Malaria Life Cycle :: essays research papers

Page 1 of 6Life Cycle of MalariaPage 2 of 6Malaria is an antique disease transmitted by the Anopheles mosquito that predates recorded history. Historically it was common in the swampy aras around Rome, and was believed that the tainted air in those locations made tidy sum very sick, the disease was therefore named malaria for the Latin root words bad air. Malaria is caused by small parasitic protozoa of the genus Plasmodium which infects both humans and mosquitoes in a cyclical cultivate. It is carried by only by female mosquitoes residing in tropical and subtropical areas and is injected into unsuspecting human hosts by the bite of an infected mosquito. This fact Plasmodium is highly specific to infecting humans as we are the only vertebrates infected and the Anopheles mosquitoes are the vectors. (1). This papers main focus shall be the process by which a malarial plasmodium colonizes and infects a human host, the methods the body employs to control the infection and the conti nuous life cycle completed between the two hosts.To understand any disease in humans one must first understand how it arrives into the body and what processes ensue. The following shall first describe the transmition of the disease and thus the colonization that takes place.During a line meal on a human a female mosquito must inject her saliva containing an anticoagulant agent to master and even flow of blood into the mouth (1). With the saliva comes malarial sporozoites which, within minutes of direct contact with the blood take an immediate route with the circulation of blood to the liver of the human (2). Research has indicated that once the sporozoites arrive in the livers sinusoidal cavities they stop their movement by using two major surface proteins, the circumsporozoite and the thormbospondin-related sticking protein (3). Research Page 3 of 6 conducted by Pradel et al. suggests that the sporozoites use these surface proteins to attach to proteoglycans in the sinusoidal extracellular matrix to slow their travel done the liver and then bind to chondroiten and heparin sulfate proteoglycans on the Kupfer cells. The Kupfer cells then become the doorways through which the sporozoite leaves the circulatory system and enters the underlying hepatocytes.Once the sporozoites invade the hepatocytes they are protected from the immune system by a parasitophosphorous (4) vacuole that does not colocalize with the normal signals for acidifying organelles (2). Because the body doesnt recognize the vacuole as a threat at this draw it remains safely with in the hepatic cell where it will stay for 9-16 days and differentiate into haploid cells called schizont which contain nearly 30,000 compact cells called merozoites (1).