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Biomedical subjects

A Zicca

Publications and source records attributed to A Zicca.

At least 19 recordsLinked to original sources
PubMed2001

Unconventional medicine teaching at the Universities of the European Union.

CONTEXT: The recent rapid increase in demand for and use of unconventional medicine requires an adequate medical education. In the United States, 64% of medical schools offer undergraduate courses. No information is available about similar courses at European universities. OBJECTIVES: To document the incidence of educational courses on unconventional medicine offered by the European universities and their topic content. DESIGN: Mail survey, which consisted of two questionnaires and was conducted in 1999 (January-June). The first questionnaire was sent to the universities' Rectorats, the second one to the faculties or lecturers indicated by the replies to the first questionnaire. PARTICIPANTS: The Universities listed by the Confederation of European Union Rectors' Conference. MAIN OUTCOME MEASURES: Courses offered at European Universities, both at medical faculties and at other faculties. RESULTS: Five hundred and fifty (550) universities were contacted. Replies were received from 326 (59%); 141 have a faculty of medicine and 107 (76%) of them replied. We also received answers from 29 faculties of health sciences. In addition we received 190 (50%) answers from 380 other miscellaneous universities. Courses on unconventional medicine were offered by 43 (40%) medical schools, 21 (72%) health sciences faculties, and by 15 (8%) other faculties. Topics covered encompassed a wide range of techniques (33), from homeopathy to shamanism. CONCLUSIONS: Unconventional medicine courses are widely represented at European universities. They cover a wide range of therapies. Many of them are used clinically. Research work is underway at several faculties.

Complementary Therapies↗
PubMed2001

Schwann cell-derived factors support serotoninergic neuron survival and promote neurite outgrowth.

During embryogenesis and the postnatal period, neurons and glia interact in the development and differentiation of specific populations of nerve cells. Both in the peripheral (PNS) and in the central nervous system (CNS), glial cells have been shown in various experimental conditions to constitute a favorable substrate for neural adhesion, neural polarity, shape and axonal extension, while numerous soluble molecules secreted by neurons influence the survival and differentiation of the glial cells themselves. The aim of the present work was to investigate the influence of postnatal Schwann cells (SC) on embryonic serotoninergic (5-HT) neurons of the raphe, in order to study the possible influence of the peripheral glia on the CNS neurons. Cultures of SC from sciatic nerve of postnatal rats and neurons from rat embryonic rhombencephalon were successfully established and cells were immunocytochemically characterized. The number of 5-HT neurons, and the number and length of their branches were quantified in the cultures of 5-HT neurons, in cultures added with Nerve Growth Factor (NGF) and Insulin-like Growth Factor I (IGF-I), in co-cultures with SC and in cultures added with conditioned medium obtained from SC cultures. The results indicated that SC have the capacity to promote the survival and growth of 5-HT neurons in culture, and that this activity is mediated by soluble factors. Although the precise nature and mechanism of action of the growth factor or factors produced by SC in the presence of 5-HT neurons was not identified, our results add more data on the possible activity of the peripheral glia in promoting and enhancing the survival and outgrowth of the CNS neurons.

Animals↗
PubMed2000

Reduction of cisplatin nephrotoxicity by procainamide: does the formation of a cisplatin-procainamide complex play a role?

Procainamide protects mice bearing P388 leukemic cells against the toxicity of cisplatin without diminishing antitumor activity. The mechanism of action of procainamide protection was investigated both in vitro and in vivo. HPLC studies showed that procainamide forms a complex with cisplatin in vitro that has a UV spectrum similar to that of DPR, a triamine platinum complex that contains procaine as ligand. We report here the effect of the reaction product of cisplatin and procainamide on both cisplatin-induced DNA interstrand cross-links (ISCLs) and on the total DNA platination of isolated DNA. Total DNA platination in vitro of isolated DNA was increased by 113% (P <.01) and 17% (P <.05) after incubation times of 1.75 and 6 h, respectively, compared with products from the reaction of cisplatin with water. Furthermore, the reaction product of cisplatin and procainamide was bound to DNA to a significantly greater extent than was cisplatin itself. ISCLs were decreased by 41% when this drug combination was incubated with DNA for 1.75 h, but no changes were observed after incubation for 6 h. We also examined the influence of the time interval between administration of cisplatin and procainamide on normal kidney injury, the renal distribution and urinary excretion of platinum, and the formation of cisplatin-DNA adducts in renal tissue of Sprague-Dawley rats after i.p. administration of 7.5 mg/kg cisplatin either with or without procainamide. The plasma concentrations of urea and creatinine and kidney histology demonstrated that procainamide provided effective protection in vivo in the rat when administered either simultaneously or at 0.5 and 1 h before or after cisplatin. The protection was accompanied by both higher renal levels of platinum and cisplatin-DNA adducts and by an increase in the formation of ISCLs. Moreover, a dose-dependent reduction of urinary excretion and concentration of platinum was also observed. We propose that procainamide, after accumulation in the kidney, may coordinate with cisplatin to form a less toxic DPR-like complex that renders rats less susceptible to cisplatin-induced toxicity.

Animals↗
PubMed1999

Forebrain white matter in spontaneously hypertensive rats: a quantitative image analysis study.

The volume and the morphology of brain white matter as well as the number and the size of glial fibrillary acidic protein (GFAP)-immunoreactive astrocytes were investigated in 6-month-old spontaneously hypertensive rats (SHR) and age-matched normotensive Wistar-Kyoto (WKY) rats. The volume of frontal and occipital cortex and of hippocampus was decreased in SHR in comparison with normotensive rats, whereas the volume of neostriatum was unchanged. A remarkable decrease of the volume of internal capsule and striosomes, a moderate reduction of that of corpus callosum and no changes of the volume of external capsule and of white matter of hippocampus were also observed in SHR. In SHR the number of astrocytes was higher in the frontal and occipital cortex and in the white matter of the CA1 and CA3 subfields of the hippocampus, but not in the corpus callosum or in the grey matter of the CA1 and CA3 subfields. Staining for myelin did not reveal alterations in single fibre sheath morphology. These findings indicate the occurrence of changes of forebrain white matter in SHR, consisting in the reduction of it without qualitative modifications of myelinated fibres. The development of gliosis apparently not related with changes of volume of white matter was also found.

Animals↗
PubMed1997

Secretion and binding of HMG1 protein to the external surface of the membrane are required for murine erythroleukemia cell differentiation.

We show here that murine erythroleukemia (MEL) cells, following induction with hexamethylene bisacetamide, accumulate high mobility group (HMG)1 protein onto the external surface of the cell in a membrane-associated form detectable by immunostaining with a specific anti-HMG1 protein antibody. This association is maximal at a time corresponding to cell commitment. At longer times, immunostainable cells are progressively reduced and become almost completely undetectable along with the appearance of hemoglobin molecules. Binding to MEL cells does not affect the native molecular structure of HMG1 protein. The type of functional correlation between HMG1 protein and MEL cell differentiation is suggested by the observation that if an anti-HMG1 protein antibody is added at the same time of the inducer almost complete inhibition of cell differentiation is observed, whereas if the antibody is added within the time period in which cells undergo through irreversible commitment, inhibition progressively disappears. A correlation between MEL cell commitment and the biological effect of HMG1 protein can thus be consistently suggested.

Acetamides↗
PubMed1997

Rat tibial osteoblasts III: propagation in vitro is accompanied by enhancement of osteoblast phenotype.

Postproliferative confluent cultures of primary rat tibial osteoblasts (ROB), cultured in medium supplemented with ascorbic acid and beta-glycerophosphate (AS-bGP, differentiation medium) express, in sequence, specific bone markers which identify a succession of maturation stages, and eventually form mineralized noduli. We report an investigation on the effect of extensive proliferation in vitro in unsupplemented medium on the osteogenic potential of mass cultures of ROB. The growth rates of the populations, derived from two independent primary cultures, was constant throughout 110 cumulative population doublings (CPD) in culture. Propagated cells maintained features similar to osteoblasts in primary cultures with respect to serum and anchorage dependence for growth and to the chemokinetic effect on endothelial cells exerted by their conditioned media (CM). Propagated populations, set at confluence in differentiation medium, were tested for the expression of early [alkaline phosphatase (AP)] and late [osteocalcin (OC); bone sialoprotein (BSP); 45Ca incorporation and mineralization] osteogenic markers. We observed an increase, parallel to the increase in CPD, in both the level of maximal expression of AP (enzyme/microgram cellular DNA) and in the frequency of nodules, reaching five- to sixfold (at 78 CPD) and eightfold (at 60 CPD), respectively, the levels of primary cultures. AP expression (enzyme and mRNA) persisted during mineralization and 45Ca incorporation. The time required by propagated cultures for the formation of nodules decreased with increase of CPD, and was reduced to less than one third at 87 CDP. Nodules became mineralized over a similar lapse of time as in primary cultures and were positive by histochemistry for BSP and OC. We also obtained osteogenic clones from two independent cultures after 72 CPD. 90% of these showed an osteoblast phenotype, expressing AP and forming nodules positive for OC and BSP, which mineralized. Timing of formation and frequency of nodules/plated cells in clones was similar to that found in propagated cultures of equivalent CPD. In summary, propagated ROB populations and derived clones showed enhanced osteoblast phenotype, possibly due to an increase in osteogenic cells and enrichment of proliferating mature osteoblasts, consequent to extended propagation in culture.

Alkaline Phosphatase↗
PubMed1996

Effect of the antiarrhythmic drug procainamide on the toxicity and antitumor activity of cis-diamminedichloroplatinum(II).

The class I antiarrhythmic drug procainamide (Pd) was tested on BDF1 mice for its chemoprotective activity against cis-diamminedichloroplatinum(II) (DDP) toxicity. Pd at the dose of 50 mg/kg protected mice against otherwise lethal doses of DDP (survivors at Day 14 after 25 mg/kg DDP or 25 mg/kg DDP-Pd treatment: 0% vs 100%) and greatly reduced the weight loss induced by DDP. Moreover, the increased plasma urea nitrogen levels caused by a single ip administration of DDP in water (8 or 16 mg/kg) as well as the tubular degenerative changes detected by light microscopy were prevented by Pd. Pd had no effect on the sensitivity of P388 leukemic cells to DDP in vitro, but the administration of DDP (16 mg/kg) and Pd (50 mg/kg) to BDF1 mice bearing P388 leukemic cells produced a significant increase in survivals compared to mice receiving ip DDP alone diluted in 0.9% NaCl solution. The increased efficacy of this combination therapy in P388 leukemic mice compared to a single DDP treatment at the same dose was observed both when the drugs were administered ip simultaneously (p = 0.042) and when DDP and Pd were given ip and iv, respectively (p = 0.018). Since procaine, which differs from Pd merely in the replacement of the amide by the ester linkage, has also been reported to significantly enhance DDP efficacy (M. Esposito et al., 1990, J. Natl. Cancer Inst. 82, 677-684.), a comparison of their effects in tumored mice exposed to DDP has been made. Although both drug combinations were superior to that of DDP alone, in terms of both survival time and numbers of cures, Pd treatment seems to offer better protection against DDP-induced lethality than did procaine.

Animals↗
PubMed1993

Expression of common acute lymphoblastic leukemia antigen (CD 10) by myelinated fibers of the peripheral nervous system.

The common acute lymphoblastic leukemia antigen (CALLA), CD10, is a 100-kDa surface glycoprotein endowed with neutral endopeptidase activity, shared by a number of hemopoietic and non-hemopoietic cells. In this report, immunohistochemical and Western blot techniques, using different anti-CD10 monoclonal antibodies, were utilized to demonstrate that CD10 is also expressed by myelin sheaths of the human peripheral nervous system (PNS), but not of the central nervous system. CD10-positive immunoreactivity appeared to be localized in the outer and inner borders of myelinated fibers, in nodes of Ranvier and in the Schmidt-Lantermann clefts, thus showing a distribution pattern very similar to that of myelin-associated glycoprotein (MAG). The above findings suggest that CD10 antigen, through its enzymatic activity, may have a functional role in the assembly and maintenance of PNS myelin. In addition, it is not known whether CD10, similarly to MAG, may be a target antigen in some PNS immune-mediated disorders.

Antibodies, Monoclonal↗
PubMed1993

Para-aminobenzoic acid suppression of cis-diamminedichloroplatinum(II) nephrotoxicity.

Concurrent administration of para-aminobenzoic acid (PABA) reduced the toxicity of cis-diamminedichloroplatinum(II) (DDP) in a dose-related manner in rats. When administered i.p. simultaneously with 7.5 mg/kg DDP, PABA (100 mg/kg) significantly reduced plasma urea nitrogen (PUN) and plasma creatinine levels as well as DDP-induced weight loss. Increasing doses of PABA (25, 50 and 100 mg/kg) correlated with progressively better parameters of renal activity and body wt and with lower levels of platinum in plasma and tissues in rats killed 5 days after drug administration. The formation of cisplatin-DNA adducts, the total platinum levels in kidney and testes and the DDP-induced tumor response were investigated in the presence and absence of PABA exposure in mice bearing P388 leukemic cells. Renal and testicular DNA-adducts in mice treated i.p. with 16 mg/kg DDP in normal saline were higher than those observed in mice receiving the same protocol and added PABA. Analysis of tissue platinum content demonstrated significantly lower platinum levels both in kidneys (P < 0.05) and testes (P < 0.01) of mice receiving DDP and PABA in normal saline compared to those receiving only DDP in normal saline. PABA did not affect the in vivo and in vitro antitumor activity of DDP against P388 leukemia, and there was no significant PABA-induced modification in the concentration of platinum both in the tumor cells and in DNA samples isolated from P388 leukemic cells of DDP-treated mice. We conclude that PABA may be a promising compound for reducing DDP-toxic side effects, including nephrotoxicity, without compromising its antitumor activity.

4-Aminobenzoic Acid↗
PubMed1992

GFAP expression of human Schwann cells in tissue culture.

We have studied the expression of the intermediate filament (IF) proteins, vimentin and glial fibrillary acidic protein (GFAP), in cultured human Schwann cells (SC) from patients with different neuropathies and normal control cases. SC cultures from sural nerve biopsies of 8 subjects with axonal neuropathies, 8 with demyelinating neuropathies and 3 normal controls were included in this study and processed with double immunofluorescence technique, using anti-vimentin and anti-GFAP antibodies, during the 2nd, 4th and 6th week of culture. Five cultures incubated with anti-GFAP antibodies were also processed for immunoelectron microscopy. Specificity tests of the used antibodies were performed. We have found that: (1) cultured human SC constantly express vimentin; (2) SC from normal controls are GFAP-negative in the first period of culture; (3) SC from pathologic nerves can contain GFAP-immunoreactive IF and the percentage of GFAP-positive SC is higher in axonal than in demyelinating neuropathies; (4) during the permanence in culture human SC from both normal and pathologic cases acquire the ability to synthesize GFAP. The obtained data suggest that the removal from axonal contact and the resulting loss of myelinating function induce a cytoskeletal cellular response in human SC characterized by the cytoplasmic accumulation of GFAP-immunoreactive IF.

Antibody Specificity↗
PubMed1991

Schwann cell GFAP expression increases in axonal neuropathies.

We studied the Schwann cell (SC) GFAP immunoreactivity in normal human peripheral nerves and in neuropathies of different origin. Immunofluorescence and immunocytochemistry were carried out on serial frozen sections of 58 peripheral nerve biopsies using monoclonal antibodies (mabs) antivimentin and anti GFAP, and antiserum anti S-100 and anti GFAP. To test the specificity of the mabs and antiserum used, proper competition controls on tissue sections of 2 selected cases, tissue cultures studies of human fibroblasts and immunoblotting of homogenates of human fibroblasts, 3 normal and 5 pathologic nerves were carried out. In order to evaluate a possible correlation between SC GFAP positivity and neuropathologic findings a quantitative study was performed, evaluating the SC GFAP reactivity in all the 58 cases, and relating the SC GFAP positivity to the index of nerve pathology (IP) in 9 selected cases, and to the percentage of teased fibers showing axonal degeneration or demyelination and remyelination in 25 representative cases. We demonstrate that in normal human sural nerves and in demyelinating neuropathies only a few scattered SC are recognized by the mabs or antiserum anti GFAP. On the contrary in axonal neuropathies the majority of SC gain the property to express intermediate filaments which show common antigenic properties with GFAP.

Antibodies, Monoclonal↗
PubMed1990

Improved therapeutic index of cisplatin by procaine hydrochloride.

The local anesthetic procaine hydrochloride (P.HCl) had little effect on the sensitivity of P388 leukemic cells to cisplatin (DDP) in vitro, but the simultaneous administration of DDP and P.HCl (40 mg/kg) to BDF1 mice produced 50% lethal dose (LD50) and 90% lethal dose (LD90) values approximately two times higher than those observed with DDP alone. DDP-P.HCl diluted in water and administered intraperitoneally (IP) on day 1 and on days 1 and 5 to BDF1 mice bearing P388 leukemic cells produced 33% and 50% cure rates, respectively, at the maximum tolerated dose (16 mg/kg for the single administration and 10 mg/kg given on days 1 and 5). In contrast, under the same conditions, the cure rates obtained with DDP alone (10 mg/kg for the single administration and 8 mg/kg given on days 1 and 5) were 17% and 9%, respectively. Protection from DDP nephrotoxicity seems to be the explanation for the higher doses of DDP that mice can tolerate when DDP is given simultaneously with P.HCl. In fact, the increased blood urea nitrogen (BUN) levels observed 4-7 days following a single IP administration of DDP (8 or 16 mg/kg), as well as the tubular degenerative changes detected by light microscopy, were not observed when the same doses of DDP were given simultaneously with P.HCl. Since DDP nephrotoxicity is known to be reduced when the drug is diluted in 0.9% NaCl solution, we compared the combinations DDP-P.HCl in water, and DDP and DDP-P.HCl in 0.9% NaCl solution. The antitumor activity of DDP diluted in water and administered with P.HCl was similar to that observed in mice treated with DDP alone diluted in 0.9% NaCl solution. However, further improvement of the therapeutic index was achieved after the administration of DDP-P.HCl diluted in 0.9% NaCl solution; this regimen produced a cure rate of 67% (12 of 18 animals). The clinical relevance of these findings is strengthened by the observation that similar results were obtained when P.HCl was given by the intravenous route.

4-Aminobenzoic Acid↗
PubMed1989

Class II antigen expression on human cultured Schwann cells from patients with Charcot-Marie-Tooth disease.

T lymphocytes control the extent of the immune reaction by recognizing the antigen in connection with class II histocompatibility surface molecules, coded by genes located on the HLA-D locus. The expression of HLA-DR antigens is confined to a few antigen presenting cells, like lymphocytes and macrophages, which can therefore induce the initial phase of the immune reaction. We report that also Schwann cells (SC) from patients with Charcot-Marie-Tooth disease (CMT), an hereditary disorder of the peripheral nervous system, are able to express HLA-DR antigens. Human SC cultures were carried out from sural nerve biopsies of CMT and normal control cases. Cultures were tested on day 7, 14, 21 and 28, with double immunofluorescence technique using rabbit antiserum anti-S-100 and mouse anti-HLA-DR monoclonal antibody. SC from CMT were HLA-DR positive since the first few days, continuing to express class II antigens for all the duration of the culture. The presence of class II antigens on cultured SC from CMT disease suggests that immune-mediated mechanisms may be relevant in the pathogenesis of this degenerative disorder of the peripheral nervous system.

Cells, Cultured↗
PubMed1989

[The culturing of human Schwann cells: a new contribution to the study of polyneuropathy].

We have established 44 Schwann cell cultures from human peripheral nerves that underwent biopsy for diagnostic purposes using a new "sandwich" connective tissue and cut into 1 mm cubic explants which were placed between two glass coverslips coated with D-poly-L-lysine, in HAM-F10 medium, 15% FCS, 600 mg/dl glucose and antibiotics. In the first 3 weeks this new sandwich technique yields a fairly great and homogeneous amount of Schwann cell growth, with only a few fibroblasts and virtually no macrophages and provides a suitable substrate on which immuno cytochemical studies could be performed.

Antigens, Surface↗
PubMed1989

[Hereditary sensory motor neuropathy: degenerative disease or a disease with an immune-mediated pathogenesis?].

The clinical data proving that some hereditary motor-sensory neuropathies (HMSN type 1) are steroid sensitive may indicate inflammatory or immunomediated mechanisms as cofactors contributing to the clinical course of these disorders. The finding of HLA-DR positivity of Schwann cells in HMSN type I along with the presence in some cases of inflammatory infiltrates in nerve sections provides further evidence for this hypothesis.

Autoimmune Diseases↗
PubMed1988

HLA-DR Schwann cell reactivity in peripheral neuropathies of different origins.

HLA-DR antigens have been found on Schwann cells in peripheral neuropathies of different origins but not in normal control cases. Class II antigen reactivity was more intense in chronic inflammatory demyelinating polyradiculoneuropathy (CIDP) and hereditary motor and sensory neuropathy type 1 (HMSN), but was also observed in toxic or metabolic neuropathies. The expression of HLA-DR antigen on Schwann cells does not appear to be related to the inflammatory or autoimmune origin of the disease.

Antibodies, Monoclonal↗