| 20090131309 | ICA512 COUPLES INSULIN SECRETION AND GENE EXPRESSION IN BETA-CELLS - The present invention relates to a method for stimulating expression of peptide hormones in peptide-hormone secreting endocrine cells or neurons comprising the step of promoting in said cells or neurons the presence or activity (aa) of (i) ICA512; or (ii) a derivative thereof having ICA512 function; or (iii) a fragment of ICA512 that may be cleaved by μ-calpain giving rise to a C-terminal fragment of ICA512 wherein said C-terminal fragment has the capability of being targeted to the nucleus; or (iv) a derivative of said fragment of (iii) that may be cleaved by μ-calpain giving rise to a derivative of said C-terminal fragment of ICA512 wherein said derivative of said C-terminal fragment has the capability of being targeted to the nucleus; or (v) a fragment or derivative of ICA512 that may be cleaved by μ-calpain giving rise to a C-terminal fragment of ICA512 or derivative thereof wherein said C-terminal fragment or derivative thereof has the capability of interacting with a PIAS protein in said cells or neurons; or (vi) a fragment or derivative of ICA512 that may be cleaved by μ-calpain giving rise to a C-terminal fragment of ICA512 or derivative thereof wherein said C-terminal fragment or derivative thereof has the capability of enhancing the nuclear levels, or tyrosine phosphorylation, or DNA binding activity of STATs in said cells or neurons; or (vii) a pro-form of any one of (i) to (vi); and (ab) optionally of μ-calpain or a fragment or derivative thereof having μ-calpain function; or (b) of a C-terminal fragment of ICA512 or a derivative thereof which has the capability of being targeted to the nucleus or which has the capability of interacting with a PIAS protein or of enhancing the nuclear levels, or tyrosine phosphorylation, or DNA binding activity of STATs in said cells or neurons. Additionally, the present invention relates to a method of promoting cell proliferation of peptide-hormone secreting endocrine cells or neurons comprising the step of promoting in said cells or neurons the presence or activity (aa) of (i) ICA512; or (ii) a derivative thereof having ICA512 function; or (iii) a fragment of ICA512 that may be cleaved by μ-calpain giving rise to a C-terminal fragment of ICA512 wherein said C-terminal fragment has the capability of being targeted to the nucleus; or (iv) a derivative of said fragment of (iii) that may be cleaved by μ-calpain giving rise to a derivative of said C-terminal fragment of ICA512 wherein said derivative of said C-terminal fragment has the capability of being targeted to the nucleus; or (v) a fragment or derivative of ICA512 that may be cleaved by μ-calpain giving rise to a C-terminal fragment of ICA512 or derivative thereof wherein said C-terminal fragment or derivative thereof has the capability of interacting with a PIAS protein in said cells or neurons; or (vi) a fragment or derivative of ICA512 that may be cleaved by μ-calpain giving rise to a C-terminal fragment of ICA512 or derivative thereof wherein said C-terminal fragment or derivative thereof has the capability of enhancing the nuclear levels, or tyrosine phosphorylation, or DNA binding activity of STATs in said cells or neurons; or (vii) a pro-form of any one of (i) to (vi); and (ab) optionally of μ-caipain or a fragment or derivative thereof having μ-calpain function; or (b) of a C-terminal fragment of ICA512 or a derivative thereof which has the capability of being targeted to the nucleus or which has the capability of interacting with a PIAS protein or of enhancing the nuclear levels, or tyrosine phosphorylation, or DNA binding activity of STATs in said cells or neurons. It is preferred in accordance with the invention that said endocrine cells are β-cells and that said peptide hormone is insulin. | 05-21-2009 |
