{"id":1333,"date":"2020-10-10T17:19:37","date_gmt":"2020-10-10T09:49:37","guid":{"rendered":"http:\/\/bioactivecompoundlibrary.com\/?p=1333"},"modified":"2022-01-11T17:19:25","modified_gmt":"2022-01-11T09:49:25","slug":"released-necrotic-cells-vitro-transcription-reported-endogenous-ligand-tlr3","status":"publish","type":"post","link":"http:\/\/bioactivecompoundlibrary.com\/index.php\/2020\/10\/10\/released-necrotic-cells-vitro-transcription-reported-endogenous-ligand-tlr3\/","title":{"rendered":"Released from necrotic cells or associated with in vitro transcription was reported to be an endogenous ligand for TLR3"},"content":{"rendered":"

Increased in placentas of TLR3\/7\/8 agonist-treated mice, potentiate a T helper cell type 17 immune response characteristic of PE. More studies are needed to determine the temporal and GSI-IX<\/a> functional effects of altered placental gene expression including the placental downregulation of osteopontin and IL-18 and their role in the development of PE. Similar to TLR3 activation, TLR7\/8 activation during pregnancy in mice caused pregnancy-dependent hypertension, endothelial dysfunction, splenomegaly, and an increased incidence of fetal demise. Importantly, blood pressure and endothelial function were not affected by TLR7 or TLR7\/8 activation in non-pregnant mice. These findings demonstrate that placental activation of TLR3\/7\/8 is crucial for the development of endothelial dysfunction and hypertension during pregnancy. Fetal demise in mice likely results from placental dysfunction and decreased placental perfusion and somewhat mimics intra-uterine growth restriction, commonly seen in women with PE. We reported that TLR3 ligation in mice increased the incidence of fetal demise, and almost identical results were seen in TLR7 as well as TLR7\/8 agonist-treated mice. A previous study found that rats treated with the TLR4 agonist lipopolysaccharide at gestational day 14.5 also exhibited increased fetal demise as a result of decreased placental perfusion. Although TLR3 and TLR7 activation induced proteinuria, TLR7\/ 8 activation did not. Some studies have demonstrated that not only is TLR8 functional in mice, but that it may suppress TLR7-mediated effects. Demaria and colleagues reported that Tlr82\/2 mice develop autoimmune glomerulonephritis due to excessive TLR7 expression and activation, and that this was attenuated in double Tlr72\/ 2\/ Tlr82\/2 mice. Unfortunately, urinary protein concentrations were not measured, but their findings together with our results suggest that the stimulation of renal, not placental, TLR8 may have a protective effect on renal function. Nonetheless, excessive activation of placental TLR7\/8 is sufficient to induce pregnancydependent hypertension and endothelial dysfunction similar to that induced by TLR3 activation. However, examination of the role of TLR8 signaling in the mouse and how this might contribute to the development of PE-like symptoms is needed. If TLR8 signaling in mice is found to be non-functional, then it is likely that the mechanisms that cause PE in CLO97-treated mice are due to TLR7 activation, similar to that of R837-treated mice. Placental activation of TLR3\/7\/8 by dsRNA and ssRNA could arise from latent viruses, viruses acquired during gestation, as well as excessive cellular necrosis\/apoptosis resulting from aberrant implantation, placentation, placental hypoxia, and\/or trophoblast invasion. While extracellular heterologous RNA levels are normally low, high levels of extracellular heterologous RNA are evident at sites of inflammation and tissue necrosis, similar to that of dsRNA and ssRNA. Whether heterologous RNA can also activate TLR7\/8 is unknown currently. While TLR3 signals through Toll-IL-1 receptordomain-containing adaptor inducing interferon-b, TLR7 and TLR8 signal through myeloid differentiation marker 88. However, both pathways converge to activate NF-kB leading to the transcription of numerous pro-inflammatory chemokines and cytokines. Inflammation is necessary for placental and fetal development, however excessive inflammation resulting from persistent placental TLR3\/7\/8 activation may explain the increase in circulating pro-inflammatory cytokines evident in women with PE. Here we demonstrate that TLR3, TLR7, and TLR8 levels are significantly increased in placentas from PE women at delivery.<\/p>\n","protected":false},"excerpt":{"rendered":"

Increased in placentas of TLR3\/7\/8 agonist-treated mice, potentiate a T helper cell type 17 immune response characteristic of PE. More studies are needed to determine the temporal and GSI-IX functional effects of altered placental gene expression including the placental downregulation of osteopontin and IL-18 and their role in the development of PE. Similar to TLR3… Continue reading Released from necrotic cells or associated with in vitro transcription was reported to be an endogenous ligand for TLR3<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/bioactivecompoundlibrary.com\/index.php\/wp-json\/wp\/v2\/posts\/1333"}],"collection":[{"href":"http:\/\/bioactivecompoundlibrary.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/bioactivecompoundlibrary.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/bioactivecompoundlibrary.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/bioactivecompoundlibrary.com\/index.php\/wp-json\/wp\/v2\/comments?post=1333"}],"version-history":[{"count":1,"href":"http:\/\/bioactivecompoundlibrary.com\/index.php\/wp-json\/wp\/v2\/posts\/1333\/revisions"}],"predecessor-version":[{"id":1334,"href":"http:\/\/bioactivecompoundlibrary.com\/index.php\/wp-json\/wp\/v2\/posts\/1333\/revisions\/1334"}],"wp:attachment":[{"href":"http:\/\/bioactivecompoundlibrary.com\/index.php\/wp-json\/wp\/v2\/media?parent=1333"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/bioactivecompoundlibrary.com\/index.php\/wp-json\/wp\/v2\/categories?post=1333"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/bioactivecompoundlibrary.com\/index.php\/wp-json\/wp\/v2\/tags?post=1333"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}