WO2013103053A1 - 体内時計を指標にした低品質ES細胞およびiPS細胞の簡易判別法の開発、体内時計を指標にした細胞評価法の開発 - Google Patents
体内時計を指標にした低品質ES細胞およびiPS細胞の簡易判別法の開発、体内時計を指標にした細胞評価法の開発 Download PDFInfo
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- G01N33/5044—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells for testing or evaluating the effect of chemical or biological compounds, e.g. drugs, cosmetics involving specific cell types
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- C12N5/06—Animal cells or tissues; Human cells or tissues
- C12N5/0602—Vertebrate cells
- C12N5/0603—Embryonic cells ; Embryoid bodies
- C12N5/0606—Pluripotent embryonic cells, e.g. embryonic stem cells [ES]
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- the present invention relates to a method and kit for evaluating pluripotent stem cells using a biological clock as an index.
- Non-Patent Document 1 discloses that ES cells and iPS cells do not have a biological clock, and a biological clock is formed by inducing differentiation in a test tube. However, there is no data on quality evaluation of ES cells and iPS cells. .
- An object of the present invention is to provide a method and kit for evaluating pluripotent stem cells.
- pluripotent stem cells eg, ES cells
- oncogenes e.g, oncogenes
- the body clock was not formed.
- pluripotent stem cells such as iPS cells and ES cells used in regenerative medicine
- at least cells that do not have the body clock included in the somatic cells are formed. I thought it could be excluded, and worked to establish that method.
- the present inventor has developed a method for simply and quantitatively evaluating the quality of pluripotent stem cells including iPS cells and ES cells, using the internal clock that somatic cells have as an index. .
- the present invention provides the following evaluation methods and kits.
- Item 1. A method for evaluating pluripotent stem cells, comprising analyzing the expression of clock genes in cells differentiated from pluripotent stem cells and evaluating the pluripotent stem cells based on the degree of expression.
- Item 2. Item 2. The method according to Item 1, wherein the clock gene is Per2 and / or Bmal1 and / or Dbp.
- Item 3. Item 2. The method according to Item 1, wherein the pluripotent stem cell is an ES cell or an iPS cell.
- Item 4. Item 2.
- a gene construct comprising a reporter gene linked to a clock gene promoter is introduced into the pluripotent stem cell to be evaluated, and the expression pattern of the clock gene is analyzed based on the expression of the reporter gene.
- Item 5. The method according to Item 4, wherein the reporter gene is a fluorescent protein gene, a luciferase gene, a ⁇ -galactosidase gene, or a chloramphenicol acetyltransferase gene.
- Item 6. A kit for evaluating pluripotent stem cells, comprising a gene construct comprising a reporter gene linked to a promoter of a clock gene.
- Item 7. The kit according to Item 6, wherein the clock gene is Per2 and / or Bmal1 and / or Dbp.
- Item 8. Item 7. The kit according to Item 6, wherein the pluripotent stem cell is an ES cell or iPS cell.
- pluripotent stem cells having an abnormal expression such as an oncogene can be excluded from normal pluripotent stem cells because they do not normally form a circadian clock when differentiated. It is now possible to select and use pluripotent stem cells without worry. Various studies have been conducted using pluripotent stem cells, and it is expected that more appropriate studies will be conducted by selecting pluripotent stem cells that are not likely to become cancerous according to the present invention.
- pluripotent stem cells such as iPS cells and ES cells used in regenerative medicine
- at least cells that do not have a biological clock provided by somatic cells are formed.
- a method for easily and quantitatively evaluating the quality of pluripotent stem cells including iPS cells and ES cells has been established.
- FIG. 1 shows the oscillation of the circadian clock that appears when normal mouse ES cells (model of high-quality iPS cells) are induced to differentiate by the method of the present invention.
- FIG. 2 shows the oscillation of the biological clock and the fast Fourier that appear when differentiation of ES cells (model of low quality ES cells / iPS cells) ⁇ ⁇ ⁇ with very weak expression characteristics of the oncogene c-Myc is induced by the method of the present invention. The frequency analysis by development is shown.
- FIG. 3 shows quantitative evaluation of the ability to form a biological clock by differentiation induction culture of normal ES cells.
- FIG. 4 shows the bioluminescence intensity before differentiation of human iPS cells (hiPS) and 4 weeks after induction of in vitro differentiation. The formation of circadian clock is reproduced by differentiation induction.
- clock genes include Clock, Bmal1, Period (Per1, Per2, Per3), Cryptochrome (Cry1, Cry2), and Albamin D-boxbinding protein (Dbp).
- Preferred clock genes are Bmal1, Per2, and Dbp.
- the expression of at least one clock gene can be analyzed.
- “analyzing expression” includes measuring the expression level of a clock gene. Measurement of the expression level of the clock gene can be carried out, for example, by measuring the expression level of a reporter gene operably linked to the promoter of the clock gene.
- a pluripotent stem cell refers to a cell that can be differentiated into at least two types of cells, and the clock gene is stopped or almost stopped.
- Preferred pluripotent stem cells are ES cells and iPS cells. However, any cell that can differentiate into at least two types of cells and whose clock gene is stopped or almost stopped is used in the present invention. Included in pluripotent stem cells to be evaluated. So-called adult stem cells are not included in the pluripotent stem cells of the present invention because the clock gene functions. Cells that are undergoing direct reprogramming may have their clock genes stopped or almost stopped, such as when the developmental lineage (endoderm, mesoderm, ectoderm) changes to a cell with significantly different properties. For example, it can be included in the pluripotent stem cells to be evaluated of the present invention.
- pluripotent stem cells includes mammals, such as humans, monkeys, chimpanzees, mice, rats, rabbits, goats, dogs, cats, cows, horses, and pigs.
- Pluripotent stem cells such as ES cells and iPS cells used in the present invention exist as a cell population. Since such a cell population has a homogeneous property (quality), the whole pluripotent stem cell can be evaluated by evaluating a part of the cell population by the method of the present invention.
- the expression of the clock gene may be measured by Northern blotting for mRNA expression, or may be measured by a method using an antibody such as Western blotting or ELISA, but preferably any one of the clock genes. It is preferable to evaluate the expression of the clock gene by linking a reporter gene downstream of the promoter and measuring the expression level of the reporter gene.
- the reporter gene include genes such as fluorescent proteins (for example, GFP, CFP, BFP, YFP, DsRED, etc.), luciferase (fireflies, sea urchins, Renilla, etc.), ⁇ -galactosidase, chloramphenicol acetyltransferase, and the like.
- luciferase is preferable.
- the present invention introduces a gene construct in which a reporter gene is linked to a clock gene promoter into a pluripotent stem cell to be evaluated or a differentiated cell thereof, and the expression level of the reporter gene in the differentiated pluripotent stem cell It is possible to evaluate pluripotent stem cells.
- the kit of the present invention contains this gene construct.
- the kit may further contain at least one of pluripotent stem cells such as ES cells and iPS cells, a differentiation induction medium, a culture medium for pluripotent stem cells, and a culture container such as a petri dish.
- ⁇ evaluating '' a pluripotent stem cell means evaluating the ability (potential) of a pluripotent stem cell to differentiate into a target cell without differentiating into a non-target cell such as a cancer cell. means.
- pluripotent stem cells When 12% of pluripotent stem cells express a clock gene after about 4 weeks of differentiation, pluripotent stem cells are unlikely to become functional cells after differentiation induction (low evaluation) ). The higher the ratio of the expression of the clock gene in the cells differentiated from the pluripotent stem cells, the higher the evaluation of the original pluripotent stem cells.
- iPS cells in which the circadian clock is impaired after differentiation, may cause various disorders including canceration when differentiated and transplanted into mammals including humans.
- pluripotent stem cells are cultured in a suitable medium in a petri dish or the like and then cultured in a differentiation induction medium for several weeks. Cultivation is preferably carried out for 3 weeks or more, preferably about 3 to 5 weeks, particularly about 4 weeks, and the expression of the clock gene is evaluated. If the culture period after differentiation induction is 5-6 weeks or longer, the cells gradually weaken and the expression of clock genes decreases, so it is not preferable that the culture period after differentiation induction is too long.
- the culture period is preferably less than 5 weeks.
- the cells become confluent when the culture period after differentiation induction is about 3 to 4 weeks. Culture after differentiation induction can be performed while exchanging the medium.
- the frequency of medium replacement is, for example, about once every two days, but is not limited thereto, and medium replacement can be performed once a day or in other periods.
- a fluorescent protein such as GFP
- light may be detected by irradiating light to cells differentiated from pluripotent stem cells.
- luciferase When luciferase is used, luciferin is used. The amount of luminescence may be measured with luciferase. Even when other reporter genes are used, the expression of the clock gene can be evaluated by an appropriate method for evaluating the reporter gene product in accordance with the reporter gene.
- the reproducibility of the circadian clock formation experiment in the differentiation-inducing culture protocol according to the present invention is 85% or more, 90% or more, 95% or more, 98% or more, 99% or more, or 100%.
- Sexual stem cells can be evaluated with good reproducibility.
- ES cells incorporating a reporter gene (luciferase gene) for monitoring the expression of clock genes (Per2, Bmal1) are used as high-quality pluripotent stem cells, and clock genes (Per2, Bmal1)
- clock genes Per2, Bmal1
- c-Myc gene-introduced ES cells that show about 1.3 to 4 times the expression level of endogenous c-Myc gene in wild-type ES cells are used. It was. Of these, low-quality ES cells, whose c-Myc expression level is approximately 1.3 times that of wild-type ES cells, are measured by c-Myc gene expression levels by quantitative PCR, which is commonly used for cell quality evaluation.
- the present invention is characterized in that quality evaluation of pluripotent stem cells that cannot be discriminated by the conventional method can be realized.
- Example 1 Embryoid Body Formation Mouse ES cells from which feeder cells have been removed are diluted to 2 ⁇ 10 4 cells / mL in a fibroblast medium, and seeded at 100 ⁇ L each in a low adhesion round bottom 96-well plate. Incubate for 48 hours at 37 ° C., 5% CO 2 .
- (2) differentiation culture of Embryoid Body Embryoid bodies prepared by hanging drop culture are transferred to a 24-well plate and cultured in fibroblast medium for 25 days at 37 ° C. and 5% CO 2 . There will be no passage during this time.
- medium exchange is performed once every two days, while changing the intervals appropriately so as not to be at regular intervals.
- the circadian clock is measured 25 days after the differentiation induction medium.
- the composition of the fibroblast medium is shown below.
- DMEM Nakarai Tesque
- FBS 1 mM sodium pyruvate
- GabcoBRL 1 mM sodium pyruvate
- Gabco BRL 0.1 mM MEM non-essential amino acid
- 2-mercaptoethanol Sigma
- 50 units / mL penicillin-streptomycin 50 units / mL penicillin-streptomycin (Nakarai Tesque )
- the low-quality mouse ES cells and high-quality mouse ES cells used were each introduced with a gene construct (reporter vector) in which a firefly luciferase gene was linked after the promoter of the clock gene (Per2, Bmal1) into the mouse ES cells.
- the reporter vector used was one produced by the present inventors according to a conventional method, and the luciferase gene used was a gene excised from a vector sold by Clontech (Clontech).
- ES cells wild-type high-quality mouse ES cells and low-quality mouse ES cells were used, respectively.
- high-quality ES cells and low-quality ES cells those described above were used.
- FIG. 1 shows raw data (for 20 times) of an experiment in which measurement was actually performed.
- FIG. 2 shows an ES cell in which the oncogene c-Myc used for iPS cell production, known as Yamanaka 4 factor, is weakly and continuously expressed as a model of low-quality iPS cells.
- Fig. 6 shows data showing the formation of a circadian clock when differentiation-induced culture is performed by this method. Unlike the case of wild-type ES cells, which was a model of high-quality iPS cells, the formation of a circadian clock was observed only in about 12% (shown in red tone in FIG. 2).
- a fast Fourier expansion (FFT) analysis method is used to evaluate the strength of vibration at a frequency of about 24 hours.
- FFT fast Fourier expansion
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Abstract
Description
項1. 多能性幹細胞を評価する方法であって、多能性幹細胞から分化した細胞の時計遺伝子の発現を解析し、その発現の程度により多能性幹細胞を評価する方法。
項2. 時計遺伝子がPer2及び/又はBmal1及び/又はDbpである、項1に記載の方法。
項3. 多能性幹細胞がES細胞又はiPS細胞である、項1に記載の方法。
項4. 評価対象の多能性幹細胞に時計遺伝子のプロモータと連結したレポーター遺伝子を含む遺伝子構築物を導入し、レポーター遺伝子の発現に基づき時計遺伝子の発現パターンを解析することを特徴とする、項1に記載の方法。
項5. レポーター遺伝子が蛍光蛋白質遺伝子、ルシフェラーゼ遺伝子、β-ガラクトシダーゼ遺伝子またはクロラムフェニコールアセチルトランスフェラーゼ遺伝子である、項4に記載の方法。
項6. 時計遺伝子のプロモータと連結したレポーター遺伝子を含む遺伝子構築物を備えた、多能性幹細胞を評価するためのキット。
項7. 時計遺伝子がPer2及び/又はBmal1及び/又はDbpである、項6に記載のキット。
項8. 多能性幹細胞がES細胞又はiPS細胞である、項6に記載のキット。
項9. レポーター遺伝子が蛍光蛋白質遺伝子、ルシフェラーゼ遺伝子、β-ガラクトシダーゼ遺伝子またはクロラムフェニコールアセチルトランスフェラーゼ遺伝子である、項6に記載のキット。
実施例1
(1) Embryoid Body Formation
フィーダー細胞を除去したマウスES細胞を線維芽細胞用培地にて2×104細胞/mLに希釈し、低接着性の丸底96ウェルプレートに100μLずつ播種する。48時間、37℃、5%CO2条件で培養する。
(2) differentiation culture of Embryoid Body
hanging drop cultureで作製した胚様体(Embryoid Body)を24ウェルプレートに移して、線維芽細胞用培地にて、25日間、37℃、5%CO2条件で培養する。この間、継代はしない。また、培地交換は、1日から2日に1回ずつ、一定の間隔にならないように適度に間隔を変えながら行う。分化誘導培地25日後に体内時計を測定する。
[DMEM (Nakarai Tesque) / 10% FBS, 1 mM ピルビン酸ナトリウム(GibcoBRL), 0.1 mM MEM 非必須アミノ酸(Gibco BRL), 0.1 mM2-メルカプトエタノール(Sigma), 50 units/mL ペニシリン-ストレプトマイシン(Nakarai Tesque)]
なお、使用した低品質マウスES細胞及び高品質マウスES細胞は、いずれも時計遺伝子(Per2、Bmal1)のプロモータの後ろにホタルルシフェラーゼ遺伝子を連結した遺伝子構築物(レポーターベクター)をマウスES細胞に導入したものである。レポーターベクターは、本発明者が常法に従い製造したものを用い、ルシフェラーゼ遺伝子はClontech(クロンテック社)で販売しているベクターから切り出した遺伝子を使用した。
図1は、実際に測定を行った実験の生データ(20回分)を示したものである。
実施例2:
ヒトiPS細胞の品質評価に向け、本発明者らの開発した「体内時計を指標としたin vitro細胞評価法」が実際にヒトiPS細胞でも応用できることを示すための実験を行った。京都大学iPS細胞研究所で樹立されたヒトiPS細胞を、本方法で分化誘導培養した結果、分化誘導4週間後に体内時計が正常に形成された(図4)。この結果から、本方法がヒトiPS細胞の品質評価法としても利用可能であることが強く示唆された。
Claims (9)
- 多能性幹細胞を評価する方法であって、多能性幹細胞から分化した細胞の時計遺伝子の発現を解析し、その発現の程度により多能性幹細胞を評価する方法。
- 時計遺伝子がPer2及び/又はBmal1及び/又はDbpである、請求項1に記載の方法。
- 多能性幹細胞がES細胞又はiPS細胞である、請求項1に記載の方法。
- 評価対象の多能性幹細胞に時計遺伝子のプロモータと連結したレポーター遺伝子を含む遺伝子構築物を導入し、レポーター遺伝子の発現に基づき時計遺伝子の発現パターンを解析することを特徴とする、請求項1に記載の方法。
- レポーター遺伝子が蛍光蛋白質遺伝子、ルシフェラーゼ遺伝子、β-ガラクトシダーゼ遺伝子またはクロラムフェニコールアセチルトランスフェラーゼ遺伝子である、請求項4に記載の方法。
- 時計遺伝子のプロモータと連結したレポーター遺伝子を含む遺伝子構築物を備えた、多能性幹細胞を評価するためのキット。
- 時計遺伝子がPer2及び/又はBmal1及び/又はDbpである、請求項6に記載のキット。
- 多能性幹細胞がES細胞又はiPS細胞である、請求項6に記載のキット。
- レポーター遺伝子が蛍光蛋白質遺伝子、ルシフェラーゼ遺伝子、β-ガラクトシダーゼ遺伝子またはクロラムフェニコールアセチルトランスフェラーゼ遺伝子である、請求項6に記載のキット。
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US14/364,600 US20150292040A1 (en) | 2012-01-06 | 2012-11-14 | DEVELOPMENT OF SIMPLE DISCRIMINATION METHOD FOR LOW-QUALITY ES CELLS AND iPS CELLS AS INDICATOR OF BIOLOGICAL CLOCK, AND DEVELOPMENT OF CELL EVALUATION METHOD AS INDICATOR OF BIOLOGICAL CLOCK |
EP12864065.3A EP2801620A4 (en) | 2012-01-06 | 2012-11-14 | DEVELOPMENT OF SINGLE DISCRIMINATION METHOD OF EMBRYONIC STEM CELLS AND INDUCED LOW QUALITY INDUCED PLURIPOTENT STEM CELLS PROVIDING INDICATIONS ON BIOLOGICAL CLOCK AND DEVELOPMENT OF CELL EVALUATION METHOD PROVIDING INDICATIONS ON BIOLOGICAL CLOCK |
CN201280064472.2A CN104024424A (zh) | 2012-01-06 | 2012-11-14 | 以生物钟为指标的低品质ES细胞和iPS细胞简单判别方法的开发,和以生物钟为指标的细胞评价方法的开发 |
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- 2012-11-14 WO PCT/JP2012/079552 patent/WO2013103053A1/ja active Application Filing
- 2012-11-14 EP EP12864065.3A patent/EP2801620A4/en not_active Withdrawn
- 2012-11-14 US US14/364,600 patent/US20150292040A1/en not_active Abandoned
Patent Citations (2)
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WO2010134388A1 (ja) * | 2009-05-20 | 2010-11-25 | Mihara Makoto | 生体情報モニタリングシステム |
WO2011087154A1 (en) * | 2010-01-15 | 2011-07-21 | Kyoto University | Method for screening induced pluripotent stem cells |
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K. YAGITA ET AL., PROC. NATL. ACADSCI. USA, vol. 107, no. 8, 23 February 2010 (2010-02-23), pages 3846 - 3851 |
KAZUHIRO YAGITA: "Circadian clock and stem cell biology", JOURNAL OF CLINICAL AND EXPERIMENTAL MEDICINE, vol. 239, no. 9, 2011, pages 904 - 6, XP008174171 * |
KUO, S.J. ET AL.: "Disturbance of circadian gene expression in breast cancer", VIRCHOWS ARCH., vol. 454, no. 4, 2009, pages 467 - 74, XP019715716 * |
PICK, M. ET AL.: "Clone- and gene-specific aberrations of parental imprinting in human induced pluripotent stem cells", STEM CELLS, vol. 27, no. 11, 2009, pages 2686 - 90, XP055062998 * |
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SHOU-JEN KUO ET AL., VIRCHOWS ARCH, vol. 454, 2009, pages 467 - 474 |
YAGITA, K. ET AL.: "Development of the circadian oscillator during differentiation of mouse embryonic stem cells in vitro", PROC.NATL.ACAD. SCI.USA, vol. 107, no. 8, 2010, pages 3846 - 51, XP055080702 * |
YOU, S. ET AL.: "Daily coordination of cancer growth and circadian clock gene expression", BREAST CANCER RES.TREAT., vol. 91, no. 1, 2005, pages 47 - 60, XP019274797 * |
Also Published As
Publication number | Publication date |
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US20150292040A1 (en) | 2015-10-15 |
CN104024424A (zh) | 2014-09-03 |
EP2801620A1 (en) | 2014-11-12 |
EP2801620A4 (en) | 2015-05-27 |
JPWO2013103053A1 (ja) | 2015-05-11 |
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