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Biomedical subjects

G Rasp

Publications and source records attributed to G Rasp.

At least 19 recordsLinked to original sources
PubMed2002

Immunocytochemical and biochemical identification of angiotensin II in human nasal tissue.

Angiotensin II (ANG II) was identified immunocytochemically and biochemically in biopsy samples of human nasal tissue. Staining for ANG II was predominantly found in structures similar to a string of pearls with consecutive short varicose areas, which is characteristic for neuronal tissue. The localization of ANG II in neurons was confirmed by positive staining of adjacent tissue sections with a specific antibody to neurofilament or doublestaining with both antibodies in one section. Likewise, ANG II-like material was also determined radioimmunologically in nasal tissue extracts. The concentrations of ANG II varied form 1.28 to 332.78 fmol/g wet tissue weight with an average concentration of 79.61+/-44.09 fmol ANG II/g wet tissue weight (mean+/-SEM, n=7). The ANG II-immunoreactive material was further characterized biochemically by HPLC on a reversed phase C(18) column in an acetonitrile and methanol gradient as Ile(5)-ANG II and ANG II metabolites such as Ile(4)-ANG III, Ile(3)-ANG II(3-8)hexapeptide and Ile(2)-ANG II(4-8)pentapeptide.

Angiotensin II↗
PubMed2002

[Giant Madelung's disease. Report of a case and review of the literature].

Madelung's disease, also known as benign symmetrical lipomatosis, is a rare proliferative disorder of unknown etiology that was first mentioned by Brodie in 1846. Characterized by multiple symmetrical deposits of unencapsulated fat in the head and neck region, the disease is most common in middle-aged men with a history of alcohol abuse. The only effective therapy in cases of dyspnea and dysphagia, indicating the necessity of treatment, is the surgical resection of the adipose tissue. The authors report on the evaluation and therapy in a case of giant Madelung's disease.

Adipose Tissue↗
PubMed2002

[Eosinophil inflammation of the nasal mucosa].

INTRODUCTION: Inflammatory diseases are very frequent and cause reasonable mortality. They are the major part in upper airway diseases in ENT. Eosinophil inflammation is a key feature in allergic rhinitis, asthma, nasal polyps and non-allergic rhinitis. The mechanism and the consequences of eosinophil inflammation are described in this review. METHODS AND RESULTS: Eosinophils mature in bone marrow, mainly under the influence of IL-5 and eotaxin. Once mobilised to circulation, they accumulate in inflammatory sites by specific adhesion. VCAM-1 and other adhesion molecules are involved in this process. In the tissue, eosinophils get activated by different stimuli like immunoglobulin receptors and cytokines like IL-5. Activated eosinophils release toxic proteins, mediators and cytokines and thus trigger further inflammatory response. This leads to the late phase reaction and continuing inflammatory reaction. Eosinophils also interact with virus infections and have effects on nerve endings with the M2 receptor. CONCLUSIONS: Eosinophil inflammation may be monitored via the determination of cationic proteins in nasal secretions. Corticosteroids are very effective in the treatment of eosinophil inflammation, and anti-IL-5 and anti-IL-4 antibodies seem to be effective, too.

Adrenal Cortex Hormones↗
PubMed2002

[Mesenchymal stem cells--a new pathway for tissue engineering in reconstructive surgery].

INTRODUCTION: Mesenchymal stem cells (MSC) have the capacity to differentiate into chondrocytes with the synthesis of cartilage. This report presents the use of human adult bone marrow derived mesenchymal stem cells for tissue engineering of autologous cartilage grafts. METHODS: Human bone marrow aspirates were obtained from the iliac crest and fractionated on a Percoll gradient. The isolated hMSC were plated at 20 x 10 (6) cells per 100 mm (2) culture dish. After 21 days in culture at 37 degrees C with 5 % CO 2, the adherent multiplied MSC were trypsinized, counted, and tested for viability by trypan blue assay. The hMSCs were loaded into a sterile 15 ml polypropylene tube (0.5 Mio cells/ml) and centrifuged on the bottom of the tube at 500 g for 5 minutes. The MSC were cultivated for 3 weeks in vitro in a specific chondrogenetic medium composed of Dulbecco's Modified Eagles Medium-High Glucose supplemented with 10 ng/ml transforming growth factor-beta 1, 1 % ITS-Premix medium, 80 micro M ascorbic acid, and 100 nM dexamethasone. RESULTS: Histological and immunohistochemical studies performed after 3 weeks in three dimensional culture demonstrated the expression of cartilage specific collagen type II and X as well as proteoglycans. CONCLUSION: Human adult mesenchymal stem cells derived from bone marrow aspirates have the ability to differentiate into chondrocytes under specific culture conditions by growth factors. The use of adult mesenchymal stem cells may be a promising tool for tissue engineering of autologous cartilage grafts in reconstructive surgery in the future.

Adult↗
PubMed2001

Immunohistological expression of interleukin 16 in human tonsils.

BACKGROUND: Interleukin 16 (IL-16) acts highly chemotactic on CD4-bearing cells. Besides chemotaxis, IL-16 has numerous immunomodulatory effects, and not only on T cells. OBJECTIVE: To determine IL-16 expression in human tonsils. METHODS: Tonsillar follicles were immunohistologically characterized to elicit a possible cellular source of IL-16 expression. RESULTS: The mantle zone of immature and mature B cells was CD22 immunoreactive (ir), whereas the germinal center of activated B cells was CD23-ir. Plasma cells that were CD38-ir were observed extrafollicularly beneath the epithelium and within the germinal center. T cells were found most frequently in the extrafollicular space, with a majority of CD4 cells. CD68-ir macrophages were predominantly found within the germinal center. Immunostaining of anti-IL-16 revealed strong cytoplasmatic reactivity of extrafollicular cells and of cells at the outer rim of the mantle zone. Numerous cells adherent to the stratified squamous epithelium were IL-16-ir as well. Double immunostaining identified CD4(+) T cells as the major cellular source of IL-16 expression. Furthermore, a population of CD22(+) B cells at the outer rim of the mantle zone expressed IL-16 as well. CONCLUSIONS: Interleukin 16 was mainly expressed in a typical CD4-like pattern in human tonsils. Our data strongly suggest that CD4(+) lymphocytes constitute the major cellular source for IL-16. We hypothesize that the double-immunostained CD4-ir and IL-16-ir cells represent activated T cells. Because CD22(+) B cells at the outer rim of the mantle zone expressed IL-16 as well, we conclude that this area might constitute the locus of IL-16-mediated B-cell differentiation.

Child↗
PubMed2001

Nasopharyngeal epignathus causing nasal airway blocking in a 4-year old child.

Congenital oral teratoma or epignathus is a very rare lesion, especially in older children. We report on a 4-year old female infant presenting with nasal blocking, little watery discharge and recurrent otitis. First adenoids were suspected. An endoscopic examination of the nose and nasopharynx demonstrated an irregular mass in the nasopharynx, covered partly by mucosa. A MRI-scan (T1-weighted) showed fat-intensity. Histological examination revealed a teratomatous malformation. Although rare, teratoma should be included in the differential diagnosis of a nasopharyngeal mass in the paediatric age group.

Child, Preschool↗
PubMed2001

Allergic rhinitis does not constitute a risk factor for obstructive sleep apnea syndrome.

Obstructive sleep apnea syndrome (OSAS) is a condition characterized by recurrent episodes of obstruction of the upper airway. The aim of this study was to evaluate whether nasal obstruction due to allergic rhinitis constitutes a risk factor for OSAS. Patients (n = 119) presenting typical symptoms of sleep apnea were tested for OSAS using polysomnography. Additionally all patients were tested in vivo and in vitro (including nasal eosinophilic cationic protein) for allergic rhinitis. Examination for allergic rhinitis revealed that 88.3% of all patients had no allergic rhinitis, whereas only 11.7% were diagnosed as allergic. No significant differences in sleeping parameters were observed between allergic and non-allergic patients. Comparison of parameters indicative of relevant OSAS (apnea-hypopnea index [AHI] > 10) revealed that 60% of non-allergic patients had relevant OSAS, compared to only 50% of allergic patients. Investigation of allergic subgroups revealed similar results: no significant differences in sleeping parameters or elevated rates of relevant OSAS parameters were observed, especially in perennial allergic rhinitis due to house dust mites. No elevated rates of allergic rhinitis were observed in the studied cohort of patients suffering from sleep apnea or OSAS. Furthermore, no significant differences in sleeping behavior or polysomnography parameters were found on comparing allergic and non-allergic patients. In summary, our data rule out allergic rhinitis as a major risk factor for OSAS.

Electroencephalography↗
PubMed2000

[Autologous rib cartilage harvesting: operative procedure and postoperative pain reduction].

INTRODUCTION: In reconstructive surgery there is a growing demand for cartilage grafts. For small amounts of autologous tissue, cartilage from the nasal septum or ear concha is a sufficient and reliable tissue, but in cases of extensive defects or higher mechanical load autologous rib cartilage is a commonly used transplant. Nevertheless, a serious donor-site morbidity, especially postoperative pain, has to be taken into consideration. We present a modified technique for harvesting rib cartilage with a consecutive local pain therapy. TECHNIQUE: In contrast to the commonly used incision through all layers of tissue the described technique follows the anatomical structures of skin tension-lines, the fascial and muscle fibers and tissue sliding-planes. Starting with a transversal skin incisions 1.5 cm above the costal arch, longitudinal splitting of the rectus abdominis fascia and muscle, the rib cartilage of the ribs 6 to 8 can be exposed. Grafts in the size of at least 3 to 8 cm can be harvested under preservation of the perichondrium. This technique causes a high degree of stability and good function of the abdominal wall. POSTOPERATIVE PAIN THERAPY: After harvesting rib cartilage most patients complain about extensive postoperative pain. For adequate treatment the local application of a long-lasting anesthetic substance close to the intercostal nerves is helpful. The introduction of a peridural catheter opens the feasibility of continuously applying a local anesthetic for 3 to 4 days directly into the donor-site. This procedure reduces the need for general anesthetics dramatically and prevents further complications. DISCUSSION: This modified technique for harvesting rib cartilage diminishes the donor-site morbidity by reducing the risk of pneumothorax, hernias and functional deficits. Moreover, the local pain therapy assures postoperative wellness and mobility.

Anesthetics, Local↗
PubMed2000

[A new system for the classification of ethmoid polyposis. Effect of combined local and systemic steroid therapy].

BACKGROUND: Nasal polyps are a common disease with in the majority of cases unknown origin. Both the medical and surgical treatment of nasal polyps present a challenge in Otorhinolaryngology. METHODS: We developed a four-stage grading system for nasal polyps based on the endoscopic aspect of more than 300 patients. In a study of 37 patients, treated by systemically (Methylprednisolon 64 mg p.o., decreasing amounts for the first 11 days) and locally (Budesonid 400 micrograms intranasal) applied steroids for 90 days, this staging-system was tested. RESULTS: The mean stage of polyps decreased significantly (p < 0.01) from 2.8 at day 0 to 1.7 at day 7 and further to 1.2 and to 0.7 at day 28 and day 90 respectively. The mean nasal symptom score decreased equally from 1.14 on day 1 to 0.19 and to 0.14 on day 7 and day 28 respectively. To summarize, we observed a significant (p < 0.01) decrease in polyp stages of 75% respectively a significant (p < 0.01) reduction of symptom scores of 93%. CONCLUSIONS: Thus, we present a suitable new grading system for nasal polyps which we applied directly to assess the efficacy of combined local and systemic steroid therapy. It was shown that this treatment can reduce polyps and prevent their recurrence over the observed time.

Administration, Intranasal↗
PubMed2000

Nasal interleukin-5, immunoglobulin E, eosinophilic cationic protein, and soluble intercellular adhesion molecule-1 in chronic sinusitis, allergic rhinitis, and nasal polyposis.

OBJECTIVE: To compare concentrations of interleukin-5 (IL-5), immunoglobulin E (IgE), eosinophilic cationic protein (ECP), and soluble intercellular adhesion molecule-1 (sICAM-1) in nasal secretion and serum of patients with chronic nonallergic sinusitis, allergic rhinitis, and nonallergic nasal polyposis to obtain information about the pathogenesis of these diseases. METHODS: Nasal secretion and serum were analyzed by routine enzyme-linked immunosorbent assay techniques. Nineteen patients with chronic nonallergic sinusitis, 24 patients with seasonal allergic rhinitis, and 18 patients with nonallergic nasal polyposis were included in the study. Eight healthy, nonallergic probands served as control subjects. RESULTS: Significantly elevated concentrations of IL-5 (5-fold, P < .05) and IgE (15-fold, P < .01) were detected in nasal secretion of patients with allergic rhinitis (IL-5, 51.8 +/- 13.2 pg/mL; IgE, 41.9 +/- 20.9 kU/L) or nonallergic nasal polyposis (IL-5, 57.9 +/- 36.9 pg(mL; IgE, 40.5 +/- 20.2 kU/L) compared with controls (IL-5, 10.6 +/- 7.8 pg/mL; IgE, 2.8 +/- 0.5 kU/L) or with patients with chronic nonallergic sinusitis (IL-5, 16.5 +/- 13.2 pg/mL; IgE, 5.4 +/- 3.1 kU/L). There were no significant differences between patients with allergic rhinitis and those with nonallergic nasal polyposis. Concentrations of ECP were significantly elevated (sixfold, P < .01) in patients with allergic rhinitis (297.8 ng/mL +/- 173.1) compared with controls (52.4 +/- 28.0 ng/mL) or patients with chronic nonallergic sinusitis (44.8 +/- 40.1 ng/mL), whereas twofold higher concentrations (not significant) of ECP were observed in patients with nonallergic nasal polyposis (107.1 +/- 26.6 ng/mL). Significantly elevated concentrations of sICAM-1 in nasal secretion (threefold, P < .05) were detected only in patients with chronic nonallergic sinusitis (79.4 +/- 45.6 ng/mL). The elevated sICAM-1 nasal secretion values in this group correlated significantly (P < .05) to the serum values. CONCLUSIONS: Equally elevated concentrations of IL-5 and IgE in patients with allergic rhinitis and nonallergic nasal polyposis implicated similar pathogenic processes in both diseases. Whereas the pathogenesis of allergic rhinitis is IgE-specific, the pathogenesis of nasal polyps is not as clear. IL-5 was suggested to play a pivotal role in tissue eosinophilia, which was confirmed by data in the present study. Elevated concentrations of ECP were suggested to result from tissue eosinophilia--a characteristic of both diseases. Elevated concentrations of sICAM-1 in patients with chronic nonallergic sinusitis pointed to its key role in the recruitment of neutrophils into the inflamed tissue, whereas an important role in eosinophil recruitment was ruled out.

Adult↗
PubMed1999

Norm values for eosinophil cationic protein in nasal secretions: influence of specimen collection.

BACKGROUND: Eosinophil granulocytes play an important role in allergic inflammation of the nasal mucosa. Eosinophil cationic protein (ECP) is a specific eosinophil granule protein released upon activation of these cells. ECP concentration in nasal secretions has been demonstrated to be a good marker for the activity of eosinophilic nasal mucosal inflammation. The clinical use of such a marker requires defined values which are regarded as pathological or within normal range. In analyses of nasal secretion samples, the sampling method has an important influence on the data obtained. OBJECTIVE: We investigated ECP levels in nasal secretions (NS) of healthy volunteers obtained by seven different methods of sample collection to define norm values and to evaluate the clinical use of the different methods. METHODS: A total of 839 healthy individuals were evaluated using blowing the nose (Bl: n = 82), suction (Suc: n = 69), Okuda microsuction technique (MSuc: n = 93), absorbent cotton wool samplers (CWS: n = 156), rubber-foam samplers (RFS: n = 193), nasal lavage (Lav: n = 112) and nasal spray washing (NSW: n = 134). RESULTS: Missing values occurred in more than 60% in Bl, Suc and MSuc, so that no norm range was defined for these methods. Norm range for ECP in NS was 5-46 ng/mL for CWS, 7-41 ng/mL for RFS, 4-51 ng/mL for NSW, and 3-31 ng/mL for Lav. CONCLUSIONS: When comparing seven different methods used in this study to collect nasal secretions and determine ECP levels, the method based upon absorption or nasal washing was the best.

Adolescent↗
PubMed1999

[Short-term immunotherapy--a survey of current studies].

Immunotherapy (IT) plays a central role in the therapy of allergic rhinitis as it was proved to be causal and preventive. IT induces humoral and cellular changes in the immune system, a reduction of symptoms and a prophylactic effect regarding a possible expansion of the allergene spectrum and of involved organ systems. Regular therapeutic schedules include allergen injections starting immediately after the pollen season and ending just before the expected beginning of a season. Additionally, perseasonal and perennial therapy schemes have been used. In all these, a phase of dose-increase is followed by an individually adjusted steady-state preservation-phase. In perseasonal and perennial scheme the injections are given during the pollen season. The preseasonal shortterm-immunotherapy is another schedule. The increase of the injected allergen-dose is made very fast (most commonly during seven weeks), so that the phase of dose-increase is shortened considerably, and a preservation-phase does not take place. This shortterm-immunotherapy has been developed for patients who consult their doctor shortly before the start of the pollen season. The preseasonal shortterm-immunotherapy has been shown to be efficient regarding allergic rhinitis caused by grass-, rye-, birch-, hazel- and alder-pollen. Clinical and experimental data of two placebo-controlled trials and one open study are presented and the role of this new immunotherapy approach is discussed.

Adult↗