Nov 14, 2023

Public workspaceStereotaxic Injections

DOI
dx.doi.org/10.17504/protocols.io.yxmvm3zy5l3p/v1
  • Lindsay Meyerdirk1,
  • Michael Henderson1
  • 1Van Andel Institute
Michael Henderson
Open access
DOI: dx.doi.org/10.17504/protocols.io.yxmvm3zy5l3p/v1
Protocol Citation: Lindsay Meyerdirk, Michael Henderson 2023. Stereotaxic Injections. protocols.io https://dx.doi.org/10.17504/protocols.io.yxmvm3zy5l3p/v1
License: This is an open access protocol distributed under the terms of the Creative Commons Attribution License,  which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Protocol status: Working
We use this protocol and it's working
Created: November 03, 2023
Last Modified: May 31, 2024
Protocol Integer ID: 90660
Keywords: ASAPCRN
Funders Acknowledgement:
Aligning Science Across Parkinson's
Grant ID: ASAP-020616
Abstract
This protocol details stereotaxic injections for any purpose, but in this case is primarily used for the injection of misfolded proteins.
Attachments
nz8tbpqrp.docx
nz8tbpqrp.docx
284KB
Guidelines
*All experiments involving animals must comply with federal and local law. All procedures should be reviewed and approved by the institutional animal care and use committee (IACUC).
Materials
Materials:

  • Brilliant Blue (for practice injection)
  • Surgical tools:
  1. Fine forceps
  2. Needle Holders
  3. Small Scissors
  4. Curved/Flattened Forceps
  5. Scalpel
  • Reagent10 µL, Model 701 RN SyringeHamilton CompanyCatalog #7635-01
  • 34 g needle custom ordered for: 1 in length, Tip 4, with 45 degree bevel (cat #207434)
  • Sterile Cotton Swabs
  • ReagentCOATED VICRYL® (polyglactin 910) SutureEthiconCatalog #J492G
  • VetBond Glue (cat #1469SB)
  • Syringes (0.5 mL and 1.0 mL)
  • Sterile Saline
  • Betadine Solution (7.5-10%)
  • 70% Ethanol

Anesthesia/Analgesia table:
ABCDE
Substance Name Concentration Dose Route Cat #
Isoflurane2%To effect Intranasal Henry Schein 1182097
Ketamine100 mg/mL100mg/kg Intraperitoneal Covetrus 071173
Xylazine100 mg/mL 10mg/kg Intraperitoneal Covetrus 061035
Bupivacaine5 mg/mL4mg/kg Subcutaneous Covetrus 054893
Lidocaine2%4mg/kg Subcutaneous Covetrus 002468
Tylenol Water1 mg/mLTo effect Oral Sigma A7085-100g
Buprenorphine0.3 mg/mL0.1mg/kg Subcutaneous Covetrus 059122
*Ketamine/Xylazine should be mixed in a cocktail and given in 1 dose*

See informative JOVE Video for more information:

https://www.jove.com/science-education/5205/rodent-stereotaxic-surgery
Preparing Mouse
Preparing Mouse
Turn on the heating box so the pad starts warming.
Make sure surgery area is sterilized then set up entire station, leaving all sterilized tools covered until ready to start procedure.
Anaesthetize mouse per IACUC protocol, mouse weight and genetic background.
Once mouse has reached an anesthetic plane, shave the head up to between the eyes. When using isoflurane place the mouse back into the chamber until it no longer responds to a toe pinch.
Place the mouse head in the stereotaxic mount by placing the teeth in the bite bar and sliding the cone over the nose. Once the mouse is not responsive to toe pinch, place the ear bars into the ear canal of the mouse very carefully so as to not crack the bone or puncture the tympanic membrane.
Cover the eyes generously with eye ointment.
Place a sterile drape over the entire mouse, and cut a small hole where the incision will be.

Sterilize the Incision site by swabbing with 70% ethanol followed by Iodine three times.


Inject the 1:1 lidocaine/bupivacaine subcutaneous (SQ) at the injection site. Lift up the sterile drape and inject 250 µL of sterile saline SQ on each side of the mouse (500 µL total), and also inject buprenorphine SQ based on the mouses weight.


Lift a small patch of skin at the base of the skull with forceps and cut rostrally in a vertical line from lambda to between the eyes.


Clean skull with sterile cottons swabs.
Place needle in holder with the bevel facing toward the front. Needle holder should have an alignment of 0.
Head Alignment
Head Alignment
With needle directly over Bregma, write down anterior-posterior (A-P), left-right (L-R), dorsal-ventral (D-V) position.
Go to Lambda. Check the height here and level with Bregma to within 0.1 mm tolerance by raising or lowering the ear bars slowly and evenly.
Go 2 mm to the right of Bregma and record the D-V measure. Go 2 mm to the left of Bregma and record the D-V measure. Level the skull within a tolerance of 0.1 mm.
Move to the injection site. Make a V-shaped mark at the injection site.


Injection
Injection
Move the needle far from the injection site.
Drill a hole with a 28 g burr (slightly bigger than the injection needle).
Move the injection needle back into place. Carefully move the needle to the top of the dura, without puncturing the tissue.
Calculate how far down to go.
Lower needle to the site of injection.
Inject material at 0.4 μL/min.
Wait 3 minutes after the injection has finished
Raise needle out of the brain.
Use an iodine swab to moisten the edge of the incision site and tissue, careful not to get any iodine in the drilled hole. Suture the skin closed with 3-4 stitches. Each stitch has 3 knots. Front-to-back, back-to-front, front-to-back. Follow sutures with a small amount of VetBond to secure the wound together.

Post-operative Care
Post-operative Care
3d
Place the mouse back into a clean cage on a warming pad and watch for the mouse to wake up.
Once awake place a Tylenol water bottle (1 mg/mL) on the cage for the next 3 days.
Monitor the mice once daily for open wounds or adverse side-effects, recording on the surgical card for Duration72:00:00 .

3d
After day 3 remove the water bottle.