Progressive dopamine neuron loss following supra-nigral lipopolysaccharide (LPS) infusion into rats exposed to LPS prenatally
| Autor: | Joshua A. Snyder, Zaodung Ling, Paul M. Carvey, Yuangui Zhu, Jack W. Lipton, Chong Wai Tong |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Lipopolysaccharides
Male medicine.medical_specialty Tyrosine 3-Monooxygenase Lipopolysaccharide Dopamine Inflammation chemistry.chemical_compound Developmental Neuroscience Antigens CD Pregnancy Internal medicine medicine Animals Neurotransmitter Infusion Pumps Neuroinflammation Neurons Analysis of Variance Cell Death Microglia business.industry Interleukin Glutathione Rats Substantia Nigra Endocrinology medicine.anatomical_structure Neurology chemistry Prenatal Exposure Delayed Effects Disease Progression Cytokines Neuroglia Female Tumor necrosis factor alpha medicine.symptom business |
| Zdroj: | Experimental Neurology. 199:499-512 |
| ISSN: | 0014-4886 |
| DOI: | 10.1016/j.expneurol.2006.01.010 |
| Popis: | Toxin-induced animal models of Parkinson's disease (PD) exhibit many of the same neuroinflammatory changes seen in patients suggesting a role for inflammation in DA neuron loss. Yet, despite this inflammation, the progressive loss of DA neurons that characterizes PD is rarely seen in animals. We infused lipopolysaccharide (LPS) or saline into 7-month-old rats that had been exposed to LPS or saline prenatally and assessed them for DA neuron loss and inflammatory measures (interleukin 1 beta, tumor necrosis factor-alpha, glutathione, and activated microglia) over a period of 84 days to examine the role of pre-existing inflammation in progressive DA neuron loss. LPS infusion into both prenatal treatment groups produced neuroinflammation during the 14 days of LPS infusion that subsequently reverted toward normal over the next 70 days. In animals with pre-existing inflammation (i.e., prenatal LPS), however, the acute changes seen were attenuated, but took much longer to return to normal suggesting a prolonged inflammatory response. These inflammatory changes were consistent with the greater acute DA neuron loss seen in the prenatal saline controls and the progressive DA neuron loss seen only in the animals exposed to LPS prenatally. Interestingly, both prenatal treatment groups exhibited increases in microglia over the entire 84-day course of the study. These data suggest that pre-existing neuroinflammation prolongs the inflammatory response that occurs with a second toxic exposure, which may be responsible for progressive DA neuron loss. This provides further support for the "multiple hit" hypothesis of PD. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect