What enzyme is involved in the initiation of preterm labor by bacteria?

What enzyme is involved in the initiation of preterm labor by bacteria?

• A. Prostaglandin E
• B. Phospholipase A2
• C. Cyclooxygenase
• D. Lipoxygenase

Answer: (B)

Phospholipase A2 plays a crucial role in the initiation of preterm labor, particularly in the context of bacterial infection. This enzyme is responsible for the hydrolysis of phospholipids in cell membranes, leading to the release of arachidonic acid. Arachidonic acid is a key precursor for the synthesis of several inflammatory mediators, including prostaglandins and leukotrienes, which are pivotal in the labor process. In the setting of infection, bacteria can stimulate the activation of phospholipase A2, resulting in increased levels of inflammatory mediators that promote uterine contractions and cervical dilation, ultimately leading to preterm labor. The activation of this enzyme and subsequent inflammatory cascade is a significant pathophysiological mechanism by which bacterial infections can precipitate preterm birth. While other enzymes like cyclooxygenase and lipoxygenase also play roles in producing inflammatory mediators, phospholipase A2 is specifically involved in the initial step of releasing the fatty acids that are then metabolized by these enzymes to produce substances like prostaglandins and leukotrienes, which are instrumental in labor initiation. Thus, phospholipase A2's direct involvement in the inflammatory response linked to preterm labor makes it

Phospholipase A2 plays a crucial role in the initiation of preterm labor, particularly in the context of bacterial infection. This enzyme is responsible for the hydrolysis of phospholipids in cell membranes, leading to the release of arachidonic acid. Arachidonic acid is a key precursor for the synthesis of several inflammatory mediators, including prostaglandins and leukotrienes, which are pivotal in the labor process.

In the setting of infection, bacteria can stimulate the activation of phospholipase A2, resulting in increased levels of inflammatory mediators that promote uterine contractions and cervical dilation, ultimately leading to preterm labor. The activation of this enzyme and subsequent inflammatory cascade is a significant pathophysiological mechanism by which bacterial infections can precipitate preterm birth.

While other enzymes like cyclooxygenase and lipoxygenase also play roles in producing inflammatory mediators, phospholipase A2 is specifically involved in the initial step of releasing the fatty acids that are then metabolized by these enzymes to produce substances like prostaglandins and leukotrienes, which are instrumental in labor initiation. Thus, phospholipase A2's direct involvement in the inflammatory response linked to preterm labor makes it