PMID- 36287128 OWN - NLM STAT- MEDLINE DCOM- 20230202 LR - 20230223 IS - 1469-7793 (Electronic) IS - 0022-3751 (Linking) VI - 601 IP - 3 DP - 2023 Feb TI - Rat resistance to rheumatoid arthritis induction as a function of the early-phase adrenal-pineal crosstalk. PG - 535-549 LID - 10.1113/JP283456 [doi] AB - Chronic inflammatory diseases are triggered by causal stimuli that might occur long before the appearance of the symptoms. Increasing evidence suggests that these stimuli are necessary but not always sufficient to induce the diseases. The murine model of type II collagen emulsified in Freund's incomplete adjuvant (collagen-induced arthritis) to induce rheumatoid arthritis (RA) follows this pattern as some animals do not develop the chronically inflamed phenotype. Considering that in the immune-pineal axis (IPA) theory adrenal-pineal cross-talk adjusts early phases of inflammatory processes, we investigated whether differences in IPA activation could explain why some animals are resistant (RES) while others develop RA. We observed a similar increase in 6-sulfatoxymelatonin (aMT6s) excretion from day 3 to 13 in both RES and RA animals, followed by a significant decrease in RA animals. This pattern of aMT6s excretion positively correlated with plasma corticosterone (CORT) in RES animals. Additionally, RA animals presented a lower aMT6s/CORT ratio than saline-injected or RES animals. Plasmatic levels of tumour necrosis factor were similar in both groups, but interleukin (IL)-1beta and monocyte chemotactic protein 1 (MCP-1) levels were lower in RES compared to RA animals. IL-2 and IL-4 were decreased in RES animals compared to saline-injected animals. The aMT6s/CORT ratio inversely correlated with the paw thickness and the inflammatory score (levels of IL-1beta, MCP-1, IL-2 and IL-4 combined). Thus, adrenocortical-pineal positive interaction is an early defence mechanism for avoiding inflammatory chronification. KEY POINTS: Immune-pineal axis imbalance is observed in early-phase rheumatoid arthritis development. Only resistant animals present a positive association between adrenal and pineal hormones. The 6-sulfatoxymelatonin/corticosterone ratio is decreased in animals that develop rheumatoid arthritis. The inflammatory score combining the levels of nocturnal interleukin (IL)-1beta, monocyte chemotactic protein 1, IL-2 and IL-4 presents a very strong positive correlation with the size of inflammatory lesion. The 6-sulfatoxymelatonin/corticosterone ratio presents a strong negative correlation with the inflammatory score and paw oedema size. CI - (c) 2022 The Authors. The Journal of Physiology (c) 2022 The Physiological Society. FAU - Cordoba-Moreno, Marlina O AU - Cordoba-Moreno MO AUID- ORCID: 0000-0001-8055-0085 AD - Department of Physiology, University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil. FAU - Mendes, Mariana Trivilin AU - Mendes MT AD - Department of Physiology, University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil. FAU - Markus, Regina P AU - Markus RP AUID- ORCID: 0000-0003-4606-6120 AD - Department of Physiology, University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil. FAU - Fernandes, Pedro Augusto AU - Fernandes PA AUID- ORCID: 0000-0002-4871-8201 AD - Department of Physiology, University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20221208 PL - England TA - J Physiol JT - The Journal of physiology JID - 0266262 RN - 0 (Chemokine CCL2) RN - W980KJ009P (Corticosterone) RN - 207137-56-2 (Interleukin-4) RN - 0 (Interleukin-2) RN - 0 (Cytokines) SB - IM CIN - J Physiol. 2023 Feb;601(3):403-405. PMID: 36550630 MH - Rats MH - Mice MH - Animals MH - Chemokine CCL2 MH - Corticosterone MH - Interleukin-4/adverse effects MH - Interleukin-2 MH - *Arthritis, Rheumatoid/metabolism/pathology MH - *Arthritis, Experimental/chemically induced/pathology MH - Cytokines/metabolism OTO - NOTNLM OT - chronic inflammation OT - collagen-induced arthritis OT - cytokines OT - glucocorticoids OT - immune-pineal axis OT - melatonin OT - rheumatoid arthritis EDAT- 2022/10/27 06:00 MHDA- 2023/02/03 06:00 CRDT- 2022/10/26 10:33 PHST- 2022/06/10 00:00 [received] PHST- 2022/10/07 00:00 [accepted] PHST- 2022/10/27 06:00 [pubmed] PHST- 2023/02/03 06:00 [medline] PHST- 2022/10/26 10:33 [entrez] AID - 10.1113/JP283456 [doi] PST - ppublish SO - J Physiol. 2023 Feb;601(3):535-549. doi: 10.1113/JP283456. Epub 2022 Dec 8.