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P Portales

Publications and source records attributed to P Portales.

14 recordsLinked to original sources
PubMed2003

Rare occurrence of CD30+ circulating cells in patients with cutaneous CD30+ anaplastic large cell lymphoma: a study of nine patients.

BACKGROUND: The presence of a significant percentage of circulating atypical lymphocytes in peripheral blood has already been demonstrated in systemic CD30+ anaplastic large cell lymphoma (ALCL), which implies that a leukaemic component may be present in this subset of lymphomas. However, no similar data are available for the cutaneous counterpart of this particular lymphoproliferation. OBJECTIVES: To assess the presence of atypical cells, CD30+ lymphocytes and of a dominant T-cell clone in peripheral blood in a series of patients with cutaneous CD30+ ALCL. MATERIALS AND METHODS: Nine patients with either primary (four) or secondary (five) cutaneous CD4+ CD30+ ALCL were selected. The percentage of CD30+ CD4+ lymphocytes among peripheral blood mononuclear cells (PBMC) was determined by flow cytometry and the presence of a dominant circulating T-cell clone was assessed by polymerase chain reaction targeting the T-cell receptor gamma chain. A control group composed of apparently healthy individuals was similarly studied at the same time. RESULTS: The mean percentage of CD30+ cells in PBMC was slightly higher in patients than in controls (3.9% vs. 2.7%) but the difference was not statistically significant. Only two patients displayed more than 5% CD30+ cells, both of whom had a minor tumour burden. A dominant circulating T-cell clone was detected in only three cases, including these two latter patients. CONCLUSIONS: The occurrence of a significant percentage of CD30+ CD4+ circulating cells is rare in active cutaneous CD30+ ALCL, either primary or secondary. This percentage is not related to the apparent skin tumour burden but a significant figure appeared to be correlated with the detection of a dominant T-cell clone in peripheral blood. Overall, these data show that, unlike mycosis fungoides, peripheral blood involvement seems infrequent in cutaneous CD30+ ALCL. The hypothesis that a high percentage of CD30+ circulating cells might be related to the presence of a cryptic systemic disease cannot be ruled out.

Adult↗
PubMed2001

CD4 T cell surface CCR5 density as a host factor in HIV-1 disease progression.

OBJECTIVE AND DESIGN: We have recently shown that the number of CCR5 molecules at the surface of peripheral blood CD4 T cells (CCR5 density) correlates with the viral RNA plasma level in HIV-1-infected individuals. As viral load is a strong predictor of outcome in HIV infection, the present study examines the correlation between CCR5 density and HIV-1 disease progression. METHODS: Using a quantitative flow cytometry assay, we measured CCR5 density in HIV-1-infected adults and control healthy volunteers. The CCR5 genotype (presence of a Delta 32 allele) was also determined. RESULTS: CCR5 density was stable over time on non-activated, HLA-DR(-)CD4 T cells of infected individuals. In a study cohort of 25 patients, asymptomatic and non-treated, we observed a correlation between CCR5 density on HLA-DR(-)CD4 T cells and the CD4 T cell slope (P = 0.026), which was independent of the presence or absence of the Delta 32CCR5 deletion. In particular, slow progressors expressed lower CCR5 densities than non-slow progressors (P = 0.004) and non-infected control subjects (P = 0.002). CONCLUSION: These results are compatible with the hypothesis that CCR5 density, which is a key factor of HIV-1 infectability, determines in-vivo HIV production, and thereby the rate of CD4 cell decline. Consequently, CCR5 density quantitation could be a new valuable prognostic tool in HIV-1 infection. Moreover, these data emphasize the therapeutic potential of treatments that reduce functional CCR5 density.

Adult↗
PubMed2000

Low dose antithymocyte globulins in renal transplantation: daily versus intermittent administration based on T-cell monitoring.

BACKGROUND: Despite the long history of use of antithymocyte globulins (ATG) in renal transplantation, ideal doses and duration of ATG administration based on the monitoring of T lymphocytes have yet to be defined. METHODS: Two immunosuppressive regimens based on low-dose rabbit ATG (Thymoglobuline; Imtix-Sang-stat, Lyon, France) were assessed during the first year after transplantation: daily ATG (DATG; n=23) where 50 mg of ATG was given every day and intermittent ATG (IATG; n=16) where similar doses of ATG were given for the first 3 days and then intermittently only if CD3+ T lymphocytes (measured by flow cytometry) were > 10/mm3. Both groups received steroids, azathioprine, and cyclosporine. RESULTS: ATG-induced depletion was similar for peripheral blood lymphocytes and T cells in both groups: it began at day 1 after transplantation, was submaximal at day 3, and reached maximum intensity between days 6 and 8, from which time cell counts progressively increased. However, T-cell depletion was still present at day 20. The total ATG dose per patient (381.5+/-121 vs. 564+/-135 mg/patient) and the mean cumulative daily dose of ATG (0.60+/-0.17 vs. 0.80+/-0.14 mg/kg/day) were significantly lower in the IATG group (P=0.0001 and 0.0006, respectively). The overlap of ATG and cyclosporine treatment was 6.7+/-3 vs. 7.4+/-4.3 days (P=NS), and the mean duration of ATG therapy was 11.3+/-3.2 vs. 11.6+/-2.7 days in the IATG and DATG groups, respectively (P=NS). ATG was given in an average of one dose every 1.6 days in the IATG group compared with one dose daily in the DATG group (P=7 x 10(-7)). There was no significant difference in renal graft function, the number of acute graft rejections, or ATG-related side effects and complications. Despite the daily immunological follow-up, there was a net saving of $760/patient in the cost of treatment in the IATG group. CONCLUSION: IATG had the advantage of a reduction in the dose of ATG and in the cost of treatment, while offering similar T-cell depletion and effective immunosuppression. This approach could be proposed as an induction protocol, particularly for patients with poor graft function in whom cyclosporine introduction has to be delayed or those with increased risk of cytomegalovirus infections or secondary malignancies.

Adult↗
PubMed2000

Decreased expression of Fas (APO-1/CD95) on peripheral blood CD4+ T lymphocytes in cutaneous T-cell lymphomas.

BACKGROUND: The usually protracted and indolent course of cutaneous T-cell lymphoma (CTCL) is consistent with an accumulation of lymphocytes rather than being a true proliferative disorder, perhaps as the result of defective lymphocyte apoptosis. Fas (CD95) is the main signalling membrane molecule involved in postactivation T-lymphocyte apoptosis. OBJECTIVES: To evaluate expression of Fas on circulating CD4+ lymphocytes in patients with CTCL. METHODS: Fas expression on peripheral blood CD4+ T cells in 16 patients with mycosis fungoides (patch and infiltrated plaque stages) and in four patients with Sézary syndrome was compared with that in 25 matched patients with lymphocyte-mediated cutaneous benign inflammatory disorders and in 15 subjects without inflammatory cutaneous diseases. RESULTS: Fas expression on peripheral CD4+ lymphocytes was significantly lower in patients with CTCL compared with subjects with benign inflammatory cutaneous disorders and with healthy donors. CONCLUSIONS: This pattern supports the hypothesis that a defect in T-cell apoptosis may play a part in the pathophysiology of CTCL, perhaps through abnormalities of the Fas/Fas ligand system. Alternatively, this decrease could be the result of the presence of the soluble Fas ligand molecule in the sera of patients with CTCL.

Apoptosis↗
PubMed2000

CD4+ T cell surface CCR5 density as a determining factor of virus load in persons infected with human immunodeficiency virus type 1.

The intensity of expression of the chemokine receptor CCR5 is involved in in vitro cell infectability by human immunodeficiency virus (HIV)-1 R5 isolates. Because CCR5 expression varies among individuals, the hypothesis that this expression could determine virus load in HIV-1-infected persons was tested. The mean number of CCR5 molecules per cell was measured on peripheral blood CD4+ T lymphocytes (CCR5 density) from HIV-1-infected, asymptomatic, nontreated adults. There was a strong correlation between HIV RNA plasma level and CCR5 density (P=.009) that was independent of cell activation and was not due to an HIV-induced CCR5 up-regulation. These data are compatible with the hypothesis that CCR5 density is a key factor governing cell infectability and in vivo virus production and explain the protective effect of the Delta32CCR5 deletion, which results in low CCR5 expression. CCR5 density might be of critical predictive value in HIV infection.

Acquired Immunodeficiency Syndrome↗
PubMed2000

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Journal Article↗
PubMed2000

[Low-dose antithymocyte globulins in kidney transplantation: results of a protocol of intermittent administration].

BACKGROUND: Despite the long history of use of antithymocyte globulins (ATG) in renal transplantation, ideal doses and duration of ATG administration based on the monitoring of T lymphocytes have yet to be defined. METHODS: Two immunosuppressive regimens based on low dose rabbit ATG (thymoglobuline, Imtix-Sangstat, Lyon-France) were assessed during the first year post-transplant: daily ATG (n = 32) where 50 mg of ATG were given every day and intermittent ATG (n = 24) where similar doses of ATG were given for the first three days and then intermittently only if CD3+T lymphocytes (measured by flow cytometry) were > 10/mm3. Both groups received steroids, azathioprine and cyclosporin A (CsA). RESULTS: ATG-induced depletion was similar for PBL and T cells in both groups: it began at day one post-transplant, was submaximal at day 3 and reached maximum intensity between days 6 and 8 from which time cell counts progressively increased. However, T cell depletion was still present at day 20. The total ATG dose per patient (361 +/- 105 vs 556 +/- 119 mg/patient) and the mean cumulative daily dose of ATG (0.60 +/- 0.17 vs 0.80 +/- 0.14 mg/kg/d) were significantly lower in the IATG group (p = 0.0001, and 0.0006 respectively). The overlap of ATG and CsA treatment was 6.7 +/- 3 vs 7.4 +/- 4.3 days (p = ns) and the mean duration of ATG therapy was 12 +/- 3 vs 11 +/- 2.5 days in the IATG and DATG groups respectively (p = ns). ATG were given in an average of one dose every 1.6 days in the IATG group compared to one dose daily in the DATG group (p = 7 x 10(-7). There was no significant difference in renal graft function, the number of acute graft rejections or ATG related side effects and complications. Despite daily immunological follow-up, there was a net saving of 920 $/patient in the cost of treatment in the intermittent ATG group. CONCLUSION: Intermittent ATG had the advantage of a reduction in the dose of ATG and in the cost of treatment while offering similar T cell depletion and effective immunosuppression. This approach could be proposed as an induction protocol, particularly for patients with poor graft function in whom CsA introduction has to be delayed.

Adult↗
PubMed1995

Lethal acute graft-versus-host disease in a liver transplant recipient: relations with cell migration and chimerism.

We report herein the case of a patient who developed fatal acute graft-versus host disease (GvHD) after liver transplantation (LT). GvHD occurred 18 days after LT and was characterized by skin epidermolysis, diarrhea and leucopenia. Skin biopsy showed epidermal dyskeratosis with epithelial necrosis, a lesion consistent with GvHD. Despite immunosuppressive therapy, the patient died within 24 days. In our observation, GvHD occurred although five HLA compatibilities were identified between the donor and the recipient, an apparently favorable and uncommon situation. This case further supports the qualification that LT may be complicated by GvHD and strongly suggests that minor rather than major histocompatibility antigens are the main target of allogenic interactions of GvHD. The involvement of chimerism in GvHD is controversial and requires further investigation.

Cell Movement↗
PubMed1994

Biclonal Sézary syndrome with capillary leak syndrome.

Sézary syndrome is a rare, usually monoclonal proliferation of T lymphoid cells. We report a case of this form of cutaneous T cell lymphoma with highly probable biclonality of neoplastic proliferation. Biclonality in malignant lymphoma is a rare feature, until now generally reported in B cell lymphoma. Its identification by accurate immunological studies could be of importance since one of the two populations can exhibit a less differentiated phenotype requiring a more aggressive therapeutic regimen than usual. The occurrence of anasarca in our patient was probably due to capillary leak syndrome, already discussed in another case of peripheral T cell lymphoma.

Aged↗
PubMed1984

Long-term follow-up of children breast-fed by mothers receiving depot-medroxyprogesterone acetate.

A long-term follow-up study compared development and health of 128 breast-fed children whose mothers had received depot-medroxyprogesterone acetate (depot-MPA) while lactating and 142 control children whose mothers had used mechanical contraceptives or no contraceptives or had undergone sterilization. The children, who were approximately 4-1/2 years old at follow-up, showed no ill effects on their growth and development and health status from exposure to depot-MPA. Depot-MPA-treated mothers lactated significantly longer than controls and also had greater parity than controls. These factors apparently contributed to a difference in weight at follow-up. Compared with the Sempe-Pedron standard, more of the depot-MPA group were underweight and more controls were overweight.

Adult↗
PubMedDate not supplied

[Antigenic specificity of antiplasmodium antibodies in an endemic area: an attempt at correlation with the induction of protective immunity].

Asexual blood-stage antigens from Plasmodium falciparum related to the development of protective immunity in an endemic area were identified by statistical comparison of antigens recognized by adult immune sera with those recognized by non-immune subjects (children). After metabolic labelling of parasites in culture and immunoprecipitation, target antigens of seric antibodies were separated by polyacrylamide gel electrophoresis/SDS and detected by fluorography. Two groups of antigens were thus identified: 1) the major bands, recognized by more than 90% of the sera regardless of the patients' immune status; and 2) the minor bands, less intense on fluorograms. The corresponding antibodies were more frequent in children who had not yet acquired protective immunity than in immune adults. Thus, these minor bands do not appear essential for protection, which might instead be related to the presence of some major antigens, such as 210/196-, 136-, 121- and 80-Kd antigens. These antibodies persist for at least one year, independently of fluctuations in the rate of transmission by Anopheles.

Adult↗