reload /etc/security/limits.conf without reboot server??

[mcclnx mcc <mcclnx@xxxxxxxxxxxx>]

We have CENTOS 4.7 on DELL server.  We need change following 3 files:
   /etc/security/limits.conf   /etc/pam.d/sshd   /etc/pam.d/su
Does there has way reload it without reboot server?
Thanks.

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