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Biomedical subjects

E Pontali

Publications and source records attributed to E Pontali.

10 recordsLinked to original sources
PubMed2003

Pharmacokinetics and pharmacodynamics of nelfinavir administered twice or thrice daily to human immunodeficiency virus type 1-infected children.

We studied the pharmacokinetics and pharmacodynamics of nelfinavir administered 2 or 3 times per day to human immunodeficiency virus type 1 (HIV-1)-infected children receiving highly active antiretroviral therapy containing nelfinavir. The geometric mean trough concentrations of nelfinavir for the thrice- and twice-daily regimens were 1.55 mg/L and 1.11 mg/L, respectively (P=not significant). Nelfinavir concentrations did not correlate with total daily dose, dose per kilogram of weight, age, weight, previous protease inhibitor (PI) experience, or CD4(+) cell percentage. In the 25 PI-naive children, the virus load reductions at 24 weeks of treatment with the twice- and thrice-daily regimens were comparable. A significantly higher percentage of children in the twice-daily group had a trough concentration of nelfinavir of less than the inhibitory concentration of 95% (P=.042). The decrease in the virus load at 24 weeks of treatment was not correlated with the trough concentration of nelfinavir. The variability of trough concentrations was extremely high, particularly among recipients of the twice-daily regimen, resulting in a higher number of patients with subinhibitory concentrations of nelfinavir in this group.

Antiretroviral Therapy, Highly Active↗
PubMed2002

Preservation of clonal heterogeneity of the Pneumocystis carinii-specific CD4 T cell repertoire in HIV infected, asymptomatic individuals.

The loss of CD4 lymphocytes in HIV disease associates with opportunistic infections. Since diverse CD4 T cell clones respond to an opportunistic pathogen, we asked whether CD4 depletion deletes selected clones in the repertoire (vertical depletion) or it affects all clones by reducing the cell number in each progeny without affecting the overall number of clones (horizontal depletion). Understanding this point may help explain the mode of CD4 depletion and the mode of immunoreconstitution after therapy. Therefore we examined the CD4 T cell repertoire specific for Pneumocystis carinii, a relevant opportunistic pathogen in AIDS, in HIV-infected, asymptomatic individuals. We identified two patients of 36 asymptomatics for lack of proliferation to P. carinii, suggesting selective depletion of specific CD4 cells. To investigate clonal heterogeneity of P. carinii-responsive CD4 lymphocytes, specific CD4 T cell lines were generated and studied by TCR BV gene family usage and CDR3 length analysis (spectratyping). Clonal heterogeneity was similar in antigen-specific CD4 lines generated from P. carinii non-responding HIV seropositives and from controls. Thus, despite undetectable response to the pathogen, residual specific cells probably prevent overt infection and, when expanded in vitro, exhibit a clonal diversity similar to normal controls. These findings suggest a horizontal, rather than vertical, depletion in these asymptomatic patients.

AIDS-Related Opportunistic Infections↗
PubMed2002

The relationship between ritonavir plasma trough concentration and virological and immunological response in HIV-infected children.

BACKGROUND: We studied a number of factors, including ritonavir plasma levels, and their capability of predicting response to therapy with ritonavir (RTV). METHODS: Eleven HIV-positive children, nucleoside reverse transcriptase inhibitor (NRTI)-experienced, protease inhibitor (PI) naive, receiving RTV in combination with two NRTIs were enrolled in the study. Demographic parameters were: median age (range) 10 (2-13) years, weight 26 (10-38) kg, body surface area (BSA) 0.93 (0.47-1.21) m(2). Baseline values of CD4, percent CD4 and viral load were 137 (2-1390) cells/microL, 9.5 (0.4-32.4)%, and 5.15 (4.30-6.18) log10 copies/mL, respectively. The dose of RTV was 318 (266-409) mg/m(2) twice daily. Peak (3.5 h after administration) and trough (predose) plasma concentrations of RTV were determined on one occasion at steady-state after a morning dose. Virological response to treatment was quantified as the difference between the baseline value of viral load and the value observed at 6 months of therapy (Delta(6)). RESULTS: The relationship between Delta(6) and demographic parameters (age, weight, BSA, and baseline CD4, percent CD4, and viral load) and plasma concentrations of RTV was studied by linear regression. Median (range) Delta(6) was 0.88 (0.77-2.62) log10 copies/mL. Peak and trough of RTV were 14.9 (3.2-31.4) and 5.0 (0.1-15.6) mg/L, respectively. Trough concentration of RTV was the best predictor of Delta(6), although the relationship between these two variables was not statistically significant (r = 0.56, P = 0.075). CONCLUSION: Our observation of a trend for a greater decrease in viral load in patients with higher trough concentration of RTV warrants further pharmacodynamic studies of PI in paediatric patients.

Area Under Curve↗
PubMed2001

Analysis of the antigen specific T cell repertoires in HIV infection.

In addition to HIV infection, several acquired immunodeficiencies lead to depletion of CD4 lymphocytes. These include immunosuppression resulting from high dose cancer chemotherapy or induced to control graft rejection, as well as in autoimmune diseases. The consequence of this depletion is an increased susceptibility to opportunistic infections or the inability to control primary infection in the case of HIV infection. In all instances a full or partial immunoreconstitution is desirable. In order to monitor the cellular immune state of a patient, rational information cannot be simply derived from phenotypic quantification of T lymphocytes. Instead loss or recovery of CD4 cells should be monitored by defining the specificity, the function and the clonality of the relevant cell population. Several methods are now available for this type of investigation. Here we describe an approach for the definition of clonal heterogeneity of antigen specific CD4 lymphocytes, a parameter that may help monitor loss or reconstitution in acquired immunodeficiencies. As examples of antigen specific CD4 T cell responses we focused on Pneumocystis carinii and on cytomegalovirus, as prototypic opportunistic pathogens which are responsible for severe infections in AIDS and in other immunosuppressive conditions which arise for instance following transplantation. Specific CD4 T cell lines were generated from normal controls and from seropositives in order to select antigen specific lymphocytes. The cells were subsequently analyzed for clonal diversity according to TCR BV gene family usage and according to TCR CDR3 size heterogeneity (spectratyping).

AIDS-Related Opportunistic Infections↗
PubMed2000

Does HGV-HIV co-infection exist?

Hepatitis G virus (HGV) is a recently discovered virus belonging to the Flaviviridae family. Prevalence of HGV active infection (presence of HGV-RNA) in HIV-1-infected patients has been reported in various categories of patients. Our study aimed to find out its prevalence in our cohort of HIV-1-infected children. No investigated child presented with signs of HGV active infection notwithstanding the presence of many risk factors for HGV infection. Prevalence of HGV active infection in our cohort was <2.7%.

Adolescent↗
PubMed2000

Nutritional status changes in HIV-infected children receiving combined antiretroviral therapy including protease inhibitors.

Maintaining linear growth and weight gain in HIV-infected children is often difficult. Nutritional evaluation and support are recognised as important factors to improve their quality of life. Combination antiretroviral therapy including protease inhibitors (HAART) reduces HIV-viral load and improves survival, quality of life and nutritional status. Our study aimed to determine changes in nutrional status based on body weight, height and nutritional habits, of HIV-infected children receiving HAART. Possible side effects of lipid metabolism were also studied. Twenty five children, 13 treated with HAART (group B) were followed up for 12 months. We did not observe statistically significant differences in nutritional status over that time or between groups A and B. Inadequate energy intake was more common in patients with advanced HIV-disease. Hyperlipidemia was found in 70% of children receiving ritonavir and in approximately 50% of children receiving nelfinavir. We observed an important although not statistically significative modification in the height of those in group B.

Adolescent↗
PubMed2000

Possible malignant transformation of benign lymphoepithelial parotid lesions in human immunodeficiency virus-infected patients: report of three cases.

Benign lymphoepithelial parotid lesions (BLL) are intraparotid pathological changes that are commonly thought to be an early manifestation of human immunodeficiency virus (HIV) infection. It is not well known whether BLL may undergo malignant transformation into B cell lymphoma and may therefore be a sort of precancerous lesion. We report 3 cases of possible malignant transformation of BLL in HIV-infected patients.

Adult↗
PubMedDate not supplied

Adherence to combination antiretroviral treatment in children.

PURPOSE: To assess the level of nonadherence to combination antiretroviral therapy of HIV-infected children and to identify the main problems faced by caregivers when giving medicines to children. METHOD: A questionnaire was administered to the caregivers of HIV-infected children who were under combination antiretroviral treatment and were followed at our institution. RESULTS: We evaluated 44 children (mean age, 9.4 years); 13 were treated with a two-drug regimen, 30 with a three-drug regimen, and 1 with a four-drug regimen. Each child received a mean of 8.1 pills and/or syrup doses. In 54.5% of treatments, food restrictions were necessary. The mother was the main person giving medicines to the child (56.8%). A complete written schedule of the child's treatment was present in 50% of families. About 20.5% and 31.8% of children had missed at least one dose of antiretroviral drugs in the last 3 days before assessment and since last visit (1-2 months earlier), respectively. Main problems reported by caregivers were: (a) too many medicines/ pills (34%); (b) difficulty in swallowing pills (29.5%); (c) taking medicines at school or out of home (27.3%); (d) child resisting/refusing therapy/spitting out (25%); and (e) food interactions (22.7%). CONCLUSION: The observed high level of nonadherence was similar to what was reported by other pediatric studies. Specific interventions aimed at improving compliance in pediatric patients were identified: improvement of anti-HIV drug formulations, better counselling for children and their families, and tailoring of antiretroviral treatment. However, caution is necessary in generalizing our results due to the small sample size and to the heterogeneity of the cohort.

Adolescent↗