Wnt/[Beta]-catenin signaling promotes self-renewal and inhibits the primed state transition in naïve human embryonic stem cells

In both mice and humans, pluripotent stem cells (PSCs) exist in at least two distinct states of pluripotency, known as the naive and primed states. Our understanding of the intrinsic and extrinsic factors that enable PSCs to self-renew and to transition between different pluripotent states is important for understanding early development. In mouse embryonic stem cells (mESCs), Wnt proteins stimulate mESC self-renewal and support the naive state. In human embryonic stem cells (hESCs), Wnt/...-catenin signaling is active in naive-state hESCs and is reduced or absent in primed-state hESCs. However, the role of Wnt/...-catenin signaling in naive hESCs remains largely unknown. Here, we demonstrate that inhibition of the secretion of Wnts or inhibition of the stabilization of ...-catenin in naive hESCs reduces cell proliferation and colony formation. Moreover, we show that addition of recombinant Wnt3a partially rescues cell proliferation in naive hESCs caused by inhibition of Wnt secretion. Notably, inhibition of Wnt/...-catenin signaling in naive hESCs did not cause differentiation. Instead, it induced primed hESC-like proteomic and metabolic profiles. Thus, our results suggest that naive hESCs secrete Wnts that activate autocrine or paracrine Wnt/...-catenin signaling to promote efficient self-renewal and inhibit the transition to the primed state. (ProQuest: ... denotes formulae/symbols omitted.)