PubMed Health⌕ Search

Biomedical subjects

A Hänninen

Publications and source records attributed to A Hänninen.

At least 19 recordsLinked to original sources

High sensitivity measurement of CRP and disease progression in multiple sclerosis.

The authors measured serum C-reactive protein (CRP) serially in patients with multiple sclerosis (MS) who participated the PRISMS study using a high-sensitivity technique. CRP values were similar in patients with MS and in healthy controls but higher during MS relapses than in remission (p = 0.010). CRP levels were lower during treatment with high-dose interferon beta 1a than placebo (p = 0.035) and higher during first 12 months of study in patients who progressed by year 4 compared with stable patients (p = 0.007).

Adult↗

25-Hydroxyvitamin D levels in serum at the onset of multiple sclerosis.

Past sun exposure and vitamin D supplementation have been associated with a reduction in the risk of MS. We measured the serum concentration of 25-hydroxyvitamin D (25[OH]D) at the time of MS diagnosis in 40 MS patients and 40 controls. We found no difference in the serum levels of 25(OH)D between MS patients and controls when all samples or samples obtained during winter months were compared, but MS patients had significantly lower serum 25(OH)D concentrations in June to September than the controls. The vitamin D stores were adequate for bone metabolism (> 37 nmol/L) in 70% of MS patients throughout the year and within the hypovitaminosis level (< 37 nmol/L) in 30% of MS patients at some time of the year. During MS-relapses, 25(OH)D levels were lower than in remission, but mostly within the reference range observed in relation with normal bone metabolism. We conclude that the vitamin D stores in most MS patients are adequate for their normal bone metabolism. However, lower vitamin D levels during MS relapses than in remission suggest that vitamin D could be involved in the regulation of the clinical disease activity of MS. The optimal serum levels of vitamin D for the regulation of immune responses remain to be determined.

Adult↗

Hip fractures in Finland--a comparison of patient characteristics and outcomes in six hospitals.

BACKGROUND AND AIMS: To compare six Finnish hospitals for the quality of treatment of hip fractures and to obtain information for the development of care. MATERIAL AND METHODS: Data of 1179 consecutive hip fracture patients (about 200 patients per hospital) was collected prospectively, using similar standardized forms and focusing on background factors and the four-month functional outcome. RESULTS: There were significant differences between the hospitals in patient characteristics (age, place of residence, walking ability, use of walking aids, morbidity and type of fracture) and in the unadjusted outcome variables at four months' follow-up (place of residence, mobility, use of walking aids and pain in injured hip). After adjustment for baseline characteristics, there was a significant difference in the post-fracture walking ability between the centres but no significant differences in post-fracture place of residence. Unadjusted mortality did not vary between the centres, but adjustment resulted in significant differences. The most marked difference in surgical methods between the hospitals was seen in the use of either sliding hip screw or Gamma Nail for trochanteric fractures, but this difference was not reflected in the results of multivariate analysis. CONCLUSIONS: We found minor differences in mobility and mortality between the participating hospitals, and these might serve them as a stimulus for improving their standard of good practice. Continuous quality improvement by repeating the audit cycle is recommended in order to reach and then improve the prevalent standards in the care of hip fracture patients. Confounding factors should be adjusted when comparing the medical centres treating hip fractures, and the evaluation of the results should be multidimensional.

Arthroplasty↗

IL-10 is highly expressed in the cryptorchid cryptepididymal epithelium: a probable mechanism preventing immune responses against autoantigenic spermatozoa in the epididymal tubule.

The expression of several immunoregulatory adhesion proteins and cytokines was studied in the normal epididymis, cryptorchid cryptepididymis, the epididymis of oestrogen-treated mice and the epididymis of non-obese diabetic (NOD) mice at the protein level to see which of these immunoregulatory proteins may be involved in lymphocyte regulation in the normal or pathological epididymis and if cytokine balance in this organ is on the cellular or humoral side. The aim of the study was to characterize the immunological microenvironment of the epididymis to explain the survival of the autoantigenic spermatozoa in this site. In the 6-week-old BALB/c or NOD mouse epididymis there were some CD18 and CD44 expressing cells in the interstitial tissue. There were no differences between these strains in the expression of the studied antigens, except that some CD4 positive cells were present in the interstitial tissue of BALB/c mice. In the cryptorchid cryptepididymis CD4, CD8, CD18, CD44, CD54 and CD106 expressing cells were occasionally present in the connective tissue surrounding the epididymal tubule. In the epididymis of the oestrogen-treated mice these antigens were not expressed. In the cryptorchid cryptepididymis the epithelial cells expressed IL-10 highly and the myoid peritubular cells IL-6. The present results suggest that the epididymal epithelial IL-10 suppressing TH0, TH1 and TH2 immune responses may be involved in the protection of autoantigenic spermatozoa from immune destruction.

Animals↗

Surgical treatment of resistant tennis elbow. A prospective, randomised study comparing decompression of the posterior interosseous nerve and lengthening of the tendon of the extensor carpi radialis brevis muscle.

We compared decompression of the posterior interosseous nerve (PIN) and lengthening of the distal tendon of the extensor carpi radialis brevis (ECRB) for treatment of tennis elbow in a randomised trial of 28 patients. Fourteen underwent decompression of PIN and 14, lengthening of ERCB. The groups did not differ significantly with regard to age, sex and work activities. The average duration of preoperative symptoms was 23 months. The PIN was exposed in the groove between the brachioradialis and brachialis muscles and decompressed at the arcade of Frohse by means of a 1-2 cm incision through the supinator muscle. The ECRB tendon was lengthened by Z-plasty at the dorsilateral aspect of the forearm. No postoperative complications occurred. The outcome after the primary operation was successful in 50% of the PIN group and in 43% of the ECRB group. Four of the 5 patients with a poor outcome were reoperated in the former group and 3 in the latter. The overall outcome after a mean follow-up of 31 months after the primary operation was successful in 60% of the cases.

Adult↗

Mucosal antigen primes diabetogenic cytotoxic T-lymphocytes regardless of dose or delivery route.

Administration of antigens via mucosal routes, such as orally or intranasally, can induce specific immunological tolerance and has been used as a rational basis for the treatment of autoimmune diseases, including type 1 diabetes. Recently, however, orally delivered antigens were shown to induce CD8 cytotoxic T-lymphocytes (CTLs) capable of causing autoimmune diabetes. In this report, we have examined several mucosal routes for their ability to induce CTLs and autoimmune diabetes, with the aim of identifying approaches that would maximize tolerance and minimize CTL generation. In normal C57BL/6 mice, ovalbumin (OVA) delivered by either the oral or nasal routes or by aerosol inhalation was able to prime CTL immunity in both high- and low-dose regimens. To address the relevance of these CTLs to autoimmune disease, OVA was given to mice that transgenically expressed this antigen in their pancreatic beta-cells. Irrespective of antigen dose or the route of delivery, mucosal OVA triggered diabetes, particularly after intranasal administration. These findings suggest that CTL immunity is likely to be a consequence of mucosal antigen delivery, regardless of the regimen, and should be considered in the clinical application of mucosal tolerance to autoimmune disease prevention.

Administration, Intranasal↗

Gamma delta T cells as mediators of mucosal tolerance: the autoimmune diabetes model.

Mucosal delivery of soluble antigen induces systemic tolerance and has been applied to the prevention of autoimmune diseases. We have studied mucosal tolerance in autoimmune diabetes using the non-obese diabetic mouse model. Treatment of prediabetic mice with the pancreatic islet autoantigen insulin, by aerosol or intranasal delivery, reduces the incidence of diabetes and is associated with induction of CD8 (alpha alpha) gamma delta T cells, small numbers of which prevent adoptive transfer of diabetes. We examine the evidence for gamma delta T cells in mucosal tolerance and discuss possible mechanisms underlying the induction and action of insulin-induced CD8 gamma delta regulatory T cells. CD8 gamma delta cells constitute the most abundant subpopulation of intraepithelial lymphocytes (IELs), the major lymphoid cell compartment and first line of cellular immune defence in the mucosa. Induction of regulatory CD8 gamma delta T cells requires conformationally intact but not biologically active insulin. In contrast, intranasal (pro)insulin peptide, or oral insulin which is degraded in the gut, induces CD4 regulatory cells. Regulatory gamma delta T cells secrete interleukin-10 in pancreatic lymph nodes, which could account for the antidiabetic and bystander suppressor effect of naso-respiratory insulin. The physiological role of gamma delta IELs in maintaining peripheral self-tolerance deserves further study.

Animals↗

Prevention of autoimmune type 1 diabetes via mucosal tolerance: is mucosal autoantigen administration as safe and effective as it should be?

Mucosal immune response to an antigen leads to a state of attenuated systemic response to the same antigen, known as mucosal or oral tolerance. Thus, autoantigen administration via mucosal routes could be useful in the prevention of autoimmune diseases. Although in various models of autoimmune disease it is often effective, in some cases it is ineffective and in other cases even harmful. In these cases it is likely that, concomitantly with tolerance, a productive immune response is induced that exacerbates autoimmunity. Recent evidence suggests that induction of cytotoxic T lymphocytes capable of destroying pancreatic beta cells may be an unavoidable consequence of mucosal administration of pancreatic beta-cell associated autoantigen. To improve the safety and efficacy of mucosal tolerance induction in the prevention of type 1 diabetes, further means to control the induction of cytotoxic T lymphocytes and other potentially tissue-destructive immune effectors may be required.

Administration, Intranasal↗

Mucosal addressin is required for the development of diabetes in nonobese diabetic mice.

Immune responses are best initiated in the environment of lymphoid tissues wherein circulating lymphocytes enter by interacting with endothelial adhesion molecules. In type 1 diabetes, immune responses against pancreatic islets develop, but the environment in which this occurs remains unidentified. To determine whether lymphocyte homing to lymphoid organs is involved in the pathogenesis of diabetes in nonobese diabetic (NOD) mice, we blocked the function of the mucosal addressin cell adhesion molecule-1 (MAdCAM-1), which is a vascular addressin-mediating lymphocyte homing into mucosal lymphoid tissues, in these mice. While ineffective if started later, a blockade started at 3 wk of age reduced the incidence of diabetes from 50% to 9% (p < 0.01). This finding is associated with Peyer's patch atrophy, a marked decrease of naive (CD44(low) CD45RB(high)) T lymphocytes, and a reduction in the relative numbers of memory (CD44(high)) T lymphocytes in the spleen. The potential of these spleen cells to cause diabetes was diminished. Anti-MAdCAM-1 treatment also inhibited both lymphocyte entry into the pancreas and diabetes development in NOD/SCID recipients after the transfer of lymphocytes derived from the mesenteric lymph nodes of young, but not of diabetic, NOD donors. Therefore, MAdCAM-1 may be required during two distinct steps in an early phase of diabetes development: for the entry of naive lymphocytes into the lymphoid tissues in which diabetes-causing lymphocytes are originally primed, and for the subsequent homing of these lymphocytes into the pancreas. The role of MAdCAM-1 as a mucosal vascular addressin suggests that mucosal lymphoid tissues are involved in the initiation of pathologic immune responses in NOD mice.

Adoptive Transfer↗

Comparison between four and eight cycles of intensive chemotherapy in adult acute myeloid leukemia: a randomized trial of the Finnish Leukemia Group.

In acute myelogenous leukemia (AML) intensive postremission treatment is needed for an optimal result. However, it is not known how long the treatment should last and how many courses are necessary. The object of this prospective study was to compare four and eight intensive chemotherapy cycles in the treatment of adult de novo AML. In a multicenter study, 248 consecutive patients, aged from 16 to 65 years, were treated with intensive induction treatment. The patients in remission after two courses were randomized to receive either two (short arm) or six (long arm) additional intensive cycles of chemotherapy. The median follow-up time of the living patients is 68 months. Of the patients, 77% achieved complete remission, and 36% of all patients survived for 5 years. Seventy-three patients were randomized to the short arm and 66 to the long arm. There was no significant difference in the relapse-free survival (median 21 months vs 17 months) or overall survival (43 months vs 39 months) between the short and long arms, respectively. Treatment-related deaths occurred in 31 patients (13%), 11 of them in first remission. More than one-third of the patients survived for 5 years. It seems probable that the first few months after diagnosis are decisive for the prognosis if the chemotherapy is intensive, and further treatment cannot markedly influence the outcome.

Aclarubicin↗

The role of Fas ligand in the development of insulitis in nonobese diabetic mice.

The role of Fas ligand-induced lymphocyte apoptosis in the development of insulitis was studied in nonobese diabetic (NOD) mice. Fas ligand with a molecular weight of 45 kD appeared in the pancreas of NOD mice during the onset of insulitis as demonstrated by western blot analysis. In situ DNA end-labeling (ISEL) of the pancreases of NOD mice demonstrated positive cells in the islets of Langerhans, with an age-dependent increase in the density and frequency of animals with islets containing ISEL-positive cells. In the pancreatic islets of BALB/c mice, no ISEL-positive cells were observed in any of the age groups studied. In ultrastructural analysis degenerating cells with condensed or fragmented nuclei and plasma membranes detached from neighboring cells were observed both in and around the islets. In some cases, these cells were being phagocytosed by the neighboring islet cells. Degenerating cells with characteristics of lymphocytes were seen in contact with healthy lymphocytes around the islets. Neutralizing Fas ligand antibodies affected 3H-thymidine incorporation of CD3+CD28+ pancreatic lymphocytes from 12- to 30-week-old NOD mice in one of three cultures. There was no difference in the effect of neutralizing Fas ligand antibodies between pancreatic and blood lymphocytes. The present results on an increase in density of apoptotic cells in pancreatic islets of NOD mice simultaneously with the onset of insulitis and appearance of Fas ligand suggest that the pancreas infiltrating lymphocytes may be destroyed by Fas ligand-induced apoptosis.

Aging↗

Ly-6C regulates endothelial adhesion and homing of CD8(+) T cells by activating integrin-dependent adhesion pathways.

Ly-6C belongs to the Ly-6 family of glycosyl phosphatidylinositol-anchored surface glycoproteins and is expressed on a subset of mature CD8(+) T cells. Ly-6C ligation can mediate T cell activation and causes interleukin 2 secretion in cytolytic T cell clones. We characterize herein a new mAb 1G7.G10 against Ly-6C that recognizes an epitope involved in lymphocyte adhesion and in lymphocyte homing. Pretreatment of lymph node lymphocytes and of purified CD8(+) T cells (but not of lymphocytes depleted of CD8(+) T cells) with 1G7.G10 reduced their in vitro binding to lymph node high endothelial venules by 28% and 34%, respectively. This effect was bypassed by cross-linking Ly-6C molecules with 1G7.G10 and a second-step antibody. The in vivo homing of (donor) CD8(+) T lymphocytes to lymph nodes was reduced by Ly-6C blocking with 1G7. G10 (whole antibody) or with its fragments [F(ab) or F(ab)2] by 20% or by 32% and 48%, respectively. Cross-linking of Ly-6C in vitro induced very late antigen-4 and lymphocyte function-associated antigen 1-mediated aggregation of CD8(+) T cells, suggesting that ligand binding to Ly-6C leads to activation of integrins. This activation may facilitate homing of Ly-6C+ CD8(+) T cells in vivo.

Animals↗

Intensive chemotherapy of poor prognosis myelodysplastic syndromes (MDS) and acute myeloid leukemia following MDS with idarubicin and cytarabine.

Forty patients with high risk myelodysplastic syndrome (MDS) or acute myeloid leukemia (AML) preceded by MDS were treated with intensive induction and consolidation chemotherapy in a prospective multicenter pilot study. They were given two cycles of cytarabine 100 mg/m with 12-h intervals on days 1-7 and idarubicin 12 mg/m2 on days 5-7, both intravenously. Patients who were in remission after these two cycles were given two further cycles of cytarabine on days 1-5 and idarubicin on day 5. No maintenance treatment was given. Eleven out of 19 MDS patients (58%) and 10 out of 21 AML patients (48%), in total 21 out of 40 patients (53%), entered remission. Eight patients underwent allogeneic bone marrow transplantation. The follow-up time was 13-48 (median 33) months. At the time of the analysis, seven patients survived, four patients with MDS all of whom had been treated with bone marrow transplantation (three in continuous remission), and three patients with AML treated with chemotherapy only (two in continuous remission). The median survival of the patients treated with chemotherapy only was 12 months, with the median progression-free survival being 8 months. In view of the poor prognostic factors of the patients, the remission rate was satisfactory, but the responses as well as the survival were short. The post-remission treatment needs to be improved.

Adult↗

CD106 (VCAM-1) in testicular immunoregulation.

The expression of CD18, CD49d/CD29, CD44, CD54 and CD106 was studied in the testis of normal mice at various ages, in the cryptorchid testis, in the testis of estrogen-treated mice and in the testis of non-obese diabetic (NOD) mice, using immunocytochemistry to see which of these lymphocyte and endothelial adhesion proteins may be involved in lymphocyte regulation in the testis. CD18-, CD49d/CD29-, CD44- and CD54-expressing cells were not found in the normal > 10-week-old BALB/c mouse testis. Leydig cells expressed CD106 strongly at this age. In contrast to the > 10-week-old testis, only very few interstitial cells of the 2-week-old normal mice expressed CD106. The expression of CD106 increased gradually with age so that at 6 weeks of age the expression of CD106 was moderate in the interstitial tissue. In the experimentally abdominal testis, CD106 was expressed in the interstitial tissue as strongly as in the contralateral scrotal testis. CD44- and CD18-expressing cells were occasionally present in the interstitial tissue of the abdominal testis, but not in the contralateral scrotal testis. CD54 was present in the epithelium of the ductuli efferentes. In the testis of the estrogen-treated mice, CD106 was expressed in the interstitial tissue as strongly as in the normal mice. Occasional CD44- and CD18-expressing cells were found in the testicular capsule. In the testis of adult NOD mice, CD106 was present in the interstitial tissue, but none of the other studied proteins. Immunoblotting of CD106 from the adult testis under reducing conditions demonstrated a single broad band with a M(r) of 51-65 kDa. This is a novel isoform of CD106. In a modified Stamper-Woodruff assay, lymphocytes bound to the testicular interstitial tissue. In co-incubations of native Leydig cells and lymphocytes, anti-CD106 antibodies prevented formation of Leydig cell-lymphocyte rosettes more than isotype-matched irrelevant control antibodies, suggesting that Leydig cell lymphocyte binding occurs through CD106-CD49d interactions. In lymphocyte cultures in the presence of anti-CD3, anti-CD28, the M(r) > 5 K fraction of testis extract (containing CD106 as shown by immunoblotting) and anti-CD106 or control antibody, anti-CD106 did not consistently affect T cell 3H-TdR incorporation. The present results suggest that CD106 expressed by the Leydig cells may act as an adhesion-promoting molecule or a co-stimulatory factor for T cells migrating to the testis.

Animals↗

Recirculation and homing of lymphocyte subsets: dual homing specificity of beta 7-integrin(high)-lymphocytes in nonobese diabetic mice.

The beta 7-integrin subunit can pair with two alpha-chains, alpha 4 and alpha E, and is expressed mainly on lymphocytes. As an alpha 4-heterodimer it binds to the mucosal addressin MAdCAM-1, thus acting as a mucosal homing receptor. As an alpha E-heterodimer it binds to E-cadherin and is mainly found on intestinal intraepithelial lymphocytes. Consequently, beta 7 is mostly expressed on lymphocytes of the mucosal immune system. To study the compartmentalization of these cells further we compared the distribution of such lymphocytes in two strains of mice (BALB/c and NOD) and found that the distribution of beta 7-positive lymphocytes among various lymphoid tissues in these strains was very different. In NOD mice a conspicuous population of beta 7-integrin(high) lymphocytes expressing either alpha 4, alpha E, or both, was found in nonmucosal lymphoid tissues such as peripheral lymph nodes (PLNs). They mostly expressed the PLN homing receptor L-selectin, and included both naive and memory cells on the basis of their expression of CD44/pgp-1 and CD45RB, as did the few beta 7(high) lymphocytes in BALB/c PLNs. Their homing to Peyer's patches (PPs) and PLNs was equally effective and the cells homing to PPs and PLNs were equal in their level of L-selectin and alpha 4/beta 7 expression. However, functional studies indicated that their homing to PPs mostly depended on alpha 4/beta 7-integrin, whereas they mainly used L-selectin to home to PLNs. beta 7(high) lymphocytes were found also in circulating blood of unmanipulated NOD mice, and their L-selectin expression was higher than in BALB/c mice. These results show that lymphocytes of the mucosal immune system may also express the peripheral node homing receptor L-selectin during their recirculation and that in NOD mice they frequently retain a dual homing specificity, which leads to their accumulation in nonmucosal tissues.

Animals↗

Measles virus hemagglutinin mediates monocyte aggregation and increased adherence to measles-infected endothelial cells.

The effect of measles virus (MV) infection on monocyte adhesion was studied using human peripheral blood monocytes and monocytic and endothelial cell lines. The infection of monocytic U-937 cells led to the formation of large cellular aggregates. Aggregation was independent of intercellular adhesion molecule-1 (ICAM-1)/lymphocyte function-associated antigen-1 (LFA-1), but could be inhibited by monoclonal antibodies (mAb) against the MV hemagglutinin glycoprotein (MV-H). mAb against the MV receptor, CD46, also blocked aggregation. No significant changes in the cell surface expression of adhesion molecules CD11a, CD11b, CD11c, CD18, CD54, CD44, CD49d (alpha 4-integrin) and CD62L (L-selectin) were observed on MV-infected monocytes. Infection of a human endothelial cell line, EAhy 926 (HEC), with MV led to a two-fold increase in 1CAM-1 expression and a two-fold increase in monocyte adherence to the HEC (from 22 +/- 1.6% to 42 +/- 4.8%). However, ICAM-1 mAb reduced monocyte adhesion to the control and MV-infected HEC to a similar degree, whereas anti-MV-H antibodies abolished the difference between binding to infected and control HEC. We conclude that MV hemagglutinin mediated both the homo typic aggregation in infected monocyte cultures and increased monocyte adherence to the infected endothelial cells.

Antibodies↗

Mucosa-associated (beta 7-integrinhigh) lymphocytes accumulate early in the pancreas of NOD mice and show aberrant recirculation behavior.

The mucosal addressin cell adhesion molecule-1 (MAdCAM-1) becomes expressed on islet vessels of NOD mice early during lymphocyte accumulation in islets. Because MAdCAM-1 preferentially mediates the homing of mucosal lymphocytes, islet-associated MAdCAM-1 could favor the accumulation of mucosal lymphocytes in pancreatic islets. Therefore, we investigated the relative frequency of islet-infiltrating lymphocytes with a mucosal phenotype (alpha 4/beta 7-integrinhigh and L-selectinlow) at early and advanced stages of insulitis. We found that until the age of 12 weeks, lymphocytes with a mucosal phenotype were particularly frequent in the pancreas (percentage of beta 7-integrinhigh-lymphocytes was 48% at 8 weeks and 73% at 12 weeks), whereas in diabetic mice older than 16 weeks, their relative number was smaller (26% of pancreas-infiltrating lymphocytes). To define the origin and homing behavior of beta 7-integrinhigh-lymphocytes before their accumulation in pancreatic islets in NOD mice, we sought for such lymphocytes in different lymphoid organs and studied their recirculation. We found that compared with lymphocytes in several other strains, in NOD mice such lymphocytes were most frequent in nonmucosal lymphoid tissues (peripheral and pancreatic lymph nodes, spleen) from an early age. When injected to blood circulation, mucosal beta 7high-lymphocytes failed to home efficiently back to mucosal lymphoid tissue in NOD mice but homed aberrantly to nonmucosal lymphoid tissues. After adoptive transfer of diabetogenic splenocytes, the first lymphocytes accumulating in the pancreas were predominantly beta 7-integrinhigh. We conclude that mucosa-associated lymphocytes are involved in the early phases of islet-inflammation in NOD mice and that the aberrant homing behavior of lymphocytes expressing high levels of beta 7-integrin may associate with their accumulation in pancreatic islets early during insulitis.

Aging↗

Heterotopic ossification after hip arthroplasty: a randomized double-blind multicenter study tenoxicam in 147 hips.

147 patients due to have a cemented total hip arthroplasty were randomized to 4 groups. They received either tenoxicam 20 mg or 40 mg, or placebo, for 5 days or morphine on the day of operation and placebo for 4 days. During the first 5 days 14 patients were excluded. The patients were followed for 1 year, during which another 10 patients were excluded. At follow-up, significantly fewer patients had heterotopic ossifications in the tenoxicam groups than in the placebo and morphine groups. There was no significant difference between the 2 tenoxicam-treated groups, and we therefore conclude that tenoxicam 20 mg for 5 days postoperatively can reduce heterotopic ossification after cemented total hip arthroplasty.

Anti-Inflammatory Agents, Non-Steroidal↗