EP2047265A2 - Method for influencing living cells through cell-surface interaction - Google Patents
Method for influencing living cells through cell-surface interactionInfo
- Publication number
- EP2047265A2 EP2047265A2 EP07785684A EP07785684A EP2047265A2 EP 2047265 A2 EP2047265 A2 EP 2047265A2 EP 07785684 A EP07785684 A EP 07785684A EP 07785684 A EP07785684 A EP 07785684A EP 2047265 A2 EP2047265 A2 EP 2047265A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic
- substrate
- magnetic field
- cell
- external magnetic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54313—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals the carrier being characterised by its particulate form
- G01N33/54326—Magnetic particles
Definitions
- the invention relates to a method for influencing living cells by cell-surface interaction according to the preamble of patent claim 1.
- the inventors are aware that immobilization steps have already been undertaken in the application of growth factors by means of simple adsorption on biocompatible surfaces. For adsorption, it is necessary first to dissolve the growth factors in a solvent, to apply this solution to a substrate and then to allow it to dry.
- the object of the invention is therefore to remedy this situation and to influence by targeted adjustment of the surface structure of living cells by Zeil surface interaction and to carry out studies on time-dependent structural changes can.
- the surface structure formed by the carrier material on the carrier substrate is specifically influenced by applying an external magnetic field.
- Magnetic particles with diameters of less than 1 ⁇ m can be used as the magnetic carrier material.
- nanobeads can consist of the magnetic material magnetite, for example, and nanobeads with various reactive surface groups (carboxyl, amino groups, etc.) can be covalently attached to these surface groups as biologically active material, for example growth factors and proteins for a wide variety of cell types become.
- the biologically active material is well bonded to the magnetic carrier material.
- the magnetic carrier material is applied to a magnetic carrier substrate by magnetic interaction.
- the binding of the biologically active material "follows" this of the (electro) magnetic structure of the carrier material and is distributed in the corresponding spatial structure on the magnetic carrier substrate.
- the biologically active material in the case of immobilization such as the growth factors on the one hand no longer in a liquid environment. This may affect functionality. Furthermore, the biologically active material is not very strongly bound to the surface. This can lead to renewed detachment. In addition, the preparation known from the prior art does not permit structuring in the nanometer to micrometer range. On the other hand, by making this possible with the present method, conclusions regarding cell reactions to different structures are obtained.
- stem cells can also be differentiated in the present method.
- magnetic carrier substrates thin films having a specific magnetic domain structure
- This domain structure can be influenced by external magnetic fields in their shape and strength, whereby a high variability of the system is achieved.
- an embodiment of the invention is that the external magnetic field is generated by a spatially variably positionable permanent or electromagnet.
- electrical interconnects are arranged in the magnetic carrier substrate and the external magnetic field is generated or changed by a current flow in the electrical interconnects.
- the electromagnetic structure of the carrier substrate can be changed by applying an electrical current in the conductor tracks. These changes can be followed by the magnetic particles.
- the electrical strip conductors it is possible to generate a magnetic field of specific structure and specific thickness in a simple manner in a very targeted and easily adjustable manner so that an external magnetic field, which is generated by a current flow in the electrical strip conductors, can be superimposed on the magnetic field of the carrier substrate becomes.
- a development of the invention is that the carrier material is locally heated by the external magnetic field is at least in this local area in the kHz to MHz range designed to be variable.
- This local heating can take place, for example, with a local resolution in the range of a few micrometers.
- the temporally rapidly changing magnetic fields can be generated on the one hand by magnets arranged in the surroundings of the carrier substrate or, in the case of an embodiment with electrical conductor tracks, by currents with a corresponding component of the alternating current. By these magnetic fields, a movement of the magnetically bonded particles can be induced, which has energy losses in the form of heat. If this excitation is carried out in a controlled manner at certain locations of the substrate, a local heating of the substrate and of the cells located thereon can be achieved. This heating can be used selectively to specifically modify or cleave the biomolecules coupled to the particles.
- the external magnetic field is changed as a function of time.
- the spatial arrangement of the magnetic carrier material on the magnetic carrier substrate can thus be influenced.
- the external magnetic field may be independent and external to the carrier substrate.
- permanent magnets or electromagnets arranged in the surroundings of the carrier substrate may be considered, which may optionally be repositioned spatially, so that both their field strength and the geometry of the magnetic fields can be varied with respect to the carrier substrate. But it is - as already explained in connection with claim 1 - possible to generate the external external magnetic field by embedded in the carrier substrate electrical conductor tracks.
- the external magnetic field is temporally changeable with frequencies in the MHz to MHz range.
- the geometry of the magnetic fields can be changed and specified flexibly. In general, the magnetic fields should be noted that they should not affect the effectiveness of the biologically active material.
- modular growth factors and specific proteins whose existence is a prerequisite for the controlled influencing of cells, in particular of stem cells, to connect to a surface.
- the arrangement it is possible, in particular, to classify influences which are caused by surface structures or specific arrangements of the growth factors.
- the invention also makes use of the fact that a covalent binding of the biologically active material, such as, for example, the growth factors to the magnetic carrier material (nanobeads), takes place. This is definitely a stronger and thus more stable immobilization of the biomolecules than would be the case with physisorption.
- the invention makes it possible with particular advantage to influence "in vitro" structural properties of the substrates used (space-time profile). Growth factors, relevant biomolecules or proteins can be bound in determinable concentrations in controlled positions at the carrier substrate.
- variable system allows the study of structural influences on cellular mechanisms.
- structures are variable, stable immobilization of biomolecules to the surface can be ensured.
- FIG. 3 shows the carrier substrate from FIG. 2 with a domain distribution set according to the method according to the invention
- Fig. 5 shows an embodiment for setting different magnetic Domain structures
- FIG. 6 shows an exemplary embodiment for temporally changing an already set domain structure.
- FIG. 1 shows a magnetic carrier material 1 with a biologically active material 2 attached thereto.
- the carrier material 1 may consist of so-called nanobeads. These may for example consist of magnetite (Fe 3 O 4 ) 3.
- the nanobead may have an overall diameter of the order of 100 nm to 500 nm.
- the individual magnetite particles 3 have a diameter of the order of magnitude of 20 nm; the nanobead consists in total of approximately 80% magnetite.
- This magnetite may be incorporated in a matrix 4 which occupies the remaining 20% by volume and consists of polysaccharide.
- the surface 5 of the nanobead can be formed by reactive molecules or proteins, which can be, for example, COOH, NH 2 or other molecules or proteins.
- the magnetic carrier material 1 is doped with the biologically active material 2, which is attached by a covalent bond to the molecules or proteins of the surface of the nanobeads.
- FIG. 2 shows a magnetic carrier substrate 6 (in this case YIG, Yttrium Iron Gamet) with a magnetic domain distribution which typically corresponds to the basic or delivery state of the manufacturer.
- the white or black regions represent domains with antiparallel, in each case perpendicular to the substrate plane magnetization.
- FIG. 3 shows the carrier substrate 6 after a temporary application and switching off of an external magnetic field.
- This magnetic field can be generated by means of permanent magnets, which are positioned accordingly or by electric coils, which are flowed through by a controllable current.
- the magnetic or magnetizable carrier substrate 6 may consist of the elements Y, Sm, Bi, Ga, Fe. These garnet films are just an example list. in principle All magnetic surfaces are suitable as carrier material.
- FIG. 4 shows a basic illustration of the magnetization of the carrier substrate 6.
- regions form, which have different orientations of the magnetic fields according to the arrows shown.
- the orientations in the transition regions of the carrier substrate 6 can be seen in particular.
- the carrier substrate 6 After such a carrier substrate 6 has been loaded, it can be brought into contact with the living cells.
- the living cells can be dissolved, for example, in an aqueous solution into which the carrier substrate 6 is immersed.
- the meandering domain distribution shown in FIG. 5 a can be reconfigured by applying a temporally limited external magnetic field.
- FIGS. 5b-5d show, by way of example, domain distributions which can be set by different external magnetic fields in the same substrate as in FIG. 5a.
- a coil can be used which is adjustable in its position angle-dependent to the magnetization of the substrate.
- the coil is oriented in such a way that its magnetic field forms an angle of 88 ° -89 ° with the magnetization of the substrate. Subsequently, the substrate is brought into magnetic saturation by the coil field and after a slow shutdown, the new domain configuration is established.
- the stripe domains of Fig. 5 c are set in an analogous manner. However, this requires an angle of approximately 70 ° between the magnetic field of the coil and the output magnetization of the substrate.
- the mixing state shown in FIG. 5d can be achieved by angle settings between the values mentioned in connection with FIGS. 5b and 5c.
- a coil can be used to alter these configurations in domain width and / or orientation.
- the coil field is aligned in parallel with the magnetization of the substrate.
- the magnetic structure of the carrier substrate can now be varied over time.
- FIG. 6 shows the temporal change of the domain structure over the period of 60 s, during which the magnetic field strength increased linearly from -6.8 mT to 6.8 mT at the substrate. In order to maintain a certain domain width in this case the corresponding magnetic field must be maintained in its strength.
- the magnetic carrier material follows the structural change of the magnetic substrate and preferably deposits in the transition region between the individual domains.
- the magnetic carrier material offers in cell culture a temporally and spatially variable structure by means of which time-dependent cellular processes can be investigated.
Landscapes
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Chemical & Material Sciences (AREA)
- Hematology (AREA)
- Urology & Nephrology (AREA)
- Biotechnology (AREA)
- Biochemistry (AREA)
- Cell Biology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Microbiology (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Immobilizing And Processing Of Enzymes And Microorganisms (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006036380A DE102006036380A1 (en) | 2006-08-02 | 2006-08-02 | Method for influencing living cells by cell-surface interaction |
PCT/DE2007/001377 WO2008014782A2 (en) | 2006-08-02 | 2007-08-02 | Method for influencing living cells through cell-surface interaction |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2047265A2 true EP2047265A2 (en) | 2009-04-15 |
Family
ID=38884926
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07785684A Withdrawn EP2047265A2 (en) | 2006-08-02 | 2007-08-02 | Method for influencing living cells through cell-surface interaction |
Country Status (4)
Country | Link |
---|---|
US (1) | US20090325257A1 (en) |
EP (1) | EP2047265A2 (en) |
DE (1) | DE102006036380A1 (en) |
WO (1) | WO2008014782A2 (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3970518A (en) * | 1975-07-01 | 1976-07-20 | General Electric Company | Magnetic separation of biological particles |
SE454885B (en) * | 1984-10-19 | 1988-06-06 | Exploaterings Ab Tbf | POLYMER COATED PARTICLES WITH IMMOBILIZED METAL ZONES IN ITS SURFACE PROCEDURES FOR PRODUCING THEREOF |
US5776748A (en) * | 1993-10-04 | 1998-07-07 | President And Fellows Of Harvard College | Method of formation of microstamped patterns on plates for adhesion of cells and other biological materials, devices and uses therefor |
US5655546A (en) * | 1995-06-07 | 1997-08-12 | Halpern; Alan A. | Method for cartilage repair |
EP0859229A1 (en) * | 1997-02-10 | 1998-08-19 | Gist-Brocades B.V. | Detection of analytes using electrochemistry |
FR2817266B1 (en) * | 2000-11-29 | 2004-01-16 | Commissariat Energie Atomique | MICRO STATIC NETWORK OF BIOLOGICAL OR CHEMICAL PROBES, IMMOBILIZED ON A MAGNETIC ATTRACTION SUPPORT |
US7285412B2 (en) * | 2001-07-27 | 2007-10-23 | Surface Logix Inc. | Device for magnetic immobilization of cells |
CN101544075B (en) * | 2001-09-03 | 2012-12-05 | 帝人株式会社 | Transparent conductive laminate, and transparent touch panel using the same |
AU2003217743A1 (en) * | 2002-02-28 | 2003-09-16 | Surface Logix, Inc. | Magnetic immobilization of cells |
JP2004037338A (en) * | 2002-07-05 | 2004-02-05 | Yokogawa Electric Corp | Method for immobilizing biological polymers to substrate using magnetic beads, and biological polymer measuring apparatus employing the same |
US20050079591A1 (en) * | 2003-07-08 | 2005-04-14 | Reich Daniel H. | Method and magnetic microarray system for trapping and manipulating cells |
-
2006
- 2006-08-02 DE DE102006036380A patent/DE102006036380A1/en not_active Ceased
-
2007
- 2007-08-02 WO PCT/DE2007/001377 patent/WO2008014782A2/en active Application Filing
- 2007-08-02 EP EP07785684A patent/EP2047265A2/en not_active Withdrawn
- 2007-08-02 US US12/375,874 patent/US20090325257A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2008014782A2 * |
Also Published As
Publication number | Publication date |
---|---|
DE102006036380A1 (en) | 2008-02-07 |
WO2008014782A3 (en) | 2008-04-17 |
US20090325257A1 (en) | 2009-12-31 |
WO2008014782A2 (en) | 2008-02-07 |
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AX | Request for extension of the european patent |
Extension state: AL BA HR MK RS |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HARTMANN, UWE Inventor name: LOICHEN, JULIANE |
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17Q | First examination report despatched |
Effective date: 20090602 |
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DAX | Request for extension of the european patent (deleted) | ||
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18D | Application deemed to be withdrawn |
Effective date: 20121023 |