Biomedical subjects

S Losito

Publications and source records attributed to S Losito.

12 recordsLinked to original sources

PubMed2007

Development of leiomyosarcoma of the uterus in MMTV-CR-1 transgenic mice.

Overexpression of Cripto-1 (CR-1) in FVB/N mice using the MMTV-LTR promoter results in increased mammary tumourigenesis in these female transgenic mice (MMTV-CR-1). Here, we characterize uterine tumours that developed in 15/76 (19.7%) of MMTV-CR-1 female nulliparous or multiparous mice during 24 months of observation compared with 0/33 (0%) of FVB/N normal control mice observed during the same time period (p < 0.01). The uterine tumours collected from the MMTV-CR-1 mice were classified as leiomyosarcomas and found to express the CR-1 transgene by polymerase chain reaction analysis and immunohistochemistry. Detection by western blot analysis showed higher levels of phosphorylated (P) forms of c-src, Akt, GSK-3beta, and dephosphorylated (DP)-beta-catenin in lysates from MMTV-CR-1 uterine leiomyosarcomas in comparison with lysates from normal control FVB/N uteri. Immunostaining showed increased nuclear localization of beta-catenin in the MMTV-CR-1 uterine leiomyosarcomas. Increased immunostaining for CR-1 was detected in 9/13 (69.2%) cases of human leiomyosarcoma compared with staining in 3/15 (20%) human leiomyoma sections. Stronger immunostaining for P-src, P-Akt, P-GSK-3beta and increased nuclear localization of beta-catenin was also seen in human leiomyosarcomas in comparison with leiomyomas. Normal human uterine smooth muscle (UtSM) cells treated with exogenous soluble rhCR-1 showed increased levels of P-src, P-Akt, P-GSK-3beta and dephosphorylated (DP)-beta-catenin and increased proliferation (p < 0.05) and migration (p < 0.01) in comparison with untreated control UtSM cells. Inhibitors against c-src, Akt or beta-catenin, individually or in combination, significantly reduced CR-1-induced migration. These results suggest a role for CR-1 during uterine tumourigenesis either directly by activating c-src and Akt and/or via cross-talk with the canonical Wnt signalling pathway, as suggested by the increased expression of P-GSK-3beta, DP-beta-catenin, and increased nuclear localization of beta-catenin in human and MMTV-CR-1 mice leiomyosarcomas.

Animals↗

PubMed2003

PCR assay to detect Bacillus anthracis spores in heat-treated specimens.

Recent interest in anthrax is due to its potential use in bioterrorism and as a biowarfare agent against civilian populations. The development of rapid and sensitive techniques to detect anthrax spores in suspicious specimens is the most important aim for public health. With a view to preventing exposure of laboratory workers to viable Bacillus anthracis spores, this study evaluated the suitability of PCR assays for detecting anthrax spores previously inactivated at 121 degrees C for 45 min. The results indicate that heat treatment ensures the complete inactivation of B. anthracis spores without significantly affecting the efficiency of PCR assays.

Bacillus anthracis↗

PubMed2001

Detection of anthrax vaccine virulence factors by polymerase chain reaction.

In Italy, an attenuated Bacillus anthracis strain, named 'Carbosap', is used for immunization against ovine and bovine anthrax. Analysis on 'Carbosap', Sterne vaccine strain F34 and Pasteur vaccine strain SS104, were performed using primers specific for the sequences, encoding the toxic factors, located on plasmids pXO1 and pXO2 and primers specific for the chromosome. The results obtained from polymerase chain reaction (PCR) assay revealed the presence of both plasmids pXO1 and pXO2 in 'Carbosap' strain. This study showed that the 'Carbosap' vaccine strain has a different plasmid pattern in comparison to Pasteur vaccine strain SS104 and Sterne vaccine strain F34.

Animals↗

PubMed2001

Ischemic colitis associated with paclitaxel.

Systemic chemotherapy can be complicated by colonic toxicity, which usually determines the onset of pseudomembranous colitis and, rarely, of ischemic colitis in patients with cancer. This report describes the case of a 49-year-old woman with liver metastases from a neuroendocrine tumor of unknown origin who developed mild ischemic colitis after chemotherapy with carboplatin and paclitaxel. The patient developed symptoms of gastrointestinal toxicity with abdominal pain and bloody diarrhea, which resolved in about 10 days. She had a normal white blood cell count throughout her illness; the assay of stool specimens for Clostridium difficile toxins and the stool cultures were both negative. A sigmoidoscopy showed a mild, transient ischemic colitis, which was confirmed by pathologic examination of the biopsy specimens. Although carboplatin is not related to severe colonic cytotoxicity, it has been previously reported that paclitaxel induces necrosis of the gastrointestinal mucosa and inhibits angiogenesis. Pseudomembranous colitis is the most frequent complication in patients with cancer who undergo paclitaxel-based chemotherapy and develop gastrointestinal toxicity. Once C. difficile infection has been excluded, a diagnosis of ischemic colitis should be considered, especially in patients with cancer who have normal white blood cell counts.

Antineoplastic Combined Chemotherapy Protocols↗

PubMed2001

Primary plasmacytoma of the breast.

We describe a solitary extramedullary plasmacytoma of the breast in a 37-year-old woman. No other involvement was detected in the bone marrow or in any other site during a 15-month follow-up period. Extramedullary plasmacytomas of the breast are extremely rare, especially those that are not associated with multiple myeloma. We review the histologic features of the previously reported cases with an emphasis on differential diagnosis and the difficulties encountered in arriving at the correct diagnosis in frozen sections.

Adult↗

PubMed2000

Simultaneous blockage of different EGF-like growth factors results in efficient growth inhibition of human colon carcinoma xenografts.

A majority of human colon carcinomas coexpress the epidermal growth factor (EGF)-related peptides transforming growth factor alpha (TGFalpha), amphiregulin (AR) and CRIPTO-1 (CR). We have synthesized novel, antisense mixed backbone oligonucleotides (AS MBOs) directed against TGFalpha, AR and CR. We screened the EGF-related AS MBOs for their ability to inhibit the anchorage independent growth of GEO human colon carcinoma cells. The MBOs that showed a high in vitro efficacy were then used for in vivo experiments. TGFalpha, AR and CR AS MBOs were able to inhibit the growth of GEO tumor xenografts in nude mice in a dose-dependent manner. Furthermore, the AS MBOs were able to specifically inhibit the expression of the target mRNAs and proteins in the tumor xenografts. A more significant tumor growth inhibition was observed when mice were treated with a combination of the three AS MBOs as compared to treatment with a single AS MBO. Finally, tumors from mice treated with TGFalpha, AR and CR AS MBOs showed a significant reduction of microvessel count, as compared with tumors from untreated mice or from mice treated with a single AS MBO. These data suggest that combinations of AS oligonucleotides directed against different growth factors might represent a novel, experimental therapy approach of colon carcinomas.

Amphiregulin↗

PubMed2000

Granular cell tumors of the colon: report of a case and review of the literature.

Granular cell tumors are uncommon, usually benign tumors that can be located anywhere in the body. They commonly occur in the oral cavity and in subcutaneous tissue. In the gastrointestinal tract, granular cell tumors are uncommon and are quite rare in the colon. To date, 55 patients diagnosed with granular cell tumors of the colon have been reported in the literature, only 15 had multiple tumors. We describe the case of a 38-year-old man with a family history of colon cancer who was diagnosed with multiple colonic granular cell tumors after a screening colonoscopy. This seems to be the first report of this type. However, in our patient, the diagnosis of colonic granular cell tumors was incidental and there is no data that correlates adenomas or colorectal cancer with granular cell tumors of the colon. Finally, since granular cell tumors are usually benign, we suggest a conservative approach to patients with multiple granular cell tumors of the colon by means of endoscopic resection and a strict endoscopic follow-up.

Adult↗

PubMed2000

In vivo effects of recombinant-interferon-beta1b treatment on polymorphonuclear cell and monocyte functions and on T-cell-mediated antibacterial activity in patients with relapsing-remitting multiple sclerosis.

Treatment with Interferon (IFN)-beta has been proposed as a therapeutic approach in multiple sclerosis (MS) patients, mostly in view of its immunomodulating actions. At the same time, evidence has been provided that MS patients exhibit polymorphonuclear cell (PMN) deficits, which can explain the increased susceptibility to infections in these subjects. Here, in 28 patients with relapsing-remitting (RR) MS under treatment with recombinant (r)-IFN-beta PMN polarization and PMN and monocyte (MO) phagocytosis and killing, as well as T-cell mediated antibacterial activity, were evaluated before treatment and over a period of nine months of treatment. Our results point out an enhanced rate of polarization (both "spontaneous" or N-formyl-methionyl-leucyl-phenylalanine-induced) in MS patients. After r-IFN-beta1b treatment the polarization rate was further increased. On the contrary, PMN and MO phagocytosis and killing were depressed in comparison to controls and values were further reduced by r-IFN-beta1b treatment. In patients T-cell mediated antibacterial activity was decreased at T0 and dramatically dropped in the course of r-IFN-beta1b therapy.

Adult↗

PubMed2000

FRA-1 expression in hyperplastic and neoplastic thyroid diseases.

fra-1 gene overexpression has been shown to represent a general event in thyroid cell transformation in vitro and in vivo. Moreover, inhibition of FRA-1 protein synthesis by stable transfection with a fra-1 antisense construct significantly reduces the malignant phenotype of the transformed thyroid cells, indicating a pivotal role of the fra-1 gene product in the process of cellular transformation. In the attempt to define the potential use of FRA-1 protein detection in the diagnosis of thyroid diseases, we analyzed Fra-1 expression by a combination of immunohistochemistry and reverse transcription-PCR (RT-PCR) assay in 174 samples of thyroid nodules (22 nodular hyperplasias, 102 follicular adenomas, 34 papillary carcinomas, 12 follicular carcinomas, and 4 anaplastic carcinomas) representative of the spectrum of thyroid tumor pathology. FRA-1 protein was abundant in all of the carcinoma samples (50/50, 100%), with an intense staining in the nucleus and the cytoplasm. Positive staining was also found in most of the adenomas (90 of 102; 88%), but in this case, the staining was restricted to the nucleus. Similar results were obtained from the analysis of thyroid goiters; however, the number of positive cases is lower than adenomas (8 of 22; 36%); moreover, the staining was not observed in all of the cells. Conversely, no FRA-1 protein was detectable in 12 normal thyroid tissue samples used as controls. RT-PCR analysis confirmed a higher fra-1 expression in papillary and follicular carcinomas compared with goiters and adenomas. fra-1 expression was also analyzed on 10 fine needle aspiration biopsy (FNAB) samples by RT-PCR. fra-1-specific mRNA was detected in seven of the eight FNABs corresponding to thyroid nodules that were eventually diagnosed as adenomas (three of four) and carcinomas (four of four) after surgery. Conversely, no fra-1 gene expression was observed in two FNABs derived from normal thyroid. Further studies are required before suggesting FRA-1 protein detection as a useful tool for the diagnosis of hyperplastic and neoplastic disorders of the thyroid gland.

Biopsy, Needle↗

PubMed1999

EGF-related peptides are involved in the proliferation and survival of MDA-MB-468 human breast carcinoma cells.

A majority of human breast carcinomas co-express the epidermal growth factor (EGF)-like peptides CRIPTO (CR), amphiregulin (AR) and transforming growth factor alpha (TGF-alpha). MDA-MB-468 breast carcinoma cells express CR, AR and TGFalpha, while SK-BR-3 cells express CR and TGF-alpha. Anti-sense phosphorothioate oligodeoxynucleotides (AS S-oligos) directed against either CR or TGF-alpha inhibit the proliferation of both cell lines. A 40-50% growth inhibition was observed at a 2-microM concentration of each AS S-oligo. Treatment with the AR AS S-oligo also resulted in a significant inhibition of MDA-MB-468 anchorage dependent growth (ADG). No significant growth inhibition was observed when MDA-MB-468 or SK-BR-3 cells were treated with a mis-sense S-oligo. The AS S-oligos inhibited the expression of AR, CR or TGF-alpha proteins and mRNAs, as assessed by immuno-cytochemistry and semi-quantitative RT-PCR. An additive growth-inhibitory effect was observed when MDA-MB-468 cells were treated with a combination of EGF-related AS S-oligos. Indeed, treatment of MDA-MB-468 cells with a combination of AR, CR and TGF-alpha AS S-oligos resulted in about 70% growth inhibition at a concentration of 0.7 microM each. Finally, treatment of MDA-MB-468 cells with a combination either of the 3 AS S-oligos or of an EGF receptor-blocking antibody (MAb 225) and either CR, AR or TGFalpha AS S-oligos resulted in a significant increase in DNA fragmentation. Our data suggest that the EGF-related peptides are involved in the proliferation and survival of breast carcinoma cells.

Amphiregulin↗

PubMedDate not supplied

Safety of cisplatin after severe hypersensitivity reactions to carboplatin in patients with recurrent ovarian carcinoma.

BACKGROUND: Carboplatin is a milestone drug against ovarian carcinoma; it is used both in front-line and second-line chemotherapy. Hypersensitivity reactions to carboplatin may occur during the treatment as salvage therapy. The purpose of this study was to describe the feasibility of the replacing of carboplatin with cisplatin in patients presenting with severe hypersensitivity reactions to carboplatin. PATIENTS AND METHODS: Ten consecutive patients with platinum-sensitive, recurrent ovarian carcinoma, presenting with moderate/severe hypersensitivity reactions to carboplatin were treated with cisplatin 60 mg/m2 from January 2000 to December 2002. Hypersensitivity reactions consisted of respiratory distress (chest tightness, wheezing, dyspnea), urticaria/erythema with tachycardia, facial swelling and hypotension. RESULTS: The total number of cisplatin cycles given was 44 (range 2-5). The treatment with cisplatin was generally well tolerated. No serious allergic reactions occurred. A mild allergic reaction was recorded (urticaria) in only one case, after one cycle of cisplatin, and the patient was not rechallenged because of progressive disease. No reductions of chemotherapy doses were needed. CONCLUSION: To date, platinum-based regimens remain the most effective treatment in recurrent platinum-sensitive ovarian cancer with a high rate of objective responses. Although our experience is limited, we suggest that, under anesthesiologic surveillance and providing immunologic blockade, the replacement of carboplatin salvage therapy with cisplatin can be considered a safe therapeutic strategy in patients who cannot continue carboplatin due to allergic reactions.

Aged↗

PubMedDate not supplied

[Salvage surgery in the treatment of massive abdominal recurrence of uterine leiomyosarcoma. Clinical case].

Uterine leiomyosarcomas carry a dismail prognosis. Diagnosis is often an unexpected pathology discovery after hysterectomy for fibroma. Prognosis depends on the degree of locoregional extension and thus on early diagnosis. Extended surgery in case of relapse is sometimes the only possible approach for symptoms control and improvement of quality of life. A case of massive involvement of the abdomen by a relapsed uterine leiomyosarcoma treated by extreme surgery is here presented.

Abdominal Neoplasms↗