JP6796486B2 - 胚の培養方法および培地 - Google Patents
胚の培養方法および培地 Download PDFInfo
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- JP6796486B2 JP6796486B2 JP2016525468A JP2016525468A JP6796486B2 JP 6796486 B2 JP6796486 B2 JP 6796486B2 JP 2016525468 A JP2016525468 A JP 2016525468A JP 2016525468 A JP2016525468 A JP 2016525468A JP 6796486 B2 JP6796486 B2 JP 6796486B2
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Description
本願は、表題「EMBRYO CULTURE METHODS AND MEDIA」の2013年7月9日に出願した米国特許仮出願第61/844,345号から優先権を主張するものであり、この文献全体は参照により本明細書中に援用される。
本願は、全体的に胚の培養のための方法および組成物に関する。具体的に、本方法および組成物は、全体的に、胚の発達に有益であると従来では認識されていない量の乳酸塩を有する培地およびこの培地を使用する方法に関する。
不妊症は、概して、1年の避妊をしない性交などのいくらかの期間の後に妊娠することができなくなることを指す。米国の女性の約6%が不妊症を経験していると推定されている。英国では、カップルの約14%が生殖能力の問題を経験していると示唆されるとの報告がいくつかある。生殖能力の欠如は、いずれかの性、または男性および女性の両方に原因がある可能性がある。多くの要因のいずれも、不妊症の一因または不妊症の主な原因となり得る。このような要因として、DNAの損傷、遺伝的要因、いずれかのパートナーの健康もしくは他の疾患要因、毒素、免疫系の問題、ホルモンおよび他の内分泌因子、ウイルスまたは他の微生物により引き起こされる感染症などが挙げられる。
追加的な実施形態を、以下の実施例でさらに詳細に開示する。これは、特許請求の範囲を限定する意図を全く持つものではない。
0日目(受精日)に、洗浄皿および培養皿を、それぞれ対応する試験培地で調製した。この皿を、一晩5%CO2のインキュベーター内で、39℃で平衡にした。
洗浄皿:各試験培地に関する油の下100μLの洗浄アリコート
培養皿:各試験培地に関する油の下50μLの培養アリコート
ウシ胚を、1mMまたは5mMの乳酸塩を含むプロトタイプAの培地で、実施例1に記載されるように、受精させ、洗浄し、培養した。各培養培地の新鮮な液滴中で(胚を含まない各培地のそれぞれの対照液滴と共に)各時点から個々に胚を24時間培養することにより、2日目、3日目、および7日目に、胚によるグルコース消費を測定し、次いで、消費された培地および対照培地を、グルコース濃度について解析して、各時点での各培地中の胚により消費された量を決定した。結果を図2に示す。簡単に説明すると、これらのデータから、低濃度の乳酸塩培地(プロトタイプA、1mM)では、特にD2(2〜4細胞期)および第7日目(胚盤胞)の細胞期で胚によるグルコースの消費がより少ないことを証明される。
Claims (15)
- ヒト胚をインビトロで培養する方法であって、
(a)1mMの出発乳酸塩濃度及び2mM未満かつ0mMを超えるグルコース濃度を含み、血清を含まない培地であって、連続型培地であるか前記胚の培養の最中に少なくとも一度補充される培地である、培地を提供することと、
(b)前記培地でヒト胚を培養することと、
を含む、方法。 - インキュベーターで前記胚を培養することをさらに含む、請求項1に記載の方法。
- 前記インキュベーターが、培養の最中に前記胚の1つまたは複数の画像を撮影するための撮像システムを備える、請求項2に記載の方法。
- 前記1つまたは複数の画像を、前記胚を移動させることなく撮影できる、請求項3に記載の方法。
- 前記培地が、グルコースもしくはリン酸塩を含むかもしくは含まないHTF(ヒト卵管液培地)、HTF改変培地、Whitten’s培地、Ham’s F−10培地、またはKSOM培地のいずれかの改変版であり、タンパク質の補充が行われても、または行われなくてもよい、請求項1〜4のいずれか1項に記載の方法。
- 前記胚が、不妊症に罹患しているかまたは不妊治療を受けている患者由来である、請求項1〜5のいずれか1項に記載の方法。
- 前記胚を、1日〜7日間培養する、請求項1〜6のいずれか1項に記載の方法。
- 前記胚を、3日間〜6日間培養する、請求項7に記載の方法。
- 前記胚を、8細胞期または胚盤胞期に達するまで培養する、請求項8に記載の方法。
- 前記胚が女性の患者に移植するためのものである、請求項1〜9のいずれか1項に記載の方法。
- ヒト胚を培養するための組成物であって、1mMの乳酸塩濃度、2mM未満かつ0mMを超えるグルコース濃度を有するよう改変した胚培養培地を含み、前記胚培養培地が血清を含まず、前記胚培養培地が、連続型培地であるか前記胚の培養の最中に少なくとも一度補充される培地である、組成物。
- 前記培地がヒト血清アルブミンをさらに含む、請求項1に記載の方法。
- 少なくとも1つの追加的なエネルギー基質をさらに含む、請求項11に記載の組成物。
- 前記エネルギー基質がピルビン酸塩である、請求項13に記載の組成物。
- 前記ピルビン酸塩が約1.0mM〜約3mMの濃度で組成物中に存在する、請求項14に記載の組成物。
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