Can a pit-bull and a cat become friendly?

My buddy has a 2 year old pit who is a little high strung, but for the most part just your average puppy. I have a 2 year old cat who is very laid back and animal friendly. My buddy and I just became roommates. He has kept his pit upstairs, seperated from both my cat and his. I am a firm believer that any dog, pit or not, if brought up right can be normalised with other people and animals. Am I wrong? Are pit-bulls naturalyy pre-disposed to being animal agressive? Also he keeps the dog seperated from just about everyone else as well. Besides one other roommate, me, and himself we have a nother roomate that the dog is aggressive towards. My thought is that by isolating the dog, he is de-socializing it and reinforcing aggressive behavior. Instead of working with the dog to help curb this over-energitic aggressiveness, he just keeps it isolated. Any suggestions regarding how my buddy is raising his dog? Also, any suggestions regarding a successful introduction between my cat