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Prevention or amelioration of morphologic lesions in LD100 E coli-shocked baboons with steroid/antibiotic therapy
Abstract:
We have documented the effectiveness of methylprednisolone sodium succinate (MPSS) and gentamicin sulfate (GS) therapy for LD100 E coli-induced shock in the baboon. We sequentially delayed initiation of MPSS infusion from 30 to 120 min and then to 240 min after onset of a 2-h E coli infusion. Treatment resulted in 100%, 85%, and 65% survival respectively. In this study we evaluated tissue taken at autopsy in the three MPSS/GS treatment studies including untreated baboons and those treated with GS only. When animals died (3-49 h) or were sacrificed (7-71 days), tissues were removed, coded, and prepared for histopathologic evaluation by light microscopy. On the basis of morphologic changes animals split into two groups: baboons with little or no tissue alterations (survivors), and those with multiple organ damage (nonsurvivors). Combinations of mild to massive congestion, edema, hemorrhage, fibrin thrombi, increased numbers of polymorphonuclear leukocytes (PMNs), and necrosis of the adrenal glands, liver, kidneys, lungs, and spleen of nonsurvivors were prevented or ameliorated in the MPSS/GS-treated surviving baboons. Data demonstrate the MPSS/GS therapy prevents or reverses the multiple organ damage and increases survival in lethal septic shock.
Insights
Methylprednisolone sodium succinate (MPSS) and gentamicin sulfate (GS) therapy significantly improved survival rates in baboons experiencing lethal E coli-induced septic shock. This combined treatment effectively prevented or reversed multiple organ damage, crucial for combating severe infections.
Area of Science:
- Veterinary Medicine
- Pharmacology
- Pathology
Background:
- Septic shock, induced by Escherichia coli (E. coli), poses a critical threat in both clinical and research settings.
- Understanding the efficacy of therapeutic interventions is vital for improving patient outcomes.
Purpose of the Study:
- To evaluate the effectiveness of methylprednisolone sodium succinate (MPSS) and gentamicin sulfate (GS) combination therapy in a baboon model of lethal E. coli-induced septic shock.
- To histopathologically assess the impact of MPSS/GS therapy on organ damage in baboons with septic shock.
Main Methods:
- Baboons were subjected to a lethal dose (LD100) of E. coli infusion.
- MPSS/GS treatment was initiated at varying time points (30, 120, 240 minutes) post-infusion.
- Tissues from deceased or sacrificed animals were examined via light microscopy for histopathologic changes.
Main Results:
- Survival rates were 100%, 85%, and 65% when MPSS/GS treatment was initiated at 30, 120, and 240 minutes, respectively.
- Nonsurvivors exhibited significant organ damage, including adrenal gland, liver, kidney, lung, and spleen necrosis.
- MPSS/GS-treated survivors showed prevention or amelioration of these pathological changes.
Conclusions:
- MPSS/GS combination therapy is highly effective in increasing survival rates in E. coli-induced septic shock in baboons.
- The therapy mitigates severe multi-organ damage associated with lethal septic shock.
- This therapeutic approach holds promise for managing critical cases of septic shock.