169 results about "Cell binding" patented technology

The present invention discloses a method for targeting maytansinoids to a selected cell population, the method comprising contacting a cell population or tissue suspected of containing the selected cell population with a cell-binding agent maytansinoid conjugate, wherein one or more maytansinoids is covalently linked to the cell-binding agent via a non-cleavable linker and the cell-binding agent binds to cells of the selected cell population.

Disclosed is a method of making conjugates of cell binding agents and small molecule drugs comprising reacting a cell binding agent with a bifunctional cross-linking moiety to thereby provide the cell binding agent with a reactive disulfide group and then reacting the modified cell binding agent with a small molecule drug comprising a free thiol group. Bifunctional cross-linking moieties are also disclosed.

Charged or pro-charged cross-linking moieties and conjugates of cell binding agents and drugs comprising the charged or pro-charged cross-linking moieties and method of making the same.

The present invention discloses a one-step process for the production of cytotoxic conjugates of maytansinoids and cell binding agents. Maytansinoids having a disulfide linker that bears a reactive moiety are linked to cell binding agents, such as antibodies, without prior modification of the cell binding agent. These conjugates are useful as therapeutic agents which are delivered specifically to target cells and are cytotoxic.

The invention provides a process for preparing a conjugate comprising a cell binding agent chemically coupled to a drug. The process comprises covalently attaching a linker to a cell binding agent, which then is conjugated to a drug, as well as purification and holding steps, and optionally a tangential flow filtration (TFF) step.

This invention describes a method of conjugating a cell binding agent such as an antibody with an effector group (e.g., a cytotoxic agent) or a reporter group (e.g., a radionuclide), whereby the reporter or effector group is first reacted with a bifunctional linker and the mixture is then used without purification for the conjugation reaction with the cell binding agent. The method described in this invention is advantageous for preparation of stably-linked conjugates of cell binding agents, such as antibodies with effector or reporter groups. This conjugation method provides in high yields conjugates of high purity and homogeneity that are without inter-chain cross-linking and inactivated linker residues

The present invention involves the fabrication and use of biocompatible polymers that are injected percutaneously into the inner portion of a defective region of a spinal disc and swell or expand or subsequently cure in situ to form a disc nucleus prosthesis. The polymers may be synthetic or natural (e.g., collagen), and may be provided in forms including, but not limited to hydrogels, compressible foams, cords, balloons, etc. Subsequent to injection into a target space or void within the disc, one or more cell binding agents, growth factors, and/or drugs on or within the cured polymer then interact with the remaining portion of the disc to support tissue ingrowth and to achieve a higher probability of biological mimicking.

Methods and compositions for the development of effective cancer therapies using mitotic inhibitors which have limited general toxicity to normal, non-cancerous cells and tissues are provided. The methods and compositions utilize cytotoxic compounds comprised of a cell-binding agent (e.g., antibodies) conjugated to an anti-mitotic compound (e.g., maytansinoids). The invention further provides antibodies which are substantially incapable of inducing antibody-dependent cell-mediated cytotoxicity (ADCC) and/or complement dependent cytotoxicity (CDC), thereby ensuring that the therapeutic effect is mediated primarily by the anti-mitotic component of the cytotoxic compound, rather than by indirect cell killing via ADCC and/or CDC. The antibodies of the invention further are capable of differentiating between polypeptide antigens which are more highly expressed on proliferating cancer cells as compared to proliferating non-cancer cells.

The invention provides a process for preparing a cell-binding agent chemically coupled to a drug. The process comprises covalently attaching a linker to a cell-binding agent, a purification step, conjugating a drug to the cell-binding agent and a subsequent purification step.

Implantable materials having defined patterns of affinity regions for binding endothelial cells and providing for directed endothelial cell migration across the surface of the material. The affinity regions include photochemically altered regions of a material surface and physical members patterned on the material surface that exhibit a greater affinity for endothelial cell binding and migration than the remaining regions of the material surface.

The invention concerns a cell support comprising an RGD-enriched gelatine that has a more even distribution of RGD sequences than occurring in a natural gelatine and with a minimum level of RGD sequences. More precise the percentage of RGD sequences related to the total number of amino acids is at least 0.4 and if the RGD-enriched gelatine comprises 350 amino acids or more, each stretch of 350 amino acids contains at least one RGD motif. Preferably the RGD-enriched gelatines are prepared by recombinant technology, and have a sequence that is derived from a human gelatine or collagen amino acid sequence. The invention also relates to RGD-enriched gelatines that are used for attachment to integrins. In particular The RGD-enriched gelatines of the invention are suitable for coating a cell culture support for growing anchordependant cell types. Further, the RGD-enriched gelatines of the invention may find use in medical applications, in particular as a coating on implant or transplant material or as a component of drug delivery systems.

The present application relates to compositions of modified diphtheria toxin and fusion proteins containing modified diphtheria toxin that reduce binding to vascular endothelium or vascular endothelial cells, and therefore, reduce the incidence of Vascular Leak Syndrome, as well as methods of making the compositions. The present application also relates to a polypeptide toxophore from a modified diphtheria toxin, where the modification is at least one amino acid residue at the amino acid residues 6-8, 28-30 or 289-291 of an unmodified native diphtheria toxin. Also described are fusion proteins which contain a modified diphtheria toxin and a non-diphtheria toxin fragment which contains a cell binding portion. The modified diphtheria toxins described can be used for the treatment of a malignant disease or a non-malignant disease.

A method is described for treating a specimen of semen containing sperm cells to increase the relative number of sperm cells of a desired sex type in a treated specimen to increase the potential for conceiving an offspring of the desired sex. A specimen of semen is treated after a predetermined time to increase the relative ability of a at least a portion of the semen to conceive an offspring of the desired sex. The treatment preferably comprises contacting the sperm cells with an agent that preferentially effects sperm cells of a selected sex type. In some preferred embodiments, the semen is separated into two components. A first component has a higher number of sperm of the desired sex type than sperm of a non desired sex type and a second component has a higher number of sperm of the non desired sex type relative to sperm of the desired sex type. In one embodiment, the separating step is performed after a predetermined percent of the sperm cells exhibit a punctate pattern, which is capable of determination by labeling the sperm cells with Koo antibody and determining the percent of cells labeled. In another embodiment, the separating step is performed after waiting for a time determined by locating a maximum in the curve obtained by plotting percent female cells determined by FISH against percent Koo positive cells, determining the time at which the maximum percent female cells occurs, and beginning the following step no earlier than about one hour before the time of the maximum percent female cells. In yet another embodiment, the separating step is performed after waiting for a period of time between about 2 hours and about 24 hours after collection of the ejaculate. Preferably, in the separating step, the sperm is contacted with a cell binding agent, permitting the sperm of the non desired sex type to preferentially bind to the cell binding agent, and the cell binding agent with preferentially bound sperm of the non desired sex type is separated from non bound sperm.

The invention discloses a method for targeting maytansinoids to a selected cell population, the method comprising: contacting a cell population suspected of containing the selected cell population with a cell-binding agent maytansinoid conjugate or tissue, wherein one or more maytansinoids are covalently linked to the cell-binding agent through a non-cleavable linker, and the cell-binding agent binds cells in a selected cell population.

Bioerodable devices such as stents containing one or more endothelial cell binding agents are provided.

The invention provides processes for manufacturing cell-binding agent-cytotoxic agent conjugates of improved stability comprising performing the modification reaction at a high pH. The inventive processes comprise contacting a cell-binding agent with a bifunctional crosslinking reagent in a solution having a pH of 7.1 to 9 to covalently attach a linker to the cell-binding agent and thereby prepare a mixture comprising cell-binding agents having linkers bound thereto.

Adenovirus serotypes differ in their natural tropism. The adenovirus serotypes 2, 4, 5 and 7 all have a natural affiliation towards lung epithelia and other respiratory tissues. In contrast, serotypes 40 and 41 have a natural affiliation towards the gastrointestinal tract. The serotypes described differ in at least capsid proteins (penton-base, hexon), proteins responsible for cell binding (fiber protein), and proteins involved in adenovirus replication. This difference in tropism and capsid protein among serotypes has led to the many research efforts aimed at redirecting the adenovirus tropism by modification of the capsid proteins.

The present invention is related to novel cytotoxic agents, pyrrolo[2,1-c][1,4]benzodiazepine (PBD) derivatives, their conjugates with a cell-binding agent, the preparation and the therapeutic uses in the targeted treatment of cancers, autoimmune disorders, and infectious diseases.