Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer

The overall goal of the following experiment is to manipulate two murine inducible mase knocking alleles in vivo and in vitro for studies of tissue degeneration and regeneration and cancer studies. This is achieved by implanting hydroxy tamoxifen tablets into animals to reactivate mase in vivo. As a second step, neural stem cells are isolated from animals which are then treated with hydroxy tamoxifen to reactivate mase in vitro.

Next telomere fluorescence in C two hybridization or fish is performed on both cultured cells and formal and fixed paraffin embedded brain tissues in order to check the activity of mase. The results showed that hydroxy tamoxifen treatments can robustly reactivate mase activity, which can both alleviate aging phenotypes and promote tumor formation based on histopathological examination. This method can help answer key questions in the aging and cancer fields, such as whether or not we can slow down the aging process by modulating TH trauma activity, or how to specifically target Thomas to treat cancer.

Demonstrating this procedure will be instructor Dr.Takashi Shingu and a technician April Un from my laboratory. Begin this procedure with the generation of the Turt ER and lock stop locks turt alleles as described in the text protocol, sterilize all the surgical tools before the injection proceed to anesthetize the mice as described in the text protocol. After deep anesthesia is reached, remove the anesthetized animal from the induction chamber and keep their head inside the tube connected to the iso fluorine chamber.

Pinch the foot pads of the mice to ensure the animal is deeply anesthetized. Also put ointment on both eyes In order to prevent the eyes from drawing out, wipe the back of the mice with povidone iodine solution. Next, inject a slow releasing hydroxy tamoxifen pellet with a precision trocar under the skin of the back.

And push the pellet all the way to the midline between two shoulders. Seal the incision with a wound clip applier and monitor the mice for recovery. For anesthesia.

Take out the one day mouse brains and keep the four brains by removing the olfactory bulbs and the cerebellum. Keep the four brain tissues in one milliliter of cold culture medium, and store at four degrees Celsius. Make sure to process the neural tissue within one hour.

Determine the weight of tissue to make sure the 400 milligram limit per digestion is not exceeded. Place the brain on the lid of a 35 millimeter diameter Petri dish and crush the brain using a scalpel. Using a one milliliter pipette tip, add one milliliter of Hank's balance salt solution or HBSS.

Then pipette the pieces back into a 15 milliliter tube after rinsing with HBSS centrifuge at 300 times G for two minutes at room temperature. After carefully removing the supernatant, add 1, 950 microliters of preheated enzyme. Mix one per up to 400 milligrams of tissue.

Incubate the sample in the 15 milliliter tube for 15 minutes at 37 degrees Celsius. Mix the sample by inverting or shaking the tube every five minutes. Then prepare 30 microliters of enzyme Mix two per tissue sample by adding 20 microliters of solution, three to 10 microliters of solution four.

Then add to the sample inverting gently to mix dissociate the tissue mechanically using a wide tipped fire polished paste pipette by pipetting up and down 10 times slowly avoiding the formation of air bubbles. Incubate at 37 degrees Celsius for 10 minutes, inverting the tube every three minutes. Next, apply the cell suspension to a 70 micron cell strainer placed on a 50 milliliter tube.

Apply 10 milliliters of phosphate buffered saline or PBS through the cell strainer. Then discard the cell strainer and centrifuge the cell suspension at 300 times G for 20 minutes. Set room temperature following centrifugation completely aspirate the supernatant.

Resuspend the cells with stem cell medium to the required volume for further applications to activate tele array in locks, stop locks. Turt neural stem cells. Treat the cells with 100 micromolar hydroxy tamoxifen for two days to activate emase and turt er neural stem cells.

Keep the cells in culture medium with 100 micromolar hydroxy tamoxifen to perform telomere fish. First, prepare the metaphase chromosomes from cultured cells for formalin fixed and paraffin embedded or FFPE tissue sections. De parize the sample in xylene and rehydrate in an ethanol series for five minutes each and in PBS for five minutes.

Then postfix the sections in a three to one ratio of methanol to acetic acid for one to two hours. Dehydrate the sections in a cold ethanol series for five minutes each and air dry wash in one XPBS at 37 degrees Celsius for five minutes. Next in nature, the chromosomes in 4%formaldehyde at 37 degrees Celsius for two minutes.

Dehydrate the sections in a cold ethanol series as before and air dry once dry, apply 12 to 25 microliters of the peptide nucleic acid hybridization mixture to each slide. Seal the cover slip with rubber cement posting nature chromosomal preps and tissue sections at 80 degrees Celsius for four minutes. Then hybridize at room temperature or 37 degrees Celsius for two to four hours in a humid chamber.

Next, wash the samples at room temperature with washing buffer for 15 minutes twice. Then wash them at room temperature for five minutes with PBS and tween 23 times. Finally, counterstain the slides with DPI or far red fluorescence for microscopic examination.

When telomere was transiently reactivated in telomere dysfunctional mice, the degenerative phenotypes could be ameliorated in multiple organs such as the brain and testes to determine the impact of telomere reactivation on cells. Cultured in vitro neural stem cells were isolated from late generation G four lock stop locks, TURT and G four turt ER mice. When telomere was reactivated in telomere dysfunctional neural stem cells, the self renewal capability was greatly increased.

In vitro neurogenesis was also significantly enhanced to determine the impact of mase reactivation on tumorgenesis in the context of telomere dysfunction, mase reactivation by tamoxifen treatment was performed in a prostate tumor model. Endot thic T-cell lymphoma model. The treatment resulted in greatly enhanced tumorgenesis in both models.

Lastly, telomere fish was performed on FFPE, mouse brainin tissues and metaphase chromosomes. In these images, red indicates DNA green indicates telomere staining, and cyan indicates centromere staining. After watching this video, you should have a good understanding of how to activate trauma activity in mTOR ER and lock stop locks, mTOR animals and cell lines, and how to use them to study your questions in cancer and agent.