When we look at policy for Pinterest, you should keep in mind the same considerations as a Facebook policy:
Point-of-Contact: Your company should determine one person or a team internally that can handle all Instagram interaction.
Content: Your company should determine a policy stating which employees post on behalf of the company to ensure that there is no confusion on who can represent the company's interests. This should also include a policy on whether or not employees are allowed to respond to any comments on pins through their personal profiles.
Comment Response: Your company should create a protocol on who responds to pin comments and how negative responses are handled. Some companies will not post negative comments; others see negative comments as opportunities to engage in a discussion that can change mindsets by posting and responding appropriately. If you delete negative comments, you might find that followers will lash out.