The clinical effect of topical calcipotriol in acrodermatitis continua of hallopeau.
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Acrodermatitis↗
Biomedical subjects
N Mozzanica
Publications and source records attributed to N Mozzanica.
Posttransplantation cutaneous B-cell lymphoma with monoclonal Epstein-Barr virus infection, responding to acyclovir and reduction in immunosuppression.
Posttransplantation lymphoproliferative disorders (PTLDs) represent an important complication of solid organ transplantation. The main causative factor of PTLDs seems to be the intensity and type of immunosuppressive therapy and the frequent occurrence of Epstein-Barr virus infection. PTLDs that are disseminated at diagnosis or present late after transplantation generally share an unfavorable prognosis and are unlikely to regress in response to reduction in immunosuppressive therapy. We describe a case of cutaneous B-cell lymphoma occurring 4 years after heart transplantation in which molecular analysis revealed a monoclonal pattern of Epstein-Barr virus infection and immunoglobulin gene rearrangement. In spite of its monoclonal nature and late occurrence, the lymphomatous lesions regressed completely after antiviral treatment and a reduction in immunosuppressive therapy.
Acyclovir↗
Production of type-1 and type-2 cytokines by peripheral blood mononuclear cells of psoriatic patients.
We investigated the function of peripheral blood mononuclear cells (PBMC) in 16 patients with active psoriasis, in 15 patients with static psoriasis and in 27 healthy volunteers, by examining in vitro proliferation and antigen- and mitogen-stimulated production of interleukin-2 (IL-2) and IL-4. Plasma levels of the neuropeptide substance P were also determined. Defective alloantigen (ALLO)- and phytohaemagglutinin (PHA)-stimulated IL-2 production was detected in 42% and in 45% of psoriatic patients, respectively. The number of defective IL-2 responders was higher in static (60%) than in active (25%) psoriasis. The reduction of IL-2 responses in the former group was associated with an increase of IL-4 production. Thus PBMC of 66% of patients with static psoriasis but none of the patients with active psoriasis produced elevated amounts of PHA-stimulated IL-4. Variations of plasma substance P levels followed the same pattern of IL-4, being higher in static than in active psoriasis. These observations suggest a co-ordinated action of IL-4 and substance P as modulators of the clinical course of psoriasis. Our data show a possible correlation between the clinical evolution of psoriasis and the production of type-1 and type-2 cytokines, suggesting that the former may have a prominent role in the activation of psoriasis, while the latter may play a protective role.
Acute Disease↗
Plasma neuropeptide levels in psoriasis.
The immune system is important in the pathogenesis of psoriasis and emotional stress has precipitated psoriasis in many patients. Neuropeptides, alpha-Melanocyte stimulating hormone (alpha-MSH), beta-endorphin, met-enkephalin and substance P (SP) act as immunomodulators, and their secretion increases during periods of stress. To see whether these neuropeptides themselves might be related to psoriasis and/or to the aggressiveness of the disease, we evaluated the plasma neuropeptide levels in 13 patients with active psoriasis (patients with new lesions and/or pre-existing lesions that had become larger during the month before the study), in 11 patients with stable psoriasis and in 10 healthy controls. Plasma concentrations of neuropeptides were evaluated by RIA (immunoradiometric assay for beta-endorphin). Data were compared by the Student t-test for unpaired data. There were no significant differences between the plasma levels of any of the neuropeptides between active psoriatic patients and stable psoriatic patients, nor between the plasma levels of neuropeptides of psoriatic patients and those of control subjects. It seems unlikely that circulating neuropeptide levels are of primary importance in the manifestation of the psoriatic skin lesions.
Adult↗
Topical calcipotriol for psoriasis--an immunohistologic study.
The aim of the present study was to investigate the distribution of Langerhans cells and T cells in the lesions and also the phenotypic expression of markers of activation on lesional T cells and keratinocytes, before and after 2 weeks of topical treatment of 7 psoriatic patients with calcipotriol. Before treatment, the infiltrate was composed mainly of T cells and there was decreased expression of CD1 on the intra-epidermal Langerhans cells. ICAM-1 and EGF receptor were present throughout the epidermis, but keratinocytes expressing Transferrin receptor were detected only in the basal layer. After 14 days of calcipotriol therapy, there were significantly fewer CD4T cells in the dermis and an increased number of intraepidermal CD1 + Langerhans cells. ICAM-1 expression on lesional keratinocytes was reduced in all patients, but the expression of EGF receptor was decreased in 3 patients only, and Transferrin receptor expression on keratinocytes had not changed. All these changes were concurrent with moderate clinical improvement of the lesions. The results suggest that in the early stages of the clinical response to calcipotriol there is an immunomodulating effect of the drug associated with variable decreases in keratinocyte expression of markers of activation.
Administration, Topical↗
Topical calcipotriol (MC 903) for psoriasis: a clinical study.
Calcipotriol, a non-calcemic vitamin D3 analogue, inhibits the proliferation and is necessary for final differentiation of keratinocytes. The aim of the present study was to determine the efficacy and tolerability of calcipotriol ointment in patients treated for 6 weeks. Twenty patients with chronic plaque-type psoriasis were treated twice daily with calcipotriol ointment 50 ng/g. After 6 weeks' treatment there was a marked and statistically significant decrease in the PASI score values for 17 patients, no improvement was seen in 1 patient and local adverse events occurred in 2. Hypercalcemia or other laboratory abnormalities did not develop in any patient.
Administration, Topical↗
Topical NSAID allergic contact dermatitis. Italian experience.
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Administration, Topical↗
Cyclosporin in psoriasis: pathophysiology and experimental data.
Cyclosporin has been used efficaciously in recent years for the management of severe psoriasis. The remarkable efficacy of this drug and its known immunosuppressive properties have indicated even more strongly the involvement of the immune system in the induction and maintenance of psoriasis. The present review summarizes the role of cellular immunity in the pathogenesis of psoriasis and possible mechanisms of action of cyclosporin in psoriasis, and describes the laboratory studies performed in our Department under two headings, changes in lesional immune infiltrate (evaluated immunohistologically) and changes in neutrophil chemotaxis during cyclosporin treatment. Our immunohistological study showed that the psoriatic plaques contained an infiltrate composed mainly of activated CD4+ T cells. Cyclosporin treatment significantly decreased T cells and normalized the distribution and antigen expression of intraepidermal Langerhans cells, increasing the number of CD1+ dendritic cells. Our studies on neutrophil chemotaxis showed that cyclosporin reduced the chemotactic activity of neutrophilic polymorphonuclear leukocytes (in vivo but not in vitro), seemingly as a consequence of blocking the production of chemoattracting cytokines by psoriatic monocytes.
CD4-Positive T-Lymphocytes↗
Plasma alpha-melanocyte-stimulating hormone, beta-endorphin, met-enkephalin, and natural killer cell activity in vitiligo.
BACKGROUND: The immune system is important in the pathogenesis of vitiligo, and emotional stress has precipitated vitiligo in some patients. Opioid peptides, beta-endorphin, met-enkephalin, and alpha-melanocyte-stimulating hormone (MSH) act as immunomodulators, and their secretion increases during periods of stress. OBJECTIVE: To see whether these three neuropeptides might be related to vitiligo itself or to some alterations of the immune system in patients with vitiligo, we compared circadian variations in their plasma concentrations and natural killer cell activity of peripheral blood lymphocytes in 14 patients with vitiligo with those of 12 healthy subjects. METHODS: Plasma concentrations of neurohormones were evaluated by radioimmunoassay (immunoradiometric assay for beta-endorphin). Natural killer cell activity (NKCA) was assayed against K562 cells by 51Cr release technique. Data were compared by the Student t test and analyzed by cosinor analysis. RESULTS: The NKCA in vitiligo patients was higher than in controls but had similar circadian rhythm. alpha-MSH had no circadian rhythm in controls or in patients; plasma alpha-MSH levels were the same. Daily met-enkephalin and beta-endorphin oscillations in patients were no longer circadian. beta-Endorphin plasma levels in stable vitiligo were higher than in controls. There were no differences between patients with active vitiligo and normal subjects. Met-enkephalin plasma levels were generally higher in vitiligo patients, especially in the one with active vitiligo, than in controls. CONCLUSION: In vitiligo there are aberrations in neuropeptide, beta-endorphin, and met-enkephalin secretion. The plasma met-enkephalin level is positively correlated with the aggressiveness of the disease.
Adult↗
Immunohistologic evaluation of the effect of cyclosporine treatment on the lichen planus immune infiltrate.
We have investigated immunohistologically the cutaneous immune infiltrate in the lesions of five patients with severe, extensive lichen planus of recent onset before and after 15 days of oral, low-dose cyclosporine therapy (3 mg/kg/day). Before therapy, we observed an abnormal bandlike cellular infiltrate localized in the papillary dermis, composed mostly of CD3+ cells, with a prevalence of CD4+ cells. Infiltrating lymphocytes showed markers of activation (HLA-DR antigens and interleukin 2 receptor), and there were many Langerhans (CD1+) cells in the dermal infiltrate. After 15 days of cyclosporine therapy, we observed a dramatic decrease in the total number of T cells and a corresponding decrease in interleukin 2 receptor-positive activated CD25+ cells and in antigen-presenting cells (CD1+ and CD14b+). These changes were concurrent with clinical improvement. Our results are compatible with the hypothesis that the inhibition of CD4 T cells by cyclosporine might explain the drug's therapeutic action and that the interaction between antigen-presenting cells and CD4 T cells is important in the pathogenesis of lichen planus.
Adult↗
Association between circadian rhythms of endogenous hypothalamic opioid peptides and of natural killer cell activity.
To explore in man the hypothesis that natural killer cell activity and hypothalamic-hypophyseal hormones constitute a mutually coupled multioscillatory system, we analysed and compared, in 11 healthy volunteers, the circadian variations in plasma concentrations of beta-endorphin, met-enkephalin and alpha-MSH, and of natural killer activity of peripheral blood lymphocytes. Natural killer cell activity and plasma beta-endorphin levels showed a similar circadian rhythm with the peak in the morning (acrophases at 06.14 and 08.25, respectively), whereas the circadian rhythm of met-enkephalin was approximately in antiphase to the natural killer rhythm (acrophase close to 17,00 hours). Although daily variation of alpha-MSH showed greater inter-individual variability, a circadian rhythm was statistically validated. Analysis of correlation between rhythmometric parameters (mesor, amplitude, peak and nadir) of natural killer cell activity vs neuro-endocrine hormones revealed that the minimum and medium daily concentrations of beta-endorphin correlated directly with the corresponding parameters of natural killer activity, while the maximum and medium concentrations of met-enkephalin were inversely correlated with the peak and the mesor of natural killer activity. The amplitude of natural killer cell activity oscillations correlated directly with the peak, mesor and nadir concentrations of alpha-MSH. We show here that circadian rhythms of some neuroendocrine hormones of the hypothalamic-hypophyseal axis, i.e. beta-endorphin, met-enkephalin and alpha-MSH, are significantly coupled to daily oscillations of NK cell activity.
Adolescent↗
Intralesional alpha 2b recombinant interferon for basal cell carcinomas.
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Aged↗
Immunohistological evaluation of basal cell carcinoma immunoinfiltrate during intralesional treatment with alpha 2-interferon.
We investigated the peritumoral and intratumoral immune infiltrate in 6 basal cell carcinomas (BCCs) treated with recombinant alpha 2b-interferon. Each BCC was injected intralesionally three times a week for 3 weeks with 1.5 x 10(6) IU of interferon per injection (total dose 13.5 x 10(6) IU). The immunohistological study was done before the start of interferon therapy and 15 days afterwards, using a series of monoclonal antibodies and an immunocytochemical technique. Before therapy the infiltrate consisted mainly of CD3+ (T) cells, with prevalence of CD4+ (helper/inducer) T cells. The percentage of T cells expressing interleukin-2 receptor (CD25+ cells) was higher in the tumor nests than in the peritumoral infiltrate (20% and 11% respectively). CD1+ (Langerhans) cells and CD14b+ cells (monocytes/macrophages) were present in the peritumoral infiltrate in all cases (9% +/- 5% and 14% +/- 7% respectively). Very few CD56+ (natural killer), CD15+ (granulocytes) and CD20+ (B) cells were observed in the peritumoral infiltrate and none at all in tumor nests. After 15 days of interferon therapy, we observed an increase in peritumoral and intratumoral CD4+ cells. There was a decrease in the number of CD25+ cells and of CD1+ cells in the peritumoral infiltrate. The number of intratumoral CD25+ increased. No variations were seen in CD14b, CD15, CD20, and CD56 positive cells. Eight weeks after completion of therapy, two BCCs were cleared and the remaining four showed clinical and histological improvement. These results may indicate a direct effect of interferon against BCC; in addition the immunohistological findings suggest that intralesional interferon enhances T cell mediated immune response, especially in tumor nests.(ABSTRACT TRUNCATED AT 250 WORDS)
Aged↗
T cell subpopulations in vitiligo: a chronobiologic study.
The circadian rhythms of helper (CD4) and suppressor (CD8) T cells from the peripheral blood of 12 vitiligo patients (seven with active disease, five with static) and 12 healthy control subjects were studied. Patients with active vitiligo had a lower percentage of CD4+ cells than did control subjects at 0000 hours and at 0600 and 1200 hours; there were no differences between these values in patients with static vitiligo and those in control subjects. The percentage of CD8+ cells were lower at 1200 and 1800 hours in both active and static vitiligo patients than in control subjects. Cosinor analysis of the CD4+ cells showed a circadian rhythm in static vitiligo, whereas the rhythmicity was lost in active vitiligo. CD8+ cells did not show any circadian rhythm in either active or static vitiligo. Our data show more striking aberrations for T cell subtypes in active vitiligo than in static vitiligo. They suggest that cell-mediated immunity may play a role in the pathogenesis of the disease.
Adolescent↗
Cyclosporin A for treatment of severe lichen planus.
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Adult↗
HLA-A, B, C and DR antigens in nickel contact sensitivity.
The relationship between HLA antigens (A, B, C and DR) and nickel contact sensitivity was examined in 54 patients with contact allergy, as confirmed by an unequivocal positive patch-test reaction only to nickel. A control group was 320 healthy blood donors from the same geographical area as the patients. The HLA-A, B, C and DR antigens were typed using standard serological methods. HLA typing revealed a significant increase of HLA-DRw6 antigen in the patient group (corrected P less than 0.025) and the relative risk for patients with DRw6 to develop nickel sensitivity was 3.32.
Adolescent↗
Contact and photocontact allergy to ketoprofen: clinical and experimental study.
In the last 3 years, we have studied 10 patients with allergic reactions to topical ketoprofen. We have investigated the sensitization and irritant potential of the drug and the possibility of cross-reactivity with other aryl-propionic non-steroidal anti-inflammatory drugs (ibuproxam, ibuprofen, naproxen, fenoprofen, flubiprofen and tiaprofenic acid). 2 of our patients had contact dermatitis, and the other 8 photocontact dermatitis. One of our patients showed cross-reactivity between ketoprofen and ibuproxam on patch testing. In the photopatch tests, we observed cross-reactivity between ketoprofen and tiaprofenic acid in 2 patients, and cross-reaction between ketoprofen and ibuproxam and flurbiprofen in another case. Experimental studies, including human maximization and photomaximization tests, performed in 20 healthy volunteers, showed a complete absence of sensitization, 3 volunteers showed a marked irritant reaction to ketoprofen (20% pet.) during either maximization (2 cases) or photomaximization (1 case) tests. Although ketoprofen appears not to be a sensitizing agent in human volunteers, the fact that photosensitization to this drug seems to be quite common after topical use suggests that there are some local or individual factors, at present unknown, facilitating the development of allergy.
Administration, Cutaneous↗
Circadian rhythm of natural killer cell activity in vitiligo.
Ten patients with vitiligo, either in the active (six cases) or static (four cases) phase, and twelve healthy control subjects were studied with a standard cytotoxicity assay to evaluate the circadian rhythm of natural killer cell activity from peripheral blood mononuclear cells. The natural killer cell activity was measured at the zero, sixth, twelfth, and eighteenth hours of the day. The results demonstrated that patients with vitiligo had significantly higher natural killer cell activity compared with normal controls. When patients with static and active vitiligo were compared, those with the static form had increased natural killer cell activity at all times except noon, whereas those with active form had increased natural killer cell activity only at 0600 and 1800. These changes shifted the acrophase of the circadian rhythm of each group. Indeed, by cosinor analysis, both patients with vitiligo and normal controls had similar circadian rhythms, but the acrophase was shifted from 0602 in control subjects to 0435 in the ten patients with vitiligo. The acrophase in the six patients with active vitiligo was found to be closest to that of normal controls (0508). These findings indicate that natural killer cell activity abnormalities are more marked in the static rather than in the active form of vitiligo.
Adult↗