Methods are provided for the prognosis, diagnosis and treatment of various pathological states, including cancer, chemotherapy resistance and dementia associated with Alzheimer's disease. The methods provided herein are based on the discovery that various proteins with a high level of sialylation are shown herein to be associated with disease states, such as, cancer, chemotherapy resistance and dementia associated with Alzheimer's disease. Such methods provide a lysosomal exocytosis activity profile comprising one or more values representing lysosomal exocytosis activity. Also provided herein, is the discovery that low lysosomal sialidase activity is associated with various pathological states. Thus, the methods also provide a lysosomal sialidase activity profile, comprising one or more values representing lysosomal sialidase activity. A lysosomal sialidase activity profile is one example of a lysosomal exocytosis activity profile.

Provided are inhibitors of Rho GTPase activation, and, in particular, compounds that inhibit RhoA activation by an RhoGEF. Also provided are related pharmaceutical compositions and methods. Also provided are methods of inhibiting Rho GTPase activation. Also provided are methods of screening for compounds that inhibit Rho GTPase activation by a RhoGEF.

Provided are inhibitors of Rho GTPase activation, and, in particular, compounds that inhibit RhoA activation by an RhoGEF. Also provided are related pharmaceutical compositions and methods. Also provided are methods of inhibiting Rho GTPase activation. Also provided are methods of screening for compounds that inhibit Rho GTPase activation by a RhoGEF.

Detecting glycosaminoglycans (GAGs) and/or determining the level of one or more glycosaminoglycans can be useful, e.g., in identifying or monitoring various medical conditions, the status of patients having various medical conditions, and/or the response to treatment of individuals having various medical conditions. The present invention provides methods for detecting glycosaminoglycans and/or determining the level of glycosaminoglycans through the use of, e.g., mass spectrometry.

Detecting glycosaminoglycans (GAGs) and/or determining the level of one or more glycosaminoglycans can be useful, e.g., in identifying or monitoring various medical conditions, the status of patients having various medical conditions, and/or the response to treatment of individuals having various medical conditions. The present invention provides methods for detecting glycosaminoglycans and/or determining the level of glycosaminoglycans through the use of, e.g., mass spectrometry.

β-Lactamase substrates and methods for using the substrates to detect β-lactamase and to diagnose tuberculosis.

β-Lactamase substrates and methods for using the substrates to detect β-lactamase and to diagnose tuberculosis.

The present invention provides photosensitizer compounds for use in detecting beta-lactamase activity. Methods and kits that utilize the photosensitizer compounds of the invention for the detection of, quantitation of, and classification or typing of microbial beta-lactamases.

The present invention provides photosensitizer compounds for use in detecting beta-lactamase activity. Methods and kits that utilize the photosensitizer compounds of the invention for the detection of, quantitation of, and classification or typing of microbial beta-lactamases.

Provided herein are methods for the obtention of an active HBV RNaseH preparation and its use in screening methods to identify potential inhibitors of the enzyme for possible use as therapeutic agents. Also provided are methods of treatment using agents identified according to the screen.