Abstract
Directly involved in the "suck-and-spit" physiology, female mosquito salivary glands (SGs) primarily imbibe blood for egg development and release anticoagulants to keep blood flowing. Indirectly involved, mosquitoes can uptake arboviruses during blood feeding from a viremic host. This research examined the presence of the filamentous cytoplasmic contractile protein (F-actin) and heparan sulfate proteoglycan (HSPG), in the female mosquito SGs. Immunofluorescent antibody labeling of actin molecules or HSPG combined with anatomy suggests that F-actin forms a network in the SG lobe parenchymal cells attached to intralobar ducts by HSPG. In addition, F-actin twists around intralobar SG ducts in a beaded manner, altogether involved in the expulsion of SG secretions. This arrangement in female Aedes aegypti SGs, suggests that F-actin structures are integrally involved in transmitting infectious agents into hosts.
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