Abstract: The present invention generally relates to methods, compositions and uses thereof for enhancing vascularization of a tissue or cell transplant for transplantation into a subject. In particular, one aspect of the present invention provides methods and compositions comprising the use of a population of stromal vascular fraction (SVF) cells to encapsulate or surround a tissue or cell transplant to enhance vascularization of the tissue or cell transplant. Another aspect of the present invention provides methods and compositions for enhancing vascularization of a tissue or cell transplant by combining a population of SVF cells with a tissue or cell transplant to form a transplant mixed with SVF cells. In some embodiments, the SVF cells can be on the surface or embedded within a three-dimensional matrix. In some embodiments, the SVF cells can be generically engineered to secrete therapeutic proteins or pro-angiogenic factors.