PubMed Health⌕ Search

Biomedical subjects

W P McNulty

Publications and source records attributed to W P McNulty.

At least 19 recordsLinked to original sources
PubMed1986

Distribution of type D retrovirus sequences in tissues of macaques with simian acquired immune deficiency and retroperitoneal fibromatosis.

Horizontally acquired SAIDS retrovirus type 2 (SRV-2), a type D retrovirus related to the Mason-Pfizer monkey virus, has been associated with the simian acquired immunodeficiency syndrome (SAIDS) including retroperitoneal fibromatosis (RF) in several macaque species at two primate research centers. Virus specific gene sequences are present in lymphoid and RF tissues but not in muscle tissue of diseased macaques or in any tissues of uninfected normal monkeys. Serologic and restriction endonuclease mapping techniques have defined unique SRV-2 strains in the Celebes (SRV-2C) and rhesus (SRV-2R) macaques at the Oregon Regional Primate Center, SRV-2 is related to both MPMV and SAIDS type 1 retroviruses and it has no detectable molecular homology with the human AIDS retroviruses.

Acquired Immunodeficiency Syndrome↗
PubMed1986

Neutralizing antibody in Celebes black macaques recovering from infection with simian acquired immunodeficiency syndrome retrovirus type 2.

Neutralizing antibodies that block the ability of simian acquired immunodeficiency syndrome (SAIDS) retrovirus type 2 (SRV-2) to induce syncytium formation in cultures of Raji cells have been found in the serum of nonviremic Celebes black macaques (Macaca nigra). Serum from Celebes macaques that are viremic have little or no neutralizing activity. The neutralizing antibodies were shown to block viral infectivity. The group of monkeys with neutralizing antibodies in their serum exhibited a dramatic improvement in their health from 1982 to 1984. The correlation of neutralizing antibodies with clinical improvement suggests that neutralizing antibodies may play a critical role in limiting the pathogenic effects of SAIDS retrovirus infection and in helping eliminate the infection.

Acquired Immunodeficiency Syndrome↗
PubMed1986

Association of SAIDS/RF-related signs with current or past SAIDS type 2 retrovirus infection in a colony of Celebes black macaques.

The 83 members of the Celebes black macaque (Macaca nigra) colony were screened for viremia with simian acquired immunodeficiency syndrome (SAIDS) type 2 retrovirus and antibodies against the retrovirus. On the basis of this screening, the Celebes colony was divided into four groups: retrovirus-positive/seropositive (virus+/Ab+); retrovirus-negative/seropositive (virus-/Ab+); retrovirus-positive/seronegative (virus+/Ab-); and retrovirus-negative/seronegative (virus-/Ab-). Monkeys in the virus+/Ab+ group displayed more major clinical signs and required medication more times than monkeys in the other groups. In contrast, monkeys in the virus-/Ab- group had fewer health problems than monkeys in the other groups. The five monkeys that had surgically confirmed retroperitoneal fibromatosis (RF), palpable abdominal masses, or both, were in the virus+/Ab+ group. Some of the monkeys in groups with current or past retrovirus infection were well clinically. There were no statistically significant differences in the mitogen reactivities of mononuclear cells obtained from monkeys of the different groups.

Acquired Immunodeficiency Syndrome↗
PubMed1986

Relationship of mitogen reactivity to type D retrovirus infection in Celebes black macaques (Macaca nigra).

The Celebes black macaque (Macaca nigra) colony at the Oregon Regional Primate Research Center has a high incidence of an immunodeficiency syndrome characterized by recurrent diarrhea and the development of retroperitoneal fibromatosis (RF). We have examined the relationship of type D viral infection to the immunodeficiency syndrome by surveying the colony for viral infection and for mitogen reactivity. Type D virus-positive monkeys (28% of the colony) have a higher prevalence of diarrhea, splenomegaly, lymphadenopathy and weight loss than do virus-negative monkeys, and RF has been found to occur only in virus-positive animals. Comparison of the concanavalin A (con-A) and phytohemagglutinin reactivities of the virus-positive and -negative populations has revealed no significant difference. However, within the virus-positive population, those with RF have reduced con-A reactivity and there are both high and low mitogen responders in the groups lacking RF. Thirty-two percent of the virus-positive monkeys are free of clinical symptoms, 40% have clinical symptoms but no RF, and 27% have clinical symptoms and RF. Five of the six monkeys with RF are older than the RF-free monkeys but monkeys are susceptible to type D retrovirus infection regardless of age or sex. The progressive nature of this immunodeficiency syndrome, its broad age range, and the probability that the etiological agent is also a type D retrovirus and the similarity of RF to Kaposi's sarcoma make this a potentially useful model for human AIDS.

Acquired Immunodeficiency Syndrome↗
PubMed1985

Virus-associated deficiencies in the mitogen reactivity in celebes black macaques (Macaca nigra).

Celebes black macaques (Macaca nigra) with a history of diabetes mellitus, recurrent bacterial and protozoal infections, diarrhea, anemia, weight loss, anorexia, and a high mortality were studied to determine their immune status. Two groups of monkeys, healthy and unhealthy, were formed on the basis of a clinical assessment. The proliferative response and the pokeweed-mitogen-induced polyclonal IgG response of peripheral blood mononuclear cells of unhealthy monkeys were significantly less than the responses of healthy monkeys. The percentage of HLA-DR+ cells varied greatly in unhealthy monkeys. The OKT4/OKT8 ratios of unhealthy monkeys were generally greater than the ratios of healthy monkeys. Unhealthy monkeys usually had smaller percentages of OKT8+ cells than did healthy monkeys. The two groups of monkeys were examined for the presence of a syncytial forming retrovirus by a coculture assay involving Raji cells, a human B lymphoblastoid cell line. A type D retrovirus was detected in the unhealthy group but not in the healthy group. Retroperitoneal fibromatosis was detected in several monkeys in the unhealthy group.

Acquired Immunodeficiency Syndrome↗
PubMed1985

Toxicity and fetotoxicity of TCDD, TCDF and PCB isomers in rhesus macaques (Macaca mulatta).

In rhesus macaques (Macaca mulatta), consumption of food containing commercial polychlorinated biphenyl (PCB) mixtures, some pure polychlorobiphenyl congeners, 2,3,7,8- tetrachlorodibenzo-p-dioxin (TCDD), and 2,3,7,8-tetrachlorodibenzofuran (TCDF) caused the same clinical toxic manifestations and histopathologic lesions, although the potencies of the toxicants covered a range of five orders of magnitude. Recovery from poisoning by 3,4,3',4'-tetrachlorobiphenyl (34TCB) or TCDF was rapid, whereas recovery from poisoning by Aroclor 1242, 3,4,5,3', 4', 5'-hexachlorobiphenyl (345HCB) or TCDD was protracted, if it occurred at all. 34TCB did not appreciably accumulate in body fat, but the level of 345HCB in fat rose steadily during ingestion. In one monkey, 25% of TCDD stored in fat after a single dose was still present after 2 years. Among the symmetrical tetra-and hexachlorobiphenyl isomers tested, subacute oral toxicity could be demonstrated only for those without ortho chlorine substitutions. 34TCB and 345HCB were toxic at dietary levels of less than 1 ppm, but ingestion of food containing 2,5,2',5'- tetrachlorobiphenyl at 5 ppm, or 2,4,5,2',4',5'-, 2,4,6,2',4',6'-, or 2,3,6,2',3',6'-hexachlorobiphenyl at 15 or 65 ppm, caused no discernible deleterious effects. The principal demonstrable histopathological lesions, bone marrow excepted, were metaplasias in some specialized epithelial structures, such as sebaceous glands, nail beds, gastric mucosa, ameloblast, and thymic corpuscles. These changes were interpreted as toxicant-induced, reversible redirection of differentiation. This aberration was wholly reversible. TCDD and 34TCB caused abortions when given in one or a few oral doses early in pregnancy. At the total doses used (1 or 5 micrograms/kg of body weight for TCDD, 3 or 0.6 mg/kg of body weight for 34TCB), maternal toxicity was frequently apparent subsequent to the abortion.

Abortion, Spontaneous↗
PubMed1984

Gastric epithelial cell proliferation in monkeys fed 3,4,3',4'-tetrachlorobiphenyl.

Rhesus monkeys (Macaca mulatta) fed diets containing 1 or 3 mg/kg of 3,4,3',4'-tetrachlorobiphenyl (3,4-TCB), became moribund after 7-14 weeks. In the body of the stomach the mucosa was thick and cystic gastric glands penetrated the muscularis mucosae. The zymogenic and parietal cells were replaced by or converted into mucus-secreting cells. Autoradiographs of animals labelled with [3H]thymidine showed that in control monkeys gastric epithelial cell proliferation was limited to the isthmus and neck regions of the glands throughout the stomach. In the 3,4-TCB-fed animals most DNA synthesis also occurred in these regions, but [3H]thymidine labelled cells were also seen in the bases of the glands. The labelling indices were not elevated, and therefore the submucosal glands and cysts in this lesion may develop by a failure of the newly formed, downward migrating cells to differentiate and lose their proliferative capacity.

Animals↗
PubMed1982

Diet-induced systemic lupus erythematosus (SLE) in primates.

Ten adult, female cynomolgus macaques were randomly assigned to two equal groups: (1) semipurified diet (SPD); and (2) SPD with 45% ground alfalfa seed (AS). Both groups were studied at monthly intervals after 5 mo on their respective diets. Control animals had a mean hematocrit (Hct) of 43 +/- 2%, negative antiglobulin (AG), antinuclear antibody (ANA) and LE cell tests. Mean values for C3 and C4 were 309 +/- 47 mg/dl and 35 +/- 7 mg/dl, respectively. Mean serum binding to radiolabeled double stranded deoxyribonucleic acid (dsDNA) was 1.9 +/- 0.2%. Three of five animals fed AS developed signs of an SLE-like illness characterized by AG-positive anemia (lowest Hct 30%), positive ANA (highest titer greater than 1:15, 360; rim pattern) and elevated anti-dsDNA binding (highest 96%) with variable degrees of hypocomplementemia. One animal had granular deposition of immunoglobulin and complement at the dermal-epidermal junction of clinically normal skin the presence of immune complex-induced glomerulonephritis.

Animals↗
PubMed1981

Cholesterol and bile acid balance in Macaca fascicularis. Effects of alfalfa saponins.

We determine the effects of alfalfa top saponins on cholesterol and bile acid balance in eight cynomolgus macaques (Macaca fascicularis). The monkeys ate semipurified food containing cholesterol with or without added saponins. The saponins decreased cholesterolemia without changing the levels of high density lipoprotein-cholesterol; hence, they reduced the total cholesterol/high density lipoprotein-cholesterol ratio. Furthermore, they decreased intestinal absorption of cholesterol, increased fecal excretion of endogenous and exogenous neutral steroids and bile acids, and decreased the percent distribution of fecal deoxycholic and lithocholic acids. The fecal excretion of fat was also slightly increased, but steatorrhea did not occur. We saw no signs of toxicity in the monkeys after 6 or 8 wk of saponin ingestion. The data suggest that alfalfa top saponins may be of use in the treatment of patients with hypercholesterolemia, but long-term studies on possible toxicity are needed before this therapy can be recommended for humans.

Animals↗
PubMed1979

Polychlorinated biphenyl-induced morphologic changes in the gastric mucosa of the rhesus monkey.

The early morphologic events in polychlorinated biphenyl-induced lesions of the gastric mucosa of immature male rhesus monkeys (Macaca mulatta) were studied in serial biopsies taken during consumption of diets containing 3, 10, 30, and 100 mg. per kg. (p.p.m.) of Aroclor 1242. The severity of the lesions correlated directly with both the duration and the level of exposure. The first changes were seen after ingestion of 30 and 100 mg. per kg. for 2 weeks; changes were not seen until 10 weeks at 3 and 10 mg. per kg. The principal effect was an apparent arrest of the differentiation of generative cells of the isthmus and neck regions into parietal and zymogenic (chief) cells. Mature parietal and zymogenic cells were found only in the bases of the glands, where the oldest cells are normally found, and these showed signs of injury including dilation of the rough endoplasmic reticulum in zymogenic cells, irregularity of the mitochondria in parietal cells and irregular luminal membranes, and an increase in the number of large autophagic vesicles in both cell types.

Animals↗
PubMed1978

Effect of alfalfa meal on shrinkage (regression) of atherosclerotic plaques during cholesterol feeding in monkeys.

A semipurified diet containing 1.2 mg of cholesterol/Cal was fed to cynomolgus monkeys (Macaca fascicularis). At the end of 6 months, a group of 18 animals was killed for evaluation of atherosclerosis in the aorta and the coronary arteries. The remaining monkeys were assigned to three groups of 18 animals each and fed, during the following 18 months, semipurified diets containing 0.34 mg of cholesterol/Cal with or without alfalfa meal, or a diet consisting entirely of Monkey Chow. a decrease in cholesterolemia and plasma phospholipid levels, normalization in the distribution of plasma lipoproteins, and reduction in the extent of aortic and coronary atherosclerosis were observed in monkeys fed the semipurified diet containing alfalfa, although the intake of cholesterol remained as high as in the usual American diet. These changes, also observed in monkeys fed a chow diet almost devoid of cholesterol, suggest that alfalfa counteracts the atherogenic effect of dietary cholesterol.

Animals↗