{"id":78,"date":"2026-03-07T16:49:24","date_gmt":"2026-03-07T16:49:24","guid":{"rendered":"http:\/\/200okconsulting.com\/?p=78"},"modified":"2026-03-07T16:49:24","modified_gmt":"2026-03-07T16:49:24","slug":"the-integrity-of-rna-was-checked-on-a-1-agarose-formaldehyde-gel","status":"publish","type":"post","link":"https:\/\/200okconsulting.com\/?p=78","title":{"rendered":"\ufeffThe integrity of RNA was checked on a 1% agarose-formaldehyde gel"},"content":{"rendered":"

\ufeffThe integrity of RNA was checked on a 1% agarose-formaldehyde gel. LPS repressed lipin-1, we examined the effect of proinflammatory cytokines on cultured adipocytes. In 3T3-L1 adipocytes, TNF-, IL-1, and IFN-, but not LPS or IL-6, caused a decrease in lipin-1 mRNA levels. Furthermore, TNF- and IL-1 administration also decreased mRNA levels of lipin-1 in adipose tissue in mice. Importantly, the LPS-induced decrease in lipin-1 mRNA levels was significantly Sarsasapogenin but not totally blunted in TNF-\/IL-1 receptor-null mice compared with controls, suggesting key roles for TNF-\/IL-1 and other cytokines in mediating LPS-induced repression of lipin-1. Together, our results demonstrate that expression of lipin-1, one of the essential triglyceride synthetic enzymes, was suppressed by LPS, zymosan, and proinflammatory cytokines in mouse adipose tissue and in cultured 3T3-L1 adipocytes, which could contribute to a decrease in the utilization of FFA to synthesize triglycerides in adipose tissue, thus promoting the release of FFA into the circulation. Keywords:inflammation, peroxisome proliferator-activated receptor, zymosan, tumor necrosis factor, interleukin-1, fatty acids, lipopolysaccharide inflammation induces theacute-phase response (APR), which results in marked changes in protein synthesis and intermediary metabolism. The APR occurs in response to infectious agents, severe inflammation, or the chronic low-grade inflammation found in atherosclerosis, the metabolic syndrome, and diabetes (13,15,18,22,39,40). Many of the changes that occur during the APR are mediated by cytokines, particularly TNF- and IL-1, which rapidly increase with infections or following lipopolysaccharide (LPS) administration (13,22). Cytokines induce the APR primarily by increasing or decreasing gene transcription (13,21,22). The APR results in dramatic alterations in lipid and lipoprotein metabolism, including enhanced lipolysis, increased circulating free fatty acids (FFAs), hypertriglyceridemia, and decreased HDL cholesterol levels. Sarsasapogenin Enhanced lipolysis increases circulating FFAs that are delivered to the liver and stimulate the synthesis of triglycerides, resulting in increased VLDL secretion and hypertriglyceridemia (18). Therefore, dysregulation of triglyceride metabolism in adipose tissue plays an important role in the dyslipidemia that occurs in association with inflammation. It has been well documented that LPS and cytokines induce lipolysis mainly by posttranslational phosphorylation of hormone-sensitive lipase (HSL) and its associated protein perilipins (14,42,43). Phosphorylation of HSL increases its lipolytic activity (14), whereas phosphorylation of perilipins induces translocation of HSL to the lipid-rich droplet, where lipolysis occurs. Furthermore, a decrease in perilipin protein content may serve as an additional mechanism for TNF-induced lipolysis (36). In addition to lipolysis, LPS and cytokines may also enhance FFA mobilization by decreasing the expression of triglyceride biosynthetic enzymes (4,27). In adipose tissue, triglyceride synthetic enzymes are highly expressed, and the Sarsasapogenin released FFAs may be quickly reesterified by these abundant enzymes (5,6). Therefore, repressed triglyceride biosynthesis in addition to activated lipolysis Sarsasapogenin<\/a> is required for effective fatty acid mobilization during inflammation. In adipose tissue, triglyceride is synthesized by a stepwise acylation of glycerol phosphate to form phosphatidic acids, essential intermediates for all glycerolipid biosynthesis (3,5). Phosphatidic acid is then hydrolyzed by Sarsasapogenin Mg2+-dependent phosphatidate phosphatase (PAP1) to form the critical diacylglyceride pool for triglyceride biosynthesis. Because PAP1 is situated at a branch point between monoglycerolipid and polyglycerolipid biosynthetic pathways, regulation of PAP1 is an important control point for glyceride biosynthesis (3). Both genetic and experimental evidence supports this concept. For example, the predominant PAP1 in adipose tissue is lipin-1. Deficiency of lipin-1 leads to lipodystrophy, characterized by a severe deficiency in adipose tissue mass (31,33). Conversely, lipin-1 overexpression in adipose tissue promotes obesity (32). In addition to its PAP1 activities, lipin-1 may also serve as a transcriptional coactivator and participate in the hepatic PGC-1\/peroxisome proliferator-activated receptor (PPAR)- regulatory pathway to upregulate mitochondrial oxidation (12). Recently, the association of lipin-1 gene polymorphisms with energy and glucose metabolism and phenotypes of the metabolic syndrome in humans has been Mcam<\/a> observed (8,25,38). Furthermore, adipose tissue lipin-1 expression is found to correlate with PPAR- gene expression and insulin sensitivity in healthy young men (10). Therefore, lipin-1 may have broader effects on energy metabolism and triglyceride biosynthesis (34). To add another layer of complexity, there are three members in the lipin gene family, namely lipin-1, -2, and -3 (31,34). These genes share high sequence homology but are encoded by distinct genes. Although all three lipins have been shown to possess PAP1 activities, they exhibit different.<\/p>\n","protected":false},"excerpt":{"rendered":"

\ufeffThe integrity of RNA was checked on a 1% agarose-formaldehyde gel. LPS repressed lipin-1, we examined the effect of proinflammatory cytokines on cultured adipocytes. In…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":["post-78","post","type-post","status-publish","format-standard","hentry","category-mapk-signaling"],"_links":{"self":[{"href":"https:\/\/200okconsulting.com\/index.php?rest_route=\/wp\/v2\/posts\/78","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/200okconsulting.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/200okconsulting.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/200okconsulting.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/200okconsulting.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=78"}],"version-history":[{"count":1,"href":"https:\/\/200okconsulting.com\/index.php?rest_route=\/wp\/v2\/posts\/78\/revisions"}],"predecessor-version":[{"id":79,"href":"https:\/\/200okconsulting.com\/index.php?rest_route=\/wp\/v2\/posts\/78\/revisions\/79"}],"wp:attachment":[{"href":"https:\/\/200okconsulting.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=78"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/200okconsulting.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=78"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/200okconsulting.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=78"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}