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Using human IAS tissues, we identified the presence of the biosynthetic machineries for angiotensin II (ANG II), thromboxane A<jats:sub>2<\/jats:sub>(TXA<jats:sub>2<\/jats:sub>), and prostaglandin F<jats:sub>2\u03b1<\/jats:sub>(PGF<jats:sub>2\u03b1<\/jats:sub>). These end products of the renin-angiotensin system (RAS) (ANG II) and arachidonic acid (TXA<jats:sub>2<\/jats:sub>and PGF<jats:sub>2\u03b1<\/jats:sub>) pathways and their effects in human IAS vs. rectal smooth muscle (RSM) were studied. A multipronged approach utilizing immunocytochemistry, Western blot analyses, and force measurements was implemented. Additionally, in a systematic analysis of the effects of respective inhibitors along different steps of biosynthesis and those of antagonists, their end products were evaluated either individually or in combination. To further describe the molecular mechanism for the IAS tone via these pathways, we monitored RhoA\/ROCK activation and its signal transduction cascade. Data showed characteristically higher expression of biosynthetic machineries of RAS and AA pathways in the IAS compared with the RSM. Additionally, specific inhibition of the arachidonic acid (AA) pathway caused \u223c80% decrease in the IAS tone, whereas that of RAS lead to \u223c20% decrease. Signal transduction studies revealed that the end products of both AA and RAS pathways cause increase in the IAS tone via activation of RhoA\/ROCK. Both AA and RAS (via the release of their end products TXA<jats:sub>2<\/jats:sub>, PGF<jats:sub>2\u03b1<\/jats:sub>, and ANG II, respectively), provide extracellular signals which activate RhoA\/ROCK for the maintenance of the basal tone in human IAS.<\/jats:p>","DOI":"10.1152\/ajpgi.00017.2015","type":"journal-article","created":{"date-parts":[[2015,4,17]],"date-time":"2015-04-17T03:01:32Z","timestamp":1429239692000},"page":"G924-G933","source":"Crossref","is-referenced-by-count":16,"title":["Nature of extracellular signal that triggers RhoA\/ROCK activation for the basal internal anal sphincter tone in humans"],"prefix":"10.1152","volume":"308","author":[{"given":"Satish","family":"Rattan","sequence":"first","affiliation":[{"name":"Department of Medicine, Division of Gastroenterology and Hepatology, Thomas Jefferson University, Philadelphia, Pennsylvania; 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