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M Luomala

Publications and source records attributed to M Luomala.

12 recordsLinked to original sources
PubMed2006

Effects of oxidized low- and high-density lipoproteins on gene expression of human macrophages.

OBJECTIVE: Oxidized low-density lipoprotein (ox-LDL) is a major factor in foam cell formation, whereas the role of oxidized high-density lipoprotein (ox-HDL) in this process is not known. The objective of the present study was to examine the effects of ox-LDL and ox-HDL on the gene expression of cultured human macrophages. MATERIAL AND METHODS: Gene expression of human macrophages was studied after incubation for 1 day and 3 days with native and oxidized LDL and HDL using cDNA expression array. Expression of granulocyte-macrophage colony-stimulating factor 1, which was constantly up-regulated by ox-LDL and down-regulated by ox-HDL after 1- and 3 days of incubation in cDNA microarray experiments, was verified by quantitative reverse transcriptase-polymerase chain reaction (RT-PCR). RESULTS: Genes that showed altered expression were divided into six groups; 1) lipid metabolism, 2) inflammation, growth and hemostasis, 3) matrix metalloproteinases and tissue inhibitors of matrix metalloproteinases, 4) enzymes, 5) structural and binding proteins and 6) annexins. CONCLUSIONS: The microarray method was found to be applicable in analyzing changes in gene expression induced by oxidized lipoproteins in cultured human macrophages. Our results reflect different functional roles of ox-LDL and ox-HDL in foam cell formation.

Base Sequence↗
PubMed2004

Increase in CCR5 Delta32/Delta32 genotype in multiple sclerosis.

Chemokines and their receptors participate in the development of multiple sclerosis (MS) by guiding immune cells into the brain tissue. A CCR5 Delta32 deletion mutation abolishes functional CCR5 on the cell surface and may reduce cell entry into the lesion sites. To analyse the significance of this mutation in MS, we compared the frequencies of CCR5 genotype in peripheral blood mononuclear cells from 89 MS patients and 119 healthy controls. The CCR5 genotype was further compared with the CCR5 RNA and surface protein expression in 48 MS patients and their controls. In all MS patients, the Delta32/32 genotype was found with 6.7% frequency, whereas it was present only in 0.8% of the controls (6/89 vs 1/119, P = 0.01). Specifically, the Delta32/Delta32 genotype was increased (11.5%, P = 0.05) among primary progressive MS patients, whereas it was present only in 4.8% in other MS subtypes and only in 0.8% of the controls. The amount of CCR5 protein on CD4(+) cells analysed in 48 MS patients (nine primary progressive MS, 18 secondary progressive MS, 21 relapsing-remitting MS) and 13 controls decreased with genotype, being 8.9% in wt/wt, 7.7% in wt/Delta32 and 4.3% in Delta32/Delta32. CCR5 surface expression analysed on these 48 MS patients and 13 controls was significantly decreased in Delta32/Delta32 MS patients as compared with that in wt/wt genotype individuals (P = 0.004). The significantly increased number of Delta32/Delta32 individuals among our MS patients suggests that this genotype could contribute as a general risk factor for MS. However, neither the levels of RNA or surface protein correlated with MS subtype, neurological disability as expressed by expanded disability status scale, or disease progression index. Our results suggest that the lack of CCR5 does not protect from MS, but rather it may predispose to the chronic course of the disease. This would further imply that in view of the redundancy in the chemokine system, CCR5 ligands must be assumed to function through other closely related chemokine receptors.

Adult↗
PubMed2003

Promoter polymorphism of IL-10 and severity of multiple sclerosis.

Functional polymorphisms of the genes for interleukin-10 (IL-10; promoter position -1082), chemokine receptor-5 (CCR5 32 bp deletion), tumor necrous factor-alpha (TNFalpha promoter position -308) and cytotoxic T-lymphocyte antigen-4 (CTLA-4 exon 1 position 49) were investigated for possible influence on susceptibility and outcome of multiple sclerosis (MS). The polymorphisms were typed by polymerase chain reaction based methods or by direct sequencing in MS patients (n=93-116) and controls (n=109-400). The studied genes were not associated with MS susceptibility. Patients were classified as suffering from a mild/moderate [Expanded Disability Status Scale (EDSS) 0-5.5] or severe (EDSS 6-8.0) form of MS. The AG genotype of IL-10 proved to be protective against severe MS in all patients (OR=0.32, P=0.010), the effect being increased over the years (10 years; OR=0.33, P=0.043, 15 years; OR=0.21, P=0.025 or 20 years; OR=0.14, P=0.026). Our results suggest that differential production of IL-10 might be a factor in the severity of MS.

Adult↗
PubMed2001

A study of interleukin-1 cluster genes in susceptibility to and severity of multiple sclerosis.

In this explorative study, interleukin-1 (IL-1) receptor antagonist (IL-1RA; polymorphism of variable number of tandem repeats: VNTR), IL-1alpha (-889), IL-1beta (-511) and IL-1beta (+3953) polymorphisms were studied in relation to susceptibility to and severity of multiple sclerosis (MS), in 93 MS patients and 400 normal controls. No associations were found for any polymorphisms, alone or in combination. However, in our MS cohort, females were found to be IL-1RA allele 2 carriers more frequently than males (33/49 vs. 16/44, p = 0.0028). Using a cohort of 109 controls, IL-1RA allele 2 carriers were more frequently women with MS than control women (33/49 vs. 23/43, odds ratio (OR) = 2.19, 95% confidence interval (CI) 1.02-4.72, p = 0.043, P(C) = ns). The data suggest that the IL-1 cluster genes make no major contribution to MS, but the tentative association between IL-1RA allele 2 and susceptibility of MS in women warrants further studies.

Adult↗
PubMed2001

The combination of HLA-DR1 and HLA-DR53 protects against MS.

The DRB1/3/4/5 loci from 97 patients with MS and 100 normal control subjects were analyzed. DRB1*15 increased the risk of MS (OR = 4.2, p < 0.0001), whereas DR1 decreased the risk (OR = 0.30, p(c )= 0.005). In analyses of the DR1 risk in relation to DR51, DR52, and DR53 alleles, DR1 in combination with DR53 was found to have the strongest protective effect against MS in all subjects (OR = 0.05, p < 0.0001) and in DRB1*15-negative subjects (OR = 0.09, p(c )= 0.026). DR53 may be an important allele or haplotype, acting together with DR1 to protect against MS.

Adult↗
PubMed2000

Plasminogen activator inhibitor 1 gene and risk of MS in women.

In view of the potential importance of the proteolytic mechanisms in the evolution of MS lesions, the authors studied the 4G/5G promoter polymorphism of the plasminogen activator inhibitor 1 (PAI-1) gene in the susceptibility of MS. The 5G5G genotype was associated with MS in women at an odds ratio of 2.3 (95% confidence interval, 1.04 to 5.23). The genotype seems to be a low producer of PAI-1, suggesting that reduced capacity for proteinase inhibition may be involved in the etiopathogenesis of MS in women.

Adult↗
PubMed2000

Adhesion molecules in multiple sclerosis: relation to subtypes of disease and methylprednisolone therapy.

OBJECTIVES: To determine levels of adhesion molecules in blood and cerebrospinal fluid (CSF) samples from patients with different subtypes and activities of multiple sclerosis (MS) and to assess the effect of intravenous methylprednisolone sodium succinate treatment on the levels of soluble adhesion molecules. DESIGN: The expressions of very late activation antigen 4 (VLA-4), lymphocyte function associated antigen 1 (LFA-1), vascular cell adhesion molecule 1 (VCAM-1), and intercellular adhesion molecule 1 (ICAM-1) were determined immunocytochemically, and levels of soluble VCAM-1, ICAM-1, and E-selectin, by means of enzyme immunoassay technique. The volumes of T2- and T1-weighted MS plaques and brain atrophy were determined by means of the semiautomatic magnetic resonance imaging (MRI) segmentation technique. SETTING: A university hospital in Finland. PATIENTS: One hundred subjects (71 patients with MS and 29 healthy control subjects). The subtypes of MS were relapsing-remitting (RRMS [n = 26]), secondary progressive (SPMS [n = 20]), and primary progressive (PPMS [n = 25]). RESULTS: In patients with RRMS and SPMS, the expressions of VLA-4 and LFA-1 on immune cells from blood were at least 1.5- to 3-fold higher than in controls (RRMS, P = .002 and P<.001, respectively; SPMS, P = .03 and P =.001, respectively). In RRMS, LFA-1 and ICAM-1 expression in blood was more up-regulated than in SPMS (P = .03 and P = .01, respectively). The expressions of adhesion molecules on CSF lymphocytes in RRMS and SPMS were of similar magnitude, but the proportions of CSF VLA-4- and LFA-1-expressing lymphocytes were 3- to 4-fold higher than in controls (P = .04 and P = .008, respectively). The levels of serum soluble VCAM-1 were higher in SPMS than in RRMS (P = .005) or PPMS (P = .04). Intravenous methylprednisolone treatment of patients with RRMS in exacerbation caused a significant reduction in the serum levels of soluble VCAM-1 and E-selectin (P<.001). In SPMS, the volumes of T2-weighted plaques correlated with the serum level of soluble ICAM-1 (r = 0.64; P = .03). CONCLUSIONS: Up-regulated adhesion molecules in blood and CSF indicate sustained potential for inflammation in the CNS throughout the clinical spectrum of MS. Therapies interfering with cell adhesion may be of key importance in suppressing MS.

Adult↗
PubMed1996

Inhibition by fenamates of calcium influx and proliferation of human lymphocytes.

1. Flufenamic and tolfenamic acids have recently been shown to inhibit receptor-mediated calcium influx in human neutrophils. The present work was designed to study the effects of these two nonsteroidal anti-inflammatory drugs on human peripheral blood lymphocyte activation. 2. Peripheral blood mononuclear cells (PBMNCs; containing 90% lymphocytes) were stimulated by mitogen concanavalin A (Con A) or by a combination of an inhibitor of microsomal Ca(2+)-adenosine triphosphatase thapsigargin (TG) and phorbol myristate acetate (PMA). The effects of the two fenamates on cell proliferation were compared with respective changes in calcium metabolism. 3. Flufenamic and tolfenamic acids (10-100 microM) inhibited both Con A and TG + PMA-induced [3H]-thymidine incorporation in a dose-dependent manner. At the same concentration range, the two fenamates inhibited the increase in intracellular free calcium concentration induced by Con A or TG + PMA. This effect was due to inhibition of calcium influx whereas calcium release from intracellular stores remained unaltered. 4. The inhibition of divalent cation influx was confirmed by showing that fenamates inhibited TG + PMA-induced Mn2+ influx. 5. The inhibitory effects of fenamates on PBMNC proliferation and Ca2+ influx were qualitatively similar with those of SK&F 96365, an earlier known inhibitor of receptor-mediated calcium entry. Ketoprofen, a chemically different prostaglandin synthetase inhibitor did not show similar suppressive effects on PBMNCs. 6. The data suggest that flufenamic and tolfenamic acids suppress proliferation of human peripheral blood lymphocytes by a mechanism which involves inhibition of Ca2+ influx and is not related to inhibition of prostanoid synthesis.

Analysis of Variance↗
PubMed1995

Improved immunogenicity of oral D x RRV reassortant rotavirus vaccine by Lactobacillus casei GG.

In a search for new strategies to improve oral vaccination, the effect of orally administered Lactobacillus casei strain GG (LGG) in conjunction with D x RRV rhesus-human reassortant live oral rotavirus vaccine was tested in 2-5-month-old infants. Infants who received LGG showed an increased response with regard to rotavirus-specific IgM secreting cells, measured using an ELISPOT technique, on day 8 after vaccination. In infants receiving LGG or placebo, respectively, a rotavirus IgM seroconversion was detected in 26/27 (96%), versus 23/27 (85%) cases (p = 0.15) and rotavirus IgA seroconversion was detected in 26/28 (93%) versus 20/27 (74%) cases (p = 0.05). These findings suggest that LGG has an immunostimulating effect on oral rotavirus vaccination. The clinical significance of LGG-enhanced immune responses to oral vaccines should be further evaluated.

Administration, Oral↗
PubMed1983

Progression of chronic renal failure.

The different modes of progression of renal diseases were studied in 73 patients by plotting the reciprocals (1/SCr) and logarithms (logSCr) of their serum creatinine values against time. The regression was linear in the reciprocal plot for 42 patients (57.5%) and in the logarithmic plot for 12 patients (16.4%). The type of renal disease did not predict the mode of progression. The deviations from the linear regression lines were probably most often due to changes in the level of blood pressure and to intensification of treatment for hypertension. The reciprocal plot turned out to be useful for predicting the date when end-stage renal failure was reached. An accuracy of 4 months was reached in 81.5% using the reciprocal plot but only in 25.9% using the logarithmic plot.

Adult↗