Backgrond: Granulocyte colony-stimulating factor (G-CSF) widely has been used in treatment of chemotherapy-induced neutropenia. Different lines of evidence indicated that G-CSF is increased in inflammatory situation and has inflammatory characteristics. Unlike G-CSF, type I interferones (IFNs) have been shown to have anti-inflammatory effects and therapeutic effects of them in inflammatory diseases such as hepatitis and multiple sclerosis is known. The aim of this study was to investigate the effects of G-CSF on blood factors and also whether type I IFNs can normalize the probable effects of G-CSF on blood factors.Materials and Methods: 42 mice (male, eight weeks) were divided into six groups of seven, which includes Group 1: (control) injection of distilled water, Group 2: injection 200 mg/kg body weight (b.w.) G-CSF, Group 3: injection 200 mg/kg b.w. interferon-a (IFN-a), Group 4: injection 200 mg/kg b.w. interferon beta (IFN-b), Group 5: injection 200 mg/kg b.w. G-CSF+200 mg/kg b.w. IFN-a, and Group 6: injection 200 mg/kg b.w. G-CSF+200 mg/kg b.w. IFN-b. After 28 days, blood was taken from each mouse heart and blood biochemical parameters (glucose, triglyceride, cholestrol) was investigated.Results: surprisingly, in most cases, the G-CSF and type one IFNs alone or simultaneously reduced the levels of glucose, triglycerides and cholesterol. Also, the reduction of glucose, triglycerides and cholesterol were higher in G-CSF and IFNs in compare with G-CSF alone. Our data raise the possibility that, G-CSF and IFN-α/β have some similarity in signaling pathway which has to be investigated.