスから単離したCD4+T細胞をC57BL/6又は129X1マウス(C57BL/6マウスと同一のMHCクラスII分子を有する)由来の樹状細胞と共培養し、この同種CD4+T細胞を、腫瘍(B16F1)を接種されたC57BL/6マウスの腫瘍内に投与した場合の、腫瘍体積を測定した。その他の方法は、実施例1に記載した通りである。
図8(0日目にB16F1:1.0×106cells皮下接種)に示される通り、129X1マウス由来の樹状細胞と共培養した同種CD4+T細胞の投与は、C57BL/6マウス由来の樹状細胞と共培養した同種CD4+T細胞を投与した場合と同様に、腫瘍体積を顕著に減少させた(図8B及びC)。これに対し、CD4+T細胞の投与を行わない対照の投与は腫瘍体積を減少させなかった(図8A)。
(材料と方法)
細胞保存液としてSTEM-CELLBANKER(登録商標) DMSO Free GMP grade(Zenoaq Resource, Fukushima, Japan)を用いた。細胞源凍結においては、C57BL/6マウスの骨髄から単離したc-kit陽性細胞の段階及びBALB/cマウスから単離したCD4+T細胞の段階で、それぞれSTEM-CELLBANKER(登録商標) DMSO Free GMP grade(ゼノアックリソース)を用いて-80℃に凍結保存し、使用時に解凍した。その他の方法は実施例1に記載の通りである。
図9(0日目にB16F1:1.0×106cells皮下接種)に示される通り、細胞源(c-kit陽性細胞及び樹状細胞と共培養する前のCD4+T細胞)又は細胞製剤(樹状細胞との共培養により得られたCD4+T細胞)を凍結保存した場合であっても、同種CD4+T細胞の投与は、細胞源又は細胞製剤を凍結保存しない場合と同様に、腫瘍体積を顕著に減少させた(図9B~D)。これに対し、CD4+T細胞の投与を行わない対照の投与は腫瘍体積を減少させなかった(図9A)。
これらの結果は、細胞源又は細胞製剤を凍結保存した場合であっても、同種CD4+T細胞の腫瘍退縮効果が失われないことを示している。
(材料と方法)
BALB/cに由来する結腸がん細胞株であるColon-26は、Cell Resource Center for Biomedical Research, Institute of Development, Aging and Cancer, Tohoku University(Sendai, Japan)から入手した。
C57BL/6マウスから単離したCD4+T細胞をBALB/cマウス由来樹状細胞と共培養し、この同種CD4+T細胞を腫瘍(Colon-26)接種されたBALB/cマウスの腫瘍内に投与した場合の、腫瘍体積及び生存率を、それぞれ図10及び11に示す。
Claims (3)
- 被験体における腫瘍の治療及び/又は予防のための、同種CD4+T細胞を含む組成物であって、
前記同種CD4+T細胞が、(a)前記被験体のMHCクラスII分子と全部又は一部が異なるMHCクラスII分子を有し、かつ(b)前記被験体又は前記被験体のMHCクラスII分子と完全一致又は部分一致するMHCクラスII分子を有する個体に由来する樹状細胞とex vivoで共培養した細胞を含む、前記組成物。 - 腫瘍内投与のための、請求項1に記載の組成物。
- 同種CD4+T細胞を、前記被験体又は前記被験体のMHCクラスII分子と完全一致又は部分一致するMHCクラスII分子を有する個体に由来する樹状細胞とex vivoで共培養する工程を含む、請求項1又は2に記載の組成物の製造方法。
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Title |
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Blood, (2011), 117, [5], p.1555-1564 |
J. Chin. Med. Assoc., (2018), 81, [4], p.316-323 |
Leuk. Res., (2009), 33, [4], p.525-538 |
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