Biochemical evidence for the involvement of central serotonergic neurotransmission in the action of the antidepressant drug Medifoxamine

Medifoxamine, an antidepressant agent which has an original chemical structure, has been shown through in vitro studies, utilising radioligand binding in tissue homogenates, to bind with moderately high affinity to 5-HT_1c and 5-HT₂ receptor subtypes and to 5-HT uptake sites (IC₅₀ 950, 980, and 1,500 nM, respectively). It has been shown to bind in vivo to rat brain 5-HT₂ receptors after acute treatment with high dose (50 mg/kg, i.e., 133.9 μmol/kg). After 14 days continuous treatment with low dose (20 mg/kg, 53.6 μmol/kg), a decrease in the capacity of [³H]-5-HT uptake and a dose-dependent down-regulation of 5-HT₂ receptors in rat cerebral cortex were observed. These results indicate that medifoxamine, which has been shown previously to act through dopaminergic systems, interacts also with central serotonergic neurotransmission and particularly with the 5-HT₂ receptors, which could contribute to its antidepressant effect.     

Implementation of a Patient Charting System: Challenges Encountered and Tactics Adopted in a Burn Center

The rapid movement of information technologies into health care organizations has raised managerial concern regarding the capability of today's institutions to satisfactorily manage their introduction. Indeed, several health care institutions have consumed huge amounts of money and frustrated countless people in wasted information systems implementation efforts. Unfortunately, there are no easy answers as to why so many health informatics projects are not more successful. In this light, the aim of this study is to provide a deeper understanding of how clinical information systems are being implemented by emphasizing research efforts on the dynamic nature of the process, that is, the “how” and “why” of what happened. Using a case study methodology, we examined the implementation of a patient charting system in the Burn Center of a large, not-for-profit, teaching hospital. Based on an in-depth examination of this implementation, several insights are offered to those who have responsibility for managing complex and risky clinical information system implementation projects.     

Two preadipocyte subtypes cloned from human omental fat

To determine whether the characteristics of preadipocytes derived from human fat are uniform or variable, we developed methods for culturing and differentiating cloned human preadipocytes. Individual human omental preadipocytes were cultured for six weeks. The number of cells varied considerably among clones derived from the same subject, implying that human preadipocytes vary in replicative capacity. Indeed, two cell subtypes were found in human omental fat; one type replicated slowly and the other was capable of extensive replication. Cells of both subtypes were capable of differentiation into adipocytes, confirming that both subtypes were preadipocytes. When rat perirenal and epididymal preadipocytes were cloned, a slowly replicating and an extensively replicating preadipocyte subtype were also found. It is proposed that preadipocytes of the rapidly and the slowly replicating subtypes may be at different stages along the pathway between uncommitted precursor cells and differentiated adipocytes.