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A p38alpha selective mitogen-activated protein kinase inhibitor prevents periodontal bone loss.
J Pharmacol Exp Ther 2007; 320(1):56-63JP

Abstract

In the oral microbial environment, Gram-negative bacterial derived lipopolysaccharide (LPS) can initiate inflammatory bone loss as seen in periodontal diseases. p38 Mitogen-activated protein kinase (MAPK) signaling is critical to inflammatory cytokine and LPS-induced cytokine expression, which may contribute toward periodontal bone loss. The purpose of this proof-of-principle study was to evaluate the ability of an orally active p38alpha MAPK inhibitor (SD-282) to reduce periopathogenic LPS-induced alveolar bone loss in an experimental rat model. Five groups of Sprague-Dawley rats received one of the following treatments: LPS injected to the palatal gingiva adjacent to the maxillary molars three times per week for 8 weeks, LPS plus two doses of SD-282 (15 or 45 mg/kg) twice daily by oral gavage, or control groups given drug vehicle (1% polyethylene glycol) or SD-282 (45 mg/kg) only. Baseline and 8-week alveolar bone loss was assessed by microcomputed tomography (microCT) and histological examination. LPS induced severe bone loss over this time period, whereas control groups were unchanged from baseline measurements. Both doses of SD-282 showed significant protection from LPS-induced bone loss. Bone area and volumetric analysis of maxillas by microCT indicated significant loss of bone volume with LPS treatment, which was blocked with the p38 inhibitor. Histological examination indicated significantly fewer tartate-resistant acid phosphatase-positive osteoclasts and a significant decrease in interleukin (IL)-6, IL-1beta, and tumor necrosis factor alpha expression in p38 inhibitor-treated groups compared with LPS groups by immunostaining. Results from this in vivo study suggest that orally active p38 MAPK inhibitors can reduce LPS-induced inflammatory cytokine production and osteoclast formation and protect against LPS-stimulated alveolar bone loss.

Authors+Show Affiliations

Department of Periodontics and Oral Medicine, University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109-1078, USA. klkirk@umich.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo 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

17041006

Citation

Kirkwood, Keith L., et al. "A P38alpha Selective Mitogen-activated Protein Kinase Inhibitor Prevents Periodontal Bone Loss." The Journal of Pharmacology and Experimental Therapeutics, vol. 320, no. 1, 2007, pp. 56-63.
Kirkwood KL, Li F, Rogers JE, et al. A p38alpha selective mitogen-activated protein kinase inhibitor prevents periodontal bone loss. J Pharmacol Exp Ther. 2007;320(1):56-63.
Kirkwood, K. L., Li, F., Rogers, J. E., Otremba, J., Coatney, D. D., Kreider, J. M., ... Medicherla, S. (2007). A p38alpha selective mitogen-activated protein kinase inhibitor prevents periodontal bone loss. The Journal of Pharmacology and Experimental Therapeutics, 320(1), pp. 56-63.
Kirkwood KL, et al. A P38alpha Selective Mitogen-activated Protein Kinase Inhibitor Prevents Periodontal Bone Loss. J Pharmacol Exp Ther. 2007;320(1):56-63. PubMed PMID: 17041006.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A p38alpha selective mitogen-activated protein kinase inhibitor prevents periodontal bone loss. AU - Kirkwood,Keith L, AU - Li,Fei, AU - Rogers,Jill E, AU - Otremba,Jodie, AU - Coatney,Derek D, AU - Kreider,Jaclynn M, AU - D'Silva,Nisha J, AU - Chakravarty,Sarvajit, AU - Dugar,Sundeep, AU - Higgins,Linda S, AU - Protter,Andrew A, AU - Medicherla,Satyanarayana, Y1 - 2006/10/13/ PY - 2006/10/17/pubmed PY - 2007/2/13/medline PY - 2006/10/17/entrez SP - 56 EP - 63 JF - The Journal of pharmacology and experimental therapeutics JO - J. Pharmacol. Exp. Ther. VL - 320 IS - 1 N2 - In the oral microbial environment, Gram-negative bacterial derived lipopolysaccharide (LPS) can initiate inflammatory bone loss as seen in periodontal diseases. p38 Mitogen-activated protein kinase (MAPK) signaling is critical to inflammatory cytokine and LPS-induced cytokine expression, which may contribute toward periodontal bone loss. The purpose of this proof-of-principle study was to evaluate the ability of an orally active p38alpha MAPK inhibitor (SD-282) to reduce periopathogenic LPS-induced alveolar bone loss in an experimental rat model. Five groups of Sprague-Dawley rats received one of the following treatments: LPS injected to the palatal gingiva adjacent to the maxillary molars three times per week for 8 weeks, LPS plus two doses of SD-282 (15 or 45 mg/kg) twice daily by oral gavage, or control groups given drug vehicle (1% polyethylene glycol) or SD-282 (45 mg/kg) only. Baseline and 8-week alveolar bone loss was assessed by microcomputed tomography (microCT) and histological examination. LPS induced severe bone loss over this time period, whereas control groups were unchanged from baseline measurements. Both doses of SD-282 showed significant protection from LPS-induced bone loss. Bone area and volumetric analysis of maxillas by microCT indicated significant loss of bone volume with LPS treatment, which was blocked with the p38 inhibitor. Histological examination indicated significantly fewer tartate-resistant acid phosphatase-positive osteoclasts and a significant decrease in interleukin (IL)-6, IL-1beta, and tumor necrosis factor alpha expression in p38 inhibitor-treated groups compared with LPS groups by immunostaining. Results from this in vivo study suggest that orally active p38 MAPK inhibitors can reduce LPS-induced inflammatory cytokine production and osteoclast formation and protect against LPS-stimulated alveolar bone loss. SN - 0022-3565 UR - https://www.unboundmedicine.com/medline/citation/17041006/A_p38alpha_selective_mitogen_activated_protein_kinase_inhibitor_prevents_periodontal_bone_loss_ L2 - http://jpet.aspetjournals.org/cgi/pmidlookup?view=long&pmid=17041006 DB - PRIME DP - Unbound Medicine ER -