CAPTURING OF CELL FLUID AND ANALYSIS OF ITS COMPONENTS UNDER OBSERVATION OF CELLS AND INSTRUMENTS FOR THE CELL FLUID CAPTURING AND THE ANALYSIS

• US 20140315237A1
• Filed: 02/28/2014
• Published: 10/23/2014
• Est. Priority Date: 11/02/2007
• Status: Active Grant

• Current Assignee: Humanix Co., Ltd.
• Original Assignee: Humanix Co., Ltd.
• Inventors: Masujima, Tsutomu, Tsuyama, Naohiro, Mizuno, Hajime
• Granted Patent: US 9,502,227 B2
• Time in Patent Office: Days
• US Class Current: 435/29
• CPC Class Codes: G01N 27/62 by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
• CPC Class Codes: G01N 33/48 Biological material, e.g. blood, urine G01N33/02, G01N33/26, G01N33/44, G01N33/46 take precedence; Haemocytometers counting blood corpuscules distributed over a surface by scanning the surface G06M11/02
• CPC Class Codes: H01J 49/04 Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
• CPC Class Codes: H01J 49/167 Capillaries and nozzles specially adapted therefor; electrostatic spraying per se B05B5/00
• CPC Class Codes: Y10T 436/24 Nuclear magnetic resonance, electron spin resonance or other spin effects or mass spectrometry

Abstract

A method captures cellular components from a single cell and performs mass spectrometry on the components. The method includes inserting a nanospray ionization capillary tip into a specific region of the cell under observation with a microscope. The nanospray ionization capillary tip can include a filament in the interior. The method further includes capturing the cellular components of the specific region of the cell into the opening of the nanospray ionization capillary tip and keeping the components at the nanospray ionization capillary tip, supplying an ionization supporting solvent from a back-end of the nanospray ionization capillary tip, applying an electric field between a sample inlet of a mass spectrometer and the nanospray ionization capillary tip, whereby nanospray ionization to the cellular components is implemented, and performing the mass spectrometry on the cellular components captured at the nanospray ionization capillary tip.

Claims

1. A method for capturing cellular components from a single cell and performing mass spectrometry on the components, said method comprising:

inserting a nanospray ionization capillary tip into a specific region of the cell under observation, whose opening diameter is corresponding to the specific region of the cell under observation with a microscope, wherein the nanospray ionization capillary tip comprises a filament in the interior,

capturing the cellular components of the specific region of the cell into the opening of the nanospray ionization capillary tip and keeping the components at the nanospray ionization capillary tip,

supplying an ionization supporting solvent from a back-end of the nanospray ionization capillary tip,

applying an electric field between a sample inlet of a mass spectrometer and the nanospray ionization capillary tip, whereby nanospray ionization to the cellular components is implemented, and

performing the mass spectrometry on the cellular components captured at the nanospray ionization capillary tip.

2. The method in accordance with claim 1, wherein the diameter of the opening of the nanospray ionization capillary tip is from 0.1 to 100 micrometer.

3. The method in accordance with claim 1 wherein at least one of outer or inner surface of the nanospray ionization capillary tip is electro-conductive, or the nanospray ionization capillary tip contains a thin electro-conductive filament extending from rear side of the tip to inner side of the top of the tip.

4. The method in accordance with claim 1, wherein the outer surface of the nanospray ionization capillary tip is hydrophobic while target cells have a cell membrane, and the outer surface of the nanospray ionization capillary tip is hydrophilic while the target cells have both a cell membrane and a cell wall.

5. The method in accordance with claim 1, wherein the inner surface of the nanospray ionization capillary tip is coated or combined with groups with molecular affinity for capturing a specific molecule.

6. The method in accordance with claim 1, wherein the inside of the nanospray ionization capillary tip is pressurized until the tip coming close to the cell under the observation in order to prevent the contamination by peripheral substances including culture medium, and the pressurization is deactivated after the opening of the tip is inserted into the observing cell.

7. The method in accordance with claim 1, wherein the opening of the nanospray ionization capillary tip captures the cellular components for the mass spectrometry by leaking internal components of the cell or an organelle through hole(s) formed thereon.

8. The method in accordance with claim 1, wherein a manipulator, which controls the three dimensional position of the nanospray ionization capillary tip, is placed back end of the nanospray ionization capillary so that the manipulator is set between the cell under observation and the mass spectrometer, said manipulator leads the nanospray ionization capillary tip to the point of the target cell under the observation for mass spectroscopic analysis, and the manipulator leads the nanospray ionization capillary tip to the sample inlet of the mass spectrometer when the captured cell components are subjected to mass spectroscopic analysis.

9. The method in accordance with claim 1, wherein the step of capturing cellular components comprises capturing a plurality of cellular components, at different spatial locations, at different time sequential stages, or before and after each of treatments to the cell when multiple different treatments are performed on the cell, and the step of performing the mass spectrometry comprises performing a plurality of the mass spectrometry to the captured cellular components at the different spatial locations, or at the different time sequential stages or before and after the treatments to obtain the mass spectra and evaluating the difference between each spectrum, so that molecules which relate to the spatial and time difference among the cells observed by the microscope is evaluated and identified.

10. The method in accordance with claim 1, wherein the step of performing mass spectrometry comprises:

storing mass spectra of known samples into computer(s),

obtaining the mass spectrum of the captured cellular components during the nano-spray ionization,

analyzing the cell components by extracting difference between the known and the obtained spectrum so as to obtain a specific peak of mass spectrometry, and

applying a higher order mass spectrometry to molecules, which shows the specific peak of mass spectrometry, selected from the cellular components by mass filtering for identification of the molecules.

24. The method in accordance with claim 1, wherein the filament comprises glass.

11. A system for capturing cellular components from a single cell and performing mass spectrometry on the components said system comprising:

a microscope to observe the dynamic morphological change of cells which are subjected to mass spectroscopic analysis,

nanospray ionization capillary to ionize the cellular components for the mass spectrometry, said nanospray ionization capillary further comprising a tip portion having an opening and a filament in the interior, for capturing the cellular components of a specific region of the cell by inserting the tip to the specific region of the cell, whose size is not bigger than the size of the specific region of the cell, and a back side portion from which ionization supporting solvent is supplied,

a mass spectrometer which has a sample inlet hole to analyze the cellular components after the ionization, and

a high voltage power supply which applies an electric field between the sample inlet and the nanospray ionization capillary,

wherein the nanospray ionization capillary tip is configured to penetrate into the cell under observation of the microscope to capture the cell components from the specific region of the cell, the captured components are ionized by applying the electric field between the nanospray ionization capillary and the inlet hole of the mass spectrometer and wherein the system is configured to introduce the solvent into back side portion of the nanospray ionization capillary.

12. The system in accordance with claim 11, wherein the diameter of the opening of the nanospray ionization capillary tip is from 0.1 to 100 micrometer.

13. The system in accordance with claim 11, wherein at least one of outer or inner surface of the nanospray ionization capillary is electro-conductive, or the high voltage power supply further comprising an electro-conductive fine wire extending from the back side of the nanospray ionization capillary to the tip of the nanospray ionization capillary.

14. The system in accordance with claim 11, wherein the outer surface of the nanospray ionization capillary is hydrophobic while target cells have a cell membrane, and the outer surface of the nanospray ionization capillary is hydrophilic while the target cells have both a cell membrane and a cell wall.

15. The system in accordance with claim 11, wherein the inner surface of the tip of the nanospray ionization capillary tip is coated or combined with groups of molecular affinity for capturing a specific molecule.

16. The system in accordance with claim 11, wherein the inside of the nanospray ionization capillary is pressurized until the tip is coming close to the cell under the observation in order to prevent the contamination by peripheral substances including culture medium, and the pressurization is deactivated after the opening of the tip is inserted into the observing cell.

17. The system in accordance with claim 11, wherein a manipulator, which controls the three dimensional position of the nanospray ionization capillary tip, is disposed back end of the nanospray ionization capillary so that the manipulator is set between the cell under observation and the mass spectrometer, said manipulator leads the nanospray ionization capillary tip to the point of the target cell under the observation for mass spectroscopic analysis, and the manipulator leads the nanospray ionization capillary tip to the sample inlet hole of the mass spectrometer when the captured cell components are subjected to mass spectroscopic analysis.

18. The system in accordance with claim 11, wherein the nanospray ionization capillary tip is configured to capture cellular components at different spatial locations, or at different time sequential stages, or before and after each of treatments to the cell when multiple different treatments are performed, and the mass spectrometer is configured to obtain the mass spectra of the captured cellular components at the different spatial locations, or at the different time sequential stages or before and after the treatments, and to extract the difference between each spectrum, so that molecules which relate to the spatial and time difference among the cells observed by the microscope is evaluated and identified.

19. The system in accordance with claim 11, wherein the mass spectrometer comprises computer(s) configured to store mass spectra of known samples and said mass spectrometer is configured to analyze the cell components by extracting a difference between the mass spectra of the known samples and a spectrum of the captured cellular components so as to obtain a specific peak of mass spectrometry, and to apply a higher order mass spectrometry to molecules, which shows the specific peak of mass spectrometry, selected from the cellular components by mass filtering, for identification of the molecules.

20. A method for capturing cellular components from a single cell and performing mass spectrometry on the components, said method comprising:

inserting a nanospray ionization capillary tip into a specific region of a cell whose opening diameter is not bigger than a size of the specific region of the cell, wherein the a nanospray ionization capillary tip comprises a filament in the interior,

capturing the cellular components in the specific region from the tip of the nanospray ionization capillary,

supplying ionization supporting solvent from a back-end of the nanospray ionization capillary, keeping the components at the tip,

applying an electric field between a sample inlet of a mass spectrometer and the nanospray ionization capillary tip whereby the cellular components are ionized and introduced to the mass spectrometer, and

performing the mass spectrometry to the introduced cellular components.

21. A system for capturing cellular components from a single cell and performing mass spectrometry on the component, said system comprising:

a nanospray ionization capillary to ionize the cellular components for the mass spectrometry, said nanospray ionization capillary further comprising a tip portion having an opening and a filament in the interior, for capturing the cellular components of a specific region of the tissues by inserting the tip into the specific region of the tissues for capturing the cellular components whose size is not bigger than the size of the specific region of a cell, and a back side portion from which ionization supporting solvent is supplied,

a mass spectrometer which has a sample inlet hole to analyze the cellular components after the ionization,

a high voltage power supply which applies an electric field between the sample inlet and the nanospray ionization capillary,

wherein the nanospray ionization capillary tip penetrates into the tissue to capture the cellular components, the captured components are ionized by applying the electric field between the nanospray ionization capillary and the inlet hole of the mass spectrometer, and wherein the system is configured to introduce the solvent into the back side portion of the nanospray ionization.

22. A method for capturing biological fluids or liquids in less than micro meter region and performing mass spectrometry to thereof, said method comprising:

inserting a nanospray ionization capillary tip into a specific region of a cell whose opening diameter is not bigger than a size of the specific region of the cell, wherein the a nanospray ionization capillary tip comprises a filament in the interior,

capturing components in the specific region with the tip of the nanospray ionization capillary and keeping the components at the tip,

supplying an ionization supporting solvent from a back-end of the nanospray ionization capillary,

ionizing the components using nanospray ionization by applying an electric field between a sample inlet of a mass spectrometer and the nanospray ionization capillary tip,

performing mass spectrometry for the introduced cellular components.

23. A system for capturing biological fluids or liquids in less than micro meter region and performing mass spectrometry to thereof, said system comprising:

a nanospray ionization capillary to ionize cellular components for the mass spectrometry, said nanospray ionization capillary further comprising a tip portion having an opening and a filament in the interior, for capturing the cellular components of a specific region of the biological fluids or liquids by inserting the tip into a specific region of a cell whose size is not bigger than the size of the specific region of the cell, and a back side portion from which ionization supporting solvent is supplied,

a mass spectrometer which has a sample inlet hole to analyze the cellular components after the ionization,

a high voltage power supply which applies an electric field between the sample inlet and the nanospray ionization capillary,

wherein the nanospray ionization capillary tip penetrates into the cell to capture the cellular components, the captured components are ionized by applying the electric field between the nanospray ionization capillary and the inlet hole of the mass spectrometer, and wherein the system is configured to introduce the solvent into back side portion of the nanospray ionization capillary.