ABSTRACT
OBJECTIVE: To examine the potential of intravoxel incoherent motion (IVIM) and blood oxygen level-dependent (BOLD) magnetic resonance imaging for detecting renal changes after iodinated contrast-induced acute kidney injury (CI-AKI) development in a diabetic rabbit model. MATERIALS AND METHODS: Sixty-two rabbits were randomized into 2 groups: diabetic rabbits with the contrast agent (DCA) and healthy rabbits with the contrast agent (NCA). In each group, 6 rabbits underwent IVIM and BOLD imaging at 1 hour, 1 day, 2 days, 3 days, and 4 days after an iohexol injection while 5 rabbits were selected to undergo blood and histological examinations at these specific time points. Iohexol was administrated at a dose of 2.5 g I/kg of body weight. Further, the apparent transverse relaxation rate (R2*), average pure molecular diffusion coefficient (D), pseudo-diffusion coefficient (D*), and perfusion fraction (f) were calculated. RESULTS: The D and f values of the renal cortex (CO) and outer medulla (OM) were significantly decreased compared to baseline values in the 2 groups 1 day after the iohexol injection (p < 0.05). A marked reduction in the D* values for both the CO and OM was also observed after 1 hour in each group (p < 0.05). In the OM, a persistent elevation of the R2* was detected for 4 days in the DCA group (p < 0.05). Histopathological changes were prominent, and the pathological features of CI-AKI aggravated in the DCA group until day 4. The D, f, and R2* values significantly correlated with the histological damage scores, hypoxia-inducible transcription factor-1α expression scores, and serum creatinine levels. CONCLUSION: A combination of IVIM and BOLD imaging may serve as a noninvasive method for detecting and monitoring CI-AKI in the early stages in the diabetic kidney.
Subject(s)
Rabbits , Acute Kidney Injury , Body Weight , Creatinine , Diffusion , Iohexol , Kidney , Magnetic Resonance Imaging , Methods , Oxygen , Perfusion , Relaxation , Vascular Endothelial Growth Factor AABSTRACT
Objective To construct the RNA interference(RNAi)recombinant adenovirus vector targeting at human hypoxia-inducible transcription factor 1?(HIF-1?)and to evaluate its effect on human lung adenocarcinoma cell line SPCA-1.Methods The recombinant adenovirus Ad was constructed.HIF-1? inserted with HIF-1? RNAi fragment via AdEasy system.The virus was purifed by CsCl gradient centrifuge.The functional titer of recombinant adenovirus was measured by transfection test in HEK 293 cells.SPCA-1 cells were transducted with 2 multiplicity of infection(MOI)Ad.HIF1? in vitro,the expression rate of green fluorescence protein(GFP)was recorded by flow cytometry,HIF-1? mRNA and protein level was measured by Real-Time RT-PCR and flow cytometry.ResultsThe recombinant shuttle plasmid PAdTrack.HIF-1? and adenovirus plasmid Ad.HIF-1? were all correct shown by enzyme digestion confirmation.The plasmid pAd.HIF-1? was transducted into HEK293 cells,15%GFP expressionwere seen after 3 days.The final titers of recombinant adenovirus were 5.0?1010 TU/mL.SPCA-1 cells was transducted by Ad.HIF-1? in vitro for 48 h,GFP expression rate was 92%,HIF-1? mRNA and protein level decreased 89% and 87%,respectively.Conclusion RNAi adenovirus vector of human HIF-1? gene has been successfully constructed,which could facilitate the research onHIF-1? gene related gene therapy for lung cancer.