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Sex diferences in serum and synovial fluid C-reactive protein concentration in healthy dogs

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Abstract

Differences between serum C-reactive protein (SCRP) and synovial fluid C-reactive protein (SFCRP) concentrations in healthy animals may be influenced by the sex of the individual and associated with various factors. The objective of this study was to evaluate the disparities in SCRP and SFCRP concentrations between females and males, as well as within each sex. Sixty healthy dogs (N = 60), comprising both sexes, were enrolled in the study. Peripheral blood and knee synovial fluid samples were collected for SCRP and SFCRP analysis, respectively. Serum C-reactive protein (SCRP) and SFCRP concentrations were measured, with mean of 9.61 ± 4.96 mg/L for SCRP and 1.28 ± 3.05 mg/L for SFCRP. Notably, SFCRP concentrations were consistently lower than SCRP concentrations in both sexes. Statistically significant differences were observed between sexes for both SCRP (P = 0.021) and SFCRP (P = 0.007). Further analysis within females revealed statistically significant differences between SCRP and SFCRP concentrations (P = 0.002), whereas in males, such differences were not significant (P = 0.175). Additionally, weak correlations were found between SCRP and SFCRP concentrations for both sexes (females r = 0.07; males r = 0.29). Joint capsule thickness was assessed using ultrasonography, revealing thicker joint capsules in males. A robust positive association was noted between joint capsule thickness and the SFCRP concentration in both sexes. These findings offer valuable insights into the dynamics of CRP in the context of joint health in male and female patients, elucidating the underlying pathological mechanisms of joint disease and inflammation. Overall, this underscores the importance of considering sex-specific factors in the assessment and management of joint health, as well as in the design and interpretation of studies involving SFCRP concentrations.

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Acknowledgements

The authors wish to thank the Centre for Interdisciplinary Research in Animal Health (CIISA), of Faculty of Veterinary Medicine of Lisbon, of University of Lisbon–FMV/Ulisboa, Portugal; the laboratory Tridelta Development Limited®, Ireland, for offering the ELISA for serum PhaseTM Range Canine C—Reactive Protein Assay; and Anjos of Assis Veterinary Medicine Centre (CMVAA), Barreiro- Portugal.

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Conceptualization, L.MC; P. A Methodology, L.MC; F.II; P. A.; J. A.; G. P. Formal analysis, L.MC; F.I Investigation, L.MC; P. A Writing—original draft preparation, L.MC, GP Writing—review and editing L.MC; F.IC; P. AC; J. AC; G. P. All authors have read and agreed to the published version of the manuscript.

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Correspondence to L. Miguel Carreira.

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Ethical approval

The study was approved by the Animal Ethics and Welfare Council (CEBEA) of FMV-ULisboa with the number code 003/2017, and the animals' participation in the study only started after the owners signed an informed consent form.

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An informed consent form was made to Tutors, and only after they signed, patients could be admitted to the study.

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The authors declare no competing interests.

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Carreira, L.M., Alves, J., Inacio, F. et al. Sex diferences in serum and synovial fluid C-reactive protein concentration in healthy dogs. Vet Res Commun (2024). https://doi.org/10.1007/s11259-024-10386-0

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