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RhoA/MLC signaling pathway is involved in Δ⁹-tetrahydrocannabinol-impaired placental angiogenesis.
Toxicology Letters 2018 March 16
Cannabis is a widely used illicit drug and its abuse during pregnancy has been related to adverse reproductive outcomes. In addition, placental angiogenesis is considered to be responsible for the transport of nutrients critical for placental development and fetal growth. The purpose of this study is to determine the effects of Δ⁹-tetrahydrocannabinol (THC), the major component of cannabis, on placental angiogenesis, involving endothelial cell (EC) proliferation, migration and tube formation. Here, we observe dramatic alterations in placental vascular network of cannabis users correlated with an impaired HUVE cell proliferation, migration and tube formation after treated with THC. Mechanistically, the activity of RhoA/MLC is involved in the THC-impaired EC migration and angiogenesis. To further analyze the role of cannabis in mice placental and embryonic development, we inject pregnant mice with THC daily. This treatment results in an altered placental microvasculature, accompanied by the decreased expression of CD31 and activity of RhoA/MLC. Taken together, these findings identify THC plays a pivotal role in impairing placental angiogenesis potentially via RhoA/MLC signaling nexus.
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