METHOD AND DEVICES FOR IMPROVED EFFICIENCY OF RNA DELIVERY TO CELLS

• US 20100298697A1
• Filed: 05/18/2010
• Published: 11/25/2010
• Est. Priority Date: 05/19/2009
• Status: Abandoned Application

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: KRINKE, LOTHAR, SHU, CARL A., WACNIK, PAUL W., THAKKER, DEEPAK Ramesh, BURRIGHT, ERIC NEAL, HEISEL, JENNIFER M.
• Application Number:
  US12/782,274
• Publication Number:
  US 20100298697A1
• Time in Patent Office: Days
• US Class Current: 600/431
• CPC Class Codes: A61M 2025/0042 Microcatheters, cannula or the like having outside diameters around 1 mm or less
• CPC Class Codes: A61M 2210/0693 Brain, cerebrum
• CPC Class Codes: A61N 1/0529 Electrodes for brain stimulation
• CPC Class Codes: A61N 1/0531 Brain cortex electrodes
• CPC Class Codes: A61N 1/0534 Electrodes for deep brain stimulation
• CPC Class Codes: A61N 1/0536 Preventing neurodegenerative response or inflammatory reaction
• CPC Class Codes: A61N 1/0551 Spinal or peripheral nerve electrodes
• CPC Class Codes: A61N 1/327 for enhancing the absorption properties of tissue, e.g. by electroporation
• CPC Class Codes: C12N 15/111 General methods applicable to biologically active non-coding nucleic acids
• CPC Class Codes: C12N 2310/11 Antisense
• CPC Class Codes: C12N 2310/14 interfering N.A.
• CPC Class Codes: C12N 2320/32 Special delivery means, e.g. tissue-specific

Abstract

The instant invention provides a method for improving efficiency of RNA delivery to cells. The method comprises applying a low strength electric field to the cells and then after a certain time period, administering the ribonucleic acid sequence to the cells. Devices, kits, and RNA molecules suitable for delivery and devices suitable for practicing the disclosed methods are also provided.

Claims

1. A method of increasing an uptake of an ribonucleic acid sequence by a cell, said cell being selected from the group consisting of cardiac cells, skeletal muscle cells, kidney cells, neurons and glial cells, the method comprising:

a) applying a plurality of pulses of an electric field to the cell for a time period between about two and about 24 hours;

b) within 24 hours of the step a), administering the ribonucleic acid sequence to the cell

wherein;

the electric field has strength of between about 0.5 V/cm and about 40 V/cm, calculated according to Formula I;

E=V/d

wherein in said formula E is the strength, V is Voltage and d is distance between electrodes.

2. The method of claim 1, wherein the frequency of said pulse is below 400 Hz.

3. The method of claim 1, wherein the duration of each member of the plurality of pulses is between about 100 μ

s and about 500 μ

s.

4. The method of claim 1 wherein the members of the plurality of pulses are uniform.

5. The method of claim 1 wherein the members of the plurality of pulses are not uniform.

6. The method of claim 1, wherein said ribonucleic acid sequence is a siRNA sequence, a shRNA sequence, an aptamer, a spiegelmer, an antimir, or a combination thereof.

7. The method of claim 6, wherein said ribonucleic acid sequence comprises at least one modified nucleotide.

8. The method of claim 6, wherein said ribonucleic acid sequence is a siRNA or a shRNA.

9. The method of claim 1, wherein said siRNA sequence or said shRNA sequence comprises a sense and an antisense strand, each having length between about 19 and about 30 nucleotides.

10. The method of claim 1, wherein

i) said cell is a neuron or a glial cell,

ii) the strength is between about 0.5 V/cm and about 10 V/cm, and

iii) the time period is between about 2 hours and about 22 hours.

11. The method of claim 10, wherein the strength is between about 1 V/cm and about 6 V/cm.

12. The method of claim 1 wherein

i) said cell is a neuron or a glial cell located within a nervous system of a patient,

ii) the patient is undergoing or is a suitable candidate for a deep brain stimulation or a spinal cord stimulation or a transcutaneous electric nerve stimulation, and

iii) the parameters of the electric stimulation are suitable for the deep brain stimulation, the spinal cord stimulation or the transcutaneous electric nerve stimulation.

13. The method of claim 10 further comprising steps of

locating a pre-determined area in a patient, said predetermined area being selected from a brain, a spinal cord, and a peripheral nerve of the patient;

and

placing a plurality of electrodes into said pre-determined area prior to applying the plurality of pulses.

14. The method of claim 13, wherein the placement of the electrodes results in a pre-determined shape of the electric field.

15. The method of claim 10, wherein the nucleic acid is administered to the pre-determined area through a catheter.

16. The method of claim 15, further comprising a step of verifying the placement of the catheter.

17. The method of claim 10, further comprising a step of verification of the placement of the electrodes.

18. The method of claim 1, wherein the cell is a heart cell, and wherein the strength is between about 2 V/cm and about 12 V/cm, and wherein said the members of the plurality of pulses are administered as bursts having frequency of about ten pulses, said bursts separated by about 500 ms, and wherein the time period is about 20 hours.

19. The method of claim 1, further comprising the step of determining a heart rate of a patient, and wherein

i) the cell is a heart cell,

ii) the strength is between about 2 V/cm and about 12 V/cm,

iii) the time period is about 20 hours, and wherein said the members of the plurality of pulses, and

iv) the frequency of said bursts is about identical to the heart rate of the patient.

20. The method of claim 19, wherein an onset of a heart beat initiates the application of the burst of pulses of the electric field.

21. The method of claim 18, wherein the siRNA or the shRNA inhibits expression of phospholamban.

22. The method of claim 1, wherein the cell is a kidney cell, and wherein the strength is between about 0.5 and about 40 V/cm and the time period is between about one and about 12 hours.

23. The method of claim 22, wherein the time period is about two hours.

24. The method of claim 22, wherein the siRNA or the shRNA inhibits expression of BIM.

25. The method of claim 1, wherein the ribonucleic acid sequence is administered in a composition comprising an imaging agent, the method further comprising:

determining a distribution of the composition.

26. The method of claim 18, wherein

i) said plurality of pulses of an electric field are applied to a pre-determined area within a heart or a kidney of a patient through a plurality of electrodes,

ii) said plurality of electrodes are positioned relative to each other as to provide an electric field of a pre-determined shape.

27. The method of claim 1, wherein step (b) is initiated at least 1 minute, at least 5 minutes, at least 30 minutes, at least 45 minutes, at least 1 hour, at least 2 hours, at least 3 hours, at least 4 hours, at least 5 hours, at least 6 hours, at least 7 hours, at least 8 hours, at least 9 hours, at least 10 hours, at least 11 hours, at least 12 hours, at least 13 hours, at least 14 hours, at least 15 hours, at least 16 hours, at least 17 hours, at least 18 hours, at least 19 hours, at least hours, at least 21 hours, at least 22 hours, at least 23 hours or 24 hours after the initiation of step (a).

28. A device for delivering a nucleic acid sequence to a cell within a patient, the device comprising:

a plurality of electrodes;

a catheter, the catheter comprising a wall and a cavity;

a reservoir containing a composition comprising the RNA, said reservoir fluidly connected with said catheter, wherein said composition is RNAse-free;

a pump operably connected to said reservoir;

a processor operably connected to the members of said plurality of electrodes and adapted to receive electrical signals from said members and to deliver an electric field to said members.

29. The device of claim 28, wherein said composition further comprises an imaging agent.

30. The device of claim 28, wherein said nucleic acid sequence comprises or encodes a shRNA or a siRNA, said shRNA or said siRNA comprising an antisense having a length between about 19 and about 30 nucleotides.

31. The device of claim 28, wherein the processor is adapted to actuate the pump after receiving a signal from the members of the plurality of electrodes.

32. The device of claim 28 wherein the members of the plurality of electrodes are positioned to achieve a pre-determined shape of the electric field.

33. The device of claim 32, wherein said pre-determined shape is designed to substantially correspond to a distribution of the composition comprising the nucleic acid sequence in a pre-determined location within a patient.

34. The device of claim 28, wherein the reservoir and the catheter are RNAse-free.

35. The device of claim 28, wherein the composition comprises an RNAse inhibitor.

36. The device of claim 28, wherein the plurality of electrodes are configured to deliver a deep brain stimulation, a spinal cord stimulation or a transcutaneous electric nerve stimulation to the patient.

37. The device of claim 36, wherein the deep brain stimulation has the field strength of about 2 V/cm to about 4 V/cm, the frequency of about 100 Hz to about 185 Hz, and pulse width of between about 90 μ

s and about 180 μ

s.

38. The device of claim 32, wherein

a) the members of the plurality of electrodes sense the rhythmic electric activity of a predetermined organ within the patient'"'"'s body, said pre-determined organ comprising the cell,

b) the onset of said rhythmic electric activity initiates delivery of an electric stimulus to the pre-determined organ, the electric stimulus comprising a plurality of bursts, having an electric field strength between about 2 V/cm and about 12 V/cm, and the frequency about identical to the frequency of said rhythms of electric activity.

39. The device according to claim 28, wherein the members of said plurality of electrodes are disposed within or on the surface of said wall.

40. A medical system comprising:

a plurality of electrodes;

a catheter, the catheter comprising a wall and a cavity, wherein the members of said plurality of electrodes are disposed within or on the surface of said wall;

a reservoir containing a composition comprising the RNA, said reservoir fluidly connected with said catheter;

a pump operably connected to said reservoir;

a processor operably connected to the members of said plurality of electrodes and adapted to receive electrical signals from said members and to deliver an electric field to said members; and

a patient-specific intraoperative image-guided mapping means.

41. A kit comprising:

a) a plurality of electrodes;

b) a composition comprising RNA;

c) a processor adapted to;

i) actuate an electric stimulation by the members of said plurality of electrodes;

ii) receive a signal from the members of said plurality of electrodes and,

iii) within a predetermined time period after receiving said signal from the members of said plurality of electrodes, to actuate release of at least a portion of said composition comprising RNA.

42. The kit of claim 41, wherein said composition containing ribonucleic acid sequence is within a reservoir operably connectable to a pump, and wherein the processor actuates release of at least a portion of said composition comprising ribonucleic acid sequence by sending a signal to the pump.

43. The kit of claim 41, wherein the processor is programmed actuate said electric stimulation of no greater than about 40 V/cm.

44. The kit of claim 41, wherein said predetermined period is between about one hour and about 24 hours.

45. The kit of claim 41, further comprising a means for positioning the members of said plurality of electrodes and said catheter in a desired location, wherein said location is electrically stimulatable by members of said plurality of electrodes.

46. The kit of claim 41, further comprising a catheter fluidly connectable to the reservoir, said catheter having a wall and a distal opening, wherein at least the portion of said composition comprising ribonucleic acid sequence is releasable through said distal opening.

47. The kit of claim 46, wherein the members of said plurality of electrodes are disposed within or on the surface of a wall of the catheter.

48. The kit of claim 46, comprising a means for positioning the members of said plurality of electrodes and said catheter in a pre-determined location, wherein said pre-determined location is electrically stimulatable by members of said plurality of electrodes and wherein at least the portion of composition comprising RNA reaches the pre-determined location after being released from the distal opening.

49. The kit of claim 41, wherein said release of at least a portion of said composition comprising RNA is actuated at least 1 minute, at least 5 minutes, at least 30 minutes, at least 45 minutes, at least 1 hour, at least 2 hours, at least 3 hours, at least 4 hours, at least 5 hours, at least 6 hours, at least 7 hours, at least 8 hours, at least 9 hours, at least 10 hours, at least 11 hours, at least 12 hours, at least 13 hours, at least hours, at least 15 hours, at least 16 hours, at least 17 hours, at least 18 hours, at least 19 hours, at least 20 hours, at least 21 hours, at least 22 hours, at least 23 hours or 24 hours after actuating of the electric stimulation by the members of said plurality of electrodes.