Abstract: It has now been discovered that activated lymphocyte cell adhesion molecule (ALCAM)—also known as CD166—is the ligand of the innate immune receptor ILT3 that is expressed by DC and monocytes. It has been further discovered that the specific binding of ILT3 to its ligand CD166 on the surface of CD166-expressing cancer cells, arrested cancer cell growth and initiated apoptosis. Therefore, certain embodiments relate to methods and compositions for treating CD166-expressing cancers by administering ILT3Fc, full-length ILT3 or any CD166 ligand-binding fragment thereof.

Abstract: The present invention relates to methods of using the expression of ILTL3 ligand or ILT3 on certain types of cancer cells as a diagnostic tool. Methods are provided for treating ILT3-ligand expressing cancers, such as T-cell acute lymphoblastic leukemia (T-cell acute lymphoblastic leukemia), for example by administering ILT3, the extracellular domain of ILT3 or ILT3Fc conjugated to a cytotoxic agent to kill the targeted cancer cell. Other methods are provided for treating cancers that express ILT3 on their surface, such as monocytic forms of AML, for example by administering anti-ILT3 antibodies conjugated to a cytotoxic agent.

Abstract: It has now been discovered that activated lymphocyte cell adhesion molecule (ALCAM)-also known as CD166-is the ligand of the innate immune receptor ILT3 that is expressed by DC and monocytes. It has been further discovered that the specific binding of ILT3 to its ligand CD166 on the surface of CD166-expressing cancer cells, arrested cancer cell growth and initiated apoptosis. Therefore, certain embodiments relate to methods and compositions for treating CD166-expressing cancers by administering ILT3Fc, full-length ILT3 or any CD166 ligand-binding fragment thereof.

Abstract: This invention provides a method for inhibiting the rejection of transplanted islet cells, comprising administering to the subject a polypeptide comprising all or a portion of the extracellular domain of ILT3, wherein the polypeptide is water soluble. This invention further provides a method of treating diabetes, by inhibiting the rejection of transplanted islet cells through the administration of the polypeptide to the subject.

Abstract: The present invention relates to methods of using the expression of ILTL3 ligand or ILT3 on certain types of cancer cells as a diagnostic tool. Methods are provided for treating ILT3-ligand expressing cancers, such as T-cell acute lymphoblastic leukemia (T-cell acute lymphoblastic leukemia), for example by administering ILT3, the extracellular domain of ILT3 or ILT3Fc conjugated to a cytotoxic agent to kill the targeted cancer cell. Other methods are provided for treating cancers that express ILT3 on their surface, such as monocytic forms of AML, for example by administering anti-ILT3 antibodies conjugated to a cytotoxic agent.

Abstract: The present invention relates to methods of using the expression of ILTL3 ligand or ILT3 on certain types of cancer cells as a diagnostic tool. Methods are provided for treating ILT3-ligand expressing cancers, such as T-cell acute lymphoblastic leukemia (T-cell acute lymphoblastic leukemia), for example by administering ILT3, the extracellular domain of ILT3 or ILT3Fc conjugated to a cytotoxic agent to kill the targeted cancer cell. Other methods are provided for treating cancers that express ILT3 on their surface, such as monocytic forms of AML, for example by administering anti-ILT3 antibodies conjugated to a cytotoxic agent.

Abstract: This invention provides a method for inhibiting the rejection of transplanted islet cells, comprising administering to the subject a polypeptide comprising all or a portion of the extracellular domain of ILT3, wherein the polypeptide is water soluble. This invention further provides a method of treating diabetes, by inhibiting the rejection of transplanted islet cells through the administration of the polypeptide to the subject.

Abstract: This invention provides a first polypeptide comprising all or a portion of the extracellular domain of ILT3, wherein the polypeptide is water-soluble and does not comprise the Fc portion of an immunoglobulin. This invention also provides a second polypeptide comprising (i) all or a portion of the extracellular domain of ILT3 operable affixed to (ii) the Fc portion of an immunoglobulin, wherein the Fc portion of the immunoglobulin comprises a function-enhancing mutation, and wherein the polypeptide is water-soluble. This invention further provides a third polypeptide comprising (i) all or a portion of the extracellular domain of ILT3 operable affixed to (ii) a transmembrane domain. This invention further provides related nucleic acids, expression vectors, host vector systems, compositions, and articles of manufacture and therapeutic and prophylactic methods using the polypeptides of the invention.

Abstract: This invention provides a method for inhibiting the rejection of transplanted islet cells, comprising administering to the subject a polypeptide comprising all or a portion of the extracellular domain of ILT3, wherein the polypeptide is water soluble. This invention further provides a method of treating diabetes, by inhibiting the rejection of transplanted islet cells through the administration of the polypeptide to the subject.

Abstract: The present invention relates to methods of using the expression of ILTL3 ligand or ILT3 on certain types of cancer cells as a diagnostic tool. Methods are provided for treating ILT3-ligand expressing cancers, such as T-cell acute lymphoblastic leukemia (T-cell acute lymphoblastic leukemia), for example by administering ILT3, the extracellular domain of ILT3 or ILT3Fc conjugated to a cytotoxic agent to kill the targeted cancer cell. Other methods are provided for treating cancers that express ILT3 on their surface, such as monocytic forms of AML, for example by administering anti-ILT3 antibodies conjugated to a cytotoxic agent.

Abstract: This invention provides a method for inhibiting the rejection of transplanted islet cells, comprising administering to the subject a polypeptide comprising all or a portion of the extracellular domain of ILT3, wherein the polypeptide is water soluble. This invention further provides a method of treating diabetes, by inhibiting the rejection of transplanted islet cells through the administration of the polypeptide to the subject.

Abstract: This invention provides a first polypeptide comprising all or a portion of the extracellular domain of ILT3, wherein the polypeptide is water-soluble and does not comprise the Fc portion of an immunoglobulin. This invention also provides a second polypeptide comprising (i) all or a portion of the extracellular domain of ILT3 operable affixed to (ii) the Fc portion of an immunoglobulin, wherein the Fc portion of the immunoglobulin comprises a function-enhancing mutation, and wherein the polypeptide is water-soluble. This invention further provides a third polypeptide comprising (i) all or a portion of the extracellular domain of ILT3 operable affixed to (ii) a transmembrane domain. This invention further provides related nucleic acids, expression vectors, host vector systems, compositions, and articles of manufacture and therapeutic and prophylactic methods using the polypeptides of the invention.

Abstract: This invention provides a method for inhibiting the rejection of transplanted islet cells, comprising administering to the subject a polypeptide comprising all or a portion of the extracellular domain of ILT3, wherein the polypeptide is water soluble. This invention further provides a method of treating diabetes, by inhibiting the rejection of transplanted islet cells through the administration of the polypeptide to the subject.

Abstract: This invention provides a first polypeptide comprising all or a portion of the extracellular domain of ILT3, wherein the polypeptide is water-soluble and does not comprise the Fc portion of an immunoglobulin. This invention also provides a second polypeptide comprising (i) all or a portion of the extracellular domain of ILT3 operable affixed to (ii) the Fc portion of an immunoglobulin, wherein the Fc portion of the immunoglobulin comprises a function-enhancing mutation, and wherein the polypeptide is water-soluble. This invention further provides a third polypeptide comprising (i) all or a portion of the extracellular domain of ILT3 operable affixed to (ii) a transmembrane domain. This invention further provides related nucleic acids, expression vectors, host vector systems, compositions, and articles of manufacture and therapeutic and prophylactic methods using the polypeptides of the invention.

Abstract: This invention provides a method for inhibiting the rejection of transplanted islet cells, comprising administering to the subject a polypeptide comprising all or a portion of the extracellular domain of ILT3, wherein the polypeptide is water soluble. This invention further provides a method of treating diabetes, by inhibiting the rejection of transplanted islet cells through the administration of the polypeptide to the subject.

Abstract: This invention provides a method of treating a subject afflicted with a disease, comprising withdrawing blood from the subject, treating the withdrawn blood so as to remove sILT3 from the blood, and returning the treated blood to the subject, thereby treating the subject afflicted with the disease. This invention also provides the above method, further comprising administering an anti-ILT3 antibody to the subject. The invention also provides a method of treating a subject afflicted with a disease, comprising administering to the subject an anti-ILT3 antibody, thereby treating the subject. In one embodiment, the disease is chronic viral disease. In another embodiment, the disease is cancer.

Abstract: This invention provides a first polypeptide comprising all or a portion of the extracellular domain of ILT3, wherein the polypeptide is water-soluble and does not comprise the Fc portion of an immunoglobulin. This invention also provides a second polypeptide comprising (i) all or a portion of the extracellular domain of ILT3 operable affixed to (ii) the Fc portion of an immunoglobulin, wherein the Fc portion of the immunoglobulin comprises a function-enhancing mutation, and wherein the polypeptide is water-soluble. This invention further provides a third polypeptide comprising (i) all or a portion of the extracellular domain of ILT3 operable affixed to (ii) a transmembrane domain. This invention further provides related nucleic acids, expression vectors, host vector systems, compositions, and articles of manufacture and therapeutic and prophylactic methods using the polypeptides of the invention.