If an element visually appears as a heading and functions as a heading, it must be marked-up as a heading. Just as sighted users, users of assisstive technology rely on headings to navigate the page. Developers should have one <h1> on the page. Consider the heading structure like an outline using the hierarchy appropriately.
<div style="font-weight: bold; font-size: 150%">Latest News</div> <h2>Latest News</h2>