Species: Mouse

Cell type: Mammary carcinoma

Transgenes: Near-infrared fluorescent protein (iRFP; excitation/emission: 690/713nm) with puromycin resistance (Puro) for selection with puromycin

Media: RPMI, 10% FBS, 1% Pen/Strep, 2 μg/mL puromycin

Description: 4T1-iRFP-Puro is a polyclonal population of the murine mammary carcinoma cell line 4T1 (ATCC® CRL-2539™) transduced with a lentiviral vector LV-iRFP-P2A-Puro (LV032) encoding the near-infrared fluorescent protein (iRFP) cDNA under the spleen focus-forming virus (SFFV) promoter linked to the puromycin resistance gene (Puro) via a P2A cleavage peptide

The lentiviral vectors used are self-inactivating (SIN) vectors in which the viral enhancer and promoter has been deleted. Transcription inactivation of the LTR in the SIN provirus increases biosafety by preventing mobilization by replication competent viruses and enables regulated expression of the genes from the internal promoters without cis-acting effects of the LTR (Miyoshi et al., J Virol. 1998).

Mycoplasma Testing: The 4T1-iRFP-Puro cell line has been tested for mycoplasma contamination and is certified mycoplasma free.

Cell Line Authentication: The parental 4T1 cell line was authenticated and certified free of interspecies cross-contamination by short tandem repeat (STR) profiling with 27 STR loci.

Recommended uses:

In vitro: This is a high iRFP expressing cell line suitable for use as a positive control cell line in fluorescence assays to verify iRFP expression in your lentiviral transduced cells.

In vivo: 4T1 cells form tumors post implantation into immunocompromised or syngenic Balb/c mice. The in vivo growth of these tumors can be monitored using noninvasive optical imaging.

Morphology: Low- and high-density cell morphology (200x)

Flow Cytometry for iRFP: 4T1-iRFP-Puro (red) or control (4T1-Fluc-Neo; grey) cells were fixed with paraformaldehyde and analyzed by flow cytometry (20,000 events).