Can injured 49ers' D-Line contain Titans' running game?

Daily 49ers blog for NBC Bay Area website: This week, all three 49ers starting defensive linemen missed practice, and NT Glenn Dorsey is doubtful to play vs. the Titans on Sunday. Will the Niners be able to stop Titans' speedy Chris Johnson? http://www.nbcbayarea.com/news/sports/Beat-up-49ers-Defensive-Line-Will-be-Challenged-228345101.html