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D V Coleman

Publications and source records attributed to D V Coleman.

At least 91 records · Page 5Linked to original sources
PubMed1983

Human polyomavirus in pregnancy. A model for the study of defence mechanisms to virus reactivation.

We have carried out a longitudinal study of human polyomavirus infection in 71 pregnant women and correlated the virological findings with changes in the defence system in the same patients. As reactivation of human polyomaviruses generally occurred late in the second trimester it was possible to distinguish between the immunological changes which preceded the onset of reactivation and those which were secondary to the infection. Evidence of reactivation was detected in 26 women; all had high or rising antibody titres against BK or JC virus, but only five of these developed viruria. A positive correlation was observed between a high monocyte count in early pregnancy and subsequent virus reactivation. The virus excretors had significantly lower neutrophil counts than the women who had no evidence of virus reactivation. In contrast, women with serological evidence of virus activity but no viruria has significantly higher neutrophil counts than the non-activators. They also had stronger lymphocyte responses to PHA than the virus excretors. Virus activators were found to have a significant lymphopenia in the third trimester compared to the non-activators. High antibody levels did not appear to inhibit virus excretion. These findings suggest that monocytosis may predispose to reactivation of human polyomaviruses in pregnancy. On the other hand, ability to contain the virus once it has been activated, was associated with neutrophilia, and relatively vigorous in vitro reactivity of lymphocytes to PHA. Persistent lymphopenia was probably secondary to virus reactivation. The model on which this study is based could be adapted to investigate the causes of reactivation of other viruses. It may also help to identify risk factors in patients who are particularly susceptible to infection with opportunistic viruses.

Animals↗
PubMed1983

A longitudinal study of leucocyte blood counts and lymphocyte responses in pregnancy: a marked early increase of monocyte-lymphocyte ratio.

Seventy-seven pregnant women were studied repeatedly from the first trimester until 4 weeks after delivery. Neutrophil count was increased but constant in all stages of pregnancy. In contrast, there was a marked increase in monocyte numbers in the first and early second trimester, followed by a gradual decrease towards normal before term. A progressive decrease in total lymphocyte count was observed up to 25-28 weeks, when it increased again, although not reaching the non-pregnant level before term. These fluctuations in monocyte and lymphocyte numbers have not been described before and could explain contradictory findings of previous studies. They may also be important in relation to the mechanisms which prevent rejection of the fetal allograft. Absolute T cell counts were not significantly decreased, but a striking reduction was observed in B cell numbers in early pregnancy. Lymphocyte response to T cell mitogens was decreased throughout pregnancy. It is concluded that immunological studies of pregnancy must take account of the dynamic nature of this condition.

B-Lymphocytes↗
PubMed1982

Epithelial Membrane Antigen. Its use in the cytodiagnosis of malignancy in serous effusions.

The cytological distinction between reactive mesothelial and malignant cells frequently causes problems for the diagnostic cytologist. In order to determine whether an immunocytochemical method might help resolve these difficult cases, we have stained smears from 309 serous effusions from 246 patients for the Epithelial Membrane Antigen (EMA). The EMA staining was classified as strong, weak or negative. Carcinoma cells (as diagnosed by conventional cytology) stained strongly for EMA in 63 of the 116 positive smears (54%). Five out of 15 (33%) of cytologically suspicious smears from patients with known carcinomas gave a strong EMA stain. Of particular interest were three effusions in which malignant cells were not identified in conventionally stained smears and in which a small number of EMA positive cells were identified. The EMA positive cells were subsequently restained by the Papanicolaou method and identified as malignant on retrospective morphological examination.

Antigens, Surface↗
PubMed1982

Cytological diagnosis of virus-infected cells in cervical smears. Value in gynecologic and obstetric practice.

Herpes simplex virus is a common cause of infection of the female genital tract. The infection can be diagnosed by the cytopathologist from the appearances of multinucleate giant cells in Papanicolaou smears. The cytological diagnosis of this infection is of value to the gynecologist in identifying subclinical infection and in confirming clinically suspicious disease. The validity of the cytological diagnosis can be established by virus isolation or electron microscopy. Although other infections of the female genital tract such as wart virus infection, cytomegalovirus infection, and chlamydial infection can be detected by cytological methods, the reliability of the cytological approach has yet to be established. Nevertheless, cytology has provided a powerful stimulus for research into the prevalence of wart virus infection of the cervix, which has been shown to be much more common than was previously supposed, and may be a factor in cervical carcinogenesis. Cytological examination of smears of urinary sediment has proven to be a reliable method of detecting human polyomavirus excretion in pregnancy. Active infection of the urinary tract occurs in 3.2% of pregnant women who represent an "at risk group" with altered immunological function.

Animals↗
PubMed1981

Chromosomal abnormalities in ascitic fluid from patients with alcoholic cirrhosis.

Cytology and cytogenetics were used to study ascitic fluid obtained from five patients with alcoholic cirrhosis. Cytological examination showed that all fluids contained numerous mesothelial cells and some leucocytes. Cytogenetic analysis showed abnormal karyotypes in cultured cells from all five patients and in uncultured cells from three. A consistent abnormality was the presence of spreads with over 70 chromosomes. Clones of abnormal cells, with marker chromosomes, pseudodiploidy, or aneuploidy, in an effusion are characteristic of malignancy; the abnormal karyotypes fulfilled these criteria. This finding of abnormal karyotypes indicates that transformation of the mesothelium can occur in vivo, and such a reaction may be a reflection of the mutagenic effect of alcohol.

Aged↗
PubMed1981

Trophoblast sampling in early pregnancy. Culture of rapidly dividing cells from immature placental villi.

Trophoblast was obtained by ordinary suction curettage and by transcervical aspiration with a medicut cannula from women having a therapeutic abortion in the first trimester of pregnancy. The decidual tissue which is invariably attached to early placental villi was separated and pure cultures obtained from the trophoblast layers and from the mesenchymal core of placental villi. Cytotrophoblast had a very limited life span in tissue culture, whereas mesenchymal cells grew rapidly and could be used for antenatal diagnosis.

Cell Division↗
PubMed1981

Use of antisera to epithelial membrane antigen for the cytodiagnosis of malignancy in serous effusions.

A new human antigen, designated epithelial membrane antigen (EMA), has recently been described on surface membranes of a wide variety of normal epithelium but not on connective tissue cells. The antigen is only weakly expressed on normal or reactive mesothelium. Increased expression of the antigen has been observed in most neoplasms of epithelial origin and in malignant mesothelioma. We have investigated the possibility of using this difference in the expression of the antigen to distinguish between mesothelial cells and malignant cells in cytological smears of serous effusions. This distinction cannot always be made on morphological grounds alone and problems of differential diagnosis are encountered in about 15% of all specimens of serous effusions sent for cytological examination. Using antisera to EMA we have applied an indirect immunoalkaline phosphatase technique to alcohol-fixed smears prepared from serous effusions and have found that intense staining of the antigen is confined to effusions from patients in whom there is either clinical or cytological evidence of malignancy. The technique proved to be especially useful in cytologically equivocal cases, where there were problems of differential diagnosis.

Antigens, Surface↗
PubMed1981

Occurrence of IgM antibodies against BK and JC polyomaviruses during pregnancy.

In a serological survey of 430 pregnant women 45 had high or rising titres of BK-virus haemagglutination-inhibiting antibodies. The presence of BK-virus-specific IgM was confirmed in 10 of these women. No BK-virus-specific IgM was detected in the samples of cord blood from the babies born to these women. The sera from 40 women known to be excreting inclusion-bearing cells during pregnancy were tested for the presence of BK-virus and JC-virus-specific IgM and IgG. The presence of BK-virus-specific IgM was confirmed in three cases and JC-virus-specific IgM in seven cases. Specific IgM persisted for several months in some pregnant women. No Bk-virus-specific IgM was detected in any of the samples of cord blood from the babies born to these women with evidence of polyomavirus infection. No JC-virus-specific IgM was detected in 36 out of 37 of the cord bloods; however, in one it is possible that minute amounts of JC-virus-specific IgM were present.

Animals↗
PubMed1980

Activation of human polyomavirus infection-detection by cytologic technics.

Human polyomaviruses produce characteristic large basophilic nuclear inclusions in urothelial cells. Cytologic screening of urinary sediment for inclusion-bearing cells permits the identification of persons who are actively excreting these viruses. The human polyomavirus-induced changes may be differentiated from changes induced by other viruses and from cancer by transmission electron microscopy of infected cells. Cytologic evidence of virus infection was detected in five of 37 cancer patients receiving various treatments, two of whom were also diabetic, and in two of 84 adult patients who had diabetes mellitus. The monitoring of 3,648 urine samples sent for routine cytologic examination revealed 12 additional patients to have cytologic changes of human polyomavirus infection. Electron microscopy confirmed the presence of polyomavirus particles in seven of the 19 cytologically positive specimens. Previous reports of human polyomavirus excretion have been confined to describing patients whose immunity may have been impaired by drug therapy, congenital disease, or pregnancy. This study indicates that cytologic evidence of active human polyomavirus infection may be found among patients receiving various treatments for a number of medical disorders not usually associated with immunologic defects. Further studies to identify factors concerned in the reactivation of human polyomavirus are indicated.

Adult↗
PubMed1980

A prospective study of human polyomavirus infection in pregnancy.

Urine samples from 1,235 pregnant women were examined by light microscopy for cytologic evidence of virus infection. Smears of urine sediment from 40 women (3.2%) were observed to contain inclusion-bearing cells; polyomavirus infection was confirmed by virologic methods in 24 (60%). A polyomavirus was isolated from 12 women. Five isolates were identified as JC virus and one as BK virus. Another isolate designated AS virus appeared to be unique. Serologic studies on the 40 women were consistent with a high frequency of reactivation of JC virus, and virus excretion was related to gestation. The evidence suggests that selective excretion of JC virus may occur in pregnancy. Among 390 pregnant women without inclusion-bearing cells in their urine, 78 (20%) had a high or rising titer of serum antibody to JC or BK virus or both, a result suggesting virus reactivation, but virus excretion was not detected. In contrast to other reports, no evidence was found for transmission of BK virus to the fetus.

Animals↗
PubMed1979

Cytological diagnosis of virus-infected cells in Papanicolaou smears and its application in clinical practice.

The cytopathic changes of herpes simplex virus, varicella-zoster virus, the human polyomaviruses, and the trachoma agent can be recognised in smears prepared from a wide variety of specimens. The morphology of virus-infected cells is described, and the clinical value of these observations is discussed. Cytological diagnosis offers a rapid and convenient method of detecting infection with these viruses which can be confirmed by conventional virological method while the patient is still in the acute stages of the disease. Confirmation can also be made retrospectively by reprocessing cells, identified in the Papanicolaou smear, for electron microscopy. Screening for virus-infected cells in cytological smears is a technique that can be developed in any pathology laboratory prepared to provide a comprehensive cytology service, and it is proving to be a useful tool in clinical diagnosis and applied research.

Adult↗
PubMed1979

Tissue typing amniotic fluid cells: potential use for detection of contaminating maternal cells.

The presence of contaminating maternal cells in amniotic fluid is an important, though infrequent, cause of error in karyotyping the fetus. A method of detecting contaminating maternal cells in amniocentesis specimens by determining the HLA phenotype of the cells of amniotic fluid and the mother is described. Tissue typing of 15 amniocentesis specimens was performed, and in 14 cases the fetal origin of the cells was established. In one case, the results of tissue typing suggested maternal cell contamination, though this had not been suspected from chromosome studies of the amniotic fluid cell cultures. Other possible uses for tissue typing of amniotic fluid specimens for prenatal diagnosis are also described.

Amniotic Fluid↗