GT1-7

Code: 0095
Cell Line: GT1-7
Species: Mus musculus

Vulgar Name: Mouse
Tissue: Brain
Morphology: Fibroblast
Growth Properties: Adherent
Derivation: The GT1-7 line was immortalized by expression of SV40 T antigen oncogene in hypothalamic GnRH neurons.
Products: GnRH - Gonadotropin-Releasing Hormone.
Biosafey: 2
Additional info: GT1-7 cell line is sensitive to trypsin and low confluence.
Culture Medium: Dulbecco's modified Eagle's medium with 4 mM L-glutamine adjusted to contain 1.5 g/L sodium bicarbonate and 4.5 g/L glucose, 90%; fetal bovine serum, 10%.
Subculturing: Remove and discard culture medium. Briefly rinse the cell layer with PBS without calcium and magnesium to remove all traces of serum that contains trypsin inhibitor. Add 2.0 to 3.0 mL of Trypsin-EDTA solution to flask and observe cells under an inverted microscope until cell layer is dispersed (usually within 5 to 15 minutes). Note: To avoid clumping do not agitate the cells by hitting or shaking the flask while waiting for the cells to detach. Cells that are difficult to detach may be placed at 37°C to facilitate dispersal. Add 6.0 to 8.0 mL of complete growth medium and aspirate cells by gently pipetting. Add appropriate aliquots of the cell suspension to new culture vessels. Incubate cultures at 37°C. Doubling time: 36 hours NOTE: For more information on enzymatic dissociation and subculturing of cell lines consult Chapter 12 in Culture of Animal Cells, a manual of Basic Technique by R. Ian Freshney, 6th edition, published by Alan R. Liss, N.Y., 2010.

Medium Renewal: Every 2 to 3 days

Subcultivation ratio: 1:5 to 1:7
Culture Conditions: Atmosphere: air, 95%; carbon dioxide (CO2), 5% Temperature: 37°C
Cryopreservation: 95% FBS + 5% DMSO (Dimethyl sulfoxide)
Thawing Frozen Cells: SAFETY PRECAUTION: Is highly recommend that protective gloves and clothing always be used and a full face mask always be worn when handling frozen vials. It is important to note that some vials leak when submersed in liquid nitrogen and will slowly fill with liquid nitrogen. Upon thawing, the conversion of the liquid nitrogen back to its gas phase may result in the vessel exploding or blowing off its cap with dangerous force creating flying debris. 1. Thaw the vial by gentle agitation in a 37°C water bath. To reduce the possibility of contamination, keep the Oring and cap out of the water. Thawing should be rapid (approximately 2 minutes). 2. Remove the vial from the water bath as soon as the contents are thawed, and decontaminate by dipping in or spraying with 70% ethanol. All of the operations from this point on should be carried out under strict aseptic conditions. 3. For cells that are sensitive to DMSO is recommended that the cryoprotective agent be removed immediately. Transfer the vial contents to a centrifuge tube containing 9.0 mL complete culture medium and spin at approximately 125 x g for 5 to 7 minutes. 4.Discard the supernatant and Resuspend cell pellet with the recommended complete medium (see the specific batch information for the culture recommended dilution ratio). 5. Incubate the culture in a appropriate atmosphere and temperature (see "Culture Conditions" for this cell line). NOTE: It is important to avoid excessive alkalinity of the medium during recovery of the cells. It is suggested that, prior to the addition of the vial contents, the culture vessel containing the growth medium be placed into the incubator for at least 15 minutes to allow the medium to reach its normal pH (7.0 to 7.6).
References: Nelson SB, LAwson MA, Kelley CG, Mellon PL (2000) "neuron-specific expression of the rat gonadotropin-releasing hormone gene is confered by interactions of a defined promoter with the enhacer in GT1-7 cells". Mol Endocrinol 14 (9): 1509-22. Mellon, P.L., Windle, J,J., Goldsmith, P., Pedula, C., Robets, J. and Weiner, R.I. 1990. Imortalization of hypothalamic GnRH neurons by genetically targeted tumorigenesis. Neuron 5: 1-10. Liposits, Z., Mechenthaler,I., Westel, W.C., Reid, J. J., Mellon, P. L., Weiner, R.I. and Negro-Villar, A.1991. Morphological chaacterization of immortalized hypothalamic neurons synthesizing luteinizing hormone-releasing hormone. Endocrinol. 129: 1575-1583. Wetsel, W.C., Valença, M.M., Merchenthaler, I. Liposits, Z., López, F.J., Weiner, R.I., Mellon, P.L. and Negro-Villar, A. 1992. Intrinsic pulsatile secretory activity of immortalized luteinizing hormone-releasing hormone-secreting neurons. Proc. Natl. Acad. Sci. USA 89:4149-4153. Whyte, D. B., Lawson, M.A., Belsham,D. D., Eraly, S.A. Bond, C.T., Adelman, J. P., and Mellon, P.L. 1995. A Neuron-Specific Enhancer Targets Expression of the Gonadotropin-Releasing Hormone Gene to Hypothalamic Neurosecretory Neurons. Molecular Endocrinology 9, 467-477.
Depositors: JOSE BARRETO CAMPELLO CARVALHEIRA; UNICAMP