18 research outputs found
Promene u limfatiÄnim organima komercijalnih piliÄa nakon vakcinacije protiv Marekove bolesti - histoloÅ”ka i stereoloÅ”ka analiza
The aim of this study was to investigate histomorphometrical characteristics of the thymus, bursa of Fabricius and spleen in the chickens vaccinated with a vaccine against Marekās disease. For this purpose, we used newly hatched chickens of the light hybrid line, obtained from a local hatchery. The chickens were vaccinated on the 5th day after hatching with a bivalent cell-associated Marek's disease vaccine (PFU-2000 per dose). On day 13 both vaccinated chickens and unvaccinated controls were sacrificed, and thymus, bursa and spleen were removed and processed for light microscopy. The serial tissue sections, hematoxylin-eosine stained, were used for histomorphometric analysis. Vaccination against Marekās disease decreased the relative mass of the lymphoid organs, and caused significant damage of the thymus and spleen in experimental chicken. In addition, vaccination, similar to Marek's disease virus, induced morphometric changes in the lymphoid organs. Namely, it significantly decreased the diameter and volume of lymphoid follicles, volume of follicular medulla and number of cells in the follicular cortex in the bursa of Fabricius. In the thymus, vaccination reduced the thymus volume and the absolute number of thymocytes. However, vaccination against Marekās disease caused an increase in the diameter, number and volume of lymphoid follicles in the spleen. The present data suggest that vaccination against Marekās disease was able to induce the immune response in processed organs, although it reduced the mass and number of lymphocytes in the major lymphoid organs.Cilj ovih ispitivanja su bile histomorfometrijske karakteristike timusa, burze Fabricii i slezine piliÄa vakcinisanih protiv Marekove bolesti. Za istraživanja su koriÅ”Äeni jednodnevni piliÄi lake hibridne linije, gajeni u standardnim uslovima. PiliÄi su vakcinisani 5. dana od izleganja, bivalentnom vakcinom protiv Marekove bolesti (PFU 2000 po dozi). Trinaestog dana od izleganja kontrolni i vakcinisani piliÄi su žrtvovani, uzeti su im timus, burza Fabricii i slezina koji su pripremljeni za svetlosno mikroskopsku analizu. Za analizu su koriÅ”Äeni serijski preseci limfatiÄ nih organa, bojeni metodom hematoksilin-eozin. Dobijeni rezultati su ukazali da vakcinacija protiv Marekove bolesti dovodi do smanjenja relativne mase timusa, burze i slezine, kao i poveÄanja indeksa oÅ”teÄenja timusa i slezine. TakoÄe je ustanovjleno da vakcinacija dovodi do promena morfometrijskih parametara u limfatiÄnim organima. U burzi Fabricii je uoÄeno znaÄajno smanjenje dijametra i zapremine limfocitnih folikula, zapremine medule folikula i broja Äelija u korteksu folikula. U timusu vakcinacija dovodi do redukcije zapremine timusa i apsolutnog broja timocita. MeÄutim, vakcinacija protiv Marekove bolesti u slezini dovodi do poveÄanja dijametra limfocitnih folikula, kao i do poveÄanja njihovog broja i zapremine. Rezultati ove studije su ukazali da vakcinacija piliÄa protiv Marekove bolesti, iako redukuje broj T i B limfocita, indukuje razvoj imunskog odgovora
Diferentovanje timocita u organ kulturi timusa odraslih pacova
To investigate the differences between thymocytes development in vivo and in vitro, thymus lobe fragments from 12-weeks old male Albino Oxford rats were cultivated over a 7-days period. In the controls and cultivated thymic lobes fragments were evaluated and the viability, apoptosis and cell cycle of thymocytes, as well as the histological characteristics of thymic tissue. Additionally, we analyzed the expression of CD4, CD8 and TCRĪ±Ī² on thymocytes by flow cytometry. The obtained results showed that thymus cellularity decreased during cultivated time due to expanded apoptosis, decreased proliferation and the absence of progenitors reseeding thymus. The relative proportion of thymocyte subsets in the first 24 hours of culture remained similar as in the control. However, cultivation for 3 and 7 days modulated the relative proportions between thymoctye subsets. The percentage of DP TCRĪ±Ī²low increased, DP TCRĪ±Ī²hi subset remained unchanged, both SP TCRĪ±Ī²hi subsets decreased while the same mature SP phenotype dominated in culture media. These results demonstrate that cultivated thymic fragments retain the capacity for T cell development, although cultivation modulates this process.Sa namerom da ispitamo razlike izmeÄu in vivo i in vitro sazrevanja timocita gajili smo fragmente lobusa timusa poreklom od mužjaka Albino Oksford pacova, starih dvanaest nedelja, u vremenskom periodu od sedam dana. Nakon kultivacije odreÄivani su vijabilnost, apoptoza i Äelijski ciklus timocita, kao i histoloÅ”ke osobine timusnog tkiva. TakoÄe je analizirano ispoljavanje markera diferentovanja CD4, CD8 and TCRĪ±Ī² na povrÅ”ini timocita metodom teÄne citofluorometrije. Dobijeni rezultati su ukazali da sedmodnevna kultivacija dovodi do smanjenja broja Äelija u timusu usled poveÄane apoptoze, smanjene proliferacije i odsustva ulaska progenitora timocita. Tokom prvih 24 sata kultivacije ne dolazi do promena u odnosima timocitnih populacija. MeÄutim, duže vreme kultivacije - 3 i 7 dana moduliÅ”e relativne odnose izmeÄu timocitnih subpopulacija - poveÄava se procenat DP TCRĪ±Ī²low, procenat DP TCRĪ±Ī²hi timocita ostaje nepromenjen, dok su procenti Äelija oba subseta SP TCRĪ±Ī²hi smanjeni, mada je prisustvo pomenutih SP subsetova dominantno u medijumu za kultivaciju. Navedeni rezultati pokazuju da kultivisani fragmenti timusnog tkiva zadržavaju sposobnost da podrže sazrevanje timocita u jednostruko pozitivne T Äelije, mada je diferentovanje timocita donekle modulisano kultivacijom
Effect of welded joint imperfection on the load-carrying capacity of pipe elbows subjected to in ā plane bending moment
The defects in pipe elbows can, depending on their size and position, affect the integrity and safe service, as well as deformation ability of the piping systems in exploitation. Incompletely filled groove, which is the type of defect examined here, was observed by ultrasonic measurement on the pipeline in the regulation system of the hydro power plant Djerdap. Three-dimensional finite element analysis is performed using Simulia Abaqus software package. First, the models with dimensions of the defects observed by non-destructive examination are formed. Stress and strain fields for different loading types are shown and commented. The influence of the defect dimensions on the pipe elbow load-carrying capacity is determined through plastic collapse loads, which are obtained from bending moment - rotation angle diagrams. Twice elastic slope (TES) technique is applied. Additionally, some more severe defects are considered, in the form of sharp pre-cracks at the bottom of the defect; plastic collapse loads are also determined for these geometries. Both opening and closing bending moments are taken into consideration and the results are discussed and compared to two closed-form solutions from the literature. The influence of the boundary conditions applied for examination of the pipe elbows iscommented
Peripubertetna ovarijektomija obezbeÄuje dugotrajno odlaganje starenjem uslovljenog smanjenja celularnosti timusa i produkcije T limfocita
The present study was undertaken to reassess the recently challenged role of ovarian hormones in age-associated thymic involution. For this purpose, in eleven-month-old peripubertally ovariectomized (Ox) rats we analyzed: i) thymic weight and cellularity, ii) size of CD4+CD8+ double-positive (DP) thymocyte population, which is believed to correlate to the thymic capacity to export mature T cells, iii) number of recent thymic emigrants (RTEs), and iv) number of peripheral blood CD4+ and CD8+ lymphocytes. It was found that both thymic weight and cellularity were greater in Ox than in control rats. In addition, in Ox rats the numbers of DP thymocytes and both CD4+ and CD8+ RTEs, were significantly greater than in controls, indicating a more efficient generation of T cells in these rats. Furthermore, these findings, coupled with data indicating that the number of neither CD4+ nor CD8+ peripheral blood lymphocytes was affected by ovariectomy, most likely, suggest a reduced homeostatic proliferation of memory cells in Ox rats, i.e. broadening of TCR peripheral repertoire without changes in the overall number of T cells leading to a more efficient response to newly encountered antigens. The results indicate that the ovarian steroid deprivation from early peripubertal period leads to a long lasting postponement/alleviation of age-associated decline in T-cell mediated immune response.Ova istraživanja su preduzeta sa ciljem da se preispita uloga gonadnih hormona u involuciji timusa, koja je nedavno dovedena u pitanje. U tom cilju je kod 11 meseci starih ženki pacova, koje su ovarijektomisane (Ox) u peripubertetnom uzrastu, analizirana: i) težina i celularnost timusa, ii) broj CD4+CD8+ dvostruko pozitivnih (DP) timocita, za koji se smatra da odražavaju sposobnost organa da generiÅ”e zrele T limfocite, iii) broj neposrednih emigranata iz timusa (RTE) i iv) ukupan broj CD4+ i CD8+ limfocita u perifernoj krvi. Dokazano je da su težina i celularnost timusa bile znaÄajno veÄe u Ox životinja. Kod ovih životinja je naÄen i poveÄan broj DP timocita, kao i CD4+ i CD8+ RTE, Å”to ukazuje na efikasniju produkciju T Äelija u njihovom timusu. Ovaj nalaz, u kontekstu nepromenjenog broja CD4+ i CD8+ Äelija u perifernoj krvi, takoÄe sugeriÅ”e smanjenu homeostatsku proliferaciju memorijskih Äelija, odnosno ukazuje na kvalitativne promene u perifernom T Äelijskom repertoaru (koje obezbeÄuju efikasniji odgovor na nove antigene) bez kvantitativnih promena. U celini, rezultati ukazuju da u odsustvu hormona ovarijuma poÄevÅ”i od ranog peripubertetnog uzrasta dolazi do znaÄajnog odlaganja/ublažavanja involucije timusa i poslediÄnih promena na periferiji
Somatostatin-14 izaziva razliÄite promene u timusima prepubertalnih i mladih odraslih pacova
Bearing in mind the role of somatostatin in thymus functions, and changes of somatostatin level and expression of its receptors during postnatal life, the aim of this study was to investigate whether centrally applied SRIH-14 induces different changes in the thymic compartments and thymocyte profile in peripubertal and young adult rats. To this end, 4- and 10-week-old male AO rats were cannulated and treated intracerebroventriculary with three doses of SRIH-14, applied every other day. In peripubertal rats, SRIH-14 decreases thymic relative weight and volume, as well as the volume of thymic compartments, especially of deep cortex, as a result of thymocytes loss by apoptosis. Also, SRIH-14 increases the percentage of immature thymocytes preceding the DPTCRĪ±Ī²low cells (DNTCRĪ±Ī²-/low, DPTCRĪ±Ī²-, SPCD8TCRĪ±Ī²-/low and SPCD4TCRĪ±Ī²-/low), decreases the percentages of DPTCRĪ±Ī²low and DPTCRĪ±Ī²hi cells, while the relative proportion of CD4+/CD8+TCRĪ±Ī²hi cells remained unaltered. In young adult rats, SRIH-14 does not lead to changes in relative thymus weight, although decreases the thymic cortex cellularity and volume. In addition, decreases the percentage of DPTCRĪ±Ī²-/hi cells and increases the percentages of cells within DNTCRĪ±Ī²hi and both SP subpopulations, but much more of the CD8+TCRĪ±Ī²hi subset. These results suggest that the effects of SRIH-14 on the thymus and thymocytes subpopulations are age-dependent.Sa obzirom da literaturni podaci ukazuju da somatostatin ima uticaja na funkciju timusa, kao i da se tokom postnatalnog života menja nivo somatostatina i ekspresija njegovih receptora u timusu, cilj ovog rada je bio da se ispita da li SRIH- 14 davan intracerebroventrikularno u prepubertalnih i mladih odraslih pacova, dovodi do razliÄitih promena u zonama timusa i profilu timocitnih subsetova. Mužjacima pacova AO soja, starim 4 i 10 nedelja, ugraÄene su kanile u treÄu moždanu komoru i oni su tretirani somatostatinom, ukupno tri doze, ubrizgane svakog drugog dana. U prepubertalnih pacova tretman somatostatinom dovodi do smanjenja relativne mase i zapremine timusa, kao i zapremine timusnih zona, naroÄito dubokog korteksa, Å”to je bila posledica gubitka timocita apoptozom. TakoÄe, SRIH-14 je doveo do poveÄanja procenta timocita nezrelog fenotipa (DNTCRĪ±Ī²-/low, DPTCRĪ±Ī²-, SPCD8TCRĪ±Ī²-/low i SPCD4TCRĪ±Ī²-/low) prekusora DPTCRĪ±Ī²low subpopulacije, smanjenja procenta DPTCRĪ±Ī²low i DPTCRĪ±Ī²hi subsetova, dok je relativni odnos najzrelijih CD4TCRĪ±Ī²hi i CD8TCRĪ±Ī²hi timocita ostao neizmenjen. U mladih adulta primena somatostatina, iako dovodi do smanjena zapremine i celularosti korteksa ne dovodi do promena u relativnoj masi timusa. Procenat DPTCRĪ±Ī²-/hi timocita je bio smanjen, dok je procentualno uÄeÅ”Äe DNTCRĪ±Ī²hi timocita i obe jednostruko pozitivne subpopulacije (CD4TCRĪ±Ī²hi i CD8TCRĪ±Ī²hi, viÅ”e CD8TCRĪ±Ī²hi) u ukupnom broju timocita bilo poveÄano. Navedeni rezultati ukazuju da SRIH-14 razliÄito utiÄe na morfologiju timusa i na subpopulacije timocita pacova u zavisnosti od uzrasta tretiranih životinja
Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure
ImajuÄi u vidu da lokalna oÅ”teÄenja smanjuju nosivost i moguÄnost deformiranja cjevovoda, analiziran je utjecaj greÅ”aka u zavarenom spoju na integritet cijevnih lukova izloženih djelovanju unutarnjeg tlaka. Ispitivane su greÅ”ke tipa neprovarenosti, jer su defekti ovog tipa prethodno otkriveni ultrazvuÄnim ispitivanjem na unutarnjoj povrÅ”ini cjevovoda u hidroelektrani. Trodimenzijska analiza metodom konaÄnih elemenata je uraÄena uporabom programskog paketa Abaqus. OdreÄen je utjecaj geometrije defekta u zavarenom spoju (dubina, duljina i položaj) na integritet cijevnih lukova. TakoÄer je odreÄen pad nosivosti u sluÄaju da postoji pukotina na dnu defekta. Ispitan je utjecaj tipa konaÄnih elemenata (rabljeni su elementi oblika heksaedra i tetraedra).Since local defects reduce the load-carrying capacity and deformation ability of a piping system, an analysis is undertaken to quantify the influence of weld defects on integrity of the pipe elbows subjected to internal pressure. Incompletely filled groove is examined, because this type of defect was previously detected by ultrasonic measurement on the inner surface of the pipeline from a hydro-power plant. Three-dimensional finite element analysis is conducted using Abaqus software package. The influence of weld defect geometry (its depth, length and location) on the elbow integrity is determined. Additionally, decrease of load carrying capacity is determined for the case when a crack has initiated at the bottom of the defect. The influence of finite element type (hexahedral or tetrahedral) is examined
Changes in the thymus of peripubertal rats induced by centrally applied somatostatin-28
The aim of this study was to investigate the effects of centrally applied somatostatin- 28 on morphometric characteristics of the thymus, the thymocyte subpopulations, as well as, on apoptosis and phases of cell cycle in thymocytes. For this purpose, peripubertal male rats were cannulated intracerebroventriculary and treated with repeated, nanomolar concentrations of somatostatin- 28 ( experimental group) or saline ( control group). Animals were sacrificed and their thymuses were used for the analysis of thymocyte subpopulations, cell cycle and apoptosis by flow cytometry and for the evaluation of morphometric parameters by stereological analysis. Our results showed that somatostatin- 28 caused decrease of the thymic mass and volume, as well as total thymocytes number. Stereological analysis revealed volume decrease of thymic cortex and medulla accompanied with cellularity decrease. Somatostatin in the deeper cortex decreased the number of thymocytes, per volume unit, while in outer cortex raised their number. A significant increase in the percentage of double-negative and both single-positive thymocyte subpopulations, in parallel with a diminished percentage of double- positive cells was found. The cellularity of double- positive and single-positive thymocyte subpopulations was decreased. Somatostatin-28 treatment augmented the percentage of apoptotic cells, while the percentage of the cells represented in phases of cell cycle was reduced. These results suggest that somatostatin- 28 induce thymus hypotrophy as result of decreasing cortex and medulla volume and cellularity. Changes in the percentage and cellularity of thymocyte subpopulations and numerical density of thymocytes in outer and deeper cortex, indicate that somatostatin- 28 evoked disturbance in transition of double- negative to double- positive thymocytes
The effects of chronic stress on thymus innervation in the adult rat
Various stressors induce changes in the immune system. However, it has not yet been analyzed how stressors affect thymus innervation. To examine whether chronic stress alters the morphology of the thymus by changing the nerve components of the thymus, adult mate rats, 9-weeks old, were exposed to forced swimming during 21 successive days. The animals were sacrificed by decapitation after the last session and their thymuses were used for analysis of (i) the thymus compartments, (ii) distribution patterns of monoamine-containing nerve profiles and (iii) distribution patterns of acetylcholinesterase (AChE)-containing nerve profiles. Our results show that chronic stress in rats reduces the volume of both thymus cortex and medulla, numbers of thymocytes in the deep cortex and medulla and the density of fluorescent nerve profiles, whereas it increases density of fluorescent cells. The distribution patterns of nerve profiles containing monoamine and AChE were not affected. These changes indicate that chronic stress affects thymus development and T cell maturation by altering the sympathetic nerve component. (c) 2004 Elsevier GmbH. All rights reserved