Compositions comprising a therapeutic agent encapsulated by an edible plant-derived microvesicle are provided. Methods of treating an inflammatory disorder and methods of treating a cancer are further provided and include administering an effective amount of a composition comprising a therapeutic agent encapsulated by an edible plant-derived microvesicle to a subject. Further provided are methods of diagnosing a colon cancer that include the steps of administering an edible plant-derived microvesicle incorporating a detectable label to a subject and then determining an amount of the detectable label in an intestine of the subject.
