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Biomedical subjects

N J Gill

Publications and source records attributed to N J Gill.

11 recordsLinked to original sources
PubMed1989

Effect of silica treatment on histopathology of intestinal & hepatic amoebiasis in murine model.

Histopathological changes in intestinal and hepatic amoebiasis were studied in Swiss albine mice with and without silica pretreatment. The intestinal infection rate was higher in silica treated mice (83%) as compared to non-silica treated mice (33%). Histologically all the silica treated mice had caecal ulceration which tended to spread across the muscularis propria into the serosal layer. The hepatic lesions were observed grossly in 100 and 60 per cent mice with and without silica treatment, respectively. However, the liver lesions in the silica treated mice were more severe, leading to satellite abscesses and in some cases the capsule ruptured leading to adhesions to the diaphragm and peritoneum. Histologically, the blockade of histiocytes with silica resulted in mainly a neutrophilic damage which was extensive and widespread. It also destroyed the amoeba and led to abundant fibrosis. In the non-silica group the damage was slow and devoid of neutrophils with quicker healing and lack of fibrosis resembling human hepatic lesions.

Animals↗
PubMed1985

Lymphocyte subpopulations transformation studies in an experimental model of intestinal and hepatic amoebiasis.

The lymphocyte subpopulations in peripheral blood and blast transformation were studied on days 0, 3, 7, 11, 15, 20 and 35 after infection in progesterone-treated guinea-pigs which had been experimentally infected with Entamoeba histolytica by intracaecal inoculation. In animals with intestinal infection, lowered T cell numbers and blast transformation were seen during the acute phase with a subsequent tendency to recover. In guinea-pigs with hepatic amoebiasis, both these parameters were significantly depressed throughout the period of study with no tendency to recovery. In progesterone-treated and sham-operated animals, a less marked depression of T cells, was observed. The B cell population did not vary greatly in either group. This study has thus shown that in hepatic amoebiasis there is highly significant depression in both number and function of T cells in comparison to intestinal amoebiasis.

Animals↗
PubMed1985

Histopathology of hepatic amoebiasis in guinea-pigs infected through intracaecal and intramesenteric routes.

The comparative histopathological details of amoebic liver abscess were studied following intracaecal and intramesenteric inoculation of Entamoeba histolytica into guinea-pigs. The histological changes of amoebic liver abscess formed via the former route were similar to those seen in man. These consisted of a central necrotic area with few lymphomononuclear cells and E. histolytica trophozoites at the periphery of the lesion. The amoebic liver abscess formed via the intramesenteric route, however, differed from that formed by intracaecal inoculation in three ways: (i) in having an intense inflammatory reaction, (ii) healing of the abscess by fibrosis and (iii) exhibiting a giant cell reaction.

Animals↗
PubMed1984

Histological evolution of caecal lesions in experimental amoebiasis.

Histopathological studies in guinea-pigs infected intracaecally with Entamoeba histolytica were carried out longitudinally on days 3, 7, 11, 15, 20 and 35 after infection. Three characteristic modes of development of caecal lesions were observed. These in order of their prevalence were the classical inflammatory cellular infiltration, lymphoid hypertrophy and necrotizing colitis. Occasional amoeboma formation was observed in progesterone-treated animals. This is the first time that histological lesions which mimic the human intestinal amoebiasis have been described in the experimental animal.

Animals↗
PubMed1983

Progesterone-induced amoebic liver abscess in guinea-pigs--a new model.

An experimental model of hepatic amoebiasis in guinea-pigs, simulating the natural infection in man, induced by progesterone following intracaecal inoculation of Entamoeba histolytica has been developed. On Day 3 after infection, 60% of the animals developed amoebic liver abscess, but on Days 7, 11, 15, 20 and 35 after infection liver involvement was recorded in all the animals. No animal in the control group developed hepatic amoebiasis. Severity and frequency of caecal lesions was greater in the control groups than in the experimental group receiving progesterone injections. The antiamoebic antibody levels were slightly higher in the experimental group as compared to the control group.

Animals↗
PubMed1981

Kinetics of lymphocyte subpopulations and their functions in cases of amoebic liver abscess.

This study shows the relationship between lymphocyte subpopulations and their response to non-specific stimulant phytohaemagglutinin (PHA) and specific stimulant (amoebic antigen) in cases of amoebic liver abscess in relation to the duration of disease, based on the first appearance of symptoms and/or signs, 26 patients with amoebic liver abscess and 20 normal, healthy controls were studied. Five of the patients gave a history of alcohol intake for the last 10 to 15 years. Eight had a solitary abscess and five had multiple abscesses, as seen on liver scan. No change in the B cell count was noticed in any of the patients. Depression of the T cell number and function was noticed from two weeks onwards. A history of alcohol intake made no difference. Cases with multiple liver abscesses were more immunologically depressed than were those with a solitary abscess.

Alcoholism↗