WO2016013395A1 - 細胞分散計測機構及びそれを用いた細胞継代培養システム - Google Patents
細胞分散計測機構及びそれを用いた細胞継代培養システム Download PDFInfo
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- WO2016013395A1 WO2016013395A1 PCT/JP2015/069617 JP2015069617W WO2016013395A1 WO 2016013395 A1 WO2016013395 A1 WO 2016013395A1 JP 2015069617 W JP2015069617 W JP 2015069617W WO 2016013395 A1 WO2016013395 A1 WO 2016013395A1
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- dispersion
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Definitions
- the present invention relates to a cell dispersion measurement mechanism, an automatic cell culture apparatus including the same, and a cell dispersion measurement method.
- Patent Documents 1 and 2 a method has been proposed in which the number of cells, cell concentration, and the like are calculated based on image data of cultured cells, and the timing for performing a medium replacement operation or a subculture operation is determined. Yes. Normally, cells that have just been detached from the culture vessel by the action or mechanical action of enzymes or polymer membranes are clumped due to cell-cell adhesion, and are separated by rocking or pipetting the vessel. Necessary (cell dispersion work). However, Patent Documents 1 and 2 do not specify cell dispersion work. In addition, calculating the number of cells based on image data with a limited microscope field for a cell suspension that is not sufficiently dispersed tends to cause a large error in the estimated total number of cells.
- Patent Document 3 describes a cell culture device that can automate the collection of cultured cells and can efficiently perform subculture.
- the cultured cell group peeled from the wall surface in the culture container is circulated through a thin tube interposed in a distribution means connected to the outlet of the culture container, so that the cells of the cultured cell group A cell dispersion step is described in which the adhesion is removed and the cultured cells are dispersed in a fluid container.
- the cell culture device described in Patent Document 3 does not have a mechanism for calculating the number of cells and the cell concentration in the cell suspension obtained in the cell dispersion step. If a cell suspension in which the number of cells and the cell concentration are not accurately measured is used, a difference in the state of the cells after the subculture operation tends to occur.
- Japanese Patent No. 4402249 US Patent Application Publication No. 2011/0211058 A1 Specification Japanese Patent No. 4775218
- the present invention relates to a cell dispersion measuring mechanism that can sufficiently disperse cells and accurately measure the number of cells or the cell concentration, and an automatic cell culturing apparatus including the same, as well as cells
- An object is to provide a distributed measurement method.
- the present inventor circulated a cell suspension in a flow channel, and the number or concentration of cells contained in the cell suspension flowing in the circulation flow channel and / or Alternatively, the present inventors have found that the number of cells contained in a cell suspension or the concentration of cells can be accurately measured by measuring the degree of cell dispersion over time, thereby completing the present invention.
- the present invention includes the following aspects.
- a cell measuring instrument comprising a measuring means for measuring the degree of cell dispersion over time while mixing a cell suspension using a liquid driving means.
- a cell dispersion measuring mechanism comprising the cell measuring instrument according to 1 and a dispersion unit that disperses a cell mass contained in a cell suspension.
- 3. The cell dispersion measuring mechanism according to 2 above, wherein the measuring means measures by scattered light intensity or transmittance. 4). 4.
- the cell dispersion measurement mechanism according to 2 or 3 above, wherein the dispersion unit generates a shearing force in the cell suspension. 5.
- the cell dispersion measuring mechanism according to 4 above, wherein the shear force is generated by a flow path having a reduced cross-sectional area. 6).
- 6. The cell dispersion measurement mechanism according to 5, further comprising a cell dispersion measurement mechanism control unit that controls at least the liquid driving unit based on data obtained by the cell measurement device, wherein the control unit is obtained by the cell measurement unit. Based on the obtained data, it is determined whether or not the cells have reached a predetermined degree of dispersion.
- the liquid suspension is driven so that the cell suspension passes through the flow path having the reduced cross-sectional area.
- the above-mentioned cell dispersion measuring mechanism characterized in that the means is driven. 7).
- the flow path having a reduced cross-sectional area is provided by a flow path crusher that presses the flow path made of an elastic material to arbitrarily set the degree of narrowing of the flow path, and the control means is obtained by a cytometer. 7.
- the flow path has at least two or more flow paths in parallel, and has a parallel flow path configured to select a part of the flow paths by the switching valve and pass the cell suspension. 7.
- the cell dispersion measuring mechanism according to 6 above wherein the channel having a reduced area is provided in at least one channel included in the parallel channel.
- the automatic cell culture device comprising an automatic cell culture device controller that stores a cell growth rate and adjusts a cell suspension to a predetermined concentration determined based on the growth rate. 12 Circulating the cell suspension in the channel, dispersing the cell mass contained in the cell suspension, and the number or concentration of cells contained in the cell suspension flowing in the circulation channel; A cell dispersion measurement method comprising a step of measuring the degree of cell dispersion over time. 13 13. The cell dispersion measuring method according to 12 above, wherein in the measurement step, measurement is performed based on scattered light intensity or transmittance. 14 14. The cell dispersion measurement method according to 12 or 13, wherein in the dispersion step, a shear force is generated in the cell suspension. 15. 15. The cell dispersion measurement method according to 14 above, wherein the shear force is generated by a flow path having a reduced cross-sectional area.
- the mechanism and method of the present invention since the cell suspension is made uniform and measured, there is no variation associated with sampling, and an accurate cell number or cell concentration can be measured.
- FIG. 1 shows a first configuration example of an automatic cell culture device according to the present invention.
- 2 shows the time-dependent change in scattered light intensity of Caco-2 cells accompanying the dispersion treatment according to the present invention.
- a calibration curve of Caco-2 cell concentration and scattered light intensity is shown.
- a calibration curve of the concentration of latex particles having a particle diameter of 10 ⁇ m and scattered light intensity is shown.
- FIG. 2 shows a second configuration example of an automatic cell culture device according to the present invention.
- 3 shows a third configuration example of an automatic cell culture device according to the present invention.
- distribution measuring mechanism of this invention is shown.
- distribution mechanism in this invention is shown.
- distribution mechanism of FIG. 9 is shown.
- the optimal conditions are those with the smallest number of cell masses.
- the present invention provides a flow path for allowing a cell suspension to flow, a liquid driving means for feeding the cell suspension in the flow path, and a cell suspension flowing in the flow path.
- the present invention relates to a cell measuring instrument including a measuring unit that measures the number of cells or the cell concentration and / or the degree of cell dispersion over time using a liquid driving unit while mixing a cell suspension.
- the channel may be an annular channel or a linear channel described below with reference to FIG.
- the liquid driving means is not particularly limited.
- a water flow may be generated in the flow path by a rotating means such as a screw provided in the flow path, or the liquid may be sent by applying pressure from the outside.
- a peristaltic pump that moves the fluid by squeezing the flow path from the outside can be cited.
- cell dispersion means that a cell mass formed by cell-cell adhesion is divided into individual cells.
- Cell dispersity means the degree of cell dispersal contained in a cell suspension. The smaller the cell mass in the cell suspension, the higher the degree of dispersion, and vice versa. The degree is low.
- the means and method for dispersing cells are not particularly limited. It may be dispersed by chemical means such as proteolytic enzymes such as trypsin, collagenase, and dispase, or may be dispersed by physical means such as vortexing, pipetting, stirring, etc. May be combined.
- the dispersion of the cell mass contained in the cell suspension may be performed by feeding or circulating the cell suspension, for example, by a water flow accompanying the feeding or circulation. Circulation also serves as a decentralization role. Therefore, in the cell dispersion measuring mechanism of the present invention, liquid driving and dispersion may be performed by the same means. Similarly, in the cell dispersion measuring method of the present invention, the circulation of the cell suspension and the dispersion of the cell mass may be performed by the same process.
- the present invention also relates to a cell dispersion measuring mechanism comprising the above cell measuring instrument and a dispersing means for dispersing a cell mass contained in a cell suspension.
- the cells may be dispersed by generating a shearing force in the cell suspension, and the shearing force is generated by a flow path having a reduced cross-sectional area (also referred to as “stenosis” in the present specification). Can be generated.
- a part with a small cross-sectional area of the flow path may be used, or a part of the cross-sectional area of the flow path may be reduced by providing a partition plate such as an orifice.
- the channel having a reduced cross-sectional area may have a cross-sectional area that is, for example, 1.1 to 100 times, 2 to 10 times, particularly 3 to 5 times smaller than the cross-sectional area of the channel.
- the diameter of the reduced cross-sectional area may be about 0.05-2 mm, about 0.1 mm-1 mm, especially about 0.5-0.8 mm.
- the diameter of the reduced cross-sectional area can be changed as appropriate according to the size of cells, adhesiveness, and the like.
- the degree of cell dispersion depends on various conditions, for example, when the stenosis is used as a dispersion means, the number of stenosis, the inner diameter of the stenosis, the length of the stenosis, the number of times that the cell passes through the stenosis, It can be prepared depending on the inner diameter of the channel.
- the constricted portion may be formed by a channel crusher that can control the amount of channel crushing.
- the channel crusher has a function of crushing an elastic channel from the outside, and does not completely close like a pinch valve, but crushes the channel while maintaining a certain gap.
- the flow path crusher is preferably controlled by the control unit. By changing the crushing amount of the flow path, the shearing force applied to the cell clump of the cell suspension flowing inside can be changed. In addition, if the cell agglomeration is still large, cells may be clogged if the cross-sectional area of the narrow portion of the flow path is too small, but a flow path crusher that can change the flow volume of the flow path When used, such a problem can be avoided by selecting an appropriate channel crushing amount.
- control unit controls the flow path crusher based on the data on the cell dispersion degree obtained from the cell dispersion measurement mechanism to change the flow volume crushing amount.
- a channel crusher allows the gap to change from a fully open state where the channel is not crushed at all to a state where the channel is completely crushed and closed, and the size of the gap is positioned like a stepping motor. It can be controlled using a possible actuator.
- the gap may be determined by sandwiching a member that serves as an index of the gap amount. Such a member may be adapted to accommodate a plurality of gap amounts.
- a flow path crusher may be employed instead of the orifice.
- two or more parallel flow paths with different dispersion means may be provided so that the flow path can be selected by a switching valve.
- the cell clump is passed to a certain extent so that it passes through the orifice having a large diameter. If it is determined that it has been loosened, it can pass through a smaller orifice. Selection of the flow path can be performed by controlling the switching valve by the control unit.
- the method for measuring the number or concentration of cells and / or the degree of cell dispersion contained in the cell suspension is not particularly limited.
- an observation window is provided in the flow path, an image is captured with a microscope equipped with a CCD camera, and measured from the image, or measured from scattered light intensity or transmittance by a flow cell and a light source. You may measure by fluorescence.
- the higher the cell number or cell concentration the higher the scattered light intensity and the lower the transmittance.
- the degree of cell dispersion based on scattered light intensity or transmittance when measuring the degree of cell dispersion based on scattered light intensity or transmittance, the higher the degree of cell dispersion, the smaller the variation in the measured value, and the smaller the change in the measured value associated with the dispersion process.
- the measurement based on the scattered light intensity or transmittance can be processed quickly, and the cell measurement based on image data with limited microscope field of view is superior to the cell measurement dynamic range and reproducibility. It is preferable because it can measure the degree of cell dispersion.
- the quantification of the cell suspension is not particularly limited.
- it can be performed by the same method as the quantification of the colorimetric analysis of the solution. That is, using the same cells or beads of the same particle size in advance, the scattered light intensity or transmittance of several types of known concentration samples is measured to prepare a calibration curve.
- the cell concentration can be calculated by substituting the scattered light intensity or transmittance obtained from the cell suspension of unknown concentration into the correlation equation.
- the cell dispersion measuring mechanism of the present invention measures the number of cells or the cell concentration and / or the degree of cell dispersion contained in a cell suspension over time.
- “measuring with time” means measuring with the passage of time.
- the measurement over time may be a continuous measurement or a discontinuous measurement with a measurement interval.
- the measurement interval in the discontinuous measurement is not particularly limited, and may be, for example, every 0.01 seconds to 50 seconds, every 0.1 seconds to 5 seconds, especially every 1 second to 2 seconds.
- the present invention relates to an expansion culture mechanism for culturing and proliferating cells and peeling the proliferated cells, a cell dispersion measurement mechanism for dispersing and measuring cells detached by the expansion culture mechanism, and the cell dispersion measurement.
- An automatic cell culture apparatus having a cell seeding mechanism for feeding a cell suspension dispersed by a mechanism to the expansion culture mechanism.
- the automatic cell culture apparatus stores a cell growth rate and stores cell suspension.
- An automatic cell culture device controller that adjusts the suspension to a predetermined concentration determined based on the growth rate;
- the “cell growth rate” means the rate at which cells increase or decrease over time.
- the growth rate can be represented, for example, by a cell growth curve.
- the “predetermined concentration” means a cell concentration capable of growing to a desired number of cells after culturing for a certain time. For example, if a plate containing 50% confluent cells is required in a culture container with a bottom area of 78.5 cm 2 after 2 days, the concentration of the cell suspension that grows to the number of cells in the culture container after 2 days is “ It is a “predetermined concentration”.
- the predetermined concentration can be determined, for example, from a cell growth curve.
- “adjust to a predetermined concentration” means, for example, when the concentration of a cell suspension is higher than a predetermined concentration, to a predetermined concentration with a diluent such as physiological saline, culture solution, and PBS.
- a diluent such as physiological saline, culture solution, and PBS.
- the concentration of the cell suspension is the same or lower than the predetermined concentration, it means not diluting or concentrating to the predetermined concentration.
- the above-described prediction function based on the growth rate is used to accurately determine the desired number of cells at the desired date and time in the subculture. Can get to.
- the expansion culture mechanism may have one or two or more culture vessels. When two or more culture vessels are present, each culture vessel may have a different size, shape, material, and the like. Although a culture container will not be specifically limited if a cell is propagated, For example, a culture plate, a culture flask, etc. may be sufficient.
- the cell seeding mechanism may send the cell suspension to a culture vessel that has been washed after use, or may send the cell suspension to a new cell culture vessel.
- the cell suspension may be taken out from any of the expansion culture mechanism, the cell dispersion measurement mechanism, or the cell seeding mechanism and used for other cultures and assays.
- the automatic cell culture apparatus according to the present invention may have an acquisition mechanism for taking out a cell suspension from any of an expansion culture mechanism, a cell dispersion measurement mechanism, or a cell seeding mechanism.
- the present invention provides a step of circulating a cell suspension in a flow path, a step of dispersing cell clumps contained in the cell suspension, and a cell suspension flowing in the circulation flow path.
- the present invention relates to a cell dispersion measuring method including a step of measuring the number or concentration of cells contained and / or the degree of cell dispersion over time.
- the cell dispersion measurement method may or may not use the cell dispersion measurement mechanism according to the present invention.
- the process of dispersing a cell suspension from a state in which there are many cell clumps is monitored in real time, so that the dispersion operation can be controlled so as to obtain a necessary and sufficient degree of cell dispersion. it can.
- damage to the cells can be minimized, and the cell viability can be maintained at the maximum.
- the cell suspension is sufficiently dispersed and maintained in a uniform state, it is possible to prevent variations between subcultures caused by the sedimentation of the cells and the difference in the degree of dispersion during the feeding.
- the automatic cell culture apparatus of the present invention can save labor because it can automate all cell subculture operations, and can reduce human errors caused by differences in the skill level of workers.
- FIG. 1 schematically shows a first configuration example of an automatic cell culture device according to the present invention.
- the automatic cell culturing apparatus 1 is a cell culturing device for culturing and proliferating, an expansion culture mechanism 15 for detaching the proliferated cells, a cell dispersion measuring mechanism 16 for dispersing and measuring the cells detached by the expansion culture mechanism, the cells A cell seeding mechanism 17 for feeding the cell suspension dispersed by the dispersion measuring mechanism to the expansion culture mechanism, and a control mechanism (not shown) are configured.
- the control mechanism also referred to as “control unit” or “control unit” in this specification
- An example of the control mechanism is a computer (computer) having a program for controlling individual means or mechanisms.
- cell dispersion measurement mechanism control means means means for controlling the cell dispersion measurement mechanism.
- the cell dispersion measurement mechanism control means determines the amount of diluent necessary to make the cell number concentration a desired concentration based on the data obtained by the cell counter, and uses the required amount of diluent in the flow path.
- the liquid drive means can be driven to take up and mix the cell suspension and diluent. Further, the cell dispersion measurement mechanism control means determines whether or not the cells have reached a predetermined degree of dispersion based on data obtained by the cell counter, and if not, the cell suspension However, the liquid driving means may be driven so as to pass through the constriction.
- the “automatic cell culture device controller” means a portion that controls the automatic cell culture device.
- the automatic cell culture device control unit is configured to adjust the cell suspension to a predetermined concentration based on data obtained by, for example, a cell counter, and to arrange valves and / or liquids arranged in flow paths connecting the mechanisms. Control the drive.
- the expansion culture mechanism 15 is stored in a CO 2 incubator.
- the cell dispersion measuring mechanism 16 and the cell seeding mechanism 17 may also be stored in a CO 2 incubator.
- the entire flow path of the automatic cell culture device 1 is closed and sterile, and the air introduced into the flow path during operation passes through the HEPA filter, so cell culture including cell passage operation is aseptically performed. Can be implemented.
- Cells to be cultured in the expansion culture vessel 2 are introduced from the cell supply means 10 using a syringe pump or the like that is a liquid driving means. Thereafter, an appropriate amount of the culture solution is introduced by the culture solution supply means 3, and the cell is shaken by the automatic drive system so that the cells have a uniform concentration in the culture solution, and then left to stand in a CO 2 incubator. Incubate for several days under appropriate conditions (eg 37 ° C., 5% CO 2 concentration). Meanwhile, the area occupied by the bottom surface of the cell in the expanded culture container 2 is observed by microscopic observation, and is grown until the cell growth rate does not decrease (before becoming 100% confluent).
- appropriate conditions eg 37 ° C., 5% CO 2 concentration
- a washing solution suitable for cells such as PBS (Phosphate Buffered Saline) or HEPES (4- (2-hydroxyethyl) -1-piperazineethanesulfonic acid) buffer introduced from the cell washing solution supply means 11, Remove dead cells and debris.
- proteolytic enzymes such as trypsin, collagenase, dispase and the like are introduced from the cell detachment solution supply means 12, and left at 37 ° C. for a certain period of time. Proteins such as integrins that adhere the cells and the bottom of the culture vessel are decomposed by the enzyme, and the cells are detached from the expansion culture vessel 2.
- the enzyme does not completely decompose the protein adhering between cells, there are many cell clumps after cell detachment.
- the activity of the cells is weakened, the growth after seeding becomes worse, and the number of dead cells increases. Therefore, it is necessary to determine the optimum detachment conditions.
- the automatic cell culture device controller By storing these conditions in the automatic cell culture device controller, the optimum cell detachment operation can be performed automatically.
- an enzyme activity inhibitor such as a trypsin inhibitor or a culture solution is introduced from the cell detachment solution inhibitor supply means 13 in order to stop the activity of the proteolytic enzyme. This reduces damage to the cells due to enzyme activity.
- the cell detachment sample supplied from the expansion culture vessel 2 is collected and sent to the sample introduction means 4. If there is a lot of cell residue on the bottom surface of the expansion culture vessel 2, the recovery rate is obtained by washing the bottom surface of the vessel with the culture solution introduced from the culture solution supply means 3 several times, sending it to the sample introduction means 4 and collecting it. Can also be increased.
- the collected cell detachment sample preferably the entire amount thereof, is introduced as a cell suspension into the annular pipe of the cell dispersion measuring mechanism 16 using a syringe pump or the like that is a liquid driving means.
- Dispersing means 5, measuring means 6, and peristaltic pump 7 that is a liquid driving means are provided in an annular pipe that is a circulation channel.
- Most of the cells contained in the cell suspension before being processed by the cell dispersion measuring mechanism 16 are in a state of several tens to a sheet-like mass.
- a dispersion effect equivalent to or better than pipetting can be obtained.
- Conditions necessary for cell dispersion vary depending on cell size, adhesiveness, and the like, and the dispersion conditions can be appropriately changed depending on the cell type.
- the automatic cell culture device controller stores in advance the relationship between the degree of dispersion of the cells to be used and the measured values, and from the results of monitoring changes over time in the measured values of the cells, the optimal state for seeding the cells If judged, the cell dispersion measurement mechanism and the cell seeding mechanism are controlled so that the three-way valve 8 is switched and the cell suspension is sent to the cell seeding sample preparation means 9.
- the automatic cell culture device control unit calculates the concentration of the cell suspension from the measured value of the measuring means 6 based on the calibration curve stored in advance.
- the automatic cell culture device control unit calculates the number and concentration of seeded cells that can grow to the target number of cells after a certain period of time based on the growth curve stored in advance, and the cell suspension
- the cell dispersion measurement mechanism and the cell seeding mechanism are controlled so that the medium necessary for dilution is supplied from the medium supply means 3 and sent to the cell seeding sample preparation means 9 and mixed with the cell suspension.
- the mixing may be performed by circulating in the provided circulation pipe, or may be performed using a stir bar provided in the container.
- the peristaltic pump 7 is operated and fed, and injected into the expansion culture vessel 2.
- the cell suspension may be diluted by the cell seeding sample preparation means 9 as described above, or may be performed by the cell dispersion measuring mechanism 16.
- the diluent may be sent from the culture solution supply means 3 into the flow path of the cell dispersion measuring mechanism 16, or a diluent bag and a switching valve may be provided in a part of the flow path.
- the diluted solution may be fed into the flow path.
- Uptake of the cell suspension and the diluted solution may be performed once, or may be performed in a plurality of small portions. It is preferable to take it in multiple times because the two liquids can be mixed more easily and the burden on the cells can be reduced. At this time, if there is a sample reservoir 18 described below with reference to FIG. 6, mixing of the diluent is easy.
- the cells and the solution are uniformly introduced into the bottom of the container evenly by always shaking the container with an automatic drive system.
- the cells injected into the expansion culture vessel 2 can be cultured as described above and again subjected to passage.
- FIG. 6 shows a second configuration example of the automatic cell culture device of the present invention.
- An automatic cell culture device 20 shown in FIG. 6 is obtained by adding a sample reservoir 18 to the annular pipe of the cell dispersion measuring mechanism 16 shown in FIG. By using this flow path, even if the amount of the test cell suspension is increased or decreased, it is not necessary to replace the capacity of the annular pipe, and the cell suspension sample concentration after preparation of the seeded sample can be measured simultaneously. Can do.
- FIG. 7 shows a third configuration example of the automatic cell culture device of the present invention.
- the measurement means 6 measures the cell concentration, calculates the cell concentration, and introduces the culture solution from the culture solution supply means 3 to prepare the seeded cell concentration. To do.
- the automatic cell culture device 21 passes the stirring coil 19 to mix the sample.
- the cell dispersion measurement mechanism of the present invention can also measure the dispersion of cells cultured using a carrier such as beads.
- FIG. 8 shows an example of measurement of cells cultured using a carrier by the cell dispersion mechanism according to the present invention, wherein 22 is a cell, 23 is a culture carrier, the vertical axis is scattered light intensity, and the horizontal axis is time.
- FIG. 8 shows that the state in which cells cultured with a carrier leave the carrier by trypsin treatment and become single cells can be monitored by a change in scattered light intensity.
- Example 1 Cultivation and passage of Caco-2 cells using automatic cell culture apparatus 1> First, the operation in the expansion culture mechanism will be described.
- Caco-2 culture medium Minimum Essential Medium
- FBS Fetal Bovine Serum
- Caco-2 human colon cancer cell line
- Streptomycin 100 ⁇ g / mL
- Amphotericin B 0.25 ⁇ g / mL
- the cells were 80% confluent as a result of observation with an inverted microscope.
- automatic operation was performed in the expansion culture vessel 2 as follows. After removing the culture solution in the expansion culture vessel 2 by flowing it into the waste solution with the peristaltic pump 7, 3 mL of PBS was introduced from the cell washing solution supply means 11, and the expansion culture vessel 2 was shaken to spread over the entire bottom surface to wash the cells. After removing the PBS with a peristaltic pump 7, introduce 2mL of 0.25% trypsin-1mM EDTA from the cell detachment solution supply means 12, shake the expansion culture vessel 2 over the entire bottom, and leave it at 37 ° C for 4 minutes The cells were detached.
- the dispersing means 5, the measuring means 6, the peristaltic pump 7, and the three-way valve 8 are connected by a total of 520 mm silicon tubes having an inner diameter of 3.15 mm.
- the culture solution is introduced from the culture solution supply means 3, and the culture solution is filled in the annular channel.
- the tube presser of the peristaltic pump 7 is removed, and the culture solution is filled so that bubbles do not enter the channel while switching the three-way valve 8 in the annular channel.
- the whole amount (5 mL) of the cell suspension sample accumulated in the sample introduction means 4 is filled into the annular flow path.
- the culture solution pushed out at this time flows out to the cell seeding sample preparation means 9.
- the peristaltic pump 7 in the annular pipe is returned to its original state and the pump is operated, the filled cell suspension sample is circulated in the annular channel while passing through the dispersing means 5 and the measuring means 6.
- FIG. 2 shows that after passing through dispersion means 5 (orifice diameter 0.7 mm ⁇ length 1 mm) 10 times in one embodiment of the present invention 10 times, pipetting 10 times, or in an untreated cell suspension The abundance ratio of cell mass and single cell is shown. A micrograph was taken after each treatment, the number of cell masses or single cells in the cell suspension was counted by image processing, and the abundance ratio of single cells to 2 to 4 cell masses was converted into a bar graph. It was found that the dispersion method of the invention provided a dispersion effect equivalent to or better than that of manual pipetting.
- the scattered light intensity (wavelength 700 nm, measurement angle 20 degrees) was measured by the measuring means 6.
- the time-dependent change in scattered light intensity of Caco-2 cells is shown in FIG.
- the scattered light intensity was measured to change. That is, initially, the scattered light intensity measurement value of the cell suspension varies greatly, but each time it passes through the dispersion means 5, the dispersion of the scattered light intensity measurement value gradually decreases, and the measurement accompanying the dispersion process The change in value was also small. In particular, after about 160 seconds from the start of measurement, the variation in the measured value of the scattered light intensity and the change in the measured value accompanying the dispersion process became very small.
- the cells in the sample were dispersed after about 160 seconds from the start of measurement, and the cells were uniformly dispersed. It is preferable to be able to determine the optimum value of the dispersion time by the dispersion means 5 in this way because it is possible to prevent a decrease in cell activity caused by refluxing more than necessary.
- the cell concentration of the cell suspension was quantified by the following quantification method. That is, a calibration curve was prepared by measuring the scattered light intensity in several types of Caco-2 cells with known concentrations. Thereafter, the cell concentration of the cell suspension was calculated by substituting the measured scattered light intensity into the correlation equation. As a result, the concentration of the cell suspension was 1.2 ⁇ 10 6 cells / mL.
- FIG. 4 shows a calibration curve for Caco-2 cells.
- the optimum seeding cell concentration for obtaining the target cells was calculated by the automatic cell culture device control unit, and the necessary amount of culture solution was supplied from the culture solution supply means 3.
- the growth curve of Caco-2 cells previously input to the automatic cell culture device controller is used.
- the seeded cell concentration was automatically calculated, and 15 mL of the culture solution was supplied from the culture solution supply means 3.
- the culture solution and Caco-2 cells in the cell seeding sample preparation means 9 were mixed, and 10 mL each was seeded on two plates provided in the expansion culture container 2. Thus, cell passage work was automatically performed.
- the seeded cells were cultured for 2 days, and the proliferation rate and survival rate were examined.
- Example 2 Comparison of measurement methods using latex particles> Using latex particles, the measurement method using scattered light intensity was compared with the measurement method using a cell counter that is widely used in general. As the sample, latex particles having a known concentration (5.0 ⁇ 10 5 Particles / mL, 5 mL, solvent H 2 O) (manufactured by Polyscience, 10 ⁇ m, Lot No. 643763) were used.
- the sample was put in the sample introduction means 4, and a total amount of 5 mL was introduced into the annular pipe of the cell dispersion measurement mechanism 16 of one embodiment of the present invention.
- the peristaltic pump 7 was stopped and measured by the stopped flow method.
- a calibration curve of 0-1.0 ⁇ 10 6 Particles / mL of 10 ⁇ m latex particles is shown in FIG.
- the average concentration was 5.2 ⁇ 10 5 Particles / mL
- the standard deviation was 0.0017 ⁇ 10 5 Particles / mL
- the relative standard deviation RSD was 0.19%. It was.
- the measurement with the scattered light intensity was higher in accuracy and the variation was smaller than the measurement with the cell counter.
- the dispersion conditions include the flow path inner diameter, the inner diameter of the stenosis, the number of stenosis, the length of the stenosis, the flow rate, and the number of times the cell passes through the stenosis (flow rate and Calculated from operating hours).
- flow rate flow rate and Calculated from operating hours.
- FIG. 9 is an example of a cell dispersion measuring mechanism according to the present invention, in which the flow path is annular and the dispersion means 5 of FIG. 6 are arranged in parallel. By switching the multi-way (N-way) valve 24, one dispersion means can be selected.
- the undispersed NIH / 3T3 cells 3.0-4.0 ⁇ 10 6 cells collected in 20 mL of medium were placed in the sample reservoir 18, and the peristaltic pump 7 was operated to circulate, and automatic optimization was performed according to the following procedure.
- Dispersing means 5-1 is a case where there is no constriction, and as a whole consists of a 3.15 mmi.d. ⁇ 720 mm channel.
- constrictions orifices, etc.
- the constriction was changed by switching the flow path with the multi-way valve 24.
- the measurement means 6 measures the cell sample that has passed through the dispersion means 5-1, with the flow rate and the pump operating time fixed, and transmits the result to the control unit.
- a reference value is set in advance in the control unit and it is determined that the dispersion is insufficient, the multi-way valve 24 is switched to pass a new sample to the next dispersion unit 5-2.
- the control unit determines the degree of dispersion of the cell sample that has passed through the dispersing means 5-2, and if insufficient, further passes the sample in the order of 5-3, 5-4, and 5-5. This is continued until the result of the measuring means 6 clears the reference value. If neither condition clears the reference value, the dispersion means closest to the reference value is set as the optimum value.
- the inner diameter ⁇ length of the narrowed portion was optimally 0.4 mm i.d. ⁇ 30 mm.
- the flow rate was optimized.
- the peristaltic pump 7 was adjusted under the conditions of a constant stenosis and the pump operating time, and the cell sample was fed by changing the flow rate to 20 mL / min, 30 mL / min, and 40 mL / min.
- the flow velocity at which the degree of dispersion was closest to the reference value was taken as the optimum value.
- the flow rate was optimally 40 mL / min.
- the number of times the cells passed through the stenosis was optimized. Since the number of passes through the constriction can be calculated from the flow velocity and the pump operating time, the pump operating time was optimized. The degree of dispersion was evaluated with passage times of 90 sec, 180 sec, and 270 sec proportional to the number of passes, with the stenosis and the flow rate kept constant. As a result, 180 sec was optimal.
- the survival rate after 2 days was 95% or more.
- the same sample may be processed again after changing the dispersion conditions.
- it may be performed in the order of 1) reducing the inner diameter of the dispersing means, 2) increasing the flow rate of the peristaltic pump, and 3) increasing the length of the dispersing means.
- the number of cells or the cell concentration can be accurately measured by sufficiently dispersing the cells without the experience of a cell culture expert.
Abstract
Description
1.細胞懸濁液を通流させる流路、前記流路内の細胞懸濁液を送液する液体駆動手段、及び前記流路内で流動中の細胞懸濁液に含まれる細胞数若しくは細胞濃度及び/又は細胞の分散度を、液体駆動手段を用いて細胞懸濁液を混和させながら、経時的に測定する測定手段を含む細胞計測器。
2.上記1に記載の細胞計測器、及び細胞懸濁液に含まれる細胞塊を分散させる分散手段を備える、細胞分散計測機構。
3.前記測定手段が、散乱光強度又は透過率により測定する、上記2に記載の細胞分散計測機構。
4.前記分散手段が、細胞懸濁液にせん断力を発生させる、上記2又は3に記載の細胞分散計測機構。
5.前記せん断力は、断面積が減少した流路により発生する、上記4に記載の細胞分散計測機構。
6.前記細胞計測器により得たデータに基づいて少なくとも液体駆動手段を制御する細胞分散計測機構制御手段をさらに有する上記5に記載の細胞分散計測機構であって、前記制御手段は、細胞計測器により得たデータに基づいて細胞が所定の分散度に達したか否かを判断し、所定の分散度に達していない場合、細胞懸濁液が前記断面積が減少した流路を通過するよう液体駆動手段を駆動することを特徴とする、上記細胞分散計測機構。
7.断面積が減少した流路が、弾性素材からなる流路を圧迫して流路の狭窄度を任意に設定する流路潰し器により設けられたものであり、前記制御手段は細胞計測器により得たデータに基づいて流路潰し器を制御する、上記6に記載の細胞分散計測機構。
8.流路に、少なくとも2つ以上の流路が並列に設けられ、かつ切替え弁によりその一部の流路を選択して細胞懸濁液を通すように構成された並列流路を有し、断面積が減少した流路が並列流路に含まれる少なくとも1つの流路に設けられている、上記6に記載の細胞分散計測機構。
9.2つ以上の断面積が減少した流路が設けられており、各断面積が減少した流路の断面積が異なる、上記8に記載の細胞分散計測機構。
10.細胞を培養して増殖させ、増殖させた細胞を剥離させる拡大培養機構、前記拡大培養機構によって剥離された細胞を分散させ、測定する上記2~9のいずれかに記載の細胞分散計測機構、及び前記細胞分散計測機構によって分散させた細胞懸濁液を前記拡大培養機構に送液する細胞播種機構を有する自動細胞培養装置。
11.細胞の増殖速度を記憶し、細胞懸濁液を前記増殖速度に基づいて定められた所定の濃度に調整する自動細胞培養装置制御部を含む、上記10に記載の自動細胞培養装置。
12.流路において細胞懸濁液を循環する工程、前記細胞懸濁液に含まれる細胞塊を分散させる工程、及び前記循環流路内で流動中の細胞懸濁液に含まれる細胞数若しくは細胞濃度及び/又は細胞の分散度を経時的に測定する工程を含む細胞分散計測方法。
13.前記測定工程では、散乱光強度又は透過率により測定する、上記12に記載の細胞分散計測方法。
14.前記分散工程では、細胞懸濁液にせん断力を発生させる、上記12又は13に記載の細胞分散計測方法。
15.前記せん断力は、断面積が減少した流路により発生する、上記14に記載の細胞分散計測方法。
まず拡大培養機構における動作を説明する。-80℃にて冷凍保存されたCaco-2(ヒト大腸がん細胞株)4.6×106cellsを、10%FBS(Fetal Bovine Serum)を添加したCaco-2用培養液(Minimum Essential Medium Eagle,Non-Essential Amino Acid Solution、Stabilized Penicillin 100 unit/mL,Streptomycin 100μg/mL、Amphotericin B 0.25μg/mL)9mLに懸濁して細胞供給手段10に入れ、シリンジポンプを稼働させて底面積78.5cm2の拡大培養容器2に全量播種した。2日後、倒立顕微鏡観察の結果80%コンフルエントになったため、細胞剥離作業を行った。具体的には、拡大培養容器2内で以下の通り自動運転した。拡大培養容器2内の培養液をペリスタポンプ7で廃液へ流して除去した後、細胞洗浄溶液供給手段11からPBSを3mL導入し、拡大培養容器2を揺り動かして底面全体に行き渡らせ細胞を洗浄した。PBSをペリスタポンプ7で吸引除去後、細胞剥離溶液供給手段12から0.25%トリプシン-1mM EDTA 2mLを導入し、拡大培養容器2を揺り動かして底面全体に行き渡らせ、37℃にて4分静置し細胞を剥離した。倒立顕微鏡により拡大培養容器2の底面に接着している細胞がないことを確認した後、トリプシンの活性を停止させるために培養液供給手段3から培養液3mLを導入し、剥離した細胞と共に培養液をペリスタポンプ7を稼働させて、試料導入手段4に送液した。
ラテックス粒子を用いて、散乱光強度による計測方法と、一般に広く使用されているセルカウンターを用いる計測方法を比較した。試料は、濃度既知(5.0×105Particles/mL、5mL、溶媒はH2O)のラテックス粒子(ポリサイエンス社製、10μm、Lot No.643763)を用いた。
狭窄部を用いて細胞を分散させる場合、分散条件には、流路内径、狭窄部の内径、狭窄部の数、狭窄部の長さ、流速、及び細胞が狭窄部を通過する回数(流速と稼働時間から算出)等がある。このうち、狭窄部の内径、長さ、流速、及び細胞が狭窄部を通過する回数を自動的に最適化する方法の1例を以下に示す。
2 拡大培養容器
3 培養液供給手段
4 試料導入手段
5 分散手段
6 測定手段
7 ペリスタポンプ
8 3方バルブ
9 細胞播種試料調製手段
10 細胞供給手段
11 細胞洗浄溶液供給手段
12 細胞剥離溶液供給手段
13 細胞剥離溶液阻害剤供給手段
14 廃液
15 拡大培養機構
16 細胞分散計測機構
17 細胞播種機構
18 試料溜め
19 撹拌コイル
20 自動細胞培養装置2
21 自動細胞培養装置3
22 細胞
23 培養担体
24 多方(N方)バルブ
Claims (15)
- 細胞懸濁液を通流させる流路、
前記流路内の細胞懸濁液を送液する液体駆動手段、及び
前記流路内で流動中の細胞懸濁液に含まれる細胞数若しくは細胞濃度及び/又は細胞の分散度を、液体駆動手段を用いて細胞懸濁液を混和させながら、経時的に測定する測定手段
を含む細胞計測器。 - 請求項1に記載の細胞計測器、及び細胞懸濁液に含まれる細胞塊を分散させる分散手段を備える、細胞分散計測機構。
- 前記測定手段が、散乱光強度又は透過率により測定する、請求項2に記載の細胞分散計測機構。
- 前記分散手段が、細胞懸濁液にせん断力を発生させる、請求項3に記載の細胞分散計測機構。
- 前記せん断力は、断面積が減少した流路により発生する、請求項4に記載の細胞分散計測機構。
- 前記細胞計測器により得たデータに基づいて少なくとも液体駆動手段を制御する細胞分散計測機構制御手段をさらに有する請求項5に記載の細胞分散計測機構であって、前記制御手段は、細胞計測器により得たデータに基づいて細胞が所定の分散度に達したか否かを判断し、所定の分散度に達していない場合、細胞懸濁液が前記断面積が減少した流路を通過するよう液体駆動手段を駆動することを特徴とする、上記細胞分散計測機構。
- 断面積が減少した流路が、弾性素材からなる流路を圧迫して流路の狭窄度を任意に設定する流路潰し器により設けられたものであり、前記制御手段は細胞計測器により得たデータに基づいて流路潰し器を制御する、請求項6に記載の細胞分散計測機構。
- 流路に、少なくとも2つ以上の流路が並列に設けられ、かつ切替え弁によりその一部の流路を選択して細胞懸濁液を通すように構成された並列流路を有し、断面積が減少した流路が並列流路に含まれる少なくとも1つの流路に設けられている、請求項6に記載の細胞分散計測機構。
- 2つ以上の断面積が減少した流路が設けられており、各断面積が減少した流路の断面積が異なる、請求項8に記載の細胞分散計測機構。
- 細胞を培養して増殖させ、増殖させた細胞を剥離させる拡大培養機構、
前記拡大培養機構によって剥離された細胞を分散させ測定する請求項2~9のいずれか1項に記載の細胞分散計測機構、及び
前記細胞分散計測機構によって分散させた細胞懸濁液を前記拡大培養機構に送液する細胞播種機構
を有する自動細胞培養装置。 - 細胞の増殖速度を記憶し、細胞懸濁液を前記増殖速度に基づいて定められた所定の濃度に調整する自動細胞培養装置制御部を含む、請求項10に記載の自動細胞培養装置。
- 流路において細胞懸濁液を循環する工程、
前記細胞懸濁液に含まれる細胞塊を分散させる工程、及び
前記循環流路内で流動中の細胞懸濁液に含まれる細胞数若しくは細胞濃度及び/又は細胞の分散度を経時的に測定する工程
を含む細胞分散計測方法。 - 前記測定工程では、散乱光強度又は透過率により測定する、請求項12に記載の細胞分散計測方法。
- 前記分散工程では、細胞懸濁液にせん断力を発生させる、請求項13に記載の細胞分散計測方法。
- 前記せん断力は、断面積が減少した流路により発生する、請求項14に記載の細胞分散計測方法。
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