いや、今送ってきたよ。
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[培地の違い1]
>>学さん
前回の続きです、まず以下はレター論文の最後の二つの文章です。
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As for STAP-cell-derived Fgf4-induced stem cells, which can also contribute to both embryonic and placental tissues, our in vitro conversion study combined with inhibitor treatments clearly indicate that the bidirectional potential of Fgf4-induced stem cells is unlikely to reflect the co-presence of separate subpopulations of ES-like and trophoblast-stem-like cells in the culture.
[培地の違い2]
(続き)
Collectively, our study indicates that STAP-based conversion can reprogram somatic cells to acquire not only pluripotency but also the ability of trophoblast differentiation.
[培地の違い4]
それに対して、Extended Data Figure 5-c,dの培地は何なのか。リジェンドには以下のようにある。
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a–f, JAK inhibitor treatment assay for Fgf4-induced stem cells. Fgf4-induced stem cells were cultured under feeder-free conditions and treated with 0.6 μM JAK inhibitor for 48 h. JAK inhibitor treatment assay eliminated ES cells (Oct4-GFP+) from the culture (a, b).
[培地の違い5]
(続き)
The level of Oct4-GFP expression in Fgf4-induced stem cells, which was moderate, was maintained even after JAK inhibitor treatment (c, d; three independent experiments). Scale bar, 100 μm.
[培地の違い7]
ではe,fの培地は何なんでしょうかね。リジェンドは以下です。
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e, f, For an additional control, Fgf4-induced stem cells were plated in trophoblast stem-cell medium containing Fgf4 together with Oct4-GFP ES cells that constitutively expressed BFP (the number of plated cells was one-tenth of that of plated Fgf4-induced stem cells).
[培地の違い8]
（続き)
Whereas BFP-expressing colonies (ES-cell-derived) still expressed Oct4-GFP in trophoblast stem-cell culture medium after 2 days (e), no Oct4-GFP+ colonies from BFP-expressing ES cells were observed in the JAK-inhibitor-treated culture (f).
[培地の違い11]
Extended Data Figure 5-cのFI-SCのOct4-GFPが蛍光しているのに、5-eのOct4-GFPが蛍光していないのは、前者の培地がES培地であり、後者の培地がTS培地だからだということです。前者は査読者の求めに応じて、まずES-like転換後のFI-SCにJAKiを添加してES細胞でないことを示したもの。後者は、TS培地の中でTS-like転換されているFI-SCのOct4-GFP蛍光がなく、混ぜているES細胞ではOct4-GFP蛍光があり、JAKi添加後では消えるという違いを示しているものです。
[培地の違い12]
論文のリジェンドの説明では培地の違いが分かりにくいですね。ど素人には理解しにくい。でも、本文の説明をよく読めば、 <our in vitro conversion study combined with inhibitor treatments clearly indicate that the bidirectional potential of Fgf4-induced stem cells is unlikely to reflect the co-presence of separate subpopulations of ES-like and trophoblast-stem-like cells in the culture. >の実験ってExtended Data Figure 5-e,fの実験では無いかと気づけますね。
デイナの記事はそこに繋がっているのね。
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“The bar to say you’ve demonstrated your hypothesis is correct is very high for those journals,” Vacanti says. “It’s a lower bar for other journals. Do you decide to try to jump over a lower bar or do you jump higher?”
