Tir has been shown to downregulate Map-induced filopodia formation (Kenny et al., 2002), modulate EspF's ability to efface microvilli (P. Dean et al., unpublished), is implicated in NleA-mediated disruption of barrier function (as described) and is shown to suppress EspG/G2's ability to activate calpain.
In contrast, no correlation of CSF CXCL13 with blood-CSF barrier function as measured by Qalb was detectable (p = 0.25).
ZO-1 and occludin are considered as two important tight junction proteins of the RPE cell layer and their expression was used to correlate whether the breakdown of ARPE-19 monolayer barrier function as found in this study was associated with an abnormal distribution of both proteins.
Compromise of epithelial barrier function, as observed in this study, is often associated with alterations of tight junction proteins.
Initially, we were interested in determining whether the proinflammatory treatment regiment was altering MDCK barrier function as a cytotoxic effect.
Moreover, the intestinal barrier function, as characterised by the coinciding TEER measurements, was detrimentally affected by the loss of claudin-3.
An association of parasite-induced apoptosis with disruption of epithelial barrier function, as observed in Giardia and Entamoeba infections, is not known in human intestinal epithelium.
Next to this physical barrier, chemical substances take part in the barrier function as well.
This conclusion is further supported by the observation that although increased cell shedding was observed in response to 5-HT beginning 4 hours, the barrier functions as measured by transepithelial electrical resistance (TEER), is not substantially compromised until 48 hours (Figure 4).
The longer CH domain-containing alternate spliced form of zebrafish βPIX is essential for the integrity of the blood-brain barrier [7], as is the function of PAK2a [6].
Functional studies will also be needed to determine whether blood brain barrier function is disrupted as well.
