The present invention can be included in the field of medicine. Specifically, the present invention provides antibodies and antigen-binding fragments thereof which can bind isoAsp7 amyloid β (Aβ) and a pharmaceutical composition comprising the antibodies or antigen-binding fragments thereof. IsoAsp7 Aβ can be found in plaques of Alzheimer' s patients and is thus a suitable target for the treatment and/or prevention of Aβ-related diseases such as Alzheimer' s disease. Thus, the antibodies, antigen-binding fragments thereof and the pharmaceutical composition comprising either can be used to treat and/or prevent neurodegenerative diseases. Further, the present invention provides hybridoma cell lines, the use of the antibodies or antigen-binding fragments thereof for the diagnosis and/or prognosis of a neurodegenerative disease and a method for detecting isoAsp7 Aβ in an isolated sample.