ARACHIDONIC METABOLISM PATHWAY Introduction Arachidonic Acid pathway describes the synthesis of different Prostanoids (PGs, TXs, Prostacyclin) and Leukotrienes, Cysteinyl Leukotrienes, and Lipoxanes. Steps of AA pathway Step – 01 (Activation of Phospholipase A 2 and release of Arachidonic Acid) Release of AA from phospholipid membrane is carried out by Phospholipase A2 Stimuli initiates the Ca+2 dependent translocation of cytosolic PLA2 to the membrane where it hydrolyses the AA and releases It into the cytosol. Step – 02 (Cyclooxygenase Pathway) Arachidonic acid is converted to Prostaglandin G2 and Prostaglandin H2 catalyzed by Cyclooxygenase (COX-1 & COX-2) enzyme. Prostaglandin H2 is then Converted to various Prostanoids by several enzymes- Thromboxane A2 ( Converted by Thromboxane A synthase ) Prostaglandin E2 ( Microsomal Prostaglandin E synthase and cytosolic prostaglandin E Synthase ) Prostaglandin F 2 alpha ( Prostaglandin F synthase ...
In spite of its effective analgesic activity aspirin is used in prevention of formation of atherosclerotic disorder – explain why?? Aspirin , also known as acetylsalicylic acid ( ASA ), is a nonsteroidal anti-inflammatory drug (NSAID) used to reduce pain , fever , and/or inflammation , and as an antithrombotic . Aspirin is widely known for its analgesic (pain-relieving) properties, but it also plays a crucial role in the prevention of atherosclerotic disorders. Aspirin irreversibly inactivates the Cyclooxygenase Enzyme ( Prostaglandin Endoperoxide Synthase ) in the Arachidonic Acid Metabolism Pathway , and supress the production of Prostaglandin (PGs) and Thromboxane (TXs) and Prostacyclin ( Prostanoids ). Atherosclerosis, also known as arteriosclerosis, is a condition where the arteries become thick and stiff due to the buildup of plaque. The plaque can also burst, leading to a blood clot. ASPIRIN EFFECT ON PLAT...
Mode of action of Oral hypoglycemic Agents Sodium-glucose cotransporter 2 (SGLT2) inhibitors, also known as gliflozins , are a class of oral hypoglycemic agents used to lower blood glucose levels in adults with type 2 diabetes. Examples: Dapagliflozin, Empagliflozin etc. Mode of Action: They work by blocking the function of the SGLT2 protein within the kidneys (PCT, 90% glucose reabsorption). This protein is primarily tasked with the reabsorption of glucose from the glomerular ultrafiltrate . By inhibiting SGLT2, these drugs prevent the reabsorption of glucose, leading to increased urinary glucose excretion. This mechanism corrects hyperglycemia independently of insulin. As a result, blood glucose levels are reduced. Note: In addition to their glucose-lowering effect, SGLT2 inhibitors have been found to have benefits on cardiovascular and renal outcomes, independent of their effects on blood glucose. They may also promote weight loss and mo...
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