CELL-BASED SENSING SYSTEMS AND METHODS

• US 20120064563A1
• Filed: 08/11/2011
• Published: 03/15/2012
• Est. Priority Date: 08/12/2010
• Status: Abandoned Application

• Current Assignee: California Institute of Technology
• Original Assignee: California Institute of Technology
• Inventors: Tirrell, David A., MAHDAVI, Alborz, WANG, Hua, HAJIMIRI, Seyed Ali
• Application Number:
  US13/208,314
• Publication Number:
  US 20120064563A1
• Time in Patent Office: Days
• US Class Current: 435/29
• CPC Class Codes: G01N 33/5029 on cell motility
• CPC Class Codes: G01N 33/54326 Magnetic particles
• CPC Class Codes: G01N 33/5438 Electrodes

Abstract

The present disclosure describes cell-based sensors. Cell-based sensors can comprise cells coupled with a sensor for sensing change of configuration and/or movement of the cells. Such changes of configuration and/or movement of the cells can be sensed through changes to one or more parameters such as electrical, mechanical and/or optical parameters. By way of example, the sensors can be magnetic based sensors or electrochemical sensors.

Claims

1. A sensing system comprising:

one or more cells that change configuration and/or move as a result of presence of substances, change in environment, or intrinsic physiological change; and

an individual sensing unit or an array of sensing units, each sensing unit comprising at least one sensor, the at least one sensor being coupled with the one or more cells such that the change of configuration and/or movement of the one or more cells changes one or more electrical and/or mechanical parameters of the at least one sensor as a function of the change of configuration and/or movement of the one or more cells.

2. The system of claim 1, wherein the one or more cells are coated with magnetic particles, the magnetic particles configured to move according to the change of configuration and/or movement of the one or more cells, the movement of the magnetic particles configured to change the one or more electrical parameters of the at least one sensor.

3. The system of claim 1, wherein the individual sensing unit or array of sensing units further comprises a reference sensor, such that a sensed output of the at least one sensor is compared with a sensed output of the reference sensor.

4. The system of claim 1, further comprising a reservoir or one or more micro-fluidic structure integrally provided on the at least one sensor such that the reservoir or the one or more micro-fluidic structure is configured to provide a culture medium for the one or more cells and the substances near the at least one sensor.

5. The system of claim 2, wherein the at least one sensor is at least one inductive magnetic sensor.

6. The system of claim 5, wherein the at least one inductive magnetic sensor is an LC resonator comprising capacitors coupled with inductors.

7. The system of claim 1, wherein the change in the one or more electrical parameters is a change in inductance.

8. The system of claim 7, wherein the change in inductance corresponds to a shift in a resonant frequency of the LC resonator.

9. The system of claim 1, wherein, in use, the one or more cells are coupled with the at least one sensor through contact.

10. The system of claim 1, wherein, in use, the one or more cells are coupled with the at least one sensor through one or more layers interposed between the one or more cells and the at least one sensor.

11. The system of claim 10, wherein the one or more layers are selected from the group consisting of:

glass, polymer, sugars, PDMS, parylene C, silicon nitride, and sacrificial materials.

12. The system of claim 1, further comprising a temperature controller for maintaining the one or more cells at a temperature selected from the group consisting of:

a desired temperature, set spatial temperature profile, and temporal temperature sequence.

13. The system of claim 5, wherein the at least one inductive magnetic sensor comprises four inductive magnetic sensors.

14. The system of claim 1, further comprising biological or chemical agents to cause the one or more cells to adhere or move to set locations.

15. The system of claim 1, further comprising mechanical devices to cause the one or more cells to adhere or move to set locations.

16. The system of claim 1, further comprising a detector connectable to a computer for performing analysis.

17. The system of claim 1, further comprising an electronic arrangement, the electronic arrangement comprising:

a plurality of first multiplexers, each of the first multiplexers for multiplexing sensed signals from the at least one sensor and at least a second sensor of the substance sensing units; and

a second multiplexer for multiplexing an output signal from the plurality of the first multiplexers.

18. The system of claim 1, wherein the at least one sensor is made of CMOS.

19. The system of claim 6, wherein the inductors are made of CMOS.

20. The system of claim 4, wherein the reservoir is a microfluidic reservoir comprising at least one chamber to hold test analytes and cells.

21. The system of claim 4, wherein the reservoir is fluidly communicable with microfluidic channels.

22. The system of claim 1, further comprising an optical detector for obtaining an optical image of the one or more cells.

23. The system of claim 1, wherein the system is positioned adjacent to a biological tissue.

24. The system of claim 1, wherein the at least one sensor is at least one electrochemical sensor, the electrochemical sensor comprising a plurality of electrodes.

25. The system of claim 24, wherein the change in the one or more electrical parameters is a change in impedance between at least one sensing/active electrode and at least one reference electrode, whereby the change in the impedance is a function of the change of configuration and/or movement of the one or more cells.

26. The system of claim 25, further comprising a detector to detect the change in the impedance.

27. A sensing method comprising:

providing one or more cells that change configuration and/or move as a result of presence of substances in an analyte, environmental change or intrinsic physiological change, wherein the substances are at or near the one or more cells;

coupling one or more sensors with the one or more cells, the one or more cells changing one or more electrical and/or mechanical parameters of the one or more sensors as a function of the change of configuration and/or movement of the one or more cells;

applying one or more analytes; and

detecting the change of the one or more electrical and/or mechanical parameters of the one or more sensors as a function of the change of configuration and/or movement of the one or more cells, whereby the detected change of the one or more electrical and/or mechanical parameters corresponds to the presence or absence of the substances, environmental changes and/or physiological changes in the one or more analytes.

28. The method of claim 27, further comprising coating the one or more cells with magnetic particles, the magnetic particles moving according to the change of configuration and/or movement of the one or more cells, the movement of the magnetic particles for changing the one or more electrical parameters of the one or more sensors.

29. The method of claim 28, wherein the one or more sensors are one or more inductive magnetic sensors.

30. The method of claim 29, wherein the one or more inductive magnetic sensors are LC resonators comprising capacitors coupled with inductors.

31. The method of claim 30, wherein the change in the one or more electrical parameters is a change in inductance.

32. The method of claim 31, wherein the change in inductance corresponds to a shift in a resonant frequency of the LC resonator.

33. The method of claim 27, wherein variations in temperature of the one or more cells is compensated automatically.

34. The method of claim 27, further comprising adhering or moving the one or more cells to desired positions on the one or more sensors by applying biological or chemical agents to the one or more cells.

35. The method of claim 27, further comprising adhering or moving the one or more cells to desired positions on the one or more sensors by positioning mechanical devices on the one or more sensors.

36. The method of claim 34, further comprising measuring adhesion or movement characteristics of the one or more cells as a consequence of applying the biological or chemical agents, thereby determining presence or absence of the substances in the one or more analytes.

37. The method of claim 27, wherein the coupling is performed by placing the one or more cells on the one or more sensors.

38. The method of claim 27, wherein the coupling is performed by placing the one or more sensors near the one or more cells.

39. The method of claim 27, wherein the coupling is performed through contact between the one or more cells and the one or more sensors.

40. The method of claim 27, wherein the coupling is performed through one or more layers interposed between the one or more cells and the one or more sensors.

41. The method of claim 40, wherein the one or more layers are selected from the group consisting of:

glass, polymer, parylene C, PDMS, sugars, silicon nitride and sacrificial materials.

42. The method of claim 27, wherein the one or more sensors are one or more electrochemical sensors.

43. The method of claim 42, wherein the one or more electrical parameters is a change in impedance between one or more sensing electrodes and one or more reference electrodes of the one or more electrochemical sensors.

44. The method of claim 43, wherein the one or more electrochemical sensors comprise at least one detector to detect the change in the impedance.

45. The method of claim 27, further comprising positioning one or more optical detection systems on or near the one or more cells for detection.