JP6886667B2 - Cancer cell capture method - Google Patents

Cancer cell capture method Download PDF

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JP6886667B2
JP6886667B2 JP2019060211A JP2019060211A JP6886667B2 JP 6886667 B2 JP6886667 B2 JP 6886667B2 JP 2019060211 A JP2019060211 A JP 2019060211A JP 2019060211 A JP2019060211 A JP 2019060211A JP 6886667 B2 JP6886667 B2 JP 6886667B2
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hydrophilic polymer
blood
cancer cells
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皆川 康久
康久 皆川
賢 田中
賢 田中
隆志 干場
隆志 干場
智和 渋谷
智和 渋谷
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Sumitomo Rubber Industries Ltd
Yamagata University NUC
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Description

本発明は、体液(血液等)中のがん細胞を捕捉するがん細胞捕捉方法に関する。 The present invention relates to a method for capturing cancer cells in body fluid (blood, etc.).

がん細胞が発生するとやがて、血液・体液中に出て来ることが知られており、血液中に出て来たがん細胞は、血中循環腫瘍細胞(CTC)と呼ばれている。そして、この血中循環腫瘍細胞を調べることによるがんの治療効果の確認、予後寿命、投与前の抗がん剤の効果予測、がん細胞の遺伝子解析を用いた治療方法の検討、等が期待されている。 It is known that when cancer cells develop, they eventually appear in blood and body fluids, and the cancer cells that appear in the blood are called blood circulating tumor cells (CTCs). Then, confirmation of the therapeutic effect of cancer by examining these circulating tumor cells in the blood, prognosis lifespan, prediction of the effect of anticancer drugs before administration, examination of therapeutic methods using gene analysis of cancer cells, etc. Expected.

しかしながら、血中循環腫瘍細胞は非常に数が少なく(数個〜数百個/血液1mL)、がん細胞を捕捉することが難しいという問題がある。 However, the number of circulating tumor cells in the blood is very small (several to several hundreds / 1 mL of blood), and there is a problem that it is difficult to capture cancer cells.

例えば、血中循環腫瘍細胞の捕捉技術として、Cell Searchシステムと呼ばれるものが知られているが、これは、抗原抗体反応(EpCAM抗体で捕捉)を用いる技術であるため、EpCAMを発現しているがん細胞しか捕捉できず、補足可能ながん細胞の種類に制限がある。 For example, as a technique for capturing blood-circulating tumor cells, a technique called the Cell Search system is known, which expresses EpCAM because it is a technique that uses an antigen-antibody reaction (captured by EpCAM antibody). Only cancer cells can be captured, and there are restrictions on the types of cancer cells that can be captured.

特表2005−523981号公報Japanese Patent Application Laid-Open No. 2005-523981

本発明は、前記課題を解決し、EpCAMを発現していないがん細胞も含め、多くのがん細胞を捕捉できるがん細胞捕捉方法を提供することを目的とする。 An object of the present invention is to solve the above-mentioned problems and to provide a cancer cell capture method capable of capturing a large number of cancer cells including cancer cells that do not express EpCAM.

本発明は、体液中に含まれるがん細胞捕捉方法であって、採取した体液のたんぱく質濃度を減少させた後、親水性ポリマー層にがん細胞を捕捉させるがん細胞捕捉方法に関する。 The present invention relates to a method for capturing cancer cells contained in body fluid, which is a method for capturing cancer cells in a hydrophilic polymer layer after reducing the protein concentration of the collected body fluid.

前記親水性ポリマー層は、下記式(I)で表されるポリマー及びポリ(メタ)アクリロイルモルホリンからなる群より選択される少なくとも1種の親水性ポリマーで形成されていることが好ましい。

Figure 0006886667
(式中、Rは水素原子又はメチル基、Rはアルキル基を表す。mは1〜5、nは繰り返し数を表す。) The hydrophilic polymer layer is preferably formed of at least one hydrophilic polymer selected from the group consisting of the polymer represented by the following formula (I) and poly (meth) acryloyl morpholine.
Figure 0006886667
(In the formula, R 1 represents a hydrogen atom or a methyl group, R 2 represents an alkyl group. M represents 1 to 5, and n represents the number of repetitions.)

前記親水性ポリマー層は、下記式(I−1)で表される化合物及び(メタ)アクリロイルモルホリンからなる群より選択される少なくとも1種の親水性モノマーと、他のモノマーとの共重合体で形成されていることが好ましい。

Figure 0006886667
(式中、R、R、mは前記と同様。) The hydrophilic polymer layer is a copolymer of at least one hydrophilic monomer selected from the group consisting of a compound represented by the following formula (I-1) and (meth) acryloyl morpholine and another monomer. It is preferably formed.
Figure 0006886667
(In the formula, R 1 , R 2 , and m are the same as above.)

前記たんぱく質濃度を減少させる方法は、採取した体液を希釈するものであることが好ましい。ここで、前記希釈は、緩衝溶液又は液体培地を用いて行われることが好ましい。
前記たんぱく質濃度を減少させる方法は、採取した体液に遠心分離を施して上澄みを除去するものであることが好ましい。
The method for reducing the protein concentration is preferably to dilute the collected body fluid. Here, the dilution is preferably carried out using a buffer solution or a liquid medium.
The method for reducing the protein concentration is preferably a method of centrifuging the collected body fluid to remove the supernatant.

前記体液は、血液であることが好ましい。
前記親水性ポリマー層の厚みは、2〜200nmであることが好ましい。
The body fluid is preferably blood.
The thickness of the hydrophilic polymer layer is preferably 2 to 200 nm.

本発明によれば、体液中に含まれるがん細胞捕捉方法であって、採取した体液のたんぱく質濃度を減少させた後、親水性ポリマー層にがん細胞を捕捉させるがん細胞捕捉方法であるため、EpCAMを発現していないがん細胞も含め、多くのがん細胞を捕捉できる。そのため、例えば、体液中からがん細胞を充分に捕捉でき、また、同時に他のタンパク質や細胞の粘着・接着も抑制できる。従って、がん細胞等を選択的に捕捉することが可能となる。 According to the present invention, it is a method for capturing cancer cells contained in body fluid, which is a method for capturing cancer cells in a hydrophilic polymer layer after reducing the protein concentration of the collected body fluid. Therefore, many cancer cells can be captured, including cancer cells that do not express EpCAM. Therefore, for example, cancer cells can be sufficiently captured from body fluids, and at the same time, adhesion / adhesion of other proteins and cells can be suppressed. Therefore, it becomes possible to selectively capture cancer cells and the like.

親水性ポリマー層が形成されたウェルを有するマルチウェルプレート(医療用検査装置)の模式図の一例である。It is an example of a schematic diagram of a multi-well plate (medical inspection device) having a well on which a hydrophilic polymer layer is formed.

本発明は、体液中に含まれるがん細胞捕捉方法であって、採取した体液のたんぱく質濃度を減少させた後、親水性ポリマー層にがん細胞を捕捉させるがん細胞捕捉方法である。 The present invention is a method for capturing cancer cells contained in body fluid, which is a method for capturing cancer cells in a hydrophilic polymer layer after reducing the protein concentration of the collected body fluid.

先ず、採取した体液に、希釈、遠心分離等の処理を施すことで、採取した体液に比べ、たんぱく質濃度が減少した試料を作製した後、作製された試料を親水性ポリマー層に接触させ、試料中のがん細胞を捕捉する方法である。よって、アルブミン等のたんぱく質による細胞接着抑止効果が減じ、親水性ポリマーに対するがん細胞の本来の接着能力が発揮されるので、がん細胞の捕捉性が大きく向上すると共に、血小板等の捕捉性が低下し、たんぱく質が多い状態では到底発揮し得ないがん細胞の選択的な捕捉効果を奏する。 First, the collected body fluid is subjected to treatments such as dilution and centrifugation to prepare a sample having a reduced protein concentration as compared with the collected body fluid, and then the prepared sample is brought into contact with the hydrophilic polymer layer to prepare a sample. It is a method of capturing cancer cells inside. Therefore, the effect of suppressing cell adhesion by proteins such as albumin is reduced, and the original ability of cancer cells to adhere to hydrophilic polymers is exhibited, so that the ability to capture cancer cells is greatly improved and the ability to capture platelets and the like is improved. It has a selective effect of capturing cancer cells, which cannot be exerted when it is low and high in protein.

具体的に説明すると、血中循環腫瘍細胞(数個〜数百個/血液1mL)等の体液中にでてきた腫瘍細胞(がん細胞等)は、非常に数が少なく、検査に供するには、採取した体液中に存在する腫瘍細胞をできる限り多く捕捉することが重要であり、腫瘍細胞の接着を抑制するたんぱく質の数を減じることが必要と考えられる。本発明は、予め、採取した体液に比べ、たんぱく質濃度が減少した試料を作製した後、該試料を親水性ポリマー層に接触させる方法であるので、体液中の腫瘍細胞が親水性ポリマー層に、より多く吸着・接着される。そして、吸着された腫瘍細胞の数を測定することで、体液中の腫瘍細胞数が判り、がん治療効果の確認等を期待できる。また、捕捉した腫瘍細胞を培養し、その培養した細胞で抗がん剤等の効き目を確認することで、抗がん剤等の投与前に、体の外で、抗がん剤等の効き目を確認できると同時に、抗がん剤等の選定にも役立つ。 Specifically, the number of tumor cells (cancer cells, etc.) that have appeared in body fluids such as circulating tumor cells in the blood (several to several hundreds / 1 mL of blood) is extremely small and can be used for examination. It is important to capture as many tumor cells as possible in the collected body fluid, and it is necessary to reduce the number of proteins that suppress the adhesion of tumor cells. The present invention is a method in which a sample having a reduced protein concentration as compared with the collected body fluid is prepared in advance, and then the sample is brought into contact with the hydrophilic polymer layer. Therefore, tumor cells in the body fluid are formed on the hydrophilic polymer layer. More is adsorbed and adhered. Then, by measuring the number of adsorbed tumor cells, the number of tumor cells in the body fluid can be known, and confirmation of the cancer therapeutic effect can be expected. In addition, by culturing the captured tumor cells and confirming the efficacy of the anti-cancer drug, etc. in the cultured cells, the efficacy of the anti-cancer drug, etc. outside the body before administration of the anti-cancer drug, etc. At the same time, it is useful for selecting anticancer drugs.

以下、本発明の好ましい実施形態の一例を、図を用いて説明する。
本発明のがん細胞捕捉方法は、例えば、図1の医療用検査装置1(マルチウェルプレート1)を用いて実施できる。
Hereinafter, an example of a preferred embodiment of the present invention will be described with reference to the drawings.
The cancer cell capture method of the present invention can be carried out using, for example, the medical examination device 1 (multi-well plate 1) of FIG.

図1の医療用検査装置1(マルチウェルプレート1)は、がん細胞を捕捉する目的で使用される装置で、いわゆるマトリクス状にウェル11が配置されたマルチウェルプレート1である。マルチウェルプレート1は、円形に開口された複数のウェル11を有している。ウェル11は、血液等の体液中のたんぱく質濃度を減少させた試料を注入する凹部であり、注入した試料を検査に供することにより、採取した体液をそのまま検査に供するより、がん細胞を効率的に捕捉することが可能となる。従って、体液中のがん細胞の有無の確認、がん細胞数の計測、がん細胞の培養、薬の効き目の確認・選定を実施できる。 The medical examination device 1 (multi-well plate 1) of FIG. 1 is a device used for the purpose of capturing cancer cells, and is a multi-well plate 1 in which wells 11 are arranged in a so-called matrix. The multi-well plate 1 has a plurality of wells 11 opened in a circular shape. The well 11 is a recess for injecting a sample having a reduced protein concentration in a body fluid such as blood, and by subjecting the injected sample to an examination, the collected body fluid is used as it is for an examination, and cancer cells are more efficient. It becomes possible to capture in. Therefore, it is possible to confirm the presence or absence of cancer cells in body fluids, measure the number of cancer cells, culture cancer cells, and confirm and select the efficacy of a drug.

体液中のたんぱく質濃度を減少させる方法は、公知の手法を使用でき、例えば、採取した体液を希釈する方法が挙げられる。ここで、希釈方法としては、ヒト血液のpH(約7.4)リン酸緩衝生理食塩水(PBS)等の緩衝溶液や、DMEM(ダルベッコ改変イーグル培地)等の液体培地、を用いる方法があり、具体的には、採取した体液に緩衝溶液を加えて希釈することや、液体培地に採取した体液を加えて希釈することで、採取した体液に比べて、たんぱく質濃度を減少させた試料を作製できる。 As a method for reducing the protein concentration in the body fluid, a known method can be used, and examples thereof include a method of diluting the collected body fluid. Here, as a dilution method, there is a method of using a buffer solution such as pH (about 7.4) phosphate buffered physiological saline (PBS) of human blood or a liquid medium such as DMEM (Dalveco modified eagle medium). Specifically, by adding a buffer solution to the collected body fluid to dilute it, or by adding the collected body fluid to a liquid medium and diluting it, a sample having a reduced protein concentration as compared with the collected body fluid is prepared. it can.

体液中のたんぱく質濃度を減少させる方法としては、採取した体液に遠心分離を施して上澄みを除去する方法も挙げられる。具体的には、採取した体液を遠心分離し、作製されたたんぱく質を含む上澄みを取り除くことにより、採取した体液に比べて、たんぱく質濃度を減少させた試料を作製できる。 As a method of reducing the protein concentration in the body fluid, there is also a method of centrifuging the collected body fluid to remove the supernatant. Specifically, by centrifuging the collected body fluid and removing the supernatant containing the produced protein, a sample having a reduced protein concentration as compared with the collected body fluid can be produced.

図1では、一例として、4行6列の24個のウェル11を有する24ウェルプレートを示しているが、マルチウェルプレート1は、ウェル11を少なくとも2つ以上有していれば良く、ウェル11の個数は任意である。24ウェルプレートの他には、ウェル11が、6個、96個、384個等の汎用マルチウェルプレートでも良い。 FIG. 1 shows, as an example, a 24-well plate having 24 wells 11 in 4 rows and 6 columns, but the multi-well plate 1 may have at least two wells 11 and wells 11. The number of is arbitrary. In addition to the 24-well plate, a general-purpose multi-well plate having 6, 96, 384 wells 11 may be used.

マルチウェルプレート1の構成材料としては、ポリアクリル酸メチル、ポリメタクリル酸メチル、ポリアクリル酸、ポリメタクリル酸等のアクリル樹脂(ポリアクリル樹脂)、シクロオレフィン樹脂(ポリシクロオレフィン)、カーボネート樹脂(ポリカーボネート)、スチレン樹脂(ポリスチレン)、ポリエチレンテレフタレート(PET)等のポリエステル樹脂、ポリジメチルシロキサン等が挙げられる。 The constituent materials of the multi-well plate 1 include acrylic resins (polyacrylic resins) such as methyl polyacrylate, polymethyl methacrylate, polyacrylic acid, and polymethacrylic acid, cycloolefin resins (polycycloolefins), and carbonate resins (polycarbonates). ), Polyethylene resin (polystyrene), polyester resin such as polyethylene terephthalate (PET), polydimethylsiloxane, and the like.

ウェル11は非貫通孔であり、マルチウェルプレート1の表面に開口されている。ウェル11には、開口から、体液中のたんぱく質濃度を減少させた試料が注入される。また、がん細胞の存在を確認した場合、がん細胞を培養するための培養液を注入することも可能である。 The well 11 is a non-through hole and is opened on the surface of the multi-well plate 1. A sample having a reduced protein concentration in the body fluid is injected into the well 11 through the opening. When the presence of cancer cells is confirmed, it is also possible to inject a culture solution for culturing cancer cells.

ウェル11の開口の直径R、深さDは、特に限定されず、通常のマルチウェルプレート1のR、Dを採用できる。図1では、マルチウェルプレート1の表面及び裏面に対して、ウェル11の内側面が略垂直であるが、ウェル11は、内側面が傾斜し、開口から底面にかけて窄まる形状でも良い。また、内側面が傾斜し、開口から底面にかけて拡がる形状でも良い。 The diameter R and depth D of the opening of the well 11 are not particularly limited, and the R and D of the ordinary multi-well plate 1 can be adopted. In FIG. 1, the inner surface of the well 11 is substantially perpendicular to the front surface and the back surface of the multi-well plate 1, but the well 11 may have a shape in which the inner surface is inclined and narrows from the opening to the bottom surface. Further, the shape may be such that the inner side surface is inclined and extends from the opening to the bottom surface.

図1では、ウェル11は円形に開口しているが、ウェル11の開口形状は任意であり、四角形等、任意の形状に開口したものでもよい。 In FIG. 1, the well 11 is opened in a circular shape, but the opening shape of the well 11 is arbitrary, and may be an arbitrary shape such as a quadrangle.

マルチウェルプレート1は、複数のウェル11が分離可能なものを好適に使用できる。複数のウェルを有する場合、がん細胞数計測用ウェルと、がん細胞培養用ウェルとに分離使用でき、例えば、計測用ウェルでがん細胞の存在の有無を確認した上で、存在が確認された場合に培養用ウェルでがん細胞を培養し、その細胞で薬の効き目を確認できる。 As the multi-well plate 1, a plate in which a plurality of wells 11 can be separated can be preferably used. When there are multiple wells, they can be used separately for the cancer cell number measurement well and the cancer cell culture well. For example, the presence or absence of cancer cells is confirmed in the measurement wells, and then the presence is confirmed. If so, the cancer cells can be cultured in the culture well, and the efficacy of the drug can be confirmed in the cells.

マルチウェルプレート1(医療用検査装置1)において、ウェル11の内側面は、少なくとも一部に親水性ポリマー層が形成されていることが好ましい。図1は、ウェルの底面及び側面の一部に親水性ポリマー層21が形成されている例を示している。 In the multi-well plate 1 (medical inspection device 1), it is preferable that a hydrophilic polymer layer is formed at least partially on the inner surface of the well 11. FIG. 1 shows an example in which a hydrophilic polymer layer 21 is formed on a part of the bottom surface and the side surface of the well.

ウェル11内に、体液中のたんぱく質濃度を減少させた試料を導入すると、これらに含まれるがん細胞が親水性ポリマー層21に吸着されると共に、血小板、赤血球等の吸着が抑制される。そのため、試料の導入後に所定時間保持し、次いで、洗浄することで、がん細胞を親水性ポリマー層21に吸着できる。そして、吸着されたがん細胞の数を測定することで、体液中のがん細胞数が判り、がん治療効果の確認等が期待される。 When a sample having a reduced protein concentration in the body fluid is introduced into the well 11, the cancer cells contained therein are adsorbed on the hydrophilic polymer layer 21 and the adsorption of platelets, erythrocytes and the like is suppressed. Therefore, the cancer cells can be adsorbed on the hydrophilic polymer layer 21 by holding the sample for a predetermined time after introducing the sample and then washing the sample. Then, by measuring the number of adsorbed cancer cells, the number of cancer cells in the body fluid can be known, and it is expected that the cancer therapeutic effect can be confirmed.

親水性ポリマー層21(親水性ポリマーにより形成される層)の膜厚(厚み)は、好ましくは2〜200nm、より好ましくは20〜180nmである。上記範囲内に調整することで、良好なタンパク質や細胞に対する低吸着性、がん細胞に対する選択的吸着性・接着性が得られる。 The film thickness (thickness) of the hydrophilic polymer layer 21 (layer formed by the hydrophilic polymer) is preferably 2 to 200 nm, more preferably 20 to 180 nm. By adjusting within the above range, good protein and low adsorption to cells, and selective adsorption and adhesion to cancer cells can be obtained.

親水性ポリマーは、親水性を有するものを適宜選択できる。例えば、1種又は2種以上の親水性モノマーの単独重合体及び共重合体、1種又は2種以上の親水性モノマーと他のモノマーとの共重合体等が挙げられる。前記単独重合体、共重合体としては、ポリアクリル酸、ポリアクリル酸エステル、ポリメタクリル酸、ポリメタクリル酸エステル、ポリアクリロイルモルホリン、ポリメタクリロイルモルホリン、ポリアクリルアミド、ポリメタクリルアミド等が挙げられる。 As the hydrophilic polymer, a hydrophilic polymer can be appropriately selected. For example, homopolymers and copolymers of one or more kinds of hydrophilic monomers and copolymers of one or more kinds of hydrophilic monomers and other monomers can be mentioned. Examples of the homopolymer and copolymer include polyacrylic acid, polyacrylic acid ester, polymethacrylic acid, polymethacrylic acid ester, polyacryloylmorpholine, polymethacryloylmorpholine, polyacrylamide, and polymethacrylamide.

親水性モノマーは、親水性基を有する各種モノマーを使用できる。親水性基は、例えば、アミド基、硫酸基、スルホン酸基、カルボン酸基、水酸基、アミノ基、アミド基、オキシエチレン基等、公知の親水性基が挙げられる。 As the hydrophilic monomer, various monomers having a hydrophilic group can be used. Examples of the hydrophilic group include known hydrophilic groups such as an amide group, a sulfate group, a sulfonic acid group, a carboxylic acid group, a hydroxyl group, an amino group, an amide group and an oxyethylene group.

親水性モノマーの具体例としては、(メタ)アクリル酸、(メタ)アクリル酸エステル、(メトキシエチル(メタ)アクリレート等のアルコキシアルキル(メタ)アクリレート、ヒドロキシエチル(メタ)アクリレート等のヒドロキシアルキル(メタ)アクリレート)、(メタ)アクリルアミド、環状基を有する(メタ)アクリルアミド誘導体((メタ)アクリロイルモルホリン等)、などが挙げられる。 Specific examples of the hydrophilic monomer include (meth) acrylic acid, (meth) acrylic acid ester, alkoxyalkyl (meth) acrylate such as (methoxyethyl (meth) acrylate), and hydroxyalkyl (meth) such as hydroxyethyl (meth) acrylate. ) Acrylate), (meth) acrylamide, (meth) acrylamide derivative having a cyclic group ((meth) acryloylmorpholin, etc.), and the like.

他のモノマーは、親水性ポリマーの作用効果を阻害しない範囲内で適宜選択すれば良い。例えば、スチレン等の芳香族モノマー、酢酸ビニル、温度応答性を付与できるN−イソプロピルアクリルアミドなどが挙げられる。 Other monomers may be appropriately selected within a range that does not interfere with the action and effect of the hydrophilic polymer. For example, aromatic monomers such as styrene, vinyl acetate, N-isopropylacrylamide that can impart temperature responsiveness, and the like can be mentioned.

なかでも、親水性ポリマーとしては、下記式(I)で表されるポリマー及びポリ(メタ)アクリロイルモルホリンからなる群より選択される少なくとも1種が好ましい。

Figure 0006886667
(式中、Rは水素原子又はメチル基、Rはアルキル基を表す。mは1〜5、nは繰り返し数を表す。) Among them, as the hydrophilic polymer, at least one selected from the group consisting of the polymer represented by the following formula (I) and poly (meth) acryloyl morpholine is preferable.
Figure 0006886667
(In the formula, R 1 represents a hydrogen atom or a methyl group, R 2 represents an alkyl group. M represents 1 to 5, and n represents the number of repetitions.)

のアルキル基の炭素数は、1〜10が好ましく、1〜5がより好ましい。なかでも、Rは、メチル基又はエチル基が特に好ましい。mは、1〜3が好ましい。n(繰り返し単位数)は、15〜1000が好ましく、30〜500がより好ましい。 The carbon number of the alkyl group of R 2 is 1 to 10 preferably 1 to 5 is more preferable. Of these, R 2 is particularly preferably a methyl group or an ethyl group. m is preferably 1 to 3. n (number of repeating units) is preferably 15 to 1000, more preferably 30 to 500.

また、親水性ポリマーとして、下記式(I−1)で表される化合物及び(メタ)アクリロイルモルホリンからなる群より選択される少なくとも1種の親水性モノマーと、他のモノマーとの共重合体も好適に使用できる。

Figure 0006886667
(式中、R、R、mは前記と同様。) Further, as the hydrophilic polymer, a copolymer of at least one hydrophilic monomer selected from the group consisting of the compound represented by the following formula (I-1) and (meth) acryloyl morpholine and another monomer is also available. Can be preferably used.
Figure 0006886667
(In the formula, R 1 , R 2 , and m are the same as above.)

親水性ポリマーの重量平均分子量(Mw)は、がん細胞に対する選択的吸着性・接着性の観点から、好ましくは4000〜150000、より好ましくは5000〜100000、更に好ましくは8000〜50000である。なお、本明細書において、Mwは、ゲルパーミエーションクロマトグラフィー(GPC)(東ソー(株)製GPC−8000シリーズ、検出器:示差屈折計、カラム:東ソー(株)製のTSKGEL SUPERMALTPORE HZ−M)による測定値を基に標準ポリスチレン換算により求めることができる。 The weight average molecular weight (Mw) of the hydrophilic polymer is preferably 4000 to 150,000, more preferably 5,000 to 100,000, and further preferably 8,000 to 50,000, from the viewpoint of selective adsorptivity and adhesiveness to cancer cells. In the present specification, Mw is gel permeation chromatography (GPC) (GPC-8000 series manufactured by Toso Co., Ltd., detector: differential refractometer, column: TSKGEL SUPERMALTPORE HZ-M manufactured by Toso Co., Ltd.). It can be obtained by standard polystyrene conversion based on the measured value according to.

医療用検査装置は、例えば、図1のウェル11を備えたマルチウェルプレート1、更に必要に応じて他の部材(部品)を付加することにより、製造できる。 The medical inspection device can be manufactured, for example, by adding a multi-well plate 1 provided with the well 11 of FIG. 1 and, if necessary, another member (part).

具体的には、親水性ポリマー層21が形成されたマルチウェルプレート1の場合、(1)親水性ポリマーを各種溶剤に溶解・分散した親水性ポリマー溶液・分散液を、ウェル11の内部に注入し、所定時間保持する方法、(2)該親水性ポリマー溶液・分散液をウェル11の内面に塗工(噴霧)する方法、等、公知の手法により、ウェル11の内面の全部又は一部に親水性ポリマー溶液・分散液をコーティングすることで、親水性ポリマーにより形成されるポリマー層が形成されたマルチウェルプレート1を製造できる。そして、得られたマルチウェルプレート1に、必要に応じて他の部品を追加することで、医療用検査装置を製造できる。 Specifically, in the case of the multi-well plate 1 on which the hydrophilic polymer layer 21 is formed, (1) a hydrophilic polymer solution / dispersion in which the hydrophilic polymer is dissolved / dispersed in various solvents is injected into the well 11. Then, by a known method such as a method of holding the hydrophilic polymer solution / dispersion for a predetermined time, a method of applying (spraying) the hydrophilic polymer solution / dispersion onto the inner surface of the well 11, all or a part of the inner surface of the well 11 is used. By coating the hydrophilic polymer solution / dispersion, the multi-well plate 1 on which the polymer layer formed of the hydrophilic polymer is formed can be manufactured. Then, by adding other parts to the obtained multi-well plate 1 as needed, a medical inspection device can be manufactured.

溶剤、注入方法、塗工(噴霧)方法などは、従来公知の材料及び方法を適用できる。
(1)、(2)の保持時間は、ウェル11の大きさ、導入する液種、等により適宜設定すれば良いが、5分〜10時間が好ましく、10分〜5時間がより好ましく、15分〜2時間が更に好ましい。保持後、適宜、余分な親水性ポリマー溶液・分散液を排出し、乾燥してもよい。
Conventionally known materials and methods can be applied to the solvent, injection method, coating (spraying) method, and the like.
The holding time of (1) and (2) may be appropriately set depending on the size of the well 11, the type of liquid to be introduced, etc., but is preferably 5 minutes to 10 hours, more preferably 10 minutes to 5 hours, and 15 minutes. Minutes to 2 hours are more preferred. After holding, the excess hydrophilic polymer solution / dispersion may be discharged and dried as appropriate.

以下、実施例に基づいて本発明を具体的に説明するが、本発明はこれらのみに限定されるものではない。 Hereinafter, the present invention will be specifically described based on Examples, but the present invention is not limited to these.

〔医療用検査装置(マルチウェルプレート)の製造〕
AIBN(アゾビスイソブチロニトリル)を用いて、2−メトキシエチルアクリレートを80℃で6時間熱重合し、ポリ2−メトキシエチルアクリレートを作製した(分子量Mn:約15000、Mw:約50000)。そして、得られたポリ2−メトキシエチルアクリレートの2.5W/V%メタノール溶液を作製した。
市販PMMA製プレート内に、作製したポリ2−メトキシエチルアクリレート溶液(2.5W/V%)を注入し、30分室温放置した後、液をピペットで吸出し、乾燥することで、図1の親水性ポリマー層が形成されたマルチウェルプレートを有する検査装置を作製した。
[Manufacturing of medical inspection equipment (multi-well plate)]
Using AIBN (azobisisobutyronitrile), 2-methoxyethyl acrylate was thermally polymerized at 80 ° C. for 6 hours to prepare poly2-methoxyethyl acrylate (molecular weight Mn: about 15,000, Mw: about 50,000). Then, a 2.5 W / V% methanol solution of the obtained poly2-methoxyethyl acrylate was prepared.
The prepared poly2-methoxyethyl acrylate solution (2.5 W / V%) is injected into a commercially available PMMA plate, left at room temperature for 30 minutes, and then the solution is sucked out with a pipette and dried to obtain the hydrophilicity shown in FIG. An inspection device having a multi-well plate on which a sex polymer layer was formed was prepared.

(実施例1)
PBS溶液(リン酸緩衝生理食塩水)に線維肉腫(HT−1080)を懸濁させて、細胞数を血球計測管でカウントした後、PBS溶液内の細胞濃度がある値A1になるように更にPBS溶液を加えて、細胞濃度を調整した。次に、播種密度(濃度)が2850cells/cmに計算上なるように血液を混濁させた。この場合、血液と等量のPBS溶液を加えたことになった。
(Example 1)
After suspending fibrosarcoma (HT-1080) in PBS solution (phosphate buffered saline) and counting the number of cells with a blood cell counter, the cell concentration in the PBS solution is further increased to a certain value A1. PBS solution was added to adjust cell concentration. Next, the blood was turbid so that the seeding density (concentration) was calculated to be 2850 cells / cm 2. In this case, the same amount of PBS solution as blood was added.

(実施例2)
PBS溶液(リン酸緩衝生理食塩水)に線維肉腫(HT−1080)を懸濁させて、細胞数を血球計測管でカウントした後、PBS溶液内の細胞濃度がある値A2になるように更にPBS溶液を加えて、細胞濃度を調整した。次に、播種密度(濃度)が2850cells/cmに計算上なるように血液を混濁させた。この場合、血液と血液の2倍量のPBS溶液を加えたことになった。
(Example 2)
After suspending fibrosarcoma (HT-1080) in PBS solution (phosphate buffered saline) and counting the number of cells with a blood cell counter, the cell concentration in the PBS solution is further increased to a certain value A2. PBS solution was added to adjust cell concentration. Next, the blood was turbid so that the seeding density (concentration) was calculated to be 2850 cells / cm 2. In this case, blood and twice the amount of PBS solution of blood were added.

(実施例3)
DMEM(液体培地)に線維肉腫(HT−1080)を懸濁させて、細胞数を血球計測管でカウントした後、DMEM内の細胞濃度がある値A1になるように更にDMEMを加えて、細胞濃度を調整した。次に、播種密度(濃度)が2850cells/cmに計算上なるように血液を混濁させた。この場合、血液と等量のDMEMを加えたことになった。
(Example 3)
Fibrosarcoma (HT-1080) is suspended in DMEM (liquid medium), the number of cells is counted with a blood cell measuring tube, and then DMEM is further added so that the cell concentration in DMEM becomes a certain value A1, and the cells are added. The concentration was adjusted. Next, the blood was turbid so that the seeding density (concentration) was calculated to be 2850 cells / cm 2. In this case, DMEM equivalent to blood was added.

(実施例4)
DMEM(液体培地)に線維肉腫(HT−1080)を懸濁させて、細胞数を血球計測管でカウントした後、DMEM内の細胞濃度がある値A2になるように更にDMEMを加えて、細胞濃度を調整した。次に、播種密度(濃度)が2850cells/cmに計算上なるように血液を混濁させた。この場合、血液と血液の2倍量のDMEMを加えたことになった。
(Example 4)
Fibrosarcoma (HT-1080) is suspended in DMEM (liquid medium), the number of cells is counted with a blood cell measuring tube, and then DMEM is further added so that the cell concentration in DMEM becomes a certain value A2, and the cells are added. The concentration was adjusted. Next, the blood was turbid so that the seeding density (concentration) was calculated to be 2850 cells / cm 2. In this case, blood and twice the amount of DMEM of blood were added.

(実施例5)
線維肉腫(HT−1080)を剥離液を用いて懸濁させ、一部をPBS溶液に混濁させて、細胞数を血球計測管でカウントした後、この値を用いて、血液に線維肉腫(HT−1080)の入った剥離液を混濁させた。このとき、播種密度(濃度)が2850cells/cmに計算上なるように血液を混濁させた。次に、混濁させた血液に遠心分離(3000rpm、10分)を行い、上澄みを捨てて、残った血液を取り出した。
(Example 5)
Fibrosarcoma (HT-1080) is suspended with a stripping solution, part of it is turbid in PBS solution, the number of cells is counted with a hemocytometer, and then this value is used to add fibrosarcoma (HT) to the blood. The stripping solution containing −1080) was turbid. At this time, the blood was turbid so that the seeding density (concentration) was calculated to be 2850 cells / cm 2. Next, the turbid blood was centrifuged (3000 rpm, 10 minutes), the supernatant was discarded, and the remaining blood was taken out.

(実施例6)
線維肉腫(HT−1080)を剥離液を用いて懸濁させ、一部をPBS溶液に混濁させて、細胞数を血球計測管でカウントした後、この値を用いて、血液に線維肉腫(HT−1080)の入った剥離液を混濁させた。このとき、播種密度(濃度)が2850cells/cmに計算上なるように血液を混濁させた。次に、混濁させた血液を遠心分離(3000rpm、5分)を行い、上澄みを捨てて、残った血液を取り出した。
(Example 6)
Fibrosarcoma (HT-1080) is suspended with a stripping solution, part of it is turbid in PBS solution, the number of cells is counted with a hemocytometer, and then this value is used to add fibrosarcoma (HT) to the blood. The stripping solution containing −1080) was turbid. At this time, the blood was turbid so that the seeding density (concentration) was calculated to be 2850 cells / cm 2. Next, the turbid blood was centrifuged (3000 rpm, 5 minutes), the supernatant was discarded, and the remaining blood was taken out.

(実施例7)
線維肉腫(HT−1080)を剥離液を用いて懸濁させ、一部をPBS溶液に混濁させて、細胞数を血球計測管でカウントした後、この値を用いて、血液に線維肉腫(HT−1080)の入った剥離液を混濁させた。このとき、播種密度(濃度)が2850cells/cmに計算上なるように血液を混濁させた。次に、混濁させた血液を遠心分離(1500rpm、10分)を行い、上澄みを捨てて、残った血液を取り出した。
(Example 7)
Fibrosarcoma (HT-1080) is suspended with a stripping solution, part of it is turbid in PBS solution, the number of cells is counted with a hemocytometer, and then this value is used to add fibrosarcoma (HT) to the blood. The stripping solution containing −1080) was turbid. At this time, the blood was turbid so that the seeding density (concentration) was calculated to be 2850 cells / cm 2. Next, the turbid blood was centrifuged (1500 rpm, 10 minutes), the supernatant was discarded, and the remaining blood was taken out.

(比較例1)
線維肉腫(HT−1080)を剥離液を用いて懸濁させ、一部をPBS溶液に混濁させて、細胞数を血球計測管でカウントした後、この値を用いて、血液に線維肉腫(HT−1080)の入った剥離液を混濁させた。このとき、播種密度(濃度)が2850cells/cmに計算上なるように血液を混濁させた。
(Comparative Example 1)
Fibrosarcoma (HT-1080) is suspended with a stripping solution, part of it is turbid in PBS solution, the number of cells is counted with a hemocytometer, and then this value is used to add fibrosarcoma (HT) to the blood. The stripping solution containing −1080) was turbid. At this time, the blood was turbid so that the seeding density (concentration) was calculated to be 2850 cells / cm 2.

実施例、比較例で作製した検査試料(採取した血液に比べ、たんぱく質濃度を減少させた試料)を図1の医療用検査装置に供し、以下の方法で評価した。 The test samples prepared in Examples and Comparative Examples (samples having a reduced protein concentration as compared with the collected blood) were subjected to the medical test apparatus shown in FIG. 1 and evaluated by the following method.

〔親水性ポリマー層(コーティング層)の膜厚〕
ウェル内面の親水性ポリマー層の膜厚は、TEMを使用し、加速電圧15kV、1000倍で測定(撮影)した。
[Film thickness of hydrophilic polymer layer (coating layer)]
The film thickness of the hydrophilic polymer layer on the inner surface of the well was measured (photographed) using a TEM at an acceleration voltage of 15 kV and 1000 times.

〔がん細胞数の計測〕
各検査試料(がん細胞含有血液)をウェルに1mlずつ注入し、37℃で1時間接着させた。その後、PBS溶液で未接着の細胞を洗浄した。次いで、免疫染色を行い、蛍光顕微鏡で接着したがん細胞数をカウントトした。なお、比較例1の接着数を1.0として、相対値で比較した。
[Measurement of cancer cell number]
Each test sample (cancer cell-containing blood) was injected into a well in an amount of 1 ml and adhered at 37 ° C. for 1 hour. The unadhered cells were then washed with PBS solution. Then, immunostaining was performed and the number of cancer cells adhered with a fluorescence microscope was counted. In addition, the number of adhesions of Comparative Example 1 was set to 1.0, and the comparison was made by relative values.

Figure 0006886667
Figure 0006886667

採取した血液をそのまま検査に供した比較例1に比べ、PBS溶液や液体培地を用いて血液を希釈したり、血液に遠心分離処理を施して上澄みを除去することで、たんぱく質濃度を減少させた試料を供した実施例の方が、がん細胞接着量が大幅に増加することが明らかとなった。 Compared with Comparative Example 1 in which the collected blood was used as it was for the test, the protein concentration was reduced by diluting the blood with a PBS solution or a liquid medium or centrifuging the blood to remove the supernatant. It was clarified that the amount of cancer cell adhesion was significantly increased in the examples to which the sample was provided.

1 医療用検査装置(マルチウェルプレート)
11 ウェル
21 親水性ポリマー層
1 Medical inspection device (multi-well plate)
11 wells 21 hydrophilic polymer layer

Claims (3)

体液中に含まれるがん細胞捕捉方法であって、
採取した体液のアルブミン濃度を減少させた後、親水性ポリマー層にがん細胞を捕捉させ、
前記親水性ポリマー層は、非貫通孔のウェルの内側面の少なくとも一部に形成されており、
アルブミン濃度を減少させる方法が、採取した体液に遠心分離を施して上澄みを除去するものであり、
前記親水性ポリマー層は、
下記式(I)で表されるポリマー、及び、
下記式(I−1)で表される化合物と他のモノマーとの共重合体
からなる群より選択される少なくとも1種の親水性ポリマーで形成されているがん細胞捕捉方法。
Figure 0006886667
(式中、R は水素原子又はメチル基、R はアルキル基を表す。mは1〜5、nは繰り返し数を表す。)
Figure 0006886667
(式中、R 、R 、mは前記と同様。)
It is a method of capturing cancer cells contained in body fluids.
After reducing the albumin concentration in the collected body fluid, the hydrophilic polymer layer was used to capture the cancer cells.
The hydrophilic polymer layer is formed on at least a part of the inner surface of the well of the non-through hole .
The method of reducing the albumin concentration is to centrifuge the collected body fluid to remove the supernatant.
The hydrophilic polymer layer is
The polymer represented by the following formula (I) and
Copolymer of a compound represented by the following formula (I-1) and another monomer
A method for capturing cancer cells formed of at least one hydrophilic polymer selected from the group consisting of.
Figure 0006886667
(In the formula, R 1 represents a hydrogen atom or a methyl group, R 2 represents an alkyl group. M represents 1 to 5, and n represents the number of repetitions.)
Figure 0006886667
(In the formula, R 1 , R 2 , and m are the same as above.)
体液が血液である請求項1載のがん細胞捕捉方法。 Cancer cell acquisition method of claim 1 Symbol mounting body fluid is blood. 親水性ポリマー層の厚みが2〜200nmである請求項1又は2記載のがん細胞捕捉方法。 The cancer cell capture method according to claim 1 or 2, wherein the hydrophilic polymer layer has a thickness of 2 to 200 nm.
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