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2228 results about "Fibrocyte" patented technology

A fibrocyte is an inactive mesenchymal cell, that is, a cell showing minimal cytoplasm, limited amounts of rough endoplasmic reticulum and lacks biochemical evidence of protein synthesis. The term fibrocyte contrasts with the term fibroblast. Fibroblasts are activated connective tissue cells characterized by synthesis of proteins of the fibrous matrix, particularly the collagens. When tissue is injured, the predominant mesenchymal cells, the fibroblast, have been believed to be derived from the fibrocyte or possibly from smooth muscle cells lining vessels and glands. Commonly, fibroblasts express smooth muscle actin, a form of actin first found in smooth muscle cells and not found in resting fibrocytes. Fibroblasts expressing this form of actin are usually called "myo-fibroblasts."

Particulate acellular tissue matrix

A method of processing an acellular tissue matrix to give a particulate acellular tissue matrix includes: cutting sheets of dry acellular tissue matrix into strips; cryofracturing the dry acellular tissue matrix strips at cryogenic temperatures; separating the resulting particles by size at cryogenic temperatures; and freeze drying the fraction of particles desired size to remove any moisture that may have been absorbed to give a dry particulate acellular tissue matrix. Rehydration of the dry particulate acellular tissue matrix may take place just prior to use. The particulate acellular tissue may be applied to a recipient site, by way of injection, spraying, layering, packing, in-casing or combinations thereof. The particulate acellular tissue may further include growth and stimulating agents selected from epidermal growth factor, fibroblast growth factor, nerve growth factor, keratinocyte growth factor, platelet derived growth factor, vasoactive intestinal peptide, stem cell factor, bone morphogetic proteins, chondrocyte growth factor and combinations thereof. Other pharmaceutically active compounds may be combined with the rehydrated particulate material including: analgesic drugs; hemostatic drugs; antibiotic drugs; local anesthetics and the like to enhance the acceptance of the implanted particulate material. The particulate material product may also be combined with stem cells selected from mesenchymal stem cells, epidermal stem cells, cartilage stem cells, hematopoietic stem cells and combinations thereof.
Owner:LIFECELL

Graft collar and scaffold apparatuses for musculoskeletal tissue engineering and related methods

This application describes apparatuses and methods for musculoskeletal tissue engineering. Specifically, graft collar and scaffold apparatuses are provided for promoting fixation of musculoskeletal soft tissue to bone.This application provides for graft collars comprising biopolymer mesh and / or polymer-fiber mesh for fixing tendon to bone. In one aspect, the graft collar comprises more than one region, wherein the regions can comprise different materials configured to promote integration of and the regeneration of the interfacial region between tendon and bone.This application also provides for scaffold apparatuses and methods for fixing musculoskeletal soft tissue to bone. The scaffold apparatus is multiphasic, preferably triphasic, and each phase is configured promote growth and proliferation of a different cell and its associated tissue. In one aspect, the scaffold apparatus is triphasic, with phases comprising materials to promote growth and proliferation of fibroblasts, chondroblasts, and osteoblasts. In addition, an apparatus comprising two portions, each of said portion being the scaffold apparatus described above is provided, wherein each of said portion encases one end of a soft tissue graft. Further, a triphasic interference screw is provided.This application further provides apparatuses and methods for inducing formation of fibrocartilage comprising wrapping a graft collar with polymer-fiber mesh configured to apply compression to the graft collar. In another aspect, the polymer-fiber is applied directly to the graft to apply compression to the graft.
Owner:THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK

Methods and compositions based on inhibition of cell invasion and fibrosis by anionic polymers

The present invention relates to the discovery that biocompatible anionic polymers can effectively inhibit fibrosis, scar formation, and surgical adhesions. The invention is predicated on the discovery that anionic polymers effectively inhibit invasion of cells associated with detrimental healing processes, and in particular, that the effectiveness of an anionic polymer at inhibiting cell invasion correlates with the anionic charge density of the polymer. Thus the present invention provides a large number of materials for use in methods of inhibiting fibrosis and fibroblast invasion. Anionic polymers for use in the invention include but are not limited to natural proteoglycans, and the glycosaminoglycan moieties of proteoglycans. Additionally, anionic carbohydrates and other anionic polymers may be used. The anionic polymers dextran sulfate and pentosan polysulfate are preferred. In a more preferred embodiment, dextran sulfate, in which the sulfur content is greater than about 10% by weight, may be used. In a more preferred embodiment, the average molecular weight is about 40,000 to 500,000 Daltons. The present invention provides compositions and methods to inhibit fibrosis and scarring associated with surgery. The invention further provides compositions and methods to inhibit glial cell invasion, detrimental bone growth and neurite outgrowth. In a preferred embodiment, the inhibitory compositions further comprise an adhesive protein.
Owner:TRIAD

Tissue-like organization of cells and macroscopic tissue-like constructs, generated by macromass culture of cells, and the method of macromass culture

Three-dimensional tissue-like organization of cells by high cell-seeding-density culture termed as macromass culture is described. By macromass culture, cells can be made to organize themselves into a tissue-like form without the aid of a scaffold and three-dimensional macroscopic tissue-like constructs can be made wholly from cells. Tissue-like organization and macroscopic tissue-like constructs can be generated from fibroblastic cells of mesenchymal origin (at least), which can be either differentiated cells or multipotent adult stem cells. In this work, tissue-like organization and macroscopic tissue-like constructs have been generated from dermal fibroblasts, adipose stromal cells-derived osteogenic cells, chondrocytes, and from osteoblasts. The factor causing macroscopic tissue formation is large scale culture at high cell seeding density per unit area or three-dimensional space, that is, macromass culture done on a large scale. No scaffold or extraneous matrix is used for tissue generation, the tissues are of completely cellular origin. No other agents (except high cell-seeding-density) that aid in tissue formation such as tissue-inducing chemicals, tissue-inducing growth factors, substratum with special properties, rotational culture, etc, are employed for tissue formation. These tissue-like masses have the potential for use as tissue replacements in the human body. Tissue-like organization by high cell-seeding-density macromass culture can also be generated at the microscopic level.
Owner:RELIANCE LIFE SCI PVT
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