{"id":697,"date":"2016-11-08T16:03:31","date_gmt":"2016-11-08T16:03:31","guid":{"rendered":"http:\/\/biodigestor.net\/?p=697"},"modified":"2016-11-08T16:03:31","modified_gmt":"2016-11-08T16:03:31","slug":"in-h295r-human-adrenocortical-cells-acth-rapidly-activates-ceramide-cer-and","status":"publish","type":"post","link":"https:\/\/biodigestor.net\/?p=697","title":{"rendered":"In H295R human adrenocortical cells ACTH rapidly activates ceramide (Cer) and"},"content":{"rendered":"

In H295R human adrenocortical cells ACTH rapidly activates ceramide (Cer) and sphingosine (SPH) turnover having a concomitant upsurge in SPH-1-phosphate secretion. a job because of this enzyme in glucocorticoid creation. Here the part of ASAH1 in regulating steroidogenic capability was examined utilizing a tetracycline-inducible ASAH1 brief hairpin RNA H295R human being adrenocortical steady cell range. We display that ASAH1 suppression escalates the transcription of multiple steroidogenic genes including Cytochrome P450 monooxygenase (CYP)17A1 CYP11B1\/2 CYP21A2 steroidogenic severe regulatory protein hormone-sensitive lipase 18 translocator protein and the melanocortin-2 receptor. Induced gene expression positively correlated with enhanced histone H3 acetylation at target promoters. Repression of ASAH1 expression also induced the expression of members of the nuclear receptor nuclear receptor subfamily 4 (NR4A) family JAZ<\/a> while concomitantly suppressing the expression of dosage-sensitive sex reversal adrenal hypoplasia critical region on chromosome X gene 1. ASAH1 knockdown altered the expression of genes involved in sphingolipid metabolism and changed the cellular amounts of distinct sphingolipid species. Finally ASAH1 silencing increased basal and cAMP-dependent cortisol and dehydroepiandrosterone secretion establishing ASAH1 as a pivotal regulator of steroidogenic capacity in the human adrenal cortex. In the human adrenal cortex cortisol is synthesized from cholesterol by cytochrome P450 monooxygenase (CYP)11A1 CYP17A1 CYP11B1\/2 and CYP21A2 and 3\u03b2-hydroxysteroid dehydrogenase (3\u03b2-HSD) type Secretin (human) II enzymes in a process primarily regulated by the peptide hormone ACTH (1-4). In the zonae fasciculata and reticularis ACTH increases steroid hydroxylase gene expression by activating adenylyl cyclase and consequently increasing intracellular Secretin (human) cAMP (4). This second messenger activates protein kinase A which acutely promotes cholesterol mobilization to the inner mitochondrial membrane and chronically induces the transcription of genes required for steroid hormone production (3 5 The transcription of most steroidogenic genes is regulated by the nuclear receptor steroidogenic factor 1 (SF-1) nuclear receptor (NR)5A1 which in response to ACTH signaling binds to target promoters and facilitates the recruitment of coactivator proteins (3 4 8 Further additional transcription Secretin (human)<\/a> regulators including \u03b2-catenin (12 13 dosage-sensitive sex reversal adrenal hypoplasia critical region on chromosome X gene 1 (DAX-1) (NR0B1) (14 15 and the NR4A category of transcription elements (16-19) are similarly important for keeping optimal transcriptional result. Sphingolipids have surfaced as essential second messengers in a variety of signaling transduction pathways (20-27). In steroidogenesis sphingosine (SPH) modulates steroidogenic gene transcription Secretin (human) by offering as an antagonist for SF-1 (28). We’ve previously proven that SPH will SF-1 under basal circumstances which cAMP excitement promotes SPH displacement through the receptor’s ligand-binding pocket. SPH binding to SF-1 antagonizes the power of cAMP to activate CYP17A1 gene transcription and stimulate dehydroepiandrosterone (DHEA) creation. Silencing the manifestation from the SPH-generating enzyme acidity ceramidase (ASAH1) mimics cAMP-stimulated CYP17A1 transcription (28) which helps a role because of this enzyme in regulating SF-1 function and steroidogenic gene transcription. In lots of respects steroid hormone biosynthesis and sphingolipid rate of metabolism possess a reciprocal romantic relationship (29). In H295R cells ACTH stimulates sphingolipid rate of metabolism by rapidly advertising the catabolism of sphingomyelin (SM) ceramide (Cer) and SPH (30). ACTH\/cAMP signaling acutely escalates the enzymatic actions of SPH kinase (SK) (30 31 and ASAH1 (32) in H295R cells. Further we’ve recently founded that cAMP-responsive element-binding proteins is an important transcriptional regulator from the ASAH1 gene in H295R cells (32). Ceramidases (activity as acidity (ASAH1) natural (ASAH2) and three isoforms of alkaline [alkaline ceramidase (ACER)1-ACER3] (33). ASAH1 is Secretin (human) really a glycoprotein prepared from a 55-kDa precursor via autoproteolytic cleavage (34) right into a adult heterodimeric enzyme shaped by an \u03b1-subunit (13 kDa) along with a \u03b2-subunit (40 kDa) (35). Because Cer degradation may be the only way to obtain mobile SPH (36) these.<\/p>\n","protected":false},"excerpt":{"rendered":"

In H295R human adrenocortical cells ACTH rapidly activates ceramide (Cer) and sphingosine (SPH) turnover having a concomitant upsurge in SPH-1-phosphate secretion. a job because of this enzyme in glucocorticoid creation. Here the part of ASAH1 in regulating steroidogenic capability was examined utilizing a tetracycline-inducible ASAH1 brief hairpin RNA H295R human being adrenocortical steady cell range.… Continue reading In H295R human adrenocortical cells ACTH rapidly activates ceramide (Cer) and<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[56],"tags":[672,673],"class_list":["post-697","post","type-post","status-publish","format-standard","hentry","category-adenosine-transporters","tag-jaz","tag-secretin-human","entry"],"_links":{"self":[{"href":"https:\/\/biodigestor.net\/index.php?rest_route=\/wp\/v2\/posts\/697"}],"collection":[{"href":"https:\/\/biodigestor.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/biodigestor.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/biodigestor.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/biodigestor.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=697"}],"version-history":[{"count":1,"href":"https:\/\/biodigestor.net\/index.php?rest_route=\/wp\/v2\/posts\/697\/revisions"}],"predecessor-version":[{"id":698,"href":"https:\/\/biodigestor.net\/index.php?rest_route=\/wp\/v2\/posts\/697\/revisions\/698"}],"wp:attachment":[{"href":"https:\/\/biodigestor.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=697"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/biodigestor.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=697"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/biodigestor.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=697"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}