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392826 occurrences (No.45 in the rank) during 5 years in the PubMed. [cache]
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392826 occurrences (No.45 in the rank) during 5 years in the PubMed. [cache]
| 251) Under acute inflammatory conditions, an abnormal pattern of recruitment was observed for leukocytes in homozygous (α-/-) mice in comparison to both control groups. |
| PMID:23271199 DOI:10.3233/CH-121660 |
| 2015 Clinical hemorheology and microcirculation |
| * Fibrinogen modulates leukocyte recruitment in vivo during the acute inflammatory response. |
| - Besides playing an important role in blood hemostases, fibrinogen also regulates leukocyte function in inflammation. Our previous in vitro studies showed that the adhesive behaviour of the neutrophil is modulated by soluble fibrinogen when present at a physiological concentration. This led us to propose that this plasma glycoprotein might further influence leukocyte recruitment in vivo and thus contribute to the inflammatory response. To address this in vivo, leukocyte recruitment was here investigated under acute inflammatory conditions in the absence of soluble fibrinogen in the blood circulation. For such, intravital microscopy on mesentery post-capillary venules was performed on homozygous fibrinogen α chain-deficient mice ((α-/-) mice). Acute inflammatory states were induced by perfusing platelet activating factor (PAF) over the exposed tissue. As control animals, two groups of mice expressing soluble fibrinogen in circulation were used, namely, C57BL/6 wild type animals and heterozygous fibrinogen α chain-deficient mice ((α+/-) mice). Under acute inflammatory conditions, an abnormal pattern of recruitment was observed for leukocytes in homozygous (α-/-) mice in comparison to both control groups. In fact, the former exhibited a significantly decreased number of rolling leukocytes that nevertheless, migrated with increased rolling velocities when compared to leukocytes from control animals. Consistently, homozygous mice further displayed a diminished number of adherent leukocytes than the other groups. Altogether our observations led us to conclude that leukocyte recruitment in homozygous (α-/-) mice is compromised what strongly suggests a role for soluble fibrinogen in leukocyte recruitment in inflammation. |
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