The present invention provides a method for diagnosing and detecting diseases associated with pancreas. The present invention provides one or more proteins or fragments thereof, peptides or nucleic acid molecules differentially expressed in pancreatic diseases (PCAT) and antibodies binds to PCAT. The present invention provides that PCAT is used as targets for screening agents that modulates the PCAT activities. Further, the present invention provides methods for treating diseases associated with pancreas.

Methods for treating obesity are provided and include administering a polypeptide antagonist of a Na/K ATPase/Src receptor complex to a subject in need thereof. Methods for reducing adiposity and adipogenesis are also provided and make use of a polypeptide antagonist of a Na/K ATPase/Src receptor complex to a subject.

The present invention relates to a method for diagnosing a disease, comprising the step detecting in a sample an autoantibody binding to the alpha 3 subunit of the human neuronal Na(+)/K(+) ATPase, an isolated and/or recombinant polypeptide comprising the alpha 3 subunit of the human neuronal Na(+)/K(+) ATPase, a use of a membrane-associated human Na(+)/K(+) ATPase or a variant thereof for the diagnosis of a disease, an isolated and/or recombinant polypeptide comprising the alpha 3 subunit of the human neuronal Na(+)/K(+) ATPase or a variant thereof, for use in the treatment of a disease, an autoantibody binding to said polypeptide and a method for isolating such autoantibody, a pharmaceutical composition, medical or diagnostic device or test kit comprising the polypeptide.

Expression vectors are provided that comprise a nucleic acid sequence encoding a polypeptide antagonist of a Na/K ATPase/Src receptor complex. The nucleic acid encoding the polypeptide antagonist is operatively linked to a promoter for expressing the polypeptide antagonist in a specific cell or tissue. Viral particles, target cells, and pharmaceutical compositions are also provided and include the expression vectors. Methods of treating a Src-associated disease is further provided and includes administering the expression vectors encoding the polypeptide antagonist of the Na/K ATPase/Src receptor complex to a subject in need thereof.

The present invention provides a method for diagnosing and detecting diseases associated with pancreas. The present invention provides one or more proteins or fragments thereof, peptides or nucleic acid molecules differentially expressed in pancreatic diseases (PCAT) and antibodies binds to PCAT. The present invention provides that PCAT is used as targets for screening agents that modulates the PCAT activities. Further, the present invention provides methods for treating diseases associated with pancreas.

Methods for treating uremic cardiomyopathy are provided and include the step of administering a polypeptide antagonist of a Na/K ATPase/Src receptor complex to a subject in need thereof. The polypeptide anatagonist can further include a cell penetrating polypeptide. Methods of treating anemia, including anemia-associated with chronic kidney disease, are also provided.

Methods for treating retinopathy are provided and include administering an effective amount of a polypeptide antagovist of a Na/K ATPase/Src receptor complex to a subject. The retinopathy can include diabetic retinopathy. Methods of decreasing angiogenesis in a retinal vasculature are also provided and include the step of administering, such as by intravitreous injection, a polypeptide antagonist of a Na/K ATPase/Src receptor complex to a subject in need thereof.

Methods of inhibiting platelet aggregation using antibodies having binding specificity for the subunit of the (Na.sup.++K.sup.+)-ATPase are provided, along with methods for inhibiting or preventing or treating thrombosis in a subject using such antibodies.

Methods for treating obesity are provided and include administering a polypeptide antagonist of a Na/K ATPase/Src receptor complex to a subject in need thereof. Methods for reducing adiposity and adipogenesis are also provided and make use of a polypeptide antagonist of a Na/K ATPase/Src receptor complex to a subject.

Non-naturally occurring peptides are provided that act as a Src SH2 domain antagonist of cardiotonic steroids. Pharmaceutical compositions comprising the peptides are also provided along with vectors encoding the peptides. Methods of treating a Src-associated disease and reducing Src activity in a cell are further provided and include administering or contacting a cell with an effective amount of the peptide.