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Biomedical subjects

C Buttinelli

Publications and source records attributed to C Buttinelli.

At least 19 recordsLinked to original sources
PubMed2003

Can the Expanded Disability Status Scale be assessed by telephone?

Information from patients who are unable to continue their visits to a study centre may be of major importance for the interpretation of results in multiple sclerosis (MS) clinical trials. To validate a questionnaire based on the Expanded Disability Status Scale (EDSS), patients in five different European centres were assessed independently by pairs of trained EDSS raters, first by telephone interview and a few days later by standardized neurological examination. Seventy women and 40 men with an average age of 43.7 years (range 19-74 years) were included in the study. Mean EDSS score at the last visit was 4.5 (0-9). EDSS assessment by telephone was highly correlated with the EDSS determined by physical examination (Pearson's correlation coefficient = 0.95). An intraclass correlation coefficient (ICC) of 94.8% was found for the total sample; 77.6% and 86%, respectively, for patients with EDSS < 4.5 (n = 46) and > 4.5 (n = 64). Kappa values for full agreement were 0.48; for variation by +0.5 steps and +1.0 steps, 0.79 and 0.90, respectively. Best agreement could be found in higher EDSS scores, where assessment by telephone interview might be needed most. The telephone questionnaire is a valid tool to assess EDSS score in cases where the patient is unable to continue visiting a study centre or in long-term follow-up of trial participants.

Adult↗
PubMed2002

A 6-year clinical and MRI follow-up study of patients with relapsing-remitting multiple sclerosis treated with Interferon-beta.

There are few long-term clinical and magnetic resonance imaging (MRI) data on patients treated with interferon-beta (IFN-beta) for relapsing-remitting multiple sclerosis (RRMS). The aim of this study was to provide clinical and MRI data on 68 patients with RRMS treated over a 6-year period and to investigate whether a baseline MRI predicts their long-term clinical and MRI outcome. Six MRI scans were performed monthly before treatment and a further 13 scans were performed during treatment with IFN-beta, the last of which 6 years after commencement of treatment. The relapse rate, disability as measured by the Expanded Disability Status Scale (EDSS), and MRI parameters, including Gd-enhancing lesion load (Gd-LL), T2 hyperintense lesion load (T2-LL) T1 hypointense lesion load (T1-LL) and supratentorial brain volume (SBV) were measured throughout the study. The mean annual relapse rate over the 6 years was 0.52 (SD 0.67), which is significantly lower (68.6%) than the mean annual relapse rate of 1.6 observed during the 2-year period before the commencement of treatment (P < 0.01). The median EDSS score increased from 2 to 2.5, remaining stable in 60% of the patients. From the baseline scan to the final scan, there was a median increase of 7% in the T2-LL and 23.9% in the T1-LL, whilst SBV decreased by 2.7%. The increase in the EDSS over the course of the study was significantly correlated with a reduction in brain volume (r = 0.46, P = 0.001). Greater brain damage at baseline, as measured by both T2-LL and T1-LL, was significantly associated with an increase in disability over the 6 years (r = 0.44, P = 0.0009; r = 0.50, P = 0.0007, respectively). This study shows a sustained effect of IFN-beta on the relapse rate, which is lower than during the 2 years before treatment commencement. More than half the patients showed an improvement or stabilization in the EDSS score. The increment in disability was correlated with the development of brain atrophy but not with increases in lesion burden. Finally, the finding that the extent of lesion burden at the baseline was a strong predictor of increasing disability suggests that IFN-beta treatment might have a moderate effect in modifying the multiple sclerosis (MS) disease course over 6 years unless preventive treatment is started early.

Adjuvants, Immunologic↗
PubMed2001

T cell response to N-formylated peptides in humans.

We present the first evidence of a T lymphocyte response to N-formylated peptides in humans. N-formylated peptide sequences from self (mitochondrial) and foreign (microbial) antigens were used to isolate antigen-specific T cell clones from healthy individuals, including a set of monozygotic twins. The observed response differed from that previously described in mouse (CD4(+) phenotype and MHC class II restriction in humans vs. CD8(+) phenotype and class I restriction in mice). These lymphocytes produce substantial amounts of IFN-gamma. They were isolated in only one of the monozygotic twins, which suggests that their expansion in the healthy immune repertoire is independent of the genetic background. Our result will help in assessing the relevance of N-formylated peptide-specific T cells in protection against infections within the human immune system.

Adult↗
PubMed2001

Migraine and arterial dissection in a young woman.

Ischemic stroke in young adults is rare (5%-10% of all ischemic strokes) and, in absence of other risk factors, may be associated with migraine. We describe the case of a 34-year-old woman, with a history of migraine without aura, who presented a sudden onset of headache with Horner's syndrome, and in whom neuroimaging showed evidence compatible with fibromuscular dysplasia (FMD) and arterial dissection of the extracranial internal carotid artery (ICA) and the carotid siphon. In our opinion, in young women with a long history of migraine, a careful study of the extracranial and intracranial arteries would be useful, although the cost/benefit ratio does not at present justify such a procedure. Our aim in the future is, therefore, to study a larger sample of migraine patients in order to find those patients who are most at risk of arterial dissection and who should, consequently, be carefully studied.

Adult↗
PubMed2001

A genome screen for multiple sclerosis in Italian families.

We have screened the whole genome for linkage in 40 Italian multiplex families with multiple sclerosis using 322 markers. The GENEHUNTER-PLUS program was used to analyse these data and revealed eight regions of potential linkage where the lod score exceeds the nominal 5% significance level (0.7). No region of linkage with genome-wide significance was identified and none of the markers showed evidence of statistically significant transmission disequilibrium. Overall these results have refined the linkage data relating to this disease in Italians modestly supporting some previously identified areas of interest and helping to exclude others.

Genetic Testing↗
PubMed2000

Myelin basic protein intramolecular spreading without disease progression in a patient with multiple sclerosis.

A case with stable multiple sclerosis (MS) and T cell responses which initially focused on peptide 16-38 of myelin basic protein (MBP) allowed us to investigate the dynamics of the MBP-specific T cell repertoire and its relationship with disease progression. Epitope mapping experiments and T cell receptor usage of MBP-reactive T cell lines (obtained at four distinct time points over a 7-year period) showed a spreading of the response. Transient expansions and persistence of T cells recognizing different MBP epitopes were also detected. The patient's expanded disability status scale and magnetic resonance imaging lesion load remained stable. Our case shows both persistent self-recognitions and determinant spreading in stable MS. This finding suggests that the relationship between dynamics of self-recognition and disease progression is highly complex.

Adult↗
PubMed2000

Global immune disregulation in multiple sclerosis: from the adaptive response to the innate immunity.

Increasing evidences show a global immune disregulation in multiple sclerosis (MS). The possible involvement of myelin and non-myelin (auto-)antigens in the autoaggressive process as well as the disregulation of both adaptive and innate immunity challenge the concept of specific immunotherapy. T cells at the boundary between innate and adaptive immunity, whose immunoregulatory role is becoming increasingly clear, have recently been shown to bear relevance for MS pathogenesis. Global immune interventions (and type I interferons may be considered as such) aimed at interfering with both innate and acquired immune responses seem to be a most promising therapeutic option in MS.

Humans↗
PubMed2000

Compositional bias and mimicry toward the nonself proteome in immunodominant T cell epitopes of self and nonself antigens.

We investigated whether and how molecular mimicry affects the shaping of the helper T cell repertoire. We implemented an algorithm that measures the probability of mimicry between epitopes of known immunogenicity and self or nonself proteomes. This algorithm yields 'similarity profiles', which represent the probability of matching between all contiguous overlapping peptides of the antigen under examination and those in the proteome(s) considered. Similarity profiles between helper T cell epitopes (of self or microbial antigens and allergens) and human or microbial SWISSPROT collections were produced. For each antigen, both collections yielded largely overlapping profiles, demonstrating that self-nonself discrimination does not rely on qualitative features that distinguish human from microbial peptides. However, epitopes whose probability of mimicry with self or nonself prevails are, respectively, tolerated or immunodominant and coexist within the same (auto-)antigen regardless of its self/nonself nature. Epitopes (on self and nonself antigens) can cross-stimulate T cells at increasing potency as their similarity with nonself augments. Mimicry, rather than complicating self-nonself discrimination, assists in the shaping of the immune repertoire and helps define the defensive or autoreactive potential of a T cell. Being a predictor of epitope immunogenicity, it bears relevance to vaccine design.

Algorithms↗
PubMed2000

Dynamics of the reactivity to MBP in multiple sclerosis.

Though many lines of evidence support the importance of myelin basic protein (MBP) in the pathogenesis of experimental autoimmune encephalomyelitis (EAE), its role in multiple sclerosis (MS) is still debated as well as the significance of epitope spreading in disease progression. We characterised the response to MBP in eight MS subjects and three of these were followed over time. In one case, the follow up lasted over a 6-year period. Clonal expansion, clonal persistence and epitope spreading against other MBP determinants was detected irrespective of disease course. In one patient we identified a novel T-cell receptor variable gene (BV28S2) which may be involved in the selection of MBP determinants, as suggested by experiments performed in the presence of mismatched antigen presenting cells (APC) between two subjects compatible for HLA-DR2 subtype but differing for the epitope recognised. Our findings do not sustain a role for the response to MBP effecting on clinical course and suggest that a novel TCR gene may be involved in the recognition of unusual self antigens.

Amino Acid Sequence↗
PubMed1999

Use of Bacille Calmette-Guèrin (BCG) in multiple sclerosis.

We studied the effect of Bacille Calmette-Guerin (BCG) vaccine as an immunomodulator in MS. According to the guidelines for clinical trials in MS, a single crossover, MRI-monitored trial was performed in 14 patients with relapsing-remitting MS. After treatment, MRI activity was significantly reduced. No major adverse effects were reported. Adjuvant therapy with BCG vaccine was safe and merits study in MS.

Adjuvants, Immunologic↗
PubMed1999

T cell response to myelin basic protein before and after treatment with interferon beta in multiple sclerosis.

Studies on the in vivo effects of interferon-beta (IFNbeta) therapy on autoreactive T cells have never been carried out in multiple sclerosis (MS). We investigated the T cell response to myelin basic protein (MBP), before and after IFN-beta therapy, raising MBP-specific T cell lines (TCL) from the peripheral blood of six MS patients with a satisfactory response to the treatment. IFNbeta did not affect the relative frequency and epitope specificity of the TCL. After IFNbeta therapy, the production of interleukin-4 was decreased in MBP-stimulated TCL while the secretion of interferon-gamma was increased in unstimulated TCL. Interleukin-10 and tumor necrosis factor-alpha did not show significant variations. This finding supports recent suggestions about the complexity of the T helper 1/T helper 2 paradigm in MS and other organ-specific autoimmune diseases. In fact, the beneficial effects of IFNbeta do not exclude an immunostimulatory action that may involve potentially autoreactive T cells. This has implications for future treatment options, including combination therapies.

Adult↗
PubMed1999

A major influence of the T cell receptor repertoire as compared to antigen processing-presentation in the selection of myelin basic protein epitopes in multiple sclerosis.

We selected two multiple sclerosis (MS) patients, compatible for HLA-DR2 subtype, and differing for HLA-DM haplotype as well as for the myelin basic protein (MBP) epitope recognized by the vast majority of their T cell lines (TCL) (residues 16-38 and 86-99, respectively). TCL sharing the same restriction element were re-assayed in the presence of reciprocally mismatched antigen-presenting cells (APC). The TCL recognized both the whole MBP and the relevant peptide also in the presence of non-autologous APC, (compatibility for processing, despite a difference in the DM haplotype). The same protocol, performed in serum-free pulsing experiments or in the presence of 'fixed' APC, excluded extracellular processing or mutual T cell presentation, and confirmed the need for MBP processing in our system. The finding, that only TCL recognizing MBP peptide 16-38 (a region not previously related to the DR2 haplotype) used a novel Vbeta, supports the importance of the TCR repertoire over the processing-presentation machinery in the selection of MBP epitopes in MS.

Antigen-Presenting Cells↗
PubMed1998

Serum amyloid A protein is elevated in relapsing-remitting multiple sclerosis.

In multiple sclerosis (MS), the signs of inflammation that can be detected in the central nervous system are not mirrored by unequivocal markers of activation of the immune system in the periphery. We performed a serial monitoring of serum amyloid A protein (SAA), a major acute phase reactant, in peripheral blood of patients with relapsing-remitting MS over a 3-month period. Patients were monitored in parallel with gadolinium-enhanced magnetic resonance imaging (Gd-MRI) of the brain. The results show that signs of ongoing peripheral inflammation, reflected by elevations of SAA levels, can be detected in MS patients.

Adult↗
PubMed1997

HLA-DM polymorphisms do not associate with multiple sclerosis: an association study with analysis of myelin basic protein T cell specificity.

The MHC region on 6p harbors at least one susceptibility gene for multiple sclerosis (MS). Within this region, HLA-DM loci are of interest being involved in class II antigen processing. We investigated the association of HLA-DM polymorphisms with MS. Sixty-three patients with MS and 46 healthy controls from continental Italy were typed for HLA-DM polymorphisms and HLA-DRB1 alleles. Besides, among the donors characterized for the DM polymorphisms, we considered 6 MS patients previously studied for the fine specificity of their MBP-specific T lymphocyte lines (TLL). The frequencies of allelic variants at the DMA and DMB loci were similar between MS patients and controls, even when HLA-DRB1*1501 positive and negative donors were analyzed separately. Patients with predominant responses to different MBP epitopes did not differ for their HLA-DM haplotype while patients with predominant responses to the same MBP epitope could present different HLA-DM haplotypes. HLA-DM polymorphisms do not associate with MS and may not affect specific patterns of T cell responses to MBP.

Adult↗
PubMed1997

Down-regulation of cell-surface CD4 co-receptor expression and modulation of experimental allergic encephalomyelitis.

Pre-immunization with autoantigens confers resistance in experimental models of autoimmune diseases. Since non-self molecules can also be protective, it is conceivable that part of the effect rests on a non-specific attenuation of the immune response. This study is aimed at identifying mechanisms by which pre-immunization with a moiety suspended in incomplete Freund's adjuvant (IFA) protects from experimental allergic encephalomyelitis (EAE). Lewis rats were immunized with each of either concanavalin A, lipopolysaccharide, bovine serum albumin, 70 or 65 kDa heat shock proteins, or myelin basic protein. All moieties were given in IFA 3 weeks prior to EAE induction. Serial cytofluorimetric monitoring of B cells and of the alpha beta TCR+, CD4+, CD8+, CD45high and CD45low cells was performed. IFN-gamma and IgG1 production was evaluated in parallel. All moieties were able to attenuate or abrogate the clinical signs of EAE. At day 4 and 10 after EAE induction, the surface expression of the CD4 molecule was down-regulated on T lymphocytes. This down-regulation was most evident in animals with the highest degree of clinical protection. By day 21 post-immunization, CD4 expression was restored. The same animals also showed an increase in the B cell percentage and Th2-related IgG1 production while IFN-gamma secretion was reduced. Pre-immunization with diverse antigens suspended in IFA confers resistance to EAE induction. The down-regulation of the CD4 co-receptor accompanied by events suggestive of an immune deviation may be a general mechanism that contributes to the protection.

Animals↗