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Biomedical subjects

H Rollag

Publications and source records attributed to H Rollag.

97 records · Page 6Linked to original sources
PubMed1975

Serum levels of penicillin v after oral administration of pediatric preparations to healthy subjects.

The bioavailability of nine commercial pediatric preparations of penicillin V was tested in a double-blind, cross-over fashion on ten healthy student nurses who were given 1 mill I.U. of the various preparations. The serum concentrations were determined using the paper disc method of "AB Biodisc" Sweden. The preparations could be divided into two different groups: (1) the mixtures (2) the effervescent tablets, substance for drops and granulate. This classification is based upon the mean peak serum levels obtained. With one exception the peak serum levels in group 2 were significantly higher than in group 1. 2,4 and 6 hours after ingestion there were no differences in the serum levels, indicating that none of the preparations gave sustained high serum levels. The results presented indicate that the preparations in group 2 should be preferred.

Administration, Oral↗
PubMedDate not supplied

The effect of 1,25-vitamin D3 on maturation of monocytes from HIV-infected patients varies with degree of immunodeficiency.

The active metabolite of vitamin D, 1,25-dihydroxyvitamin D3 (1,25D), has been shown to induce monocyte-to-macrophage maturation in vitro as well as monocytic differentiation of bone marrow precursors and monocytic leukaemic cell lines. In this study we assessed whether 1,25D could improve the maturation defect we have previously demonstrated in monocytes from AIDS patients. In vitro growth and maturation of monocytes from 10 controls, 15 asymptomatic HIV positives (CDC group II or III) and 13 symptomatic HIV positives (CDC group IV) was examined by assessing cellular morphology, differentiation, adherence and protein content. Cells were cultured for 10 days with or without addition of 1,25D at a concentration of 100 pg/ml. In addition, patients were monitored clinically and by immunological parameters and HIV p24 antigen in serum. The present study showed that addition of 1,25D significantly improved the growth and maturation in both patient and control groups. There was a significant negative correlation between response to 1,25D and CD4+ lymphocyte count in blood in HIV-infected patients. A greater response to 1,25D was seen in monocytes from patients with advanced immunodeficiency and symptomatic disease than in monocytes from asymptomatic patients. However, in the most advanced cases of HIV infection with serious ongoing opportunistic infections the response to 1,25D was very poor, possibly reflecting profound and incorrigible dysfunction of monocytes.

Adult↗
PubMedDate not supplied

Effect of in vitro acyclovir treatment on selected functions of blood-derived macrophages.

The effect of acyclovir (ACV) treatment on selected functions of human blood-derived macrophages was examined. ACV was not cytotoxic when applied in a wide range of concentrations. Only minor effects on macrophage functions were observed when cells were treated with therapeutic concentrations of ACV:phagocytosis and the production of interferon and tumor necrosis factor were slightly enhanced, while the production of lysozyme was reduced, in a dose-dependent manner. Interferon production was also reduced in the presence of high concentrations of ACV.

Acyclovir↗
PubMedDate not supplied

Effects of alpha- and beta-interferon on oxidative burst responses of monocytes and monocyte-derived macrophages from patients with HIV infection.

In the present paper, we have studied the effects of interferon (IFN) -alpha and IFN-beta on the oxidative burst (OB) responses in monocytes and monocyte-derived macrophages from patients with a relatively early phase of HIV infection. We found that in monocytes from patients with HIV infection, the defective OB response could be partially restored by pretreatment with IFN-beta when the cells were challenged with zymosan. No such stimulatory effect was seen in the control groups. In monocyte-derived macrophages, both IFN-alpha and IFN-beta stimulated the phorbol myristate acetate (PMA) induced OB response in the patient group as well as in the blood donor control group. Generation of an OB is an important part of the antimicrobial defence of mononuclear phagocytes. The positive effects of IFN on the OB responses of monocytes and macrophages from patients with HIV infection may be of importance when IFNs are considered in the treatment of HIV-related disease.

Cells, Cultured↗
PubMedDate not supplied

Phagocytic activity and protein content of human monocytes cultivated in the presence of various homologous interferon preparations.

We have studied the effect of different types of interferons (IFN) on phagocytic activity and protein content when present during in vitro cultivation of human blood monocytes. Recombinant IFN-alpha and partially and highly purified leukocyte IFN preparations blocked the increase in phagocytic activity and protein content that occurs during in vitro cultivation of human monocytes. Fibroblast IFN blocked the increase in protein content, but did not significantly alter the phagocytic activity. IFN-gamma slightly enhanced phagocytic activity and protein content, while lymphoblastoid IFN preparations had no effect. The phagocytic activity and protein content of monocytes matured in vitro without IFN and then treated with IFN for 24 h was also tested. Phagocytosis via the non-specific receptors and the protein content was reduced by treatment of these cells with the IFN-alpha preparations. On the other hand Fc-receptor mediated phagocytosis was stimulated by IFN-gamma. Our data indicate that IFN effects on monocytes in culture varies depending on type and possibly subtypes of IFNs, and also on the timing of the treatment.

Blood Proteins↗