Pathobiochemical Mechanisms Relating Iron Homeostasis with Parameters of Inflammatory Activity and Autoimmune Disorders in Rheumatoid Arthritis.

AIM: To find the correlations between the parameters of iron homeostasis, inflammatory activity and autoimmune disorders in rheumatoid arthritis (RA). MATERIALS AND METHODS: The present study included 114 patients with RA and 42 healthy controls. We determined the parameters of iron homeostasis: serum iron, total iron binding capacity (TIBC), ferritin and soluble transferrin receptor (sTfR), the parameters of inflammatory activity: C-reactive protein (CRP), interleukin-6 (IL-6) and prohepcidin, and the parameters of autoimmune disorders: rheumatoid factor (RF), anti-cyclic citrullinated peptide (antiCCP) antibodies and DAS 28. RESULTS: The levels of sTfR, CRP, IL-6 and prohepcidin were significantly higher in RA patients than those in the controls and the level of serum iron was significantly lower in RA than that in the control group. Unlike the controls, in RA, there was a significant positive correlation of sTfR with the parameters of inflammatory activity (IL-6, prohepcidin, ESR) and with the parameters of autoimmune disorders (DAS 28, RF, antiCCP). A negative correlation of serum iron with sTfR was found only in RA patients. Prohepcidin positively correlated with the parameters of inflammation (CRP, ESR) and with the parameters for evaluation of autoimmune disorders (DAS 28 and RF) in the RA group. CONCLUSION: Our study shows that the simultaneous determination of the two parameters sTfR and prohepcidin is most informative for evaluation of the changes in iron homeostasis in RA. The increase of both parameters provides information for tissue iron deficiency (assessed by the level of sTfR), caused by the inflammation when prohepcidin is expressed.

Pathobiochemical Mechanisms Relating Iron Homeostasis to Parameters of Inflammatory Activity and Autoimmune Disorders in Rheumatoid Arthritis.

AIM: To find the correlations between the parameters of iron homeostasis, inflammatory activity and autoimmune disorders in rheumatoid arthritis (RA). MATERIALS AND METHODS: The present study included 114 patients with RA and 42 healthy controls. We determined the parameters of iron homeostasis: serum iron, total iron binding capacity (TIBC), ferritin and soluble transferrin receptor (sTfR), the parameters of inflammatory activity: C-reactive protein (CRP), interleukin-6 (IL-6) and prohepcidin, and the parameters of autoimmune disorders: rheumatoid factor (RF), anti-cyclic citrullinated peptide (antiCCP) antibodies, and DAS 28. RESULTS: The levels of sTfR, CRP, IL-6 and prohepcidin were significantly higher in RA patients than those in the controls and the level of serum iron was significantly lower in RA than that in the control group. Unlike the controls, in RA, there was a significant positive correlation of sTfR with the parameters of inflammatory activity (IL-6, prohepcidin, ESR) and with the parameters of autoimmune disorders (DAS 28, RF, antiCCP). A negative correlation of serum iron with sTfR was found only in RA patients. Prohepcidin positively correlated with the parameters of inflammation (CRP, ESR) and with the parameters for evaluation of autoimmune disorders (DAS 28 and RF) in the RA group. CONCLUSION: Our study shows that the simultaneous determination of the two parameters sTfR and prohepcidin is most informative in evaluating the changes in iron homeostasis in RA. The increase of both parameters provides information for tissue iron deficiency (assessed by the level of sTfR), caused by the inflammation when prohepcidin is expressed.

Adherence to bisphosphonate therapy in postmenopausal osteoporotic women.

INTRODUCTION: Osteoporosis is a metabolic bone disease caused by a decrease in the bone mineral density. It is a major public health threat as it weakens bones, especially those in the wrist, spine, or hip, and causes them to break easily. AIM: The study aimed to find how strictly postmenopausal women with osteoporosis adhere to a long-term therapy with bisphosphonates. PATIENTS AND METHODS: The study was conducted over a 24-month period. It included a total of 341 randomized patients with postmenopausal osteoporosis; the diagnosis was made on the basis of clinical and radiological evidence and a DXA T-score of the axial skeleton and the left hip less than -2.5 SD. Therapy included per os administration of alendonate 70 mg once a week or 50 mg of ibandronate once a month. RESULTS: The patient medication persistence at the end of month 12 was 86.80%, and at the end of month 24 month - 58.94%. The medication possession ratio (MPR) in the bisphosphonate therapy at 6, 12, 18, and 24 months varied from 0.93 to 1.00. This suggests that there was a very good patient medication adherence of the study subjects to the 24-month treatment with bisphosphonates. The patient medication persistence dropped significantly at the end of month 12. CONCLUSION: Compliance of patients with antiresorptive therapy depends on the specific socio-economic conditions and the attending physician's behaviour. Very rarely, treatment is discontinued because of adverse effects exerted by the drugs or because patients may not be convinced that they have osteoporosis.