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Results for “Granulation Tissue”

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At least 757 records · Page 42Linked to original sources
PubMed2006

Up-regulation of matrix metalloproteinase-2 and membrane-type 1-matrix metalloproteinase were coupled with that of type I procollagen in granulation tissue response after the onset of aortic dissection.

The pathophysiological significance of matrix metalloproteinases (MMPs) in aortic dissection remains poorly understood. The purpose of the present study is to clarify the significance of MMPs in aortic dissection. The activities and distributions of MMP-2, membrane-type 1-MMP (MT1-MMP), and MMP-9 were evaluated by gelatin zymography, immunohistochemistry, and in situ hybridization in 29 patients and seven autopsy cases. To assess if these MMPs are related to a tissue remodeling process, we compared the expression of these MMPs with that of type I procollagen and platelet-derived growth factor receptor beta chain (PDGF Rbeta). Patients were divided into three groups based on histological findings: acute, intermediate, and healed groups. The most remarkable changes were observed in the intermediate group, in which MMP-2 activity peaked and tissue expression of mRNAs for MMP-2 and MT1-MMP were observed in spindle-shaped cells in the neointima, organizing thrombus, and the adventitia. These expression patterns were essentially coupled with those of type I procollagen mRNA and PDGF-Rbeta protein. The association of MMP-2, MT1-MMP, type I procollagen, and PDGF-Rbeta suggests that MMP-2 and MT1-MMP could be involved not only in the degradation of aortic tissue but also in tissue remodeling, which may be associated with the healing process.

Aged↗
PubMed1975

[Stimulation of fibrillogenesis in granulation tissue].

RNA synthesis by fibroblasts in healing wounds of mice and passage of the newly-formed RNA from the nucleus into the cytoplasm were studied in control mice and those treated by potassium orotate. Potassium orotate accelerated the passage of the RNA from the nucleus into the cytoplasm of the fibroblasts. Formation and maturation of the collagen fibrils in the wounds were studied by scanning electron microscope.

Animals↗
PubMed2001

[Expression and dynamics of peptidergic nerve fibers in granulation tissue after distance osteosynthesis].

The transmitters and/or modulators calcitonin gene-related peptide (CGRP), substance P (SP), neuropeptide Y (NPY) and vasointestinal polypeptide (VIP) are supposed to be involved in bone growth, fracture healing and internal remodeling. Immunohistochemical proof of neuropeptide positive fibers in normal bone let us assume that these substances effect the early phase of fracture healing. Exact time of appearance of neuropeptide positive fibers, localisation in the bone, chemospecifity and mode of genesis are unknown so fare. Research was done on a model of distance osteosynthesis of the rabbit tibia. Primary and secondary antibodies were used for indirect immunohistochemical technique. We put more strength on the concrete stereological calculation of length of the nerve fibers than on a conventional statistical evaluation. After histological preparation of tissue specimens from the interfragmental gap and the bone marrow beside the gap the neuropeptides CGRP, SP and NPY were immunohistochemically expressed. Sprouting of CGRP- and SP-positive nerve fibers has its origin in the bone marrow. A vascularisation in the early state of osteoneogenesis after fracture seems impossible without the nerval peptidergic influence and transmission.

Animals↗
PubMed1981

[Dynamics of the state of the granulation tissue after trauma inflicted at different times of day].

Dynamics on number of fibroblasts and amount of collagenous fibres in the granular tissue of the mouse ear skin was studied after trauma inflicted at 7 a. m., 15 or 23 p. m. The material was taken for 20 days by means of the method for dynamic observation. The cells and fibres were counted by means of the ocular grid (200 knots per 0.33 mm2). The course of the process was approximated according to the method of the least squares, the linear regression equations and according to the method of sliding averages. All stages of the inflammatory reaction after the night operation began with 20-24 hours' retardation if compared with the course of the process after the a. m. and afternoon operations. The fibroblast proliferation in the granular tissue was more active at once, their number increased more quickly. The collagenous fibre amount increased more quickly, too, but steadily during the course of the experiment. The peculiar features of the postoperative reactions to the operations performed at various times of the 24 hours' span were connected with the circadian phase of the organism's state at the time of the operation.

Animals↗
PubMed1981

The role of histamine in wound healing. II. The effect of antagonists and agonists of histamine receptors (H1 and H2) on collagen levels in granulation tissue.

The effects of mepyramine (H1-receptor antagonist), cimetidine (H2-receptor antagonist), IEM-813 (H1-receptor agonist) abd 4-Met-Hi (H2-receptor agonist) on collagenogenesis processes in subcutaneous implanted sponges of rats were studied. Administration into sponges of cimetidine 30 min before histamine injection blocked both the stimulatory effect of low histamine doses and the inhibitory effect of high histamine doses of collagen formation. Low doses of 4-Met-Hi increased collagen levels but reduced the levels at high doses. Mepyramine and IEM-813 did not influence collagen biosynthesis.

Animals↗
PubMed1995

Plasticity of myofibroblasts appearing in granulation tissues after acetic acid treatment. Effect of bFGF.

To clarify the origin of the myofibroblasts appearing in the healing process of the acetic acid-induced ulcer and effect of basic fibroblast growth factor (bFGF) on these myofibroblasts, we conducted an immunohistochemical study using antibody to intermediate filaments, desmin and vimentin. The binding sites of bFGF on the regenerative tissues were also studied by the radioautographic study of soluble compounds. As a result, the binding sites of bFGF were accumulated on the fibroblasts and myofibroblasts as well as on endothelial cells. The effect of CS23, acid-stable human recombinant bFGF was shown on distribution of myofibroblasts and regeneration of the microvascular system in the mucosal and submucosal layers.

Acetates↗
PubMedDate not supplied

[An electron radioautographic study of the vessels in the granulation tissue of long-term nonhealing wounds].

The wounds without healing for a long time (from 1 month to 2 years) were studied histologically and electron-radioautographically. The reduction of the vessel number in such wounds occurs, first, due to degenerative changes in the cells of their walls, and second, due to loss of connection between the cells. Some of these cells retain functional activity (incorporation of 3H-uridine) and capacity for proliferation (incorporation of 3H-thymidine). The latter is particularly characteristic for pericytes, this proving their role as a source of fibroblasts in the stage of organization and formation of the scar.

Adolescent↗
PubMed1983

[Silatranes as stimulators of the development of granulation tissue].

Experiments on rats were made to study the effect of I-(chloromethyl) silatrane and I- (ethoxy) silatrane and that of triethanolamine and chloromethyl triethoxysilane on biochemical parameters of granular-fibrous tissue. The preparations were applied to a wound defect in the form of liniments. Silatranes were found to stimulate proliferation of the cells and to increase their biosynthetic activity, to favour accumulation of collagen and non-collagenic proteins, and reduction of the inflammatory phenomena. The silicon-containing fragment of the silatrane molecule chloromethyl triethoxysilane produced an analogous but less marked action. Triethanolamine containing no silicon was found to be as less active. These data indicate that silicon entering the silatrane grouping is of great importance for the occurrence of its biological activity.

Animals↗