A Monocytic Barrier to the Humanization of Immunodeficient Mice

Mice with severe immunodeficiencies have become very important tools for studying foreign cells in an in vivo environment. Xenotransplants can be used to model cells from many species, although most often, mice are humanized through the transplantation of human cells or tissues to meet the needs of medical research. The development of immunodeficient mice is reviewed leading up to the current state-of-the-art strains, such as the NOD-scid-gamma (NSG) mouse. NSG mice are excellent hosts for human hematopoietic stem cell transplants or immune reconstitution through transfusion of human peripheral blood mononuclear cells. However, barriers to full hematopoietic engraftment still remain; notably, the survival of human cells in the circulation is brief, which limits overall hematological and immune reconstitution. Reports have indicated a critical role for monocytic cells, monocytes, macrophages, and dendritic cells, in the clearance of xenogeneic cells from circulation. Various aspects of the NOD genetic background that affect monocytic cell growth, maturation, and function that are favorable to human cell transplantation are discussed. Important receptors, such as SIRPα, that form a part of the innate immune system and enable the recognition and phagocytosis of foreign cells by monocytic cells are reviewed. The development of humanized mouse models has taken decades of work in creating more immunodeficient mice, genetic modification of these mice to express human genes, and refinement of transplant techniques to optimize engraftment. Future advances may focus on the monocytic cells of the host to find ways for further engraftment and survival of xenogeneic cells.

Changes in Attitudes towards Organ Donation among Bosnian Immigrants in Sweden from Gender Perspective

OBJECTIVES

The present study aimed to assess changes in the perception of and willingness to participate in organ donation (OD) among immigrants from Bosnia and Herzegovina living in Sweden from the perspective of gender differences.

MATERIALS AND METHODS

A cross-sectional study with 60 participants born in Bosnia and Herzegovina and living in Sweden was performed. Data were collected using a self-administrative questionnaire, providing demographic characteristics, information about opinions, awareness, and knowledge on the donation process and religious approach to the subject, willingness to donate/ receive organs, and possession of a donor card.

RESULTS

Our results showed significant differences between genders regarding the definition of transplantation (P<0.0001), information about OD (P<0.0001), knowledge (P<0.0001) and importance of OD (P<0.003), religious permitting (P=0.0001), and religious opposing (P=0.0007) to OD. Furthermore, a significant difference was observed regarding the preferred recipient (P=0.0062) and the possession of the donor card (P<0.0001). Regression analysis showed that female gender and higher income were statistically significant in prediction of positive attitudes toward OD (P=0.0027, P=0.0002, respectively).

CONCLUSION

Change of social background and integration into Swedish society undoubtedly led to change in the attitudes toward OD, regardless of the perspective of gender differences. However, women were found to have more positive attitudes toward OD.

A Case of Early detected Multidrug-resistant Acinetobacter baumannii Infection after Liver Transplantation

Invasive bacterial infections have become the leading cause of morbidity and mortality among solid organ transplant recipients (SOTRs). Acinetobacter baumannii can cause a serious infection in SOTRs. Multidrug-resistant A. baumannii (MDR-Ab) represents a major problem in liver transplant recipients. Here, we presented a respiratory infection related to MDR-Ab pathogenesis in a patient who underwent liver transplantation due to acute hepatic failure. Accordingly, it has been emphasized that infections after the liver transplantation should be accomplished after due consideration of all relevant facts with a multidisciplinary approach.