Object-oriented database management systems represent a technology in which the concepts of the object-oriented programming paradigm are implemented in databases. The impedance mismatch problem between different technologies (e.g., relational and object-oriented) has represented a challenge for developers and researchers for many years now. With the growing popularity of graph databases, it is important to resolve differences between the concepts of graph theory (used in graph databases) and the object-oriented paradigm. In this paper, we propose an approach for representing graph nodes as objects, and introduce the concept of node inheritance in graph databases, which we demonstrate on a simple showcase.