gistfile1.php

<?php
/**
 * @file
 * This module controls the access to view profile nodes and its email address
 * field.
 */

function mh_profile_access_form_profile_node_form_alter(&$form, &$form_state, $form_id) {
  $form['field_profile_e_mail']['und'][0]['email']['#description'] = t('new desc.');
  $form['field_profile_e_mail']['und'][0]['email']['#disabled'] = TRUE;
}