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Modulation of tight junction proteins in the perineurium for regional pain control
Author(s) -
Hackel D.,
Brack A.,
Fromm M.,
Rittner H.L.
Publication year - 2012
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.2012.06499.x
Subject(s) - perineurium , tight junction , occludin , claudin , chemistry , blood–brain barrier , tonicity , microbiology and biotechnology , biophysics , neuroscience , medicine , peripheral nerve , anatomy , biology , biochemistry , central nervous system
Peripheral neurons are surrounded by the perineurium that forms the blood–nerve barrier and protects the nerve. Although the barrier serves as protection, it also hampers drug delivery of analgesic drugs to the peripheral nerve. We previously showed that opening of the barrier using hypertonic solutions facilitates drug delivery, for example, of hydrophilic opioids, which selectively target nociceptors. The perineurial barrier is formed by tight junction proteins, including claudin‐1, claudin‐5, and occludin. Under pathophysiological conditions such as nerve crush injury, the perineurial barrier is opened and tight junction proteins are no longer present. After several days, tight junction proteins reappear and the barrier reseals. Similarly, perineurial injection of hypertonic saline transiently opens the barrier, claudin‐1 disappears, and hydrophilic analgesic drugs are effective. In the future, these findings could be used to reseal the barrier breakdown and could be applied to other barriers like the blood–brain or the intestinal mucosal barrier.