However, this is not to say that even very clear cut relationships between antigens and processing enzymes discovered in vitro, such as that between TTCF and AEP, signal an obligatory protease requirement in vivo, i.e. in immunised mice.
However, different bacterial species seem to have different capacities for persistence in vitro and in vivo such that bacterial infections have varying degrees of difficulty to treat or cure (Table 2).
Fifth, we optimized and established an in vitro differentiation procedure allowing efficient in vitro neurogenesis such that the majority of the differentiated cells become neurons (>80% of total cells) and midbrain-like dopamine neurons can be produced from these rat iPS cells with high efficiency (approximately 10% of total neurons).
The results showed that HA scaffolds fabricated by SFF had no adverse effects in vitro, such as cytotoxicity and hemolysis, or in vivo, such as irritation and sensitization.
For an IVIVC, it is critical to select the appropriate in vitro conditions such that the in vivo environment is mimicked as closely as possible without any change in the release mechanism(s).
Efforts to improve in vitro models such that they more closely mimic the in vivo conditions, such as exposure mechanism and dose, and potential for transport of NMs across cells are being developed rapidly, driven partially by the strong push within the EU to reduce animal testing.
The lack of F-actin binding in the ELISA may be due to missing cofactors, wrong pH or other unfavorable in vitro conditions such that the actin filaments are disrupted under conditions where HAMLET binds to α-actinin.
Alternatively, the ability of cells to exclude Hoechst dye may be increased by in vitro culture such that the SP fraction can no longer be distinguished.
Hence there is a need to accurately quantify particle and/or chemical deposition in our in vitro systems, such that comparisons of biological endpoints between different systems can be achieved with improved precision and accuracy both within and ultimately between laboratories.
We found that the Per2−/− phenotype is enhanced in vitro compared to in vivo, such that the period of Per1-luc expression in Per2−/− SCN explants is 1.5 hours shorter than in Per2+/+ SCN, while the free-running period of wheel-running activity is only 11 minutes shorter in Per2−/− compared to Per2+/+ mice.
