Mesenchymal stem cells are undifferentiated cells able to acquire different phenotypes under specific stimuli. In vitro manipulation of these cells is focused on understanding stem cell behavior, proliferation and plu...Mesenchymal stem cells are undifferentiated cells able to acquire different phenotypes under specific stimuli. In vitro manipulation of these cells is focused on understanding stem cell behavior, proliferation and pluripotency. Latest advances in the field of stem cells concern epigenetics and its role in maintaining self-renewal and differentiation capabilities. Chemical and physical stimuli can modulate cell commitment, acting on gene expression of Oct-4, Sox-2 and Nanog, the main stemness markers, and tissue-lineage specific genes. This activation or repression is related to the activity of chromatin-remodeling factors and epigenetic regulators, new targets of many cell therapies. The aim of this review is to afford a view of the current state of in vitro and in vivo stem cell applications, highlighting the strategies used to influence stem cell commitment for current and future cell therapies. Identifying the molecular mechanisms controlling stem cell fate could open up novel strategies for tissue repairing processes and other clinical applications.展开更多
Malaria has been an important disease throughout the history, particularly in the Mediterranean. The island of Sardinia (Italy) was characterized by severe endemic malaria from antiquity until its eradication in 1950....Malaria has been an important disease throughout the history, particularly in the Mediterranean. The island of Sardinia (Italy) was characterized by severe endemic malaria from antiquity until its eradication in 1950. It provides an exceptional and unique site to examine the history of the disease and its effects on human biology and ecology. Endemic malaria can cause chronic hemolytic anemias that may result in osteological signatures. This paper examines these markers, Porotic Hyperostosis (PH) and Cribra Orbitalia (CO), which are identified from skeletons uncovered in archaeological excavations in Northern Sardinia. Previous hypotheses based on historical references and genetic data suggest that the disease was absent on the island in prehistory and was imported, probably by slaves, during the Carthaginian period (6th to 3rd century BC). This article reports on the paleontological analysis of 283 skeletons excavated from seven archeological sites dating from 4700 BP to 1582 AD. Osteological remains were examined for markers CO and PH as a proxy variable for malaria. The findings support previous hypotheses about history of malaria over time.展开更多
文摘Mesenchymal stem cells are undifferentiated cells able to acquire different phenotypes under specific stimuli. In vitro manipulation of these cells is focused on understanding stem cell behavior, proliferation and pluripotency. Latest advances in the field of stem cells concern epigenetics and its role in maintaining self-renewal and differentiation capabilities. Chemical and physical stimuli can modulate cell commitment, acting on gene expression of Oct-4, Sox-2 and Nanog, the main stemness markers, and tissue-lineage specific genes. This activation or repression is related to the activity of chromatin-remodeling factors and epigenetic regulators, new targets of many cell therapies. The aim of this review is to afford a view of the current state of in vitro and in vivo stem cell applications, highlighting the strategies used to influence stem cell commitment for current and future cell therapies. Identifying the molecular mechanisms controlling stem cell fate could open up novel strategies for tissue repairing processes and other clinical applications.
文摘Malaria has been an important disease throughout the history, particularly in the Mediterranean. The island of Sardinia (Italy) was characterized by severe endemic malaria from antiquity until its eradication in 1950. It provides an exceptional and unique site to examine the history of the disease and its effects on human biology and ecology. Endemic malaria can cause chronic hemolytic anemias that may result in osteological signatures. This paper examines these markers, Porotic Hyperostosis (PH) and Cribra Orbitalia (CO), which are identified from skeletons uncovered in archaeological excavations in Northern Sardinia. Previous hypotheses based on historical references and genetic data suggest that the disease was absent on the island in prehistory and was imported, probably by slaves, during the Carthaginian period (6th to 3rd century BC). This article reports on the paleontological analysis of 283 skeletons excavated from seven archeological sites dating from 4700 BP to 1582 AD. Osteological remains were examined for markers CO and PH as a proxy variable for malaria. The findings support previous hypotheses about history of malaria over time.
