DESCRIPTION
CULTURE VESSEL AND CULTURE METHOD
Technical Field
5 [0001]
The การประดิษฐ์นี้ relates to culture of cells and harvesting of the cells.
Background Art
[0002]
10 Along with the recent development of cell technology, new culture methods to obtain
cells having a function similar to an in-vivo function by mimicking an in-vivo pericellular
environment or morphology have been developed. An attempt has been made to use cells
cultured by such methods as a simulator for treatment or biological reaction. Various culture methods have been developed, such as a method of culturing cells using a culture support
15 composed of a sponge or fiber; a suspension culture method in which cells are suspended in a
I
1/12/r7
medium so that the cells spontaneously fonn a spheroid; and a method of culturing cells to form a spheroid by performing a cell non-adhesion treatment on a conventional culture chamber (a flask or the like). In particular, a spheroid culture is an excellent method by which interactions
of cells can be maintained, and thus the method is applied to various cells such as pancreatic islet 20 cells, liver cells, stem cells, and cancer cells. In recent years, studies focusing on the size of a
spheroid have been made. For example, in a drug screen test using cancer cells, the diameter or
volume of a spheroid is used as an index (งานเขียนที่ไม่ใช่สิทธิบัตร 1). It is also disclosed that cells
have different functions depending on the size of a spheroid (งานเขียนที่ไม่ใช่สิทธิบัตร 2 and 3). In
addition to the technique of forming a spheroid as mentioned above, a technique of controlling 25 the size of a spheroid has attracted attention. Further, since it is possible to reproduce a specific
function of a cell, it is expected that this technique of controlling the size of a spheroid will be
applicable in various fields, for example, the artificial organ and bioreactor fields. In such
applications, a technique of preparing a large number of spheroids and recovering the spheroids
is important.
30 [0003]
As means for creating a spheroid having a uniform diameter, Patent Literature 1
discloses a method of controlling the size of each spheroid formed by changing the number of cells to be seeded in a 96WP with a U-shaped bottom on which a hydrophilic membrane is
2
foinied. However, the number of spheroids per culture area is small, and thus it is difficult to
prepare a large number of spheroids. As other methods for creating a spheroid having a uniform diameter, Patent Literature 2 to 4 disclose methods of forming a spheroid in a micro-space.
5 Citation List
Patent Literature [0004]
[Patent Literature 1] Japanese Unexamined Patent Application Publication No. H08-131153
[Patent Literature 2] Japanese Unexamined Patent Application Publication No. 2010-88347 10 [Patent Literature 3] International Patent Publication No. WO 2012/036011
[Patent Literature 4] International Patent Publication No. WO 2013/042360
งานเขียนที่ไม่ใช่สิทธิบัตร
[0005]
[งานเขียนที่ไม่ใช่สิทธิบัตร 1] Juergen Friedrichl, et al., "Spheroid-based drug screen: considerations 15 and practical approach", PROTOCOL, February 12, 2009 (Published online) pp. 309-324
[งานเขียนที่ไม่ใช่สิทธิบัตร 2] Franziska Hirschhaeuser, et al., "Multicellular tumor spheroids: An
underestimated tool is catching up again", Journal of Biotechnology 148, 2010, pp. 3-15
[งานเขียนที่ไม่ใช่สิทธิบัตร 3] C'ELINE LIU BAUWENS, et al., "Control of Human Embryonic
Stem Cell Colony and Aggregate Size Heterogeneity Influences Differentiation Trajectories", 20 STEM CELL, 2008, pp. 2300-2310
Summary of Invention
Technical Problem
[0006]
25 However, in the culture method disclosed in Patent Literature 1, the culture efficiency is
extremely low, which is a rate-limiting step for the large-scale culture. In the culture methods disclosed in Patent Literature 2 and 3, the efficiency of formation of spheroids per unit area is high, but there is a possibility that the spheroids will be removed from the inside of the culture
space during replacement of the medium. Accordingly, careful attention is required during
30 replacement of the medium. Moreover, a study has been made on a method of causing a part of
a spheroid to adhere to the inside of a micro-space so as to prevent removal of the spheroid (Patent Literature 4). However, since adhesion property is different in each type of cell, it is necessary to consider a surface treatment method for each of the cells to be used, and thus the method is impractical.
3
[0007]
The การประดิษฐ์นี้ has been made in view of the above-mentioned background. An
object of the การประดิษฐ์นี้ is to design a micro-space structure which facilitates replacement
of a medium and harvesting of cells, and to provide a culture chamber having the said micro-
5 space structure, and a culture method using the said culture chamber, to make it possible to
prepare spheroids with a uniform size with high efficiency, or to prepare a large number of
spheroids with a uniform size with high efficiency.
Solution to Problem
10 [0008]
According to an aspect of the การประดิษฐ์นี้, a culture chamber according to one embodiment includes a plurality of recesses each formed of a bottom portion and an opening portion. The bottom portion has one of a hemispherical shape and a truncated cone shape. The
opening portion is defined by a wall that surrounds an area from a boundary between the opening 15 portion and the bottom portion to an end of each of the recesses, the wall having a taper angle in
a range from 1 degree to 20 degrees. In addition, an equivalent diameter of the boundary is in a
range from 50 pm to 2 mm and a depth from a bottom of the bottom portion to the end of each of
the recesses is in a range from 0.6 or more times to 3 or less times the equivalent diameter. The
wall defining the opening portion forms a surface continuous to the bottom portion, and an
20 inclination of the continuous surface changes at the boundary.
[0009]
In the culture chamber according to one embodiment, it is preferable that the end of
each of the recesses have one of a hemispherical shape, a trapezoidal shape, and an inverted
triangular shape. It is also preferable that an area between two adjacent recesses be flat and a 25 distance between the two recesses be in a range from 5µm to 50 ',mi.
Further, in the culture chamber according to one embodiment, it is preferable that the
culture chamber be a resin molding formed of one or a combination of two or more selected from
the group consisting of acrylic resin, โพลีแลคติก acid, โพลีไกลโคลิก acid, styrene resin, acrylic
styrene copolymer resin, polycarbonate resin, polyester resin, polyvinyl alcohol resin, ethylene 30 vinyl alcohol copolymer resin, thermoplastic elastomer, vinyl chloride resin, and silicon resin. It
is preferable that a functional group be formed on the recesses by a surface modification
treatment method of any one of plasma treatment, glass coating, corona discharge, and UV
ozonation, or a combination thereof and the treatment be performed so that a water contact angle
becomes 45 degrees or less.
DESCRIPTIONCULTURE VESSEL AND CULTURE METHODTechnical Field5 [0001]The การประดิษฐ์นี้ relates to culture of cells and harvesting of the cells.Background Art[0002]10 Along with the recent development of cell technology, new culture methods to obtaincells having a function similar to an in-vivo function by mimicking an in-vivo pericellular environment or morphology have been developed. An attempt has been made to use cellscultured by such methods as a simulator for treatment or biological reaction. Various culture methods have been developed, such as a method of culturing cells using a culture support15 composed of a sponge or fiber; a suspension culture method in which cells are suspended in a I1/12/r7 medium so that the cells spontaneously fonn a spheroid; and a method of culturing cells to form a spheroid by performing a cell non-adhesion treatment on a conventional culture chamber (a flask or the like). In particular, a spheroid culture is an excellent method by which interactionsof cells can be maintained, and thus the method is applied to various cells such as pancreatic islet 20 cells, liver cells, stem cells, and cancer cells. In recent years, studies focusing on the size of a spheroid have been made. For example, in a drug screen test using cancer cells, the diameter or volume of a spheroid is used as an index (งานเขียนที่ไม่ใช่สิทธิบัตร 1). It is also disclosed that cells have different functions depending on the size of a spheroid (งานเขียนที่ไม่ใช่สิทธิบัตร 2 and 3). In addition to the technique of forming a spheroid as mentioned above, a technique of controlling 25 the size of a spheroid has attracted attention. Further, since it is possible to reproduce a specific function of a cell, it is expected that this technique of controlling the size of a spheroid will be applicable in various fields, for example, the artificial organ and bioreactor fields. In such applications, a technique of preparing a large number of spheroids and recovering the spheroids is important.30 [0003]As means for creating a spheroid having a uniform diameter, Patent Literature 1discloses a method of controlling the size of each spheroid formed by changing the number of cells to be seeded in a 96WP with a U-shaped bottom on which a hydrophilic membrane is 2foinied. However, the number of spheroids per culture area is small, and thus it is difficult toprepare a large number of spheroids. As other methods for creating a spheroid having a uniform diameter, Patent Literature 2 to 4 disclose methods of forming a spheroid in a micro-space.5 Citation ListPatent Literature [0004][Patent Literature 1] Japanese Unexamined Patent Application Publication No. H08-131153 [Patent Literature 2] Japanese Unexamined Patent Application Publication No. 2010-88347 10 [Patent Literature 3] International Patent Publication No. WO 2012/036011 [Patent Literature 4] International Patent Publication No. WO 2013/042360 งานเขียนที่ไม่ใช่สิทธิบัตร[0005][งานเขียนที่ไม่ใช่สิทธิบัตร 1] Juergen Friedrichl, et al., "Spheroid-based drug screen: considerations 15 and practical approach", PROTOCOL, February 12, 2009 (Published online) pp. 309-324 [งานเขียนที่ไม่ใช่สิทธิบัตร 2] Franziska Hirschhaeuser, et al., "Multicellular tumor spheroids: An underestimated tool is catching up again", Journal of Biotechnology 148, 2010, pp. 3-15 [งานเขียนที่ไม่ใช่สิทธิบัตร 3] C'ELINE LIU BAUWENS, et al., "Control of Human Embryonic Stem Cell Colony and Aggregate Size Heterogeneity Influences Differentiation Trajectories", 20 STEM CELL, 2008, pp. 2300-2310Summary of InventionTechnical Problem[0006]25 However, in the culture method disclosed in Patent Literature 1, the culture efficiency isextremely low, which is a rate-limiting step for the large-scale culture. In the culture methods disclosed in Patent Literature 2 and 3, the efficiency of formation of spheroids per unit area is high, but there is a possibility that the spheroids will be removed from the inside of the culturespace during replacement of the medium. Accordingly, careful attention is required during30 replacement of the medium. Moreover, a study has been made on a method of causing a part of
a spheroid to adhere to the inside of a micro-space so as to prevent removal of the spheroid (Patent Literature 4). However, since adhesion property is different in each type of cell, it is necessary to consider a surface treatment method for each of the cells to be used, and thus the method is impractical.
3
[0007]
The การประดิษฐ์นี้ has been made in view of the above-mentioned background. An
object of the การประดิษฐ์นี้ is to design a micro-space structure which facilitates replacement
of a medium and harvesting of cells, and to provide a culture chamber having the said micro-
5 space structure, and a culture method using the said culture chamber, to make it possible to
prepare spheroids with a uniform size with high efficiency, or to prepare a large number of
spheroids with a uniform size with high efficiency.
Solution to Problem
10 [0008]
According to an aspect of the การประดิษฐ์นี้, a culture chamber according to one embodiment includes a plurality of recesses each formed of a bottom portion and an opening portion. The bottom portion has one of a hemispherical shape and a truncated cone shape. The
opening portion is defined by a wall that surrounds an area from a boundary between the opening 15 portion and the bottom portion to an end of each of the recesses, the wall having a taper angle in
a range from 1 degree to 20 degrees. In addition, an equivalent diameter of the boundary is in a
range from 50 pm to 2 mm and a depth from a bottom of the bottom portion to the end of each of
the recesses is in a range from 0.6 or more times to 3 or less times the equivalent diameter. The
wall defining the opening portion forms a surface continuous to the bottom portion, and an
20 inclination of the continuous surface changes at the boundary.
[0009]
In the culture chamber according to one embodiment, it is preferable that the end of
each of the recesses have one of a hemispherical shape, a trapezoidal shape, and an inverted
triangular shape. It is also preferable that an area between two adjacent recesses be flat and a 25 distance between the two recesses be in a range from 5µm to 50 ',mi.
Further, in the culture chamber according to one embodiment, it is preferable that the
culture chamber be a resin molding formed of one or a combination of two or more selected from
the group consisting of acrylic resin, โพลีแลคติก acid, โพลีไกลโคลิก acid, styrene resin, acrylic
styrene copolymer resin, polycarbonate resin, polyester resin, polyvinyl alcohol resin, ethylene 30 vinyl alcohol copolymer resin, thermoplastic elastomer, vinyl chloride resin, and silicon resin. It
is preferable that a functional group be formed on the recesses by a surface modification
treatment method of any one of plasma treatment, glass coating, corona discharge, and UV
ozonation, or a combination thereof and the treatment be performed so that a water contact angle
becomes 45 degrees or less.
การแปล กรุณารอสักครู่..