How to disable cell on grid according to checkbox status extJs 6

I need to disable some cells according checkbox status is changed. I added a listener to a checkbox column:

listeners: {
    checkchange: function( me , rowIndex , checked , record , e , eOpts) {
        var row = me.getView().getRow(rowIndex);
        var columnIndex = Ext.getCmp('MyColumnIdToDisable').fullColumnIndex;
        Ext.get(row.childNodes[columnIndex]).setDisabled=!checked;
    }        
}

But I got this error:

Uncaught TypeError: Ext.get(...).setDisabled is not a function

You can use this.disabledCls I have already example which does probably the same as you need. It disables particular cell.

https://fiddle.sencha.com/#view/editor&fiddle/1lvm

onCheckcolumnCheckChange: function (checkcolumn, rowIndex, checked, record, eOpts) {
    // we need to get a grids view
    var view = Ext.first('#MySpecialGridId').getView();
    var cell = view.getCell(rowIndex,1);

    if (checked) {
        // add disabled cls -> disabled
        cell.addCls(this.disabledCls);
    }else{
        // remove the disabled cls -> enabled
        cell.removeCls(this.disabledCls)
    }
}