[Detection of Trypanosoma cruzi DNA in the placenta and fetuses of mice with Chagasic acute infection].
The objective of the present study was to detect the presence of Trypanosoma cruzi DNA in the placenta and fetal tissues of NMRI mice (Mus musculus) inoculated with 22 x 10(3) trypomastigotes metacyclic of the M/HOM/BRA/53/Y strain by intraperitoneal route. Mice were pregnant in the acute phase of the infection. The course of patent parasitemia by T. cruzi was evaluated before mating and during pregnancy. At day twenty of gestation, animals were sacrificed and the fetuses and their placentas were removed to evaluate T. cruzi infection. Samples of fetal placenta, heart and skeletal muscle were fixed in 10%, formalin, included in paraffin and stained with hematoxilin and eosin (HE). The histopathological study of sections of fetal tissues revealed inflammatory infiltrates with mononuclear and polymorphonuclear cells and without parasitism in these tissues. The amplification of T. cruzi DNA by Polymerase Chain Reaction (PCR) showed a positive reaction in 18% of placental tissue of pregnant infected mice. The samples of heart and skeletal muscle of the fetuses of mothers infected with T. cruzi did not show the presence T. cruzi DNA. The placenta and skeletal muscle of the fetuses analyzed by Peroxidase anti Peroxidase inmunostaining showed T. cruzi antigens in those tissues. Negative results by PCR in fetal tissues might be related with the virulence and tropism associated with the biological and genetic characteristic Of the T. cruzi strain used in the experimental infection of female mice.
Alarcón
Maritza
M
Laboratorio de Parasitología Experimental (LAPEX), Facultad de Ciencias, Universidad de los Andes, Mérida, Venezuela. amaritza@ula.ve
Pérez
Mary Carmen
MC
Villarreal
Juana
J
Araujo
Sonia
S
Goncalves
Loredana
L
González
Anajulia
A
Moreno
Elio
E
Lugo-Yarbuh
Ana
A
D000208:Acute Disease; D000818:Animals; D000953:Antigens, Protozoan / Q000032:analysis; D014355:Chagas Disease / Q000276:immunology / Q000469:parasitology* / Q000635:transmission; D016054:DNA, Protozoan / Q000032:analysis*; D005260:Female; D005315:Fetal Diseases / Q000276:immunology / Q000469:parasitology*; D005333:Fetus / Q000276:immunology / Q000469:parasitology*; D006321:Heart / Q000469:parasitology; D018445:Infectious Disease Transmission, Vertical; D008431:Maternal-Fetal Exchange; D051379:Mice; D018482:Muscle, Skeletal / Q000196:embryology / Q000276:immunology / Q000469:parasitology; D009206:Myocardium / Q000276:immunology; D010920:Placenta / Q000469:parasitology*; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000469:parasitology*; D014349:Trypanosoma cruzi / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification*; D014774:Virulence
D000953:Antigens, Protozoan; D016054:DNA, Protozoan