Neomycin sulfate (Framycin sulfate) is a broad-spectrum aminoglycoside antibiotic that blocks the synthesis of bacterial proteins in order to exert antimicrobial activity. Neomycin sulfate is commonly used to screen prokaryotic and eukaryotic cells for Neo resistance genes.

METHODS: BHK-21 cells, VERO cells and FEA cells were treated with Neomycin sulfate (1000-20000 μg/mL) for 24 h. Cell viability was measured by MTT.
RESULTS: The viability of BHK-21 cells was significantly reduced by 9000-20000 μg/mL Neomycin treatment. 3000 μg/mL Neomycin treatment significantly reduced the viability of FEA cells. 20000 μg/mL Neomycin treatment did not affect the viability of VERO cells. [1]
METHODS: Mouse cochlear hair cells HEI-OC-1 were treated with Neomycin sulfate (2 mM) for 24 h. Apoptosis was detected by Flow Cytometry.
RESULTS: 20 μM GM1 significantly reduced Neomycin sulfate-induced cell death in HEI-OC-1 cells. [2]

METHODS: To assay in vivo activity, Neomycin sulfate (20 mg/mouse) and bacitracin (20 mg/mouse) were administered by gavage to C57BL/10 mice once daily for seven days.
RESULTS: The combination of Neomycin and bacitracin decreased intestinal permeability and increased gene expression of ZO-1, JAM-A, and occludin in the ileum and ZO-1, claudin-3, and claudin-4 in the colon. [3]
METHODS: To deplete the intestinal microbiota of mice, the antibiotics (ABX) vancomycin (0.5 g/L), ampicillin (1 g/L), Neomycin sulfate (1 g/L), and metronidazole (1 g/L) were administered to mice by drinking water for two weeks.
RESULTS: Antibiotics significantly reduced the diversity and composition of the gut microbiota. [4]