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Biomedical subjects

J L Perrotto

Publications and source records attributed to J L Perrotto.

7 recordsLinked to original sources
PubMed1977

Effect of vitamin A on the systemic and local antibody responses to intragastrically administered bovine serum albumin.

The effects of vitamin A on the immune response to bovine serum albumin (BSA) were studied in adult mice. Treatment with vitamin A by the intragastric or parenteral routes markedly increased the local as well as the systemic antibody response to different concentrations of the antigen (BSA). In contrast, in animals given BSA alone, antigen concentrations above a certain dose resulted in a decreased or even absent anti-BSA response. These studies suggest that vitamin A may be an appropriate adjuvant in oral immunization.

Adjuvants, Immunologic↗
PubMed1976

Circulating immune complexes and complement sequence activation in infectious mononucleosis.

The role of immune complex formation was investigated in a patient with infectious mononucleosis complicated by an urticarial rash. Circulating cryoprotein immune complexes were identified during the urticarial phase of the illness, and disappeared during recovery. These complexes were composed of immunoglobulins G (IgG), M (IgM) and A (IgA), complement components C3, C4 and C5, Epstein-Barr (EB) virus capsid antibody and particles resembling EB virus. The IgG subtypes identified in the immune complexes were the complement fixing IgG-1, IgG-2 and IgG-3. The C3 activator of the properdin complex was detected in serum obtained during that acute phase but not after recovery. Thus, the transient appearance of circulating complement-fixing immune complexes was associated in this patient with activation of both classic and alternate complement pathways. The findings suggest that these complexes may be involved in the rash associated with infectious mononucleosis.

Adult↗
PubMed1976

Intestinal lipoprotein formation: effect of cholchicine.

The possibility that microtubules might be involved in intestinal lipoprotein formation or secretion was studied by determining the effect of colchicine, a known microtubule inhibitor, on intestinal lipid absorption. The effect of colchicine (0.5 mg per 100 g) in the lymphatic absorption of [14C]oleic acid was studied in rats with indwelling mesenteric lymph cannulas. Colchicine-treated animals showed a marked delay as well as a decrease in the lympatic absorption of [14C]oleic acid. Chylomicrons from colchicine-treated animals showed no difference in apoprotein content when examined on sodium dodecyl sulfate polyacrylamide gels. Micellar lipid absorption was next studied from in situ jejunal loops in animals pretreated with colchicine. Colchicine administration was associated with a 3-fold increase in residual mucosal lipid when compared with controls. Thin layer chromatography of residual lipid demonstrated that residual lipid was largely present as triglyceride, suggesting that the impairment in lipid transport induced by colchicine was at a site distal to triglyceride resynthesis. Electron microscopic examination of intestine from colchicine-treated animals revealed that most residual lipid was present within the endoplasmic reticulum and Golgi in numerous particles the size of chylomicrons (0.2 to 0.4 mu). These results suggest that the impairment in lipid transport induced by colchicine is distal and, in part, may represent an "exit block". These results suggest a possible role for microtubules in intestinal lipid transport. However, further studies are required to demonstrate directly the participation of microtubules in chylomicron secretion.

Animals↗
PubMed1975

Serum lysozyme in Crohn's disease and ulcerative colitis.

Serum lysozyme (muramidase) concentrations were determined in patients with different types of inflammatory bowel disease and in normal subjects. The mean (plus or minus S.E.M.) lysozyme concentration for each group was as follows: controls, 8.8 plus or minus 0.3, ulcerative colitis, 9.3 plus or minus 0.6, Crohn's disease, 26.3 plus or minus 1.4. a and bacterial and nonbacterial enteritis, 8.9 plus or minus 0.7 mug per milliliter. Thus, mean enzyme levels were significantly greater in Crohn's disease than in ulcerative colitis (p smaller than 0.001), bacterial and nonbacterial enteritis (p smaller than 0.001) and healthy volunteers (p smaller than 0.001). The elevation of serum lysozyme in Crohn's disease may be related to tissue macrophages because no correlation was found between either the serum lysozyme concentration and the white-cell counts or the absolute numbers of circulating granulocytes or monocytes. Our findings suggest that serum lysozyme may be useful in the differential diagnosis of Crohn's disease from other types of bowel inflammation.

Adolescent↗
PubMed1975

Cell-mediated immunity in acute and chronic hepatitis.

Peripheral lymphocytes from patients with hepatitis-B surface antigen (HBsAg)-positive and -negative acute hepatitis (AH), chronic active hepatitis (CAH), chronic persistent hepatitis (CPH), and normal controls were tested for in vitro cytotoxicity and blast transformation. Cytotoxicity was measured by chrominum (21Cr) release into the medium from 51Cr-labeled Chang liver cells after incubation for 6 h with peripheral lymphocytes at a lymphocyte target cell ratio of 200:1. Concomitant 72-h incubation studies were performed to assess thymus cell-dependent (T) lymphocyte function as measured by conccanavalin A (Con A)- stimulated incorporation of tritiated thymidine (blast transformation) and by cytotoxicity. It was found that (a) lymphocytes from patients with AH are cytotoxic to Chang liver cells compared to controls (P less than 0.001); (b) lymphocytes from patients with acute and chronic hepatitis are less cytotoxic when incubated with autologous and homologous HB2Ag-positive and -negative AH, CAH, and CPH are as cytotoxic as normal controls when stimulated with a nonspecific mitogen such as Con A; and (d) lymphocytes from patients with CAH while on prednisone therapy showed marked depression of cytotoxicity when stimulated with Con A. Thus these studies show that patients with AH have circulating T lymphocytes which are capable of causing the destruction of Chang liver cells. There is no defect in T-cell function as measured by Con A-stimulated cytotoxicity. There is a serum factor (s) in patients with acute and chronic hepatitis which inhibits spontaneous and induced lymphocyte cytotoxicity and blast transformation. Finally, prednisone treatment appears to inhibit lymphocyte cytotoxicity in patients with CAH.

Acute Disease↗
PubMed1975

Serum lysozyme in Crohn's disease. A useful index of disease activity.

Serum lysozyme concentrations were determined in patients with clinically active and inactive Crohn's disease as well as in healthy volunteers. The mean serum lysozyme concentrations (+/- SE) for each group were as follows: controls, 8.8 +/- 0.4; active Crohn's disease, 20.8 +/- 0.8; and inactive Crohn's disease, 10.4 +/- 0.7 mug per ml. The mean lysozyme level was significantly greater in active Crohn's disease as compared to normal subjects (P less than 0.001) and patients with inactive disease (P less than 0.001). Moreover, in patients with clinically severe Crohn's disease there seems to be a trend toward greater lysozyme levels, as opposed to those with mild to moderately active disease. In patients followed serially during the course of their disease, serum lysozyme levels increased with exacerbations of the illness and decreased with clinical improvement. These findings suggest that the serum lysozyme concentrations may serve as a useful index of the activity of Crohn's disease and aid in monitoring the clinical course of such patients.

Crohn Disease↗