Y by enhanced apoptosis in a Rho/Rhoassociated kinase (ROCK)dependent mechanism. Additionally, LPA inhibited the neuronal differentiation of iPSCs. Lastly, LPA induced neurite retraction of NS/ PCderived early neurons via Rho/ROCK, which was accompanied by myosin light chain (MLC) phosphorylation. Our data demonstrate the consistency of LPA effects across many sources of human NS/PCs, rendering hESCs and iPSCs valuable models for studying lysophospholipid signaling in human neural cells. Our data also highlight the importance of your Rho/ROCK pathway in human NS/ PCs. As LPA levels are increased within the central nervous method (CNS) following injury, LPAmediated effects on NS/ PCs and early neurons could contribute to the poor neurogenesis observed in the CNS following injury.Frisca, F., D. E. Crombie, M. Dottori, Y. Goldshmit, and a. P ay. Rho/ROCK pathway is essential to the expansion, differentiation, and morphological rearrangements of human neural stem/progenitor cells induced by lysophosphatidic acid. J. Lipid Res. 2013. 54: 1192206.Supplementary key words human embryonic stem cell induced pluripotent stem cell Rho pathwayLysophosphatidic acid (LPA) can be a bioactive lysophospholipid that induces pleiotropic effects in numerous cell sorts.4-Formylbenzenesulfonyl chloride Chemscene LPA mostly acts via binding to its precise Gproteincoupled receptors LPA1, which can couple to Gi, Gq, G12, and possibly Gs, to modulate particular downstream signaling pathways (1). LPA also can activate the purinergic receptors LPA6/P2Y5 (2), GPR87 (3), and P2Y10 (4), the transient receptor possible vanilloid receptor 1 cation channel (TRPV1) (5), and the intracellular peroxisome proliferatoractivator receptor (PPAR) (6). LPA receptors are expressed in many kinds of stem cells and demonstrate a differential expression profile across different cells and tissues (7, 8). LPA might be synthesized both intracellularly and extracellularly by activation of different enzymes (1); however, it is actually not yet totally clear regardless of whether or how intracellular LPA contributes to extracellular signaling. While LPA is often synthesized extracellularly by secreted phospholipases A, in particular by the secreted PLA2 group IIA (sPLA2), a major source of extracellular LPA in the central nervous program (CNS) most likely arises from the activity with the secreted lysophospholipase D enzyme autotaxin (ATX), as this enzymeThis function was supported by a National Wellness and Medical Investigation Council of Australia Profession Development Award Fellowship (A.1243313-06-5 Purity P.PMID:33540426 ), a Transport Accident Commission project grant (A.P.), plus the Victorian State Government’s Department of Innovation, Business and Regional Development’s Operational Infrastructure Help Plan. F.F. received an Australian Development Scholarship (Ads) by the Australian government (AusAID). Manuscript received 15 September 2012 and in revised type 1 March 2013. Published, JLR Papers in Press, March four, 2013 DOI 10.1194/jlr.MAbbreviations: ATX, autotaxin; bFGF, basic fibroblast growth aspect; CNS, central nervous method; EFG, epidermal development factor; hESC, human embryonic stem cell; hPSC, human pluripotent stem cell; iPSC, induced pluripotent stem cell; LPA, lysophosphatidic acid; MLC, myosin light chain; NBM, neural basal media; NEP, neuroepithelium cell line; NS/PC, neural stem/progenitor cell; ROCK, Rhoassociated kinase; TUNEL, terminal transferase dUTP nick end labeling. 1 To whom correspondence must be addressed. email: [email protected] The on-line version of this ar.