Temporary shift of microfilariae of Brugia pahangi from the lungs to muscles in Mongolian jirds, Meriones unguiculatus, after a single injection of diethylcarbamazine.
A single-dose treatment with diethylcarbamazine (DEC) reduced microfilaria (mf) counts of Brugia pahangi by >90% at 30 min post-treatment in Mongolian jirds (Meriones unguiculatus). The reduction was followed by a rapid increase in microfilaremia, with the count reaching pretreatment level in 3 hr. The mechanisms behind this temporary reduction of mf were investigated. Without treatment, mf accumulated in the lungs. At 30 min post-treatment, they had moved from the lungs and accumulated in the muscle. At the same time, electron microscopy revealed many mf in the muscle interstitium. DEC concentrations at 30 min were much lower in the muscle (12.2 microg/g of tissue) than in the lungs, liver, and kidneys (19.8-40.7 microg/g), all of which declined to < 0.6 microg/g by 3 hr. The presence of mf in the muscle would be advantageous for avoiding high DEC concentrations, and their extravascular location could prevent attack by host effector cells.
Shigeno
Shizugi
S
Department of Parasitology, Institute of Tropical Medicine, Nagasaki University, Nagasaki 852-8523, Japan.
Fujimaki
Yasunori
Y
Toriyama
Kanan
K
Ichinose
Akitoyo
A
Mitsui
Yoshinori
Y
Aoki
Yoshiki
Y
Kimura
Eisaku
E
D000818:Animals; D001808:Blood Vessels / Q000469:parasitology / Q000648:ultrastructure; D017179:Brugia pahangi / Q000187:drug effects* / Q000502:physiology / Q000648:ultrastructure; D004049:Diethylcarbamazine / Q000097:blood / Q000493:pharmacokinetics / Q000494:pharmacology*; D004195:Disease Models, Animal; D005369:Filaricides / Q000097:blood / Q000493:pharmacokinetics / Q000494:pharmacology*; D005849:Gerbillinae; D006321:Heart / Q000469:parasitology; D007668:Kidney / Q000378:metabolism / Q000469:parasitology; D008099:Liver / Q000378:metabolism / Q000469:parasitology; D008168:Lung / Q000378:metabolism / Q000469:parasitology*; D008297:Male; D008842:Microfilariae / Q000187:drug effects / Q000502:physiology / Q000648:ultrastructure; D046529:Microscopy, Electron, Transmission; D018482:Muscle, Skeletal / Q000378:metabolism / Q000469:parasitology* / Q000648:ultrastructure; D009206:Myocardium / Q000378:metabolism
D005369:Filaricides; D004049:Diethylcarbamazine