JP6067560B2 - 無血清培養及び浮遊培養に適応されたmdck細胞株及び前記細胞を使用してワクチン用ウイルスを製造する方法 - Google Patents
無血清培養及び浮遊培養に適応されたmdck細胞株及び前記細胞を使用してワクチン用ウイルスを製造する方法 Download PDFInfo
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Description
細胞培養の場合、一般的に増殖因子としてウシ胎児血清を添加する。血清の場合、プリオンやウイルスによる汚染が発生し得、製品間の品質偏差があり得る。しかも、オーストラリアやニュージーランド由来の高品質血清の場合、非常に高いことから製造コストが増加する。
本出願は、2010年9月6日出願の国際出願PCT/KR2010/006041、及び2011年8月26日出願の韓国特許出願第10‐2011‐0085902号に基づく優先権を主張し、該当出願の明細書および図面に開示された内容は、すべて本出願に援用される。
上記課題を解決するために、本発明は、ATCC CCL‐34として寄託されたMDCK(Madin Darby Canine Kidney)細胞から誘導され、細胞成長のために血清を要さず、付着のための担体なしに浮遊培養が可能な特定のMDCK細胞株を提供する。
さらに詳しくは、(a)ATCC CCL‐34として寄託されたMDCK細胞を用意するステップと、(b)前記MDCK細胞を、化学的に定義された無血清培地で生長するように適応させるステップと、(c)ステップ(b)で適応された付着性である前記MDCK細胞を、化学的に定義された無血清培地の中で担体適応ステップを経ずに浮遊培養適応を誘導することで担体なしに浮遊状態で生長するように適応させたMDCK細胞を製造する方法、及び、このような方法を通じて得られた無血清培養及び浮遊培養が可能なMDCK細胞株を提供する。
MDCK細胞株CCL‐34は、ATCCから分譲を受けた。T‐25フラスコ内の10%血清を含むEMEM培地で培養温度37℃、5% CO2の条件で培養した。前記細胞を拡張した後、前記培地に無血清培地を50%含む培地に培養し、細胞の異常可否を確認した。細胞の成長に異常がない場合、無血清培地を75%含む培地で培養し、前記方法を繰り返して100%の無血清培地に適応された細胞株を確保した。無血清培養に使われた培地は、例えばEX‐CELL MDCK(Sigma)、UltraMDCK(Lonza)、VP‐SFM(Invitrogen)などが挙げられる。
無血清培養MDCK細胞株を、以下の表1の条件の下で培養し、その増殖性を評価した。対照群としては、10%血清を含む培地で成長するMDCK細胞(ATCC CCL‐34)を使用した。
無血清培養及び浮遊培養に適応された細胞株3種に対して、スピナーフラスコで連続的に培養し、細胞増殖形態及び継代による安定性を確認した。培養開始細胞濃度は約4×105cells/mlにし、培養してから約3日ないし4日経過後の細胞濃度は約2×106cells/ml以上まで到逹した。培養条件は以下のようである。その結果を図1に示した。
培養規模:50ml スピナーフラスコ
スピナーの回転数:60rpm
培養条件:37℃、5% CO2、湿潤下
継代条件:培養してから3〜4日経過後
〈実施例4〉ウイルス増殖評価
本発明の前記MDCK細胞を用いて浮遊培養条件でウイルスを増殖させた。本実験に使用されたウイルスは2010/2011年のインフルエンザワクチン株であり、培養条件は以下のようである。
培養規模:1000ml スピナーフラスコ
スピナーの回転数:60rpm
培養条件:34℃、5% CO2、湿潤下
培養期間:3日
通常、インフルエンザウイルスを培養するとき、37℃よりは34℃でよく増殖されると知られており、これを実験を通じて確認した。また、細胞株を用いたウイルスの培養時、感染のためにトリプシンを培養培地に含ませた。インフルエンザウイルスの力価測定は、血球凝集反応アッセイ(hemagglutination assay)を施して測定した。3日間培養後、ほとんどの細胞が死滅し、培養上澄液を回収してウイルス力価を測定した。測定結果を下記表2に示した。表2に示すように、ほとんど1024以上のHA力価を示した。このようなウイルスの増殖は、発育中の鶏卵または10%血清で培養されたMDCK細胞に似たレベルであった。従って、本発明のMDCK細胞株を用いて無血清及び浮遊培養の状態でウイルスを効率的に製造できることが判明された。
本発明の前記MDCK細胞で増殖されたインフルエンザウイルスの抗体形成能を確認するために、培養液からウイルスを精製した後マウスに接種して抗体値を確認した。精製工程の流れ図を図2に示し、大枠の精製工程は以下のようである。
まず、ウイルス培養液を遠心分離して細胞残存物を除去し、0.45μmサイズのフィルターを利用して濾過した。300kDa cut‐offサイズの限外濾過フィルターを利用して濃縮した後、ホルマリンでウイルスを不活化した。その後、ウイルス培養液を、ショ糖密度勾配を利用した超遠心分離を利用してウイルスを分離し、Triton X‐100を処理してウイルスを粉碎した後、限外濾過を通じて濃縮及び洗浄剤を除去し、0.2μmサイズのフィルターで除菌及び濾過することでワクチン原液を獲得した。
本発明のMDCK Sky1023及びMDCK Sky3851細胞株に対する腫瘍形成能を評価するために、細胞株及び細胞来由物質をヌードマウスの皮下に移植した後、12週間にわたって腫瘍の形成を観察した。試験動物としては、BALB/c‐nu/nu系統のマウスを使った。接種サンプルは、細胞(細胞数101、103、105、及び107)、細胞溶解物(細胞数105及び107)、細胞DNA(細胞数105及び107)であり、各群当たり5〜10匹ずつ接種した。実験結果は、表4に示し、本発明のMDCK Sky1023及びMDCK Sky3851細胞株の場合、内部対照群である元のMDCK(ATCC)細胞株に比べて、腫瘍形成能が低いか全くないと確認された。
Claims (11)
- ATCC CCL‐34として寄託されたMDCK細胞から誘導され、細胞成長のために血清を要さず、付着のための担体なしに浮遊培養が可能なMDCK細胞株である、MDCK Sky1023(DSM ACC3112)。
- ATCC CCL−34として寄託されたMDCK細胞から誘導され、細胞成長のために血清を要さず、付着のための担体なしに浮遊培養が可能なMDCK細胞株である、MDCK Sky10234(DSM ACC3114)。
- ATCC CCL−34として寄託されたMDCK細胞から誘導され、細胞成長のために血清を要さず、付着のための担体なしに浮遊培養が可能なMDCK細胞株である、MDCK Sky3851(DSM ACC3113)。
- 請求項1から3のうち何れか1項に記載の細胞株を利用してワクチン用ウイルスを製造する方法。
- 前記ウイルスは、インフルエンザウイルス、麻疹ウイルス、日本脳炎ウイルス、耳下腺炎ウイルス、風疹ウイルス、ポリオウイルス、HSV‐1、HSV‐2、狂犬病ウイルス、RSウイルス、レオウイルス3型、黄熱ウイルス、パルボウイルス、コクサッキーウイルス、アデノウイルス1型ないし47型、ラッサウイルス、ワクシニアウイルスから構成された群から選択されることを特徴とする請求項4に記載の方法。
- 前記ウイルスは、インフルエンザウイルスであることを特徴とする請求項5に記載の方法。
- (a)請求項1から3のうち何れか1項に記載のMDCK細胞を利用して1×104個ないし1×106個cells/mlの接種濃度で無血清細胞培養培地を接種するステップと、
(b)40〜100rpmの撹拌速度、6.5〜7.5のpH、及び35〜100%の溶存酸素量(DO)からなる群から選択される1つ以上の培養条件を維持しながら前記細胞を培養するステップを含み、使い捨て生物反応器システムで前記MDCK細胞を5×106個以上cells/mlの細胞密度に増殖させるステップと、
(c)前記増殖されたMDCK細胞をインフルエンザウイルスで感染させるステップと、
(d)インフルエンザウイルスの複製を許容する条件の下で前記感染された増殖MDCK細胞を培養するステップと、
(e)細胞培養組成物からインフルエンザウイルスを分離するステップとを含むことを特徴とする細胞培養物でインフルエンザウイルスを生産する方法。 - 前記ステップ(b)では、前記細胞培養物に新鮮な培地の追加または培地を一部除去して新鮮な培地に交換する請求項7に記載の方法。
- 前記MDCK Sky1023(DSM ACC3112)は、腫瘍形成能が元のMDCK細胞株に比べて低いか全くないことを特徴とする請求項1に記載のMDCK Sky1023(DSM ACC3112)。
- 前記MDCK Sky10234(DSM ACC3114)は、腫瘍形成能が元のMDCK細胞株に比べて低いか全くないことを特徴とする請求項2に記載のMDCK Sky10234(DSM ACC3114)。
- 前記MDCK Sky3851(DSM ACC3113)は、腫瘍形成能が元のMDCK細胞株に比べて低いか全くないことを特徴とする請求項3に記載のMDCK Sky3851(DSM ACC3113)。
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PCT/KR2011/006589 WO2012033328A2 (en) | 2010-09-06 | 2011-09-06 | Mdck-derived cell lines adapted to serum-free culture and suspension culture and method for preparing vaccine virus using the cells |
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- 2011-09-06 JP JP2013527024A patent/JP6067560B2/ja active Active
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RS57656B1 (sr) | 2018-11-30 |
HUE040534T2 (hu) | 2019-03-28 |
EP2614140B8 (en) | 2018-10-17 |
LT2614140T (lt) | 2018-10-25 |
CN104862267B (zh) | 2019-07-12 |
WO2012033328A2 (en) | 2012-03-15 |
TR201815631T4 (tr) | 2018-11-21 |
WO2012033328A3 (en) | 2012-06-28 |
AU2011299761B2 (en) | 2017-01-05 |
AU2011299761A1 (en) | 2013-03-21 |
EP2614140A4 (en) | 2014-03-05 |
DK2614140T3 (en) | 2018-10-22 |
PT2614140T (pt) | 2018-11-22 |
BR112013005298A2 (pt) | 2020-01-07 |
CY1120911T1 (el) | 2019-12-11 |
CN104862267A (zh) | 2015-08-26 |
KR101577745B1 (ko) | 2015-12-16 |
US9447383B2 (en) | 2016-09-20 |
WO2012033236A1 (ko) | 2012-03-15 |
JP2013540431A (ja) | 2013-11-07 |
SI2614140T1 (sl) | 2018-11-30 |
HRP20181422T1 (hr) | 2018-10-19 |
US20150247128A1 (en) | 2015-09-03 |
PL2614140T3 (pl) | 2019-02-28 |
EP2614140B1 (en) | 2018-08-08 |
ES2695044T3 (es) | 2018-12-28 |
KR20150056519A (ko) | 2015-05-26 |
CN103154238A (zh) | 2013-06-12 |
EP2614140A2 (en) | 2013-07-17 |
KR20120024464A (ko) | 2012-03-14 |
US20130183741A1 (en) | 2013-07-18 |
SMT201800572T1 (it) | 2019-01-11 |
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