Abstract
Multiple paracrine factors are implicated in the regulation of barrier properties of human brain endothelial cells (BECs) in different physiologic and pathologic settings. We have recently demonstrated that autocrine secretion of basic fibroblast growth factor (bFGF) by BECs is necessary for the establishment of endothelial barrier (as demonstrated by high trans-endothelial electric resistance, TEER), whereas exogenous bFGF inhibits TEER in a concentration-dependent manner. In the present study we analysed the contribution of MAPK/ERK and STAT3 signalling pathways to the inhibitory effects of exogenous bFGF. Treatment with bFGF (8 ng/ml) for 3 days increased phosphorylation of ERK1/2 and STAT3. Treatment with FGF receptor 1 (FGFR1) inhibitor PD173074 (15 μM) suppressed both basal and bFGF-induced activation of ERK1/2 and STAT3. Suppression of STAT signalling with Janus kinase inhibitor JAKi (15 nM) alone or in the presence of bFGF did not change TEER in BEC monolayers. Exposure to JAKi affected neither proliferation, nor expression and distribution of tight junction (TJ) proteins claudin-5, occludin and zonula occludens-1 (ZO-1). In contrast, treatment with MEK 1/2 inhibitor U0126 (10 μM) partially neutralised inhibitory effect of bFGF thus increasing TEER, whereas U0126 alone did not affect resistance of endothelial barrier. Our findings demonstrate that MAPK/ERK signalling pathway does not affect autocrine bFGF signalling-dependent BECs barrier function but is largely responsible for the disruptive effects of the exogenous bFGF. We speculate that bFGF may (depending on concentration and possibly origin) dynamically regulate permeability of the endothelial blood–brain barrier.
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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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This research has received funding from European Regional Development Fund (Project No 13.1.1-LMT-K-718-05-0005) under grant agreement with the Research Council of Lithuania (LMTLT). Funded as European Union’s measure in response to Cov-19 pandemic.
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Author Contributions: Conceptualization, A.P., A.V.; Investigation, K.K., A.P., A.K.; Formal analysis, K.K., A.P., A.K; Art work, K.K., A.P., A.V; Writing – original draft, K.K., A.P., A.V; Writing – review & editing, A.P., A.V.; Supervision, A.P., A.V.; Funding acquisition, A.P., A.V.
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Kriaučiūnaitė, K., Pociūtė, A., Kaušylė, A. et al. Basic Fibroblast Growth Factor Opens and Closes the Endothelial Blood–Brain Barrier in a Concentration-Dependent Manner. Neurochem Res 48, 1211–1221 (2023). https://doi.org/10.1007/s11064-022-03678-x
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DOI: https://doi.org/10.1007/s11064-022-03678-x