"This is the third editorial attack on journalists' jobs by the company in the last three years," he said.
"In the last round, more than 100 journalists lost their jobs.
"We're talking (about) a very serious threat to overall journalism in West Midlands."
In a statement, the company said: "As a result of a detailed review of the business and in order to ensure a sustainable future for their newspapers and websites, Trinity Mirror's businesses in the Midlands have today announced a number of proposed changes to their organisational structure.
"The proposals include plans for the Trinity Mirror Midlands businesses to work more closely together and for more effective sharing of resources across the region in the editorial and advertising departments."
The statement said a regional production hub and features unit would be set up and some specialist reporter roles would be merged.
Forty five editorial posts are to go.
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