"non-static" error in use of ROS publisher class inside of QThread class

I'm using ROS platform and want to publish a variable from publisher class. When I use this variable inside of QThread it faces with below error:

error: invalid use of non-static data member ‘MainWindow::chatter_pub’ros::Publisher chatter_pub;

My code is like this:

mainWindow.h

class MainWindow : public QMainWindow {
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

    class Thread : public QThread {
    public:
        void run();
    };

private:
    Ui::MainWindow *ui;
    ros::NodeHandle nh_;
    ros::Publisher chatter_pub;
    Thread thread;
};

mainWindow.cpp

MainWindow::MainWindow(QWidget *parent) :
  QMainWindow(parent),
  ui(new Ui::MainWindow)
{
  ui->setupUi(this);
  chatter_pub = nh_.advertise<visualization_msgs::Marker>("chatter", 10);
}

void MainWindow::on_open_cam_indoor_clicked()
{
  thread.start();
}

void MainWindow::Thread::run()
{
  while (true)
  {
    ...

    chatter_pub.publish(myVariableWantToSend);

    ...
  }
}

The main question is how can I use publisher method inside of QThread without any errors and problems. Thanks a lot...!