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Specific contribution of mannose-binding lectin murine isoforms to brain ischemia/reperfusion injury.

ABSTRACT: Mannose-binding lectin (MBL), an initiator of the lectin pathway (LP) of complement activation, is detrimental in ischemic stroke, as shown in clinical studies and rodent models. Whereas humans have one functional MBL protein, rodents have two isoforms, MBL-A and MBL-C, whose functions relative to that of human MBL are unknown. To permit the clinical translation of preclinical data, we aimed to define the specific contributions of MBL-A and MBL-C to brain ischemia. We subjected mice with double (MBL-/-) or single (MBL-A-/- or MBL-C-/-) MBL isoform depletion to transient middle cerebral artery occlusion (tMCAo). MBL-/- mice had fewer neurological deficits and smaller ischemic lesions than WT mice. MBL-A-/- mice had smaller lesions than WT mice and exhibited no significant behavioral defects, whereas MBL-C-/- mice did not differ from WT mice. The induction of Mbl1 and Mbl2 (the MBL-A and MBL-C genes) expression 48?h after tMCAo was similar across genotypes. The time course of Mbl1 and Mbl2 expression in WT ischemic mice showed that Mbl1 activation occurred earlier (24?h) than Mbl2 activation (48?h). The plasma levels of MBL-A and MBL-C in MBL-C-/- and MBL-A-/- mice, respectively, were similar to those in WT mice both at baseline and at 48?h after tMCAo. At 48?h, MBL-A-/- ischemic mice showed higher MBL-C levels in the brain than WT mice. WT and MBL-C-/- ischemic mice had higher LP activity in plasma and, accordingly, higher levels of C3 deposition in the brain than MBL-A-/- and MBL-/- mice. In conclusion, mice with depletion of both MBL isoforms exhibited strong protection from ischemia/reperfusion injury. MBL-A was the main contributor to injury, likely owing to its earlier activation after ischemia and more efficient activation of the complement system than MBL-C.

SUBMITTER: Neglia L

PROVIDER: S-EPMC7052250 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Specific contribution of mannose-binding lectin murine isoforms to brain ischemia/reperfusion injury.

Neglia Laura L Oggioni Marco M Mercurio Domenico D De Simoni Maria-Grazia MG Fumagalli Stefano S

Cellular & molecular immunology 20190409 3

Mannose-binding lectin (MBL), an initiator of the lectin pathway (LP) of complement activation, is detrimental in ischemic stroke, as shown in clinical studies and rodent models. Whereas humans have one functional MBL protein, rodents have two isoforms, MBL-A and MBL-C, whose functions relative to that of human MBL are unknown. To permit the clinical translation of preclinical data, we aimed to define the specific contributions of MBL-A and MBL-C to brain ischemia. We subjected mice with double ...[more]

PMID: 30967639

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Project description:ObjectivesCutaneous ischemia/reperfusion (CI/R) injury has shown to play a significant role in chronic wounds such as decubitus ulcers, diabetic foot ulcers, atherosclerotic lesions, and venous stasis wounds. CI/R also plays a role in free tissue transfer in reconstructive microsurgery and has been linked to clinical burn-depth progression after thermal injury. While the role of the complement system has been elucidated in multiple organ systems, evidence is lacking with respect to its role in the skin. Therefore, we evaluated the role of the complement system in CI/R injury.MethodsUsing a single pedicle skin flap mouse model of acute CI/R, we performed CI/R in wild-type (WT) mice and complement knock out (KO) mice, deficient in either C1q (C1q KO; classical pathway inhibition), mannose-binding lectin (MBL null; lectin pathway inhibition) or factor B (H2Bf KO; alternative pathway inhibition). Following 10 h ischemia and 7 days reperfusion, mice were sacrificed, flaps harvested and flap viability assessed via Image J software. The flap necrotic area was expressed as % total flap area. In another group, mice were sacrificed following CI/R with 10 h ischemia and 48 h reperfusion. Two cranial skin flap samples were taken for gene expression analysis of IL1b, IL6, TNFα, ICAM1, VCAM1, IL10, IL13 using real-time polymerase chain reaction (RT-PCR).ResultsFollowing CI/R, MBL null mice had a statistically significant smaller %necrotic flap area compared to WT mice (10.6 vs. 43.1%; p<0.05) suggesting protection from CI/R. A significantly reduced mean %necrotic flap area was not seen in either C1q KO or H2Bf KO mice relative to WT (22.9 and 31.3 vs. 43.1%; p=0.08 and p=0.244, respectively). There were no statistically significant differences between groups for markers of inflammation (TNFα, ICAM1, VCAM1, IL1b, IL6). In contrast, mRNA levels of IL10, a regulator of inflammation, were significantly increased in the MBL null group (p=0.047).ConclusionsWe demonstrated for the first time a significant role of MBL and the lectin complement pathway in ischemia/reperfusion injury of the skin and a potential role for IL10 in attenuating CI/R injury, as IL10 levels were significantly increased in the tissue from the CI/R-protected MBL null group.

Dataset Information

Specific contribution of mannose-binding lectin murine isoforms to brain ischemia/reperfusion injury.

Publications

Specific contribution of mannose-binding lectin murine isoforms to brain ischemia/reperfusion injury.

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