Cyclosporin A preferentially attenuates skeletal slow-twitch muscle regeneration

Calcineurin, a Ca2+/calmodulin-dependent phosphatase, is associated with muscle regeneration via NFATc1/GATA2-dependent pathways. However, it is not clear whether calcineurin preferentially affects the regeneration of slow- or fast-twitch muscles. We investigated the effect of a calcineurin inhibitor, cyclosporin A (CsA), on the morphology and fiber diameter of regenerating slow- and fast-twitch muscles. Adult Wistar rats (259.5 ± 9 g) maintained under standard conditions were treated with CsA (20 mg/kg body weight, ip) for 5 days, submitted to cryolesion of soleus and tibialis anterior (TA) muscles on the 6th day, and then treated with CsA for an additional 21 days. The muscles were removed, weighed, frozen, and stored in liquid nitrogen. Cryolesion did not alter the body weight gain of the animals after 21 days of regeneration (P = 0.001) and CsA significantly reduced the body weight gain (15.5%; P = 0.01) during the same period. All treated TA and soleus muscles showed decreased weights (17 and 29%, respectively, P < 0.05). CsA treatment decreased the cross-sectional area of both soleus and TA muscles of cryoinjured animals (TA: 2108 ± 930 vs 792 ± 640 µm²; soleus: 2209 ± 322 vs 764 ± 439 m²; P < 0.001). Histological sections of both muscles stained with Toluidine blue revealed similar regenerative responses after cryolesion. In addition, CsA was able to minimize these responses, i.e., centralized nuclei and split fibers, more efficiently so in TA muscle. These results indicate that calcineurin preferentially plays a role in regeneration of slow-twitch muscle.

Secondary prevention of type 1 diabetes mellitus: stopping immune destruction and promoting ß-cell regeneration

Type 1 diabetes mellitus results from a cell-mediated autoimmune attack against pancreatic ß-cells. Traditional treatments involve numerous daily insulin dosages/injections and rigorous glucose control. Many efforts toward the identification of ß-cell precursors have been made not only with the aim of understanding the physiology of islet regeneration, but also as an alternative way to produce ß-cells to be used in protocols of islet transplantation. In this review, we summarize the most recent studies related to precursor cells implicated in the regeneration process. These include embryonic stem cells, pancreas-derived multipotent precursors, pancreatic ductal cells, hematopoietic stem cells, mesenchymal stem cells, hepatic oval cells, and mature ß-cells. There is controversial evidence of the potential of these cell sources to regenerate ß-cell mass in diabetic patients. However, clinical trials using embryonic stem cells, umbilical cord blood or adult bone marrow stem cells are under way. The results of various immunosuppressive regimens aiming at blocking autoimmunity against pancreatic ß-cells and promoting ß-cell preservation are also analyzed. Most of these regimens provide transient and partial effect on insulin requirements, but new regimens are beginning to be tested. Our own clinical trial combines a high dose immunosuppression with mobilized peripheral blood hematopoietic stem cell transplantation in early-onset type 1 diabetes mellitus.

The use of light-emitting diodes to stimulate mitochondrial function and liver regeneration of partially hepatectomized rats

The biostimulating effect of laser radiation has been observed in many areas of Medicine. However, there are still several questions to be answered, among them the importance of light coherence in the stimulatory process. In the present study, we used light-emitting diodes (LED) to promote the stimulation of liver regeneration after partial hepatectomy in rats. Fourteen male Wistar rats weighing 200-250 g were submitted to partial hepatectomy (70%) followed by LED light irradiation (630 nm) of the remaining part of the liver at two doses, i.e., 10 (N = 7) and 140 (N = 7) J/cm². A group irradiated with laser, 590 nm (N = 7, 15 J/cm²) was performed for the study of proliferating cell nuclear antigen-labeling index. Data are reported as mean ± SEM. Statistical comparisons of the groups were performed by analysis of variance for parametric measurements followed by the Bonferroni post-test, with the level of significance set at P < 0.05. Respiratory mitochondrial activity was increased in the irradiated groups (states 3 and 4; P < 0.05), with better results for the group exposed to the lower LED dose (10 J/cm²). The proliferating cell nuclear antigen-labeling index, by immunohistochemical staining, was similar for both LED-exposed groups (P > 0.05) and higher than for the control group (P < 0.05). The cell proliferation index obtained with LED and laser were similar (P > 0.05). In conclusion, the present results suggest that LED irradiation promotes biological stimulatory effects during the early stage of liver regeneration and that LED is as effective as laser light, independent of the coherence, divergence and cromaticity.

Effects of strain and age on ear wound healing and regeneration in mice

Round holes in the ears of MRL mice tend to close with characteristics of regeneration believed to be absent in other mouse strains (e.g., C57BL/6). We evaluated the kinetics and the histopathology of ear wound closure in young (8 weeks old) C57BL/6 and BALB/c mice. We also used middle-aged (40 weeks old) C57BL/6 mice to evaluate the influence of aging on this process. A circular through-and-through hole was made in the ear, photographs were taken at different times after injury and wound area was measured with digital analysis software. The percentages of closed area measured on day 100 were: 23.57 ± 8.66% for young BALB/c mice, 56.47 ± 7.39% for young C57BL/6 mice, and 75.31 ± 23.65% for middle-aged C57BL/6 mice. Mice were sacrificed on days 1, 3, 5, 25, 44, and 100 for histological evaluation with hematoxylin and eosin, Gomori’s trichrome, periodic acid-Schiff, or picrosirius red staining. In young mice of both strains, healing included re-epithelialization, chondrogenesis, myogenesis, and collagen deposition. Young C57BL/6 and BALB/c mice differed in the organization of collagen fibers visualized using picrosirius-polarization. Sebaceous glands and hair follicles regenerated and chondrogenesis was greater in young C57BL/6 mice. In middle-aged C57BL/6 mice all aspects of regeneration were depressed. The characteristics of regeneration were present during ear wound healing in both young BALB/c and young C57BL/6 mice although they differed in intensity and pattern. Greater ear wound closure in middle-aged C57BL/6 mice was not correlated with regeneration.

Effect of neurotrophic factor, MDP, on rats’ nerve regeneration

Our objective was to determine the immune-modulating effects of the neurotrophic factor N-acetylmuramyl-L-alanyl-D-isoglutamine (MDP) on median nerve regeneration in rats. We used male Wistar rats (120-140 days of age, weighing 250-332 g) and compared the results of three different techniques of nerve repair: 1) epineural neurorrhaphy using sutures alone (group S - 10 rats), 2) epineural neurorrhaphy using sutures plus fibrin tissue adhesive (FTA; group SF - 20 rats), and 3) sutures plus FTA, with MDP added to the FTA (group SFM - 20 rats). Functional assessments using the grasp test were performed weekly for 12 weeks to identify recovery of flexor muscle function in the fingers secondary to median nerve regeneration. Histological analysis was also utilized. The total number and diameter of myelinated fibers were determined in each proximal and distal nerve segment. Two indices, reported as percentage, were calculated from these parameters, namely, the regeneration index and the diameter change index. By the 8th week, superiority of group SFM over group S became apparent in the grasping test (P = 0.005). By the 12th week, rats that had received MDP were superior in the grasping test compared to both group S (P < 0.001) and group SF (P = 0.001). Moreover, group SF was better in the grasping test than group S (P = 0.014). However, no significant differences between groups were identified by histological analysis. In the present study, rats that had received MDP obtained better function, in the absence of any significant histological differences.

Effect of skilled and unskilled training on nerve regeneration and functional recovery

The most disabling aspect of human peripheral nerve injuries, the majority of which affect the upper limbs, is the loss of skilled hand movements. Activity-induced morphological and electrophysiological remodeling of the neuromuscular junction has been shown to influence nerve repair and functional recovery. In the current study, we determined the effects of two different treatments on the functional and morphological recovery after median and ulnar nerve injury. Adult Wistar male rats weighing 280 to 330 g at the time of surgery (N = 8-10 animals/group) were submitted to nerve crush and 1 week later began a 3-week course of motor rehabilitation involving either "skilled" (reaching for small food pellets) or "unskilled" (walking on a motorized treadmill) training. During this period, functional recovery was monitored weekly using staircase and cylinder tests. Histological and morphometric nerve analyses were used to assess nerve regeneration at the end of treatment. The functional evaluation demonstrated benefits of both tasks, but found no difference between them (P > 0.05). The unskilled training, however, induced a greater degree of nerve regeneration as evidenced by histological measurement (P < 0.05). These data provide evidence that both of the forelimb training tasks used in this study can accelerate functional recovery following brachial plexus injury.

In vitro cultivation of canine multipotent mesenchymal stromal cells on collagen membranes treated with hyaluronic acid for cell therapy and tissue regeneration

Support structures for dermal regeneration are composed of biodegradable and bioresorbable polymers, animal skin or tendons, or are bacteria products. The use of such materials is controversial due to their low efficiency. An important area within tissue engineering is the application of multipotent mesenchymal stromal cells (MSCs) to reparative surgery. The combined use of biodegradable membranes with stem cell therapy may lead to promising results for patients undergoing unsuccessful conventional treatments. Thus, the aim of this study was to test the efficacy of using membranes composed of anionic collagen with or without the addition of hyaluronic acid (HA) as a substrate for adhesion and in vitro differentiation of bone marrow-derived canine MSCs. The benefit of basic fibroblast growth factor (bFGF) on the differentiation of cells in culture was also tested. MSCs were collected from dog bone marrow, isolated and grown on collagen scaffolds with or without HA. Cell viability, proliferation rate, and cellular toxicity were analyzed after 7 days. The cultured cells showed uniform growth and morphological characteristics of undifferentiated MSCs, which demonstrated that MSCs successfully adapted to the culture conditions established by collagen scaffolds with or without HA. This demonstrates that such scaffolds are promising for applications to tissue regeneration. bFGF significantly increased the proliferative rate of MSCs by 63% when compared to groups without the addition of the growth factor. However, the addition of bFGF becomes limiting, since it has an inhibitory effect at high concentrations in culture medium.

Stretch-induced nerve injury: a proposed technique for the study of nerve regeneration and evaluation of the influence of gabapentin on this model

The rat models currently employed for studies of nerve regeneration present distinct disadvantages. We propose a new technique of stretch-induced nerve injury, used here to evaluate the influence of gabapentin (GBP) on nerve regeneration. Male Wistar rats (300 g; n=36) underwent surgery and exposure of the median nerve in the right forelimbs, either with or without nerve injury. The technique was performed using distal and proximal clamps separated by a distance of 2 cm and a sliding distance of 3 mm. The nerve was compressed and stretched for 5 s until the bands of Fontana disappeared. The animals were evaluated in relation to functional, biochemical and histological parameters. Stretching of the median nerve led to complete loss of motor function up to 12 days after the lesion (P<0.001), compared to non-injured nerves, as assessed in the grasping test. Grasping force in the nerve-injured animals did not return to control values up to 30 days after surgery (P<0.05). Nerve injury also caused an increase in the time of sensory recovery, as well as in the electrical and mechanical stimulation tests. Treatment of the animals with GBP promoted an improvement in the morphometric analysis of median nerve cross-sections compared with the operated vehicle group, as observed in the area of myelinated fibers or connective tissue (P<0.001), in the density of myelinated fibers/mm2 (P<0.05) and in the degeneration fragments (P<0.01). Stretch-induced nerve injury seems to be a simple and relevant model for evaluating nerve regeneration.

« Interruption du sommeil cabalistique, ou Le devoilement des tableaux de l'antiquité. — La Crisologie chimique, divisée en deux liyres, dans laquelle est monstré et manifesté ce qui a esté caché et voilé par l'antiquité, et dans laquelle toutes difficultés de l'art sont elucidées. — Du Genre de l'or et sa genealogie, avec l'anatomie de l'eau, la genealogie et regeneration du fils du soleil ».

Commençant par : « S'il est vray que le testament soit une atestation de l'esprit et de la volonté... » et finissant par : «... partant soyez content, et louez Dieu » .

The role of microRNAs and retinoid signaling during spinal cord regeneration in the adult newt.

The molecular events after spinal cord injury that lead to the establishment of a permissive environment and epimorphic regeneration remain unclear. Two molecular pathway regulators that may converge to create a spinal cord regeneration-permissive environment in the urodele are retinoic acid (RA) and microRNAs (miRNAs). Recent evidence suggests that RARβ-mediated signaling is necessary for tail and caudal spinal cord regeneration in the adult newt. MicroRNAs are attractive candidates as mediators of retinoid signaling during regeneration, as their pleiotropic effects are vital in situations where global changes in gene expression are required. Thus, the overall aim of this thesis was to determine if miRNAs are involved in tail and caudal spinal cord regeneration in the adult newt, and if they act as regulators and/or effectors of retinoid signaling during this process. I have demonstrated here, for the first time, that multiple miRNAs are dysregulated in response to spinal cord injury in the adult newt, as well as in response to inhibition of retinoid signaling. Two of these miRNAs, miR-133a and miR-1, appear to target RARβ2 transcripts both in vivo and in vitro. Inhibition of RA signaling via RARβ with a selective antagonist, LE135, alters the pattern of expression of these miRNAs, which leads to an inhibition of tail regeneration. These data are indicative of a negative feed back loop, albeit potentially an indirect one. I also aimed to examine which miRNAs are affected by inhibiting RA synthesis during regeneration, and provided a long list of miRNAs that are dysregulated. These data provide the foundation for future studies on the putative roles of these miRNAs, as well as their function in retinoid signaling. Overall, these studies provide the first evidence for a role for miRNAs as mediators of retinoid signaling during caudal spinal cord regeneration in any system.

Étude du mécanisme par lequel la thérapie à l'IL7 induit l'expansion homéostatique des lymphocytes T CD4+

Dans les cas de lymphopénie, les lymphocytes T résiduels prolifèrent exagérément dans un phénomène appelé «expansion homéostatique périphérique» (HPE), qui est efficace pour la régénération des T CD8+, mais inefficace pour les T CD4+. L’interleukine-7 (IL7) est une cytokine homéostatique utilisée afin d’augmenter les comptes lymphocytaires T des patients lymphopéniques. Toutefois, la raison de l’expansion préférentielle des lymphocytes T CD8+ par l’IL7 demeure toujours inconnue. Nous montrons que cette expansion est due au fait que l’IL7 induit une prolifération efficace des T CD8+ périphériques (CD8+PERI) ainsi que des émigrants thymiques CD8+ (CD8+RTEs). Par contre, l’effet prolifératif de l’IL7 est restreint presqu’uniquement aux CD4+RTEs même si les CD4+PERI survivent mieux que les CD4+RTEs. De plus faibles doses d’IL7 sont nécessaires aux CD4+RTEs afin de phosphoryler STAT5 ou de proliférer comparativement aux CD4+PERI et nous démontrons que les contacts TCR/CMHII sont nécessaires à la prolifération induite par l’IL7 des CD4+RTEs en périphérie. De fait, augmenter au Flt3 ligand le nombre de cellules dendritiques périphériques d’une souris donneuse, avant de transférer ses TPERI dans des souris receveuses traitées à l’IL7 induit une prolifération significative des CD4+PERI. Nos résultats indiquent donc que l’abondance des contacts TCR/CMHII reçus dans le thymus semble contrôler la sensibilité à l’IL7 des CD4+RTEs. Finalement, l’observation que les CD8+PERI et CD8+RTEs prolifèrent pareillement pendant la thérapie à l’IL7, alors que la prolifération des T CD4+ est largement restreinte aux RTEs expliquerait pourquoi, dans les cas de lymphopénie, la régénération des T CD4+ est aussi dépendante de la thymopoïèse.

Impact de la maladie du greffon contre l’hôte sur la reconstitution immunitaire suite à une greffe de moelle osseuse allogénique

La transplantation allogénique de cellules souches hématopoïétiques est une technique très efficace pour traiter différents cancers du sang. Malheureusement la réaction du greffon contre l’hôte (GVHD) demeure la cause principale de morbidité et de mortalité post-greffe. La GVHD entraîne une diminution de la reconstitution immunitaire ce qui accentue considérablement l’immunosuppression associée à ce traitement et de ce fait augmente les risques d’infection et de rechute. Notre laboratoire a démontré précédemment que les niveaux élevés d’IL-7 dans des hôtes lymphopéniques interféraient avec la capacité des cellules dendritiques (DC) à soutenir la prolifération homéostatique (PH) des lymphocytes T CD4+. Puisque les niveaux d’IL-7 sont aussi élevés dans un contexte de GVHD, nous avons émis l’hypothèse que la signalisation de l’IL-7 sur les DC pouvait contribuer à diminuer la reconstitution immunitaire des lymphocytes T CD4+. Pour répondre à cette question, nous avons utilisé le modèle murin de GVHD C57BL/6 (B6) dans B6D2F1. Afin de régénérer une niche hématopoïétique permissive à la PH des lymphocytes T CD4+, nous avons transplanté des souris B6D2F1 avec de la moelle osseuse de souris B6 IL-7Rα-/-. La GVHD a été induite en transférant des lymphocytes T B6 réactifs aux cellules B6D2F1. Dans les souris contrôles, la PH des lymphocytes T CD4+ est maintenue. Par contre, la PH est absente dans les souris en GVHD malgré la présence d’une niche périphérique qui ne répond pas à l’IL-7. L’absence de PH des lymphocytes T CD4+ durant la GVHD est associée à une diminution du nombre de DC. En utilisant un test de cytotoxicité in vivo nous démontrons que les DC B6 générées dans une hôte B6D2F1 sont éliminées par les lymphocytes T B6 alloréactifs. En conclusion, nos résultats démontrent que l’immunosuppression associée à la GVHD est en partie causée par une élimination des DC par les lymphocytes T allogéniques. Nous postulons donc que la perte des DC, et non la signalisation de l’IL-7 sur les DC, est le facteur limitant la PH des lymphocytes T CD4+ durant la GVHD.

Studies on IL-18 in HIV infection : effects of the cytokine on intestinal integrity, and platelets as a new source of the cytokine

L'interleukine IL-18 (IL-18), un membre de la famille de l’IL-1, est une cytokine pro-inflammatoire multifonctionnelle. Elle est produite par les monocytes, les macrophages, les cellules dendritiques, les cellules épithéliales, les kératinocytes et le cortex surrénal dans le corps humain. Cette cytokine est d'abord produite comme une protéine précurseure inactive, qui est par la suite clivée en une forme mature par la caspase-1 activée. La caspase, en elle-même, existe comme précurseur inactif dans les cellules humaines et requiert l'assemblage d'inflammasomes pour son activation. L'IL-18 pour joue un rôle clé dans la médiation des conditions inflammatoires. Notre laboratoire et d'autres ont montré que l'infection par le VIH est accompagnée d'une augmentation des taux circulants d'IL-18 avec une diminution des niveaux de son antagoniste, l'interleukine-18 binding protein (IL-18BP). Dans cette thèse, nous démontrons pour que l'IL-18 est également produite et sécrétée par les plaquettes humaines lors de leur activation. Les plaquettes contiennent des composants de l'inflammasome. Ils assemblent et activent la caspase-1, qui ensuite traite le précurseur de l'IL-18 dans sa forme mature au cours du processus d'activation des plaquettes. La cytokine est synthétisée de novo lors de l'activation des plaquettes. Contrairement à l'IL-18, les plaquettes expriment constitutivement l’IL-18BP, et la libèrent de manière constitutive, ainsi que lors de l'activation. L'IL-18 et l'IL-18BP sont colocalisés avec CD63, un marqueur pour les granules α des plaquettes. L'IL-18 libéré des plaquettes constitue la source principale de cette cytokine dans la circulation humaine chez les individus sains. Nous avons identifié des concentrations faibles de cette cytokine dans les lysats de plaquettes chez les individus infectés par le VIH par rapport à ceux en santé. D'autre part, les concentrations ont été augmentées dans le sérum et le plasma pauvre en plaquettes chez les individus infectés. Des résultats similaires ont été obtenus avec l'IL-18BP dans les lysats de plaquettes d'individus sains et infectés par le VIH. Cependant, des quantités plus faibles de cet antagoniste ont été trouvées dans le sérum et le plasma pauvre en plaquettes d'individus infectés par le VIH par rapport à ceux en santé. Nos résultats ont des implications importantes pour les maladies inflammatoires chroniques dans laquelle une activité accrue de l'IL-18 joue un rôle pathogène. Le VIH est également accompagné par une inflammation intestinale et une diminution de l'intégrité intestinale, mesurée par la réparation de la muqueuse, la régénération et la perméabilité. Cependant, on en sait peu sur la relation entre le niveau élevé de l'IL-18 associé à l'infection au VIH et la perméabilité intestinale: ceci n'a jamais été étudié. Dans cette thèse, nous démontrons le rôle du virus et sa protéine Tat à augmenter la production d'IL-18 chez deux lignées de cellules épithéliales intestinales (HT29 et Caco2) ainsi qu'une diminution de l'IL-18BP. L'IL-18 induit une hyperperméabilité de la barrière épithéliale en perturbant à la fois les jonctions serrées et adhérentes, et ce, en modulant l'expression et la distribution de l'occludine, de claudine-2 et de la bêta-caténine. Une désorganisation de l'actine F a également été observée dans les cellules lors de l'incubation avec l'IL-18. Les mêmes observations ont été faites avec la protéine Tat du VIH-1. Après une incubation prolongée, l'IL-18 a causé la mort des cellules intestinales et induit l'apoptose par l'activation de la caspase-1 et la caspase-3. Fait intéressant, les taux plasmatiques de lipopolysaccharides chez trois catégories différentes de patients au VIH (ART-naïf, ART-traitée et contrôleurs élite) sont en corrélation avec les niveaux plasmatiques de l'IL-18. Enfin, nous avons étudié la voie de signalisation à travers laquelle l'IL-18 induit une perméabilité intestinale accrue. En bref, nos études identifient les plaquettes comme une source importante d'IL-18, et leur activation lors d'une infection à VIH contribue à des concentrations accrues de cette cytokine. Le virus entraine également l'augmentation de la production de cytokines par les cellules épithéliales intestinales. L'activité biologique accrue de ces cytokines contribue à la pathogenèse du sida en augmentant la perméabilité intestinale et en causant la mort des cellules intestinales. L'IL-18 pourrait servir de cible moléculaire pour retarder la progression du sida et réduire l'inflammation chronique dans un stade précoce d'une infection à VIH.

ADRENERGIC RECEPTOR GENE EXPRESSION DURING PANCREATIC REGENERATION AND INSULIN SECRETION IN RATS –

In the present study, the changes in the brain EPI (Epinephrine), adrenergic receptors and the receptor gene expression were investigated during pancreatic regeneration and insulin secretion. The changes in the pancreatic islet EPI and adrenergic receptors were also studied in the pancreatectomised rats. The regulatory function of EPI in association with Epidermal growth factor (EGF) and glucose were investigated in rat islet cultures. In vitro studies were carried out using antagonists for adrenergic receptor subtypes to see their involvement in the islet DNA synthesis. The mechanism by which the peripheral EPI regulate insulin secretion was also investigated by studying the nuclear binding proteins in the pancreatic islets during pancreatic regeneration and diabetes. The study reveals that EPI can regulate the pancreatic islet cell proliferation by controlling the insulin synthesis and secretion. The brain adrenergic receptor gene expression and functional correlation regulate the pancreatic adrenergic receptors. The functional balance of α and β-adrenergic receptors controls the insulin secretion and pancreatic β-cell proliferation, which will have immense clinical significance in the treatment of Diabetes mellitus.

Hypothalamic 5-HT functional regulation through 5-HTIA and 5-HT2c receptors during pancreatic regeneration

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