Conclusion: These results strongly support the notion that Ga-68-DO3A-exendin-4 uptake in the pancreas is mediated by specific receptor binding. In addition, pancreatic uptake was decreased by selective destruction of beta-cells. This result suggests that GLP-1R can be quantified in vivo, which has major implications for the prospect of imaging of native beta-cells.”
“The senescence-accelerated GSK1838705A mouse mouse (SAM)
is a murine model of aging that was developed from the AKR/J strain. We examined whether there are behavioral differences among SAM prone 6 (SAMP6; an established model of senile osteoporosis), SAM resistant 1 (SAMR1), and AKR/J, using a modified SmithKline/Harwell/Imperial College/Royal Hospital/Phenotype Assessment (SHIRPA) procedure and pharmacological tests. The modified click here SHIRPA, which is suitable for rapid and comprehensive phenotyping of transgenic and gene-targeted
mice, revealed increased rearing, spontaneous activity, locomotor activity, tail elevation, head bobbing, and tail rattling behaviors of SAMP6 compared with SAMR1 and AKR/J. These phenotypes are consistent with alteration of the dopamine system in SAMP6. Adopting a pharmacological approach to examine dopamine signaling, we evaluated the locomotor activity of the mice after intraperitoneal administration of apomorphine, a subtype non-selective dopamine receptor agonist. Apomorphine at 1 mg/kg significantly increased the EGFR inhibitor locomotor activity of SAMP6, but not SAMR1 or AKR/J. At 3 mg/kg, apomorphine significantly increased the locomotor activities of all three strains, but the increase in SAMP6 was still significantly greater than that in SAMR7 or AKR/J. These results indicate increased sensitivity of the dopamine receptor signaling pathway in SAMP6. Thus, alteration of dopamine receptor signal transduction appears to be one of the underlying mechanisms of the increased locomotor activity of SAMP6. The combination of modified SHIRPA and examination of drug threshold dose differences between strains appears to be an effective
approach to extend the applicability of existing mouse models. (c) 2009 Elsevier Ireland Ltd. All rights reserved.”
“Although the growth of bacteria has been studied for more than a century, it is only in recent decades that surface-associated growth has received attention. In addition to the well-characterized biofilm and swarming lifestyles, bacteria can also develop as micro-colonies supported by structured environments in both food products and the GI tract. This immobilized mode of growth has not been widely studied. To develop our understanding of the effects of immobilization upon a food-borne bacterial pathogen, we used the IFR Gel Cassette model. The transcriptional programme and metabolomic profile of Salmonella enterica serovar Typhimurium ST4/74 were compared during planktonic and immobilized growth, and a number of immobilization-specific characteristics were identified. Immobilized S.