Downregulation of cholesteryl ester transfer protein by glucocorticoids: a randomised study on HDL.

BACKGROUND: High density lipoprotein (HDL) cholesterol is not decreased in hypercortisolism despite high triglycerides, which may be ascribed to effects on the cholesteryl ester transfer protein (CETP) pathway. We explored if CETP mRNA expression is modulated by glucocorticoid treatment in vitro. Effects of doubling the hydrocortisone (HCT) replacement dose on plasma CETP activity, and HDL characteristics were tested in patients with secondary adrenal insufficiency. MATERIALS AND METHODS: Human THP-1 macrophages were incubated with corticosterone in vitro in the presence or absence of a liver X receptor (LXR) agonist, followed by determination of CETP mRNA levels by quantitative real-time PCR. In addition, a randomised double-blind cross-over study was performed in 47 patients with secondary adrenal insufficiency (university medical setting; 10 weeks exposure to a higher HCT dose (0·4-0·6 mg/kg body weight) vs. 10 weeks of a lower HCT dose (0·2-0·3 mg/kg body weight). RESULTS: Corticosterone dose dependently decreased CETP mRNA in THP-1 macrophages. Corticosterone also decreased CETP mRNA expression after LXR pretreatment. In patients, CETP activity decreased with doubling of the HCT dose (P = 0·049), coinciding with an increase in HDL cholesterol, apolipoprotein A-I and the HDL cholesterol/apolipoprotein A-I ratio (reflecting HDL size; P < 0·01 for each). The increase in the HDL cholesterol/apolipoprotein A-I ratio was correlated with the decrease in plasma CETP activity (r = -0·442, P = 0·002). CONCLUSION: Glucocorticoids downregulate CETP gene expression in a human macrophage cell system. In line, a higher glucocorticoid replacement dose decreases plasma CETP activity in patients, thereby contributing to higher HDL cholesterol and an increase in estimated HDL size.

Higher hydrocortisone dose increases bilirubin in hypopituitary patients- results from an RCT.

BACKGROUND: Bilirubin has anti-oxidative and anti-inflammatory properties, which may explain its proposed protective effects on the development of cardiometabolic disorders. Glucocorticoids affect heme oxygenase regulation in vitro, which plays a key role in bilirubin production. Effects of variations in glucocorticoid exposure on circulating bilirubin levels in humans are unknown. Here we tested whether a higher hydrocortisone replacement dose affects circulating bilirubin in hypopituitary patients. MATERIALS AND METHODS: A randomized double-blind cross-over study (ClinicalTrials.gov, number NCT01546992) was performed in 47 patients with secondary adrenal failure [10-week exposure to a higher hydrocortisone dose (0·4-0·6 mg/kg body weight) vs. 10 weeks of a lower hydrocortisone dose (0·2-0·3 mg/kg body weight)]. RESULTS: Plasma total bilirubin was increased by 10% from 7 to 8 µM in response to the higher hydrocortisone dose (P = 0·033). This effect was inversely related to age (P = 0·042), but was unaffected by sex, obesity and (replacement for) other hormonal insufficiencies. The higher hydrocortisone dose also resulted in lower alkaline phosphatase (P = 0·006) and aspartate aminotransferase activities (P = 0·001). CONCLUSION: Bilirubin is modestly increased in response to higher glucocorticoid exposure in humans, in conjunction with lower alkaline phosphatase and aspartate aminotransferase activities, which are supposed to represent biomarkers of a pro-inflammatory state and enhanced liver fat accumulation.

Hydrocortisone Dose Influences Pain, Depressive Symptoms and Perceived Health in Adrenal Insufficiency: A Randomized Controlled Trial.

BACKGROUND: There is a major lack of randomized controlled trials (RCTs) evaluating the effects of hydrocortisone (HC) substitution therapy in patients with secondary adrenal insufficiency. Therefore, we evaluated the effects of two different replacement doses of HC on health-related quality of life (HRQoL) in a RCT. METHODS: This RCT with a double-blind cross-over design was performed at the University Medical Center Groningen. Forty-seven patients (29 men, age 51 ± 14 years, range 19-73 years) with secondary adrenal insufficiency participated. Patients received both a lower and a higher dose of HC (0.2-0.3 and 0.4-0.6 mg/kg body weight/day) for 10 weeks in random order. HRQoL was assessed with a daily mood and symptom checklist (Patient Health Questionnaire-15 [PHQ-15], Generalized Anxiety Disorder-7 [GAD-7], Patient Health Questionnaire-9 [PHQ-9]) and with questionnaires assessing general well-being (RAND 36-Item Health Survey [RAND-36]), mood (Hospital Anxiety and Depression Scale [HADS]) and fatigue (Multidimensional Fatigue Inventory-20 [MFI-20]). ClinicalTrials.gov identifier: NCT01546922. RESULTS: Patients receiving the higher dose of HC reported significantly fewer symptoms of depression (p = 0.016 and p = 0.045 for HADS and PHQ-9, respectively), less general and mental fatigue (p = 0.004 and p = 0.003, respectively, both MFI-20), increased motivation (p = 0.021, MFI-20), better physical functioning (p = 0.041), better general health (p = 0.013) and more vitality (p = 0.025) (all RAND-36). In addition, while on the higher dose, fewer somatic symptoms (p = 0.022) and less pain (p < 0.001) (both PHQ-15) were experienced. CONCLUSIONS: On the higher dose of HC, patients reported a better HRQoL on various domains as compared to the lower dose of HC. The fact that a higher dose of HC may improve patient well-being should be taken into consideration when individualizing the HC substitution dose.

Hydrocortisone Affects Fatigue and Physical Functioning Through Metabolism of Tryptophan: A Randomized Controlled Trial.

Context: Hydrocortisone (HC) treatment influences health-related quality of life (HRQOL) in secondary adrenal insufficiency (AI). Glucocorticoids regulate tryptophan metabolism through the kynurenine pathway, which modulates mood and energy homeostasis. Objective: This study investigated whether tryptophan metabolism mediated the effect of HC dose on HRQOL in patients with secondary AI. Design, Setting, and Patients: Forty-seven patients with secondary AI participated in this double-blind randomized controlled cross-over trial in the University Medical Center Groningen. Intervention: Patients were treated for two 10-week periods with a daily HC dose of 0.2 to 0.3 mg/kg and 0.4 to 0.6 mg/kg body weight, respectively. Main Outcome Measures: Diary data and questionnaires were used to assess HRQOL. Tryptophan, kynurenine and 3-hydroxykynurenine were measured in serum and dialyzed plasma and the kynurenine-to-tryptophan ratio (Kyn/Trp ratio) ratio was calculated. Results: A higher dose HC was associated with increased levels of tryptophan (95% CI for mean difference 0.37 to 12.5, P = 0.038), reduced levels of kynurenine (95% CI, -0.49 to -0.10, P = 0.004) and 3-hydroxykynurenine (95% CI, -10.6 to -2.35, P = 0.003), and a reduced Kyn/Trp ratio (95% CI, -0.84 to -0.50, P < 0.001). The Kyn/Trp ratio mediated the effect of a higher dose HC on fatigue (P = 0.041) and physical functioning (P = 0.005). Conclusion: Metabolism of tryptophan through the kynurenine pathway is reduced after a 10-week treatment with a higher dose HC and plays a role in the effect of HC on fatigue and physical functioning in patients with secondary AI.

Pharmacokinetics of oral hydrocortisone - Results and implications from a randomized controlled trial.

CONTEXT AND OBJECTIVE: This study aimed at comparing pharmacokinetics of two different doses of hydrocortisone (HC) in patients with secondary adrenal insufficiency (SAI). DESIGN, SETTING AND PATIENTS: Forty-six patients with SAI participated in this randomized double-blind crossover study. INTERVENTION: Patients received two different doses of HC (0.2-0.3mg HC/kg body weight/day and 0.4-0.6mg HC/kg body weight/day). MAIN OUTCOME MEASURES: One- and two-compartment population models for plasma free cortisol, plasma total cortisol and salivary cortisol were parameterized. The individual pharmacokinetic parameters clearance (CL), volume of distribution (Vd), elimination half-life (t1/2), maximum concentration (Cmax), and area under the curve (AUC) were calculated. RESULTS: The one-compartment models gave a better description of the data compared to the two-compartment models. Weight-adjusted dosing reduced variability in cortisol exposure with comparable AUCs between weight groups. However, there was large inter-individual variation in CL and Vd of plasma free cortisol, plasma total cortisol and salivary cortisol. As a consequence, AUC24h varied more than 10 fold. Cortisol exposure was increased with the higher dose, but this was dose proportional only for free cortisol concentrations and not for total cortisol. CONCLUSIONS: Cortisol concentrations after a doubling of the dose were only dose proportional for free cortisol. HC pharmacokinetics can differ up to 10-fold inter-individually and individual adjustment of treatment doses may be necessary. Doubling of the HC dose in fast metabolizers (patients that showed relative low AUC and thus high clearance compared to other patients), does not result in significantly enhanced exposure during large parts of the day and these patients may need other management strategies.

Somatosensory function in patients with secondary adrenal insufficiency treated with two different doses of hydrocortisone-Results from a randomized controlled trial.

BACKGROUND: Low cortisol levels are associated with several functional pain syndromes. In patients with secondary adrenal insufficiency (SAI), the lack in endogenous cortisol production is substituted by the administration of oral hydrocortisone (HC). Our previous study showed that a lower dose of HC led to an increase in reported subjective pain symptoms. Whether different doses of HC substitution alter somatosensory functioning in SAI patients has not been established yet. METHODS: In this randomized double blind cross-over trial, forty-six patients with SAI participated. Patients randomly received either first a lower dose (0.2-0.3 mg HC/kg body weight/day) for 10 weeks followed by a higher dose (0.4-0.6 mg HC/kg body weight/day) for another 10 weeks, or vice versa. After each treatment period, blood samples were drawn and somatosensory functioning was assessed by determining the mechanical detection threshold (MDT), mechanical pain threshold (MPT), mechanical pain sensitivity (MPS) and the pain pressure threshold (PPT), according to the Quantitative Sensory Testing (QST) battery by the German Network on Neuropathic Pain. RESULTS: The administration of the higher dose of HC resulted in significantly higher levels of cortisol (mean [SD] 748 [245] nmol/L) than the lower dose (537 [250] nmol/L, P<0.001). No differences were found in MDT, MPT, MPS and PPT z-scores between the two doses of HC. Furthermore, the number of patients showing sensory abnormalities did not differ between the two different doses. CONCLUSIONS: The results suggest that the dose of HC has no impact on somatosensory functioning in response to mechanical stimuli in patients with SAI, despite previously found altered subjective pain reports.

Effects of Hydrocortisone on the Regulation of Blood Pressure: Results From a Randomized Controlled Trial.

CONTEXT: Cardiovascular risk is increased in patients with secondary adrenal insufficiency, which may be ascribed to an unfavorable metabolic profile consequent to a relatively high hydrocortisone replacement dose. OBJECTIVE: We determined the effects of a higher versus a lower glucocorticoid replacement dose on blood pressure (BP), the renin-angiotensin-aldosterone system, 11ß-hydroxysteroid dehydrogenase enzyme activity and circulating (nor)metanephrines. DESIGN, SETTING, AND PATIENTS: Forty-seven patients with secondary adrenal insufficiency from the University Medical Center Groningen participated in this randomized double-blind crossover study. INTERVENTIONS: Patients randomly received 0.2-0.3 mg hydrocortisone/kg body weight followed by 0.4-0.6 mg hydrocortisone/kg body weight, or vice versa, each during 10 weeks. MAIN OUTCOME MEASURE(S): BP and regulating hormones were measured. RESULTS: The higher hydrocortisone dose resulted in an increase in systolic BP of 5 (12) mm Hg (P = .011), diastolic BP of 2 (9) mm Hg (P = .050), and a median [interquartile range] drop in plasma potassium of -0.1 [-0.3; 0.1] nmol/liter (P = .048). The higher hydrocortisone dose led to decreases in serum aldosterone of -28 [-101; 9] pmol/liter (P = .020) and plasma renin of -1.3 [-4.5; 1.2 ] pg/mL (P = .051), and increased the ratio of plasma and urinary cortisol to cortisone (including their metabolites) (P < .001 for all). Furthermore, on the higher dose, plasma and urinary normetanephrine decreased by -0.101 [-0.242; 0.029] nmol/liter (P < .001) and -1.48 [-4.06; 0.29] µmol/mol creatinine (P < .001) respectively. CONCLUSIONS: A higher dose of hydrocortisone increased systolic and diastolic BP and was accompanied by changes in the renin-angiotensin-aldosterone system, 11ß-hydroxysteroid dehydrogenase enzyme activity, and circulating normetanephrine. This demonstrates that hydrocortisone dose even within the physiological range affects several pathways involved in BP regulation.

The effects of two different doses of hydrocortisone on cognition in patients with secondary adrenal insufficiency--results from a randomized controlled trial.

CONTEXT: A wide variety in hydrocortisone (HC) substitution dose-regimens are considered physiological for patients with secondary adrenal insufficiency (SAI). However, it is likely that cognition is negatively influenced by higher cortisol exposure to the brain. OBJECTIVE: To examine the effects of a high physiological HC dose in comparison to a low physiological HC dose on cognition. DESIGN AND SETTING: This study was a randomized double blind cross-over study at the University Medical Center Groningen. This study is registered with ClinicalTrials.gov, number NCT01546922. PATIENTS: Forty-seven patients (29 males, 18 females; mean [SD] age, 51 [14] years, range 19-73) with SAI participated. INTERVENTION(S): Patients randomly received first a low dose of HC (0.2-0.3 mg/kg body weight/day) during 10 weeks followed by a high dose (0.4-0.6 mg/kg body weight/day) for another 10 weeks, or vice versa. HC substitution was given in three divided doses with the highest dose in the morning. MAIN OUTCOME MEASURE(S): Cognitive performance (memory, attention, executive functioning and social cognition) of patients was measured at baseline and after each treatment period using a battery of 12 standardized cognitive tests. RESULTS: The higher dose of HC resulted in significantly higher systemic cortisol exposure for example measured at 1h after first dose ingestion (mean [SD], low dose: 653 [281] nmol/L; high dose: 930 [148] nmol/L; P<0.001). No differences in cognitive performance were found between the two dose regimens. CONCLUSIONS: No negative influence on memory, attention, executive functioning and social cognition was observed after 10 weeks of treatment with a higher physiological dose of HC in patients with SAI when compared to a lower dose.

Cognition and brain abnormalities on MRI in pituitary patients.

PURPOSE: The extent to which cognitive dysfunction is related to specific brain abnormalities in patients treated for pituitary macroadenoma is unclear. Therefore, we compared brain abnormalities seen on Magnetic Resonance Imaging (MRI) in patients treated for nonfunctioning pituitary macroadenoma (NFA) with or without impairments in cognitive functioning. METHODS: In this cross-sectional design, a cohort of 43 NFA patients was studied at the University Medical Center Groningen. White matter lesions (WMLs), cerebral atrophy, (silent) brain infarcts and abnormalities of the temporal lobes and hippocampi were assessed on pre-treatment and post-treatment MRI scans. Post-treatment cognitive examinations were performed using a verbal memory and executive functioning test. We compared our patient cohort with large reference populations representative of the Dutch population. RESULTS: One or more impairments on both cognitive tests were frequently observed in treated NFA patients. No treatment effects were found with regard to the comparison between patients with and without impairments in executive functioning. Interestingly, in patients with one or more impairments on verbal memory function, treatment with radiotherapy had been given more frequently (74% in the impaired group versus 40% in the unimpaired group, P=0.025). Patients with or without any brain abnormality on MRI did not differ in verbal memory or executive functioning. CONCLUSIONS: Brain abnormalities on MRI are not observed more frequently in treated NFA patients with impairments compared to NFA patients without impairments in verbal memory or executive functioning. Conversely, the absence of brain abnormalities on MRI does not exclude impairments in cognition.