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Post-stroke infections exacerbate ischemic brain injury in middle-aged rats: immunomodulation and neuroprotection by progesterone.
Neuroscience. 2013 Jun 03; 239:92-102.N

Abstract

We investigated the effect of delayed, prolonged systemic inflammation on stroke outcomes and progesterone (P4) neuroprotection in middle-aged rats. After transient middle cerebral artery occlusion/reperfusion (MCAO) surgery, rats received P4 (8 or 16 mg/kg) or vehicle injections at 2h, 6h and every 24h until day 7 post-occlusion. At 24h post-injury systemic inflammation was induced by giving three doses of lipopolysaccharide (LPS; 50 μg/kg, at 4h intervals) to model post-stroke infections. We measured serum brain-derived neurotrophic factor (BDNF), pro-inflammatory cytokines, and behavioral parameters at multiple times. Serum BDNF levels decreased more in the vehicle+LPS group compared to vehicle-alone at 3 and 7 days post-injury (P<0.05). Vehicle-alone showed a significant increase in interleukin-1β, interleukin-6, and tumor necrosis factor alpha levels at different times following stroke and these levels were further elevated in the vehicle+LPS group. P4 at both doses produced a significant (P<0.05) decline in cytokine levels compared to vehicle and vehicle+LPS. P4 restored BDNF levels at 3 and 7 days post-stroke (P<0.05). Behavioral assessment (rotarod, grip strength, sensory neglect and locomotor activity tests) at 3, 5 and 7 days post-stroke revealed that the vehicle group had significant (P<0.05) deficits in all tests compared to intact controls, and performance was worse in the vehicle+LPS group. P4 at both doses produced significant functional improvement on all tests. Systemic inflammation did not show an additive effect on infarct volume but P4 at both doses showed significant infarct reduction. We suggest that post-stroke infection exacerbates stroke outcomes and P4 exerts neuroprotective/modulatory effects through its systemic anti-inflammatory and BDNF regulatory actions.

Authors+Show Affiliations

Department of Emergency Medicine, Brain Research Laboratory, Emory University, Atlanta, GA 30322, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural

Language

eng

PubMed ID

23079632

Citation

Yousuf, S, et al. "Post-stroke Infections Exacerbate Ischemic Brain Injury in Middle-aged Rats: Immunomodulation and Neuroprotection By Progesterone." Neuroscience, vol. 239, 2013, pp. 92-102.
Yousuf S, Atif F, Sayeed I, et al. Post-stroke infections exacerbate ischemic brain injury in middle-aged rats: immunomodulation and neuroprotection by progesterone. Neuroscience. 2013;239:92-102.
Yousuf, S., Atif, F., Sayeed, I., Wang, J., & Stein, D. G. (2013). Post-stroke infections exacerbate ischemic brain injury in middle-aged rats: immunomodulation and neuroprotection by progesterone. Neuroscience, 239, 92-102. https://doi.org/10.1016/j.neuroscience.2012.10.017
Yousuf S, et al. Post-stroke Infections Exacerbate Ischemic Brain Injury in Middle-aged Rats: Immunomodulation and Neuroprotection By Progesterone. Neuroscience. 2013 Jun 3;239:92-102. PubMed PMID: 23079632.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Post-stroke infections exacerbate ischemic brain injury in middle-aged rats: immunomodulation and neuroprotection by progesterone. AU - Yousuf,S, AU - Atif,F, AU - Sayeed,I, AU - Wang,J, AU - Stein,D G, Y1 - 2012/10/16/ PY - 2012/08/03/received PY - 2012/09/26/revised PY - 2012/10/05/accepted PY - 2012/10/20/entrez PY - 2012/10/20/pubmed PY - 2013/10/18/medline SP - 92 EP - 102 JF - Neuroscience JO - Neuroscience VL - 239 N2 - We investigated the effect of delayed, prolonged systemic inflammation on stroke outcomes and progesterone (P4) neuroprotection in middle-aged rats. After transient middle cerebral artery occlusion/reperfusion (MCAO) surgery, rats received P4 (8 or 16 mg/kg) or vehicle injections at 2h, 6h and every 24h until day 7 post-occlusion. At 24h post-injury systemic inflammation was induced by giving three doses of lipopolysaccharide (LPS; 50 μg/kg, at 4h intervals) to model post-stroke infections. We measured serum brain-derived neurotrophic factor (BDNF), pro-inflammatory cytokines, and behavioral parameters at multiple times. Serum BDNF levels decreased more in the vehicle+LPS group compared to vehicle-alone at 3 and 7 days post-injury (P<0.05). Vehicle-alone showed a significant increase in interleukin-1β, interleukin-6, and tumor necrosis factor alpha levels at different times following stroke and these levels were further elevated in the vehicle+LPS group. P4 at both doses produced a significant (P<0.05) decline in cytokine levels compared to vehicle and vehicle+LPS. P4 restored BDNF levels at 3 and 7 days post-stroke (P<0.05). Behavioral assessment (rotarod, grip strength, sensory neglect and locomotor activity tests) at 3, 5 and 7 days post-stroke revealed that the vehicle group had significant (P<0.05) deficits in all tests compared to intact controls, and performance was worse in the vehicle+LPS group. P4 at both doses produced significant functional improvement on all tests. Systemic inflammation did not show an additive effect on infarct volume but P4 at both doses showed significant infarct reduction. We suggest that post-stroke infection exacerbates stroke outcomes and P4 exerts neuroprotective/modulatory effects through its systemic anti-inflammatory and BDNF regulatory actions. SN - 1873-7544 UR - https://www.unboundmedicine.com/medline/citation/23079632/Post_stroke_infections_exacerbate_ischemic_brain_injury_in_middle_aged_rats:_immunomodulation_and_neuroprotection_by_progesterone_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0306-4522(12)01025-1 DB - PRIME DP - Unbound Medicine ER -