คำศัพท์ทางการแพทย์Mosquitoes in the Culex pipiens complex thrive in temperate and tropical regions worldwide, and serve as efficient vectors
of Bancroftian lymphatic filariasis (LF) caused by Wuchereria bancrofti in Asia, Africa, the West Indies, South America, and
Micronesia. However, members of this mosquito complex do not act as natural vectors for Brugian LF caused by Brugia
malayi, or for the cat parasite B. pahangi, despite their presence in South Asia where these parasites are endemic. Previous
work with the Iowa strain of Culex pipiens pipiens demonstrates that it is equally susceptible to W. bancrofti as is the natural
Cx. p. pipiens vector in the Nile Delta, however it is refractory to infection with Brugia spp. Here we report that the infectivity
barrier for Brugia spp. in Cx. p. pipiens is the mosquito midgut, which inflicts internal and lethal damage to ingested
microfilariae. Following per os Brugia exposures, the prevalence of infection is significantly lower in Cx. p. pipiens compared
to susceptible mosquito controls, and differs between parasite species with ,50% and ,5% of Cx. p. pipiens becoming
infected with B. pahangi and B. malayi, respectively. When Brugia spp. mf were inoculated intrathoracically to bypass the
midgut, larvae developed equally well as in controls, indicating that, beyond the midgut, Cx. p. pipiens is physiologically
compatible with Brugia spp. Mf isolated from Cx. p. pipiens midguts exhibited compromised motility, and unlike mf derived
from blood or isolated from the midguts of Ae. aegypti, failed to develop when inoculated intrathoracically into susceptible
mosquitoes. Together these data strongly support the role of the midgut as the primary infection barrier for Brugia spp. in
Cx. p. pipiens. Examination of parasites recovered from the Cx. p. pipiens midgut by vital staining, and those exsheathed with
papain, suggest that the damage inflicted by the midgut is subcuticular and disrupts internal tissues. Microscopic studies of
these worms reveal compromised motility and sharp bends in the body; and ultrastructurally the presence of many fluid or
carbohydrate-filled vacuoles in the hypodermis, body wall, and nuclear column. Incubation of Brugia mf with Cx. p. pipiens
midgut extracts produces similar internal damage phenotypes; indicating that the Cx. p. pipiens midgut factor(s) that
damage mf in vivo are soluble and stable in physiological buffer, and inflict damage on mf in vitro
คำศัพท์ทางการแพทย์mosquitoes in the Culex pipiens complex thrive in temperate and tropical regions worldwide, and serve as efficient vectorsof Bancroftian lymphatic filariasis (LF) caused by Wuchereria bancrofti in Asia, Africa, the West Indies, South America, andMicronesia. However, members of this mosquito complex do not act as natural vectors for Brugian LF caused by Brugiamalayi, or for the cat parasite B. pahangi, despite their presence in South Asia where these parasites are endemic. Previouswork with the Iowa strain of Culex pipiens pipiens demonstrates that it is equally susceptible to www. bancrofti as is the naturalCx. p. pipiens vector in the Nile Delta, however it is refractory to infection with Brugia spp. Here we report that the infectivitybarrier for Brugia spp. in Cx. p. pipiens is the mosquito midgut, which inflicts internal and lethal damage to ingestedmicrofilariae. Following per os Brugia exposures, the prevalence of infection is significantly lower in Cx. p. pipiens comparedto susceptible mosquito controls, and differs between parasite species with, 50% and, 5s of Cx. p. pipiens becominginfected with B. pahangi and B. malayi, respectively. When Brugia spp. mf were inoculated intrathoracically to bypass themidgut, larvae developed equally well as in controls, indicating that, beyond the midgut, Cx. p. pipiens is physiologicallycompatible with Brugia spp. Mf isolated from Cx. p. pipiens midguts exhibited compromised motility, and unlike mf derivedfrom blood or isolated from the midguts of Ae. aegypti, failed to develop when inoculated intrathoracically into susceptiblemosquitoes. Together these data strongly support the role of the midgut as the primary infection barrier for Brugia spp. inCx. p. pipiens. Examination of parasites recovered from the Cx. p. pipiens midgut by vital staining, and those exsheathed withpapain, suggest that the damage inflicted by the midgut is subcuticular and disrupts internal tissues. Microscopic studies ofthese worms reveal compromised motility and sharp bends in the body; and ultrastructurally the presence of many fluid orcarbohydrate-filled vacuoles in the hypodermis, body wall, and nuclear column. Incubation of Brugia mf with Cx. p. pipiensmidgut extracts produces similar internal damage phenotypes; indicating that the Cx. p. pipiens midgut factor (s) thatdamage mf in vivo are soluble and stable in physiological buffer, and inflict damage on mf in vitro
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Medical terminology Mosquitoes in The Culex Pipiens Complex Thrive in Temperate and Tropical Regions Worldwide, and serve As efficient vectors
of Bancroftian lymphatic Filariasis (LF) caused by Wuchereria bancrofti in Asia, Africa, The West Indies, South America, and
Micronesia. However. , Members of this Mosquito Complex do Not Act As natural vectors for Brugian LF caused by Brugia
malayi, or for The Cat Parasite B. pahangi, Despite their Presence in South Asia Where these parasites are endemic. Previous
Work with The Iowa Strain of Culex Pipiens. Pipiens demonstrates that it is equally susceptible to W. bancrofti As is The natural
Cx. P. Pipiens vector in The Nile Delta, however it is Refractory to infection with Brugia spp. Here we infectivity Report that The
Barrier for Brugia spp. in Cx. P. Pipiens is The Mosquito midgut, which inflicts internal and lethal damage to ingested
microfilariae. Following Per OS Brugia exposures, The Prevalence of infection is significantly Lower in Cx. P. Pipiens compared
to susceptible Mosquito Controls, and differs between Parasite Species with,. and 50%, 5% of Cx. P. Pipiens Becoming
infected with B. malayi and B. pahangi, respectively. When Brugia spp. MF were inoculated Intrathoracically to Bypass The
midgut, larvae developed equally Well As in Controls, Indicating that, Beyond. The midgut, Cx. P. Pipiens is physiologically
compatible with Brugia spp. Mf isolated from Cx. P. Pipiens Midguts exhibited compromised motility, and unlike MF derived
from Blood or isolated from The Midguts of Ae. aegypti, failed to Develop When inoculated Intrathoracically. Into susceptible
mosquitoes. Together these Data Strongly support The role of The midgut As The Primary infection Barrier for Brugia spp. in
Cx. P. Pipiens. Examination of parasites Recovered from The Cx. P. Pipiens midgut by Vital staining, and those Exsheathed with.
Papain, Suggest that The damage inflicted by The midgut is Subcuticular and disrupts internal tissues. Microscopic Studies of
these Worms Reveal compromised motility and sharp bends in The Body; and Ultrastructurally The Presence of many Fluid or
carbohydrate-filled vacuoles in The hypodermis, Body Wall. , and Nuclear column. Incubation of Brugia MF with Cx. P. Pipiens
midgut extracts produces similar internal damage phenotypes; Indicating that The Cx. P. Pipiens midgut factor (S) that
damage MF in Vivo are soluble and Stable in physiological buffer, and. inflict damage on mf in vitro
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