(Recasts with Berlusconi comments)
MILAN, June 24 Italy's Editoriale L'Espresso said it is considering suing Prime Minister Silvio Berlusconi for urging an advertising boycott of its La Repubblica daily, prompting the premier to call the publishing group "shameless".
L'Espresso ESPI.MI said in a statement Berlusconi had accused Italy's No. 2 selling daily, La Repubblica, of a "subversive attack against him" and called on business leaders to "boycott and stop advertising investments" at the paper.
L'Espresso said it had instructed lawyers to consider civil and criminal actions over the remarks.
The left-leaning La Repubblica has led the attack against Berlusconi in recent weeks over his private life.
This began over his friendship with an 18-year old aspiring model and intensified after an escort said she had been paid to attend his parties. She also said she had slept with the prime minister [ID:nLN461096].
Berlusconi has denied ever paying for sex and calls the accusations against him "garbage".
The 72-year-old prime minister, who owns a publishing and broadcast empire that includes advertising arm Publitalia, responded by saying that businesses that place advertisements in such media are "masochistic".
"They are shameless," Berlusconi said. "I can't but reiterate that whoever advertises with media that so intensely talk about (economic crisis) that they themselves contribute to the crisis is masochistic".
Berlusconi has often accused the leftist opposition and the media for hyping up the economic crisis as recession-hit Italy battles its worst post-war economic slump. He has also accused the media of a smear campaign over his private life.
Earlier this month, Berlusconi said he was the victim of an orchestrated campaign of "subversion" over his relationship with an 18-year-old model and his use of state planes. [ID:nLD560025]
L'Espresso shares closed up 8.25 percent at 1.1420 euros, outperforming the 1.8 percent rise in the DJSTOXX European index of media companies .SXMP, but little changed by the company's statement this afternoon. (Writing by Deepa Babington and Danilo Masoni; Editing by David Cowell)