The fate of the filaria litomosoides sigmodontis in susceptible and naturally resistant mice

被引:47
作者
Marechal, P
LeGoff, L
Petit, G
Diagne, M
Taylor, DW
Bain, O
机构
[1] UNIV EDINBURGH, ROYAL DICK SCH VET STUDIES, CTR TROP MED, EDINBURGH EH25 9RG, MIDLOTHIAN, SCOTLAND
[2] UNIV PARIS SUD, FAC PHARM, SERV COMMUN ANIMALERIE, F-929290 PARIS, FRANCE
关键词
filariae; mice; quantitative analysis; lymphatic biology; resistance; competition; litomosoides;
D O I
10.1051/parasite/1996031025
中图分类号
R38 [医学寄生虫学]; Q [生物科学];
学科分类号
07 ; 0710 ; 09 ; 100103 ;
摘要
The fate of Litomosoides sigmodontis was compared in susceptible BALB/c and resistant B10D2 mice, presenting the same major histocompatibility complex (H-2(d)), with an attempt to dissociate the different elements of the life cycle in order, later, to dissociate the different mechanisms involved. Each female mouse was inoculated once with a small dose of infective larvae (25 L3) or a large dose [100 or 200 L3). In total, 92 BALB/c and 49 B1OD2 were studied. Necropsies were performed up to D85 following infection with 25 larvae. The early fate was similar in D10D2 and BALB/c mice; particularly the recovery rate of worms was almost identical during the first month p.i. and represented a quarter of the inoculated larvae. Resistance in B10D2 mice appeared progressively, as judged by retardation of growth acid of the fourth moulting, the presence of very small sterile female worms and male worms with abnormal left spicule, and a high frequency of live filariae coated with inflammatory cells and encapsulated dead worms. The L. sigmodontis life span in B10D2 was about half that in BALB/c. Necropsies were carried out up to D20 following infection with 100-200 L3. The recovery rate was increased in BALB/c. Growth was retarded earlier in B10D2 mice, this crowding effect already apparent at D10; this may indicate a role for metabolic factors. The pattern of the life cycle in both mouse strains confirms recent conclusions on Onchocercinae: the recovery rate is established as soon as the second day during ''phase 1 of massive destruction'', then ii is stable during ''phase 2 of insignificant mortality''. During phase 1, the infective larvae are immediately destroyed in the subcutaeous tissue if they are not able to escape the inflammatory process by penetrating in local lymphatic vessels. By contrast, phase 2, which is longer than the duration of the third larval stage, indicates there is no mortality linked io the third moulting, at least following a single inoculation.
引用
收藏
页码:25 / 31
页数:7
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