Cultural Change without Top Support

Hello

Does anyone have any comments or experience about how it is possible to change the culture within a department without support from the top. In fact the very top may actually be part, in no way all of, the cultural problem.

To explain further:

Cultural issues have been identified such as fear of top, lack of innovation, mistrust, low motivation, negativity

Managers and sample of staff are happy to try to work on this

Senior management who will sanction any action are seen to be part of the problem

The question is whether it is possible to effect any form of cultural change without support from the top?

If anyone has any comments to start this discussion I would be very grateful.