Prior to the excitotoxicity assay the cultures were transferred from the growth medium to a non-trophic medium that lacked glycine.
This non-trophic medium contained 10% MEM (Invitrogen) and a glycine-free salt-glucose medium (in mM): NaCl 114, KCl 5.3, MgCl2 1, CaCl2 2, HEPES 10, glucose 30, Na-pyruvate 0.5 with NaHCO3 (0.2%) and phenol red (0.1%).
The prey of Z. jozefienae spiders are granivorous Messor ants that show considerable polymorphism in body size with a continuous variation which provide potential discrete trophic niches (small, medium and large sized sub-castes) for the different developmental stages and both sexes of the spiders.
For example, rat cerebellar granule neurons plated in culture medium without trophic factors, such as brain-derived neurotrophic factor (BDNF), undergo apoptosis but also present up-regulated expression of both mRNA and protein levels of cyclin D1.
To generate a 3D hPSC-based neocortical model, rosettes were embedded in collagen gels, on day 19, with the same medium and trophic factors as shown in Fig. 1A (supplementary material Fig. S2).
The first two parameters define the photosynthetic advantage of the mixotroph, while the third controls the levels of DOC in the medium, reflecting the trophic state of the habitat.
Their medium to high trophic status renders them prone to biomagnification of contaminants (Bragigand et al. 2006).
The effect of the initial plating cell density on the number of spheroids formed was evaluated since cells secrete growth and trophic factors that conditions the medium and, therefore, density may affect their growth.
We hypothesize that preserving hPSC aggregates – allowing embryoid body (EB) formation – and supplementing the medium with defined neocortical trophic factors, will enable the differentiation of hPSCs to structures resembling the human neocortex in vitro.
Support for this hypothesis comes from a recent study showing that although lead was toxic to motor neurons in monoculture, it increased the trophic activity of astrocyte-conditioned culture medium for motor neurons (Barbeito et al. 2005).
We examined whether or not the OE could release soluble trophic factor(s) by testing OE conditioned medium (OECM).
