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Biomedical subjects

C Smirne

Publications and source records attributed to C Smirne.

12 recordsLinked to original sources
PubMed2006

Unsuspected strongyloidiasis in hospitalised elderly patients with and without eosinophilia.

The prevalence and associated factors of chronic uncomplicated strongyloidiasis were estimated among 200 consecutive elderly patients (aged >or= 60 years) admitted to a general hospital in northern Italy. One-hundred patients had a peripheral eosinophil concentration >or= 500 cells/microL (group A), and 100 were age- and gender-matched controls (group B). Measurements included serum IgG anti-Strongyloides antibody titre by an indirect immunofluorescence assay, combined with faecal culture for Strongyloides stercoralis. Anti-Strongyloides antibodies were detected in 28 patients (at high titre in 11 patients). Seropositivity was significantly more common among group A than among group B patients (OR 4.85). Strong seropositivity for anti-Strongyloides antibodies was associated with farm work (p < 0.001), but not with other patient characteristics or with signs and symptoms of strongyloidiasis. In conclusion, strongyloidiasis was relatively common among elderly in-patients; eosinophilia and a history of farm work were the most useful indications for this diagnosis.

Aged↗
PubMed2004

Sexually transmitted diseases and pelvic inflammatory disease.

AIM: The aim of this study was to determine the prevalence in the Turin area of the pathogens most implicated in pelvic inflammatory disease (PID), with particular regard to which risk factors the population taken into consideration is exposed to. METHODS: From January 1st 1997 to December 31(st) 2001, 13809 women, aged between 14-54, all subjects being fertile and sexually active, were examined for the first time at St. Anna Hospital in Turin for the diagnosis of sexually transmitted diseases (STDs). A total of 5559 unselected patients were divided into 2 groups according to the presence (1721) or absence (3838) of subjective symptoms related to PID. Both groups underwent a cervico-vaginal bacteriological test for common pathogens, Candida spp., T. vaginalis, bacterial vaginosis, C. trachomatis, Mycoplasma spp., N. gonorrhoeae. The prevalence of each micro-organism was coupled with the anamnestic data collected from a pre-determined questionnaire submitted to all patients. The questionnaire collected personal data: age at the time of first sexual intercourse; the number of partners in the last 6 months; the type of contraceptives used. Statistical analysis was performed using a chi squared test. RESULTS: In our analysis 2 factors proved to be decisive for a correct PID diagnosis: a subjective symptomatology and an anamnesis mainly focused on risk factor evaluation. This result is in accordance with what has been emphasized many times in the literature, i.e. many of these infections have only a few or no symptoms at all. CONCLUSION: Greater attention to the anamnestic data collection would therefore be the key to focusing the clinical investigations on those who are at a major risk to contracting STDs.

Adolescent↗
PubMed2004

Chlamydia trachomatis prevalence in North-West Italy.

AIM: Chlamydia (C.) trachomatis infection is the most common sexually transmitted disease (STD) among sexually active adolescents and young adults in Europe. The aim of this study was to determine the prevalence of C. trachomatis among sexually active women in Piedmont, Italy and the correlation between some risk factors and C. trachomatis infection. METHODS: In our study 31,419 sexually active women aged 12-55 were screened for C. trachomatis by Abbott's ligase chain reaction (LCR) using cervical swabs during the period 1997-2001 at St. Anna Obstetric-Gynecological Hospital, Turin. All the patients answered a specific questionnaire. RESULTS: In our analysis the prevalence of C. trachomatis infection was found to be 1.23%, and the average age among the infected patients was 36.98 years. Statistical analysis was performed using the chi squared test; a p<0.05 was considered significant. A correlation was found between a positive test result and the age at the first intercourse (p<0.001), the number of sexual partners in the preceding 6 months (p<0.001), the presence of symptoms (p<0.001), a low level of education (p<0.001) and an East-European and Central-Northern African citizenship (p<0.001). No statistically significant differences were found among the contraceptive methods used, whether an hormonal or a barrier type; a marked increment of the risk was observed when no contraception was used. CONCLUSION: Frequent microbiological examinations are desirable for patients whose anamnesis shows an augmented risk of contracting sexually transmitted infections in order to avoid long term complications from misdiagnosed or asymptomatic pathologies, as often happens with C. trachomatis.

Adolescent↗
PubMed2001

Aberrant activation of c-kit protects colon carcinoma cells against apoptosis and enhances their invasive potential.

Multiple genetic aberrations contribute to the development of biologically aggressive, clinically malignant colorectal carcinomas (CRCs). Some of these have been linked to inappropriate signaling through the tyrosine kinase moieties of growth factor receptors. We have described previously (G. Bellone et al., J. Cell. Physiol., 172: 1-11, 1997) that human CRCs overexpress both the receptor tyrosine kinase c-kit and its ligand, stem cell factor (SCF), relative to normal mucosa cells, thus establishing an autocrine c-kit-mediated loop. In addition, we noted that exogenous SCF contributes to anchorage-independent growth of HT-29 colon carcinoma cells in semisolid medium. Here, we investigated possible roles of the c-kit/SCF autocrine/paracrine system in survival and invasive capacity of DLD-1 colon carcinoma cells. We report that SCF was required for migration and invasion of DLD-1 cells through reconstituted basement membranes (Matrigel) and up-regulated gelatinase (matrix metalloproteinase-9) activity in DLD-1 cells. Furthermore, we describe that SCF supported survival of DLD-1 cells in growth factor-deprived conditions. These results suggest multiple roles of c-kit activation in support of the malignant phenotype of DLD-1 cells related to growth, survival, migration, and invasive potential.

Antibodies, Monoclonal↗
PubMed2001

Differential expression of transforming growth factors-beta1, -beta2 and -beta3 in human colon carcinoma.

Transforming growth factor (TGF)-beta is a protein family which affects multiple cellular functions including survival, proliferation, differentiation and adhesion. Among the three known isoforms, TGF-beta1 is commonly overexpressed in solid malignancies. Recent studies in knock-out mice demonstrated non-redundant roles of different TGF-beta isoforms in development. The present study was performed to assess tumour-associated expression of the three TGF-beta isoforms in colon carcinoma. We report that colon carcinoma progression is associated with gradual and significant increases in expression of TGF-beta1 and TGF-beta2 mRNA and proteins. By contrast, TGF-beta3 expression was detected in normal colonic mucosa and, at slightly higher levels, in tumour tissues. In addition, plasma levels of both TGF-beta1 and TGF-beta2 were significantly higher in cancer patients when compared with unaffected individuals. Taken together, our results indicate distinct expression patterns of the three TGF-beta isoforms in colon carcinoma cells and possible systemic effects of TGF-beta1 and TGF-beta2 in tumour patients.

Adult↗
PubMed2001

[The pro-apoptotic factors Fas Ligand and Trail. Molecular mechanisms, physiopathological role and therapeutic potential].

Programmed cell death, also known as apoptosis, is a normal physiologic process which occurs during embryonic development as well as in maintenance of tissue homeostasis. Increasing evidence suggests that alterations in cell death contribute to the pathogenesis of a number of human diseases, including cancer, viral infections, autoimmune diseases and acquired immunodeficiency syndrome (AIDS). The extraordinary research activity of the past few years has resulted in the characterization of the principal proteins involved in the apoptosis machinery. An area of particular interest has been the induction of apoptosis by two death receptor/ligand pairs, Fas/Fas Ligand and DR4-DR5/TRAIL. The identification of these molecules with the recruited signaling pathways could clarify their physiopathological implications, having a significant impact upon potential therapeutic interventions in diseases associated with cell survival alterations.

Animals↗
PubMed2000

Production and pro-apoptotic activity of soluble CD95 ligand in pancreatic carcinoma.

We report here that the progression of pancreatic carcinomas in tumor patients is associated with increased serum levels of both the soluble forms of CD95 ligand (CD95L/FasL) and its receptor, CD95 (Fas). Shedding of proteolytically processed soluble CD95L was also observed in pancreatic carcinoma cells in vitro, thus identifying one possible source of CD95L in patients' sera. Because the secreted forms of both CD95 and CD95L have been implicated previously in protection of cells from CD95-mediated cell death, we assessed the effect of soluble CD95L in supernatants of pancreatic carcinoma cells on viability of Jurkat T lymphocytes. We describe that (a) supernatants derived from cultured pancreatic carcinoma cells caused apoptosis of Jurkat cells; (b) soluble tumor-derived CD95L contributed significantly to this effect; and (c) in comparison to Jurkat cells, pancreatic carcinoma cells themselves revealed increased resistance to apoptosis induction by autocrine soluble CD95L. These results are consistent with the notion that in the microenvironment of pancreatic tumors, tumor-derived shed CD95L exerts paracrine pro-apoptotic effects. In addition, because it is released at high levels into the bloodstream, soluble CD95L may have systemic effects in tumor patients that reach beyond the microenvironment of the tumor site.

Adult↗
PubMed1999

[High serum levels of Transforming Growth Factor-beta1, Interleukin-10 and Vascular Endothelial Growth Factor in pancreatic adenocarcinoma patients].

BACKGROUND: Pancreatic adenocarcinomas are among the most aggressive types of cancer with an extremely poor diagnosis. Since this type of cancer is not well amenable to chemo- and radiotherapy or immunotherapy, surgical resection remains the only feasible treatment to date. Transforming Growth Factor (TGF)-beta and Interleukin (IL)-10 are potent immunomodulators that have been shown to suppress several aspects of the immune response. Vascular Endothelial Growth Factor (VEGF) is a powerful angiogenic factor, recently thought to be involved in neoangiogenesis and metastasis spreading. Therefore the three cytokines may contribute, by different pathways, to immune escape and growth of tumor. This study was conducted to determine the possible significance of TGF-beta1, IL-10 and VEGF as markers for monitoring the clinical course of pancreatic adenocarcinoma patients. METHODS: Cytokine serum levels were measured in 30 pancreatic cancer patients and in 30 age and sex-matched healthy subjects. RESULTS: In comparison to serum concentrations in controls, TGF-beta1, IL-10 and VEGF levels were significantly elevated in all patients. Where the patients were divided by groups on the basis of the clinical stage of the disease, no differences were observed in TGF-beta1 levels among the groups. On the contrary, IL-10 and VEGF were more represented in stage IV patients than in stage II and III patients. In addition, the 14 patients who underwent surgical resection had postoperative cytokine serum levels markedly lower than those observed at diagnosis. CONCLUSIONS: Overall, the results suggest the importance of these markers in predicting the biological activity of the disease and suggest new targets for future rational therapies.

English Abstract↗
PubMedDate not supplied

[Vascular endothelial growth factor. From basic research to clinical application].

There is increasing evidence to support the concept that growth and metastasis of solid tumors, including those of gastrointestinal tract, is facilitated by neoangiogenesis. Vascular Endothelial Growth Factor (VEGF) is one of the most powerful known inducer of endothelial cell growth. Therefore, VEGF is likely to contribute to tumor growth by promoting angiogenesis and stroma formation both directly, through its neovascularization inducing activity, and indirectly, by increasing vascular permeability. In addition, VEGF facilitates tumor diffusion favouring metastatic spread of cancer cells. In view of these implications, it is important to understand the physiopathological role played by this factor. In this review the authors present the accumulating body of data on the biological and functional properties of VEGF, paying special reference to new evidence on its contribution in tumor immune escape, through a marked inhibition of differentiation and activity of the professional antigen presenting cells (APC), namely dendritic cells (DC). As the molecular and cellular events that underlie the functional role of VEGF in tumor angiogenesis and immune suppression become better defined, rational pharmacological and/or gene therapies can be derived in order to treat those neoplasms, such as pancreatic adenocarcinoma, not well amenable to chemo- and radiotherapy or immunotherapy.

Dendritic Cells↗
PubMedDate not supplied

[The surgical treatment of lung metastases. The prognostic factors and the indications for the surgical approach].

BACKGROUND: After the liver, the lungs represent the most frequent site of metastasis from primary tumours. Surgical treatment of lung secondary neoplasms leads to a significant improvement in survival. METHODS: Between 1960-1997, 178 patients with lung metastases underwent surgery at the Thoracic Surgery Department of Turin University in a total of 193 operations. A retrospective study was made in order to identify the prognostic factors which influenced final survival in this population. RESULTS: Overall survival was 47% after 2 years and 20% after five years. Prognosis was not influenced by the size of metastases, the type of surgery, adjuvant therapy and the number of operations on the same patient. On the other hand, useful prognostic factors were found to be the histological type of the primary tumour, the original site of the neoplasm, the number of metastases and, above all, the disease-free interval (DFI). CONCLUSIONS: Lung metastasectomy is an important therapeutic aid in selected patients, whereas the preoperative evaluation of the above prognostic factors enables a reasonably precise prognosis to be made in most patients.

Adolescent↗