A synthetic anti-inflammatory sterol improves insulin sensitivity in insulin-resistant obese impaired glucose tolerance subjects.

OBJECTIVE: To study the activity of HE3286 (17α-ethynylandrost-5-ene-3ß,7ß,17ß-triol), an anti-inflammatory sterol that is active in models of obesity-induced inflammation and insulin resistance in high body mass index (BMI) subjects with impaired glucose tolerance (IGT). DESIGN AND METHODS: HE3286 was explored in high BMI IGT subjects using hyperinsulinemic, euglycemic clamp studies. RESULTS: In insulin-resistant subjects, HE3286 significantly increased day 29 insulin-stimulated glucose disposal and HDL cholesterol, and decreased C-reactive protein (CRP) compared to placebo. For HE3286, change in M value showed a significant negative correlation with baseline M value. Subjects with baseline M value below the median (4.2 mg/kg/min) had significantly lower adiponectin and higher lipopolysaccharide-stimulated peripheral blood mononuclear cell cytokine secretion. After 28 days of HE3286 treatment, adiponectin levels were significantly increased in insulin-resistant (baseline M < 4.2), but not insulin-sensitive (baseline M > 4.2) subjects, compared to placebo. CONCLUSIONS: HE3286 significantly increased the frequency of subjects with increased insulin-stimulated glucose disposal and HDL, and decreased CRP compared to placebo, in insulin-resistant, but not insulin-sensitive subjects. Thus, HE3286 may preferentially benefit insulin-resistant, inflamed, high BMI IGT subjects.

An anti-inflammatory sterol decreases obesity-related inflammation-induced insulin resistance and metabolic dysregulation.

Obesity-related inflammation-induced insulin resistance and metabolic dysregulation were investigated in retrospective analysis of placebo hematologic and metabolic laboratory data from trials associated with increasing chronic low-grade inflammation and body mass index. Studies included healthy subjects and those with progressive stages of metabolic dysregulation, including type 2 diabetes mellitus with uncontrolled hemoglobin A1c. Intrasubject variances in erythroid and metabolic values increased with metabolic dysregulation. Random effects were demonstrated in treatment-naïve diabetes for erythroid, glucose, and HbA1c fluctuations. The anti-inflammatory insulin sensitizer, HE3286, was tested for its ability to decrease obesity-related inflammation-induced insulin resistance and metabolic dysregulation in diabetes. HE3286 significantly decreased erythroid and metabolic variances and improved 1,5-anhydroglucitol (a surrogate of postprandial glucose) compared to the placebo group. HE3286 HbA1c decrease correlated with weight loss and inversely with baseline monocyte chemoattractant protein-1 (MCP-1) in metformin-treated diabetics. Normalization of HbA1c to the 84-day average hemoglobin revealed that HE3286 HbA1c decrease correlated with high baseline MCP-1 and MCP-1 decrease in treatment-naïve diabetics. HE3286 decreased insulin resistance, increased the frequency of decreased day 84 HbA1c in metformin-treated subjects, and decreased day 112 HbA1c in treatment-naïve diabetics. HE3286 may be useful to restore metabolic homeostasis in type 2 diabetes.

5-Androstene-3ß,17ß-diol promotes recovery of immature hematopoietic cells following myelosuppressive radiation and synergizes with thrombopoietin.

PURPOSE: 5-Androstene-3ß,17ß-diol (5-AED) stimulates recovery of hematopoiesis after exposure to radiation. To elucidate its cellular targets, the effects of 5-AED alone and in combination with (pegylated) granulocyte colony-stimulating factor and thrombopoietin (TPO) on immature hematopoietic progenitor cells were evaluated following total body irradiation. METHODS AND MATERIALS: BALB/c mice were exposed to radiation delivered as a single or as a fractionated dose, and recovery of bone marrow progenitors and peripheral blood parameters was assessed. RESULTS: BALB/c mice treated with 5-AED displayed accelerated multilineage blood cell recovery and elevated bone marrow (BM) cellularity and numbers of progenitor cells. The spleen colony-forming unit (CFU-S) assay, representing the life-saving short-term repopulating cells in BM of irradiated donor mice revealed that combined treatment with 5-AED plus TPO resulted in a 20.1-fold increase in CFU-S relative to that of placebo controls, and a 3.7 and 3.1-fold increase in comparison to 5-AED and TPO, whereas no effect was seen of Peg-G-CSF with or without 5-AED. Contrary to TPO, 5-AED also stimulated reconstitution of the more immature marrow repopulating (MRA) cells. CONCLUSIONS: 5-AED potently counteracts the hematopoietic effects of radiation-induced myelosuppression and promotes multilineage reconstitution by stimulating immature bone marrow cells in a pattern distinct from, but synergistic with TPO.

Studies of the pharmacology of 17α-ethynyl-androst-5-ene-3ß,7ß,17ß-triol, a synthetic anti-inflammatory androstene.

17α-Ethynyl-androst-5ene-3ß, 7ß, 17ß-triol (HE3286) is an orally bioavailable analogue of androst-5-ene-3ß,7ß,17ß-triol, a non-glucocorticoid anti-inflammatory metabolite of the adrenal steroid, dehydroepiandrosterone. The pharmacology of HE3286 was characterized in preparation for clinical trials in type 2 diabetes mellitus and other diseases of inflammation. Interactions with nuclear hormone receptors and P450 enzymes were measured in vitro. Drug metabolism was studied preclinically in mice, rats, dogs, and monkeys. Neurological and cardiopulmonary safety and dose-ranging and chronic toxicity studies were conducted in rats and dogs in accordance with FDA guidelines. Pharmacokinetics and metabolites were measured in Phase I clinical trials. HE3286 was differentially metabolized between species. HE3286 and metabolites did not bind or transactivate steroid binding nuclear hormone receptors or inhibit P450 enzymes. There were no adverse effects in safety pharmacology and canine toxicology studies. Although HE3286 did not elicit systemic toxicity in rats, mild estrogenic effects were observed, but without apparent association to hormonal changes. Safety margins were greater than 20-fold in rats and dogs with respect to the most commonly used clinical dose of 10 mg/day. The terminal half-life in humans was 8 hours in males and 5.5 hours in females. HE3286 is the first derivative of the DHEA metabolome to undergo a comprehensive pharmacological and safety evaluation. The results of these investigations have shown that HE3286 has a low potential for toxicity and possesses pharmacological properties generally suitable for use in human medicine. The favorable profile of HE3286 warrants further exploration of this new class of anti-inflammatory agents.

Phase I and Phase II clinical trials of androst-5-ene-3ß,7ß,17ß-triol.

UNLABELLED: The immune regulating DHEA metabolite, androst-5-ene-3ß,7ß,17ß-triol (ßAET), was evaluated for safety, cholesterol lowering, and vaccine enhancement in phase I and phase II clinical trials. Safety and pharmacokinetics were evaluated in one study of normal subjects that received ßAET or placebo transmucosally (buccal tablets) for 4 days. In a second study ßAET was given by daily subcutaneous injection for 3 days. ßAET was subsequently evaluated in placebo-controlled trials for cholesterol lowering in hyperlipidemic subjects and for potentiation of hepatitis B surface antigen (HBsAg) vaccine in elderly subjects. Adverse events were primarily associated with injection site reactions. Pharmacokinetics indicated that ßAET was rapidly cleared after either route of administration in both normal and elderly subjects. Plasma ßAET concentrations typically declined below the limit of detection within a few hours of administration. ßAET pharmacokinetics was similar in males and females and in normal and elderly subjects. ßAET significantly lowered cholesterol in normal adult, but not in elderly or hyperlipidemic subjects. HBsAg titers were not increased in elderly ßAET treated subjects relative to placebo. CONCLUSIONS: Short-term administration of ßAET is safe in humans. ßAET has a cholesterol lowering effect in healthy humans, but not hyperlipidemics. Exogenous ßAET appeared to be rapidly metabolized, which may be consequential to the lack of pharmacological activity. A longer duration of ßAET treatment with higher doses or chemical derivatives that are resistant to metabolic inactivation are likely necessary to treat human disease. The utility of ßAET in humans may be limited to maintenance of homeostasis in healthy adults.

Preliminary clinical findings on NEUMUNE as a potential treatment for acute radiation syndrome.

5-androstenediol (5-AED) has been advanced as a possible countermeasure for treating the haematological component of acute radiation syndrome (ARS). It has been used in animal models to stimulate both innate and adaptive immunity and treat infection and radiation-induced immune suppression. We here report on the safety, tolerability and haematologic activity of 5-AED in four double-blinded, randomized, placebo-controlled studies on healthy adults including elderly subjects. A 5-AED injectable suspension formulation (NEUMUNE) or placebo was administered intramuscularly as either a single injection, or once daily for five consecutive days at doses of 50, 100, 200 or 400 mg. Subjects (n = 129) were randomized to receive NEUMUNE (n = 95) or the placebo (n = 34). NEUMUNE was generally well-tolerated; the most frequent adverse events were local injection site reactions (n = 104, 81%) that were transient, dose-volume dependent, mild to moderate in severity, and that resolved over the course of the study. Blood chemistries revealed a transient increase (up to 28%) in creatine phosphokinase and C-reactive protein levels consistent with intramuscular injection and injection site irritation. The blood concentration profile of 5-AED is consistent with a depot formulation that increases in disproportionate increments following each dose. NEUMUNE significantly increased circulating neutrophils (p < 0.001) and platelets (p < 0.001) in the peripheral blood of adult and elderly subjects. A dose-response relationship was identified. Findings suggest that parenteral administration of 5-AED in aqueous suspension may be a safe and effective means to stimulate innate immunity and alleviate neutropenia and thrombocytopenia associated with ARS.

Safety and activity of the immune modulator HE2000 on the incidence of tuberculosis and other opportunistic infections in AIDS patients.

Twenty-five AIDS patients were treated with HE2000, a synthetic adrenal hormone. The drug was well tolerated and safe and reduced both the incidence of tuberculosis coinfection by 42.2% (P < 0.05) and the cumulative incidence of opportunistic infections (P < 0.05). These results warrant further clinical investigation of HE2000.

Reduction of parasite levels in patients with uncomplicated malaria by treatment with HE2000.

16alpha-Bromoepiandrosterone (HE2000) is a synthetic androstane steroid that has immune effects in pre-clinical models of malaria, tuberculosis, and infection with human immunodeficiency virus. In pilot studies, 42 patients with confirmed uncomplicated Plasmodium falciparum malaria were treated with a seven-day course of HE2000 by either buccal administration or intramuscular injection. Of the 42 patients, 41 showed a 50% reduction in blood levels of parasites, the primary endpoint of the study. Of these, 32 (76%) cleared malaria parasites below detectable levels. All febrile patients became afebrile by the end of treatment. There was no reduction in gametocyte forms. Adverse events were transient and mild to moderate in intensity. The anti-malarial response was generally similar with either the intramuscular or buccal routes of administration. HE2000 shows a safety profile and pharmacologic activity worthy of further investigation to understand its role in the treatment of malaria, perhaps in combination with anti-malarial agents.

5-androstenediol improves survival in clinically unsupported rhesus monkeys with radiation-induced myelosuppression.

We previously reported that five daily intramuscular doses of 5-androstenediol (AED), a naturally occurring adrenal steroid hormone, stimulated multilineage recovery of bone marrow in rhesus monkeys with radiation-induced myelosuppression after 4.0 Gy total body irradiation (TBI). Here we report the effect of AED on the survival of eighty rhesus macaques that received a 6.0 Gy dose of TBI in four sequential pilot studies. The drug was administered intramuscularly, based on body weight, 2-4 h after irradiation and continued once daily for a total of five injections. No clinical support in the form of antibiotics or transfusions was given to the animals at any time during the study. Five of the 40 (12.5%) treated animals died, compared to 13 of 40 (32.5%) of the animals in the control group (p=0.032). The combination of accumulated days of thrombocytopenia (<20,000 platelets/microL) up to day 14 (before the first death) together with treatment, accurately predicts mortality (p<0.001). The compound significantly reduced the duration of thrombocytopenia and neutropenia (p<0.01). The accumulation of days of neutropenia (ANC<500 cells/microL) up to day 14 plays no major role in predicting death. AED shows significant activity in irradiated primates with acute hematopoietic radiation syndrome.

5-androstenediol stimulates multilineage hematopoiesis in rhesus monkeys with radiation-induced myelosuppression.

Total body ionizing irradiation (TBI) between 2-8 Gy causes the hematopoietic component of the acute radiation syndrome (ARS) in humans. Here we report on an exploratory study with 5-androstenediol (AED) in rhesus monkeys exposed to 4 Gy (60)Co gamma TBI. In this study, the effects of two formulations administered 3-4 h after irradiation were evaluated. After radiation, severe neutropenia (<500 neutrophils/microL), thrombocytopenia (<50,000 platelets/microL), and anemia (hemoglobin <8.0 g/dL) occurred in 6, 6, and 5 of the 6 control animals, respectively. In these 6 control animals, the median time to first day of each defined cytopenia was 8.5, 13, and 20 days and the median time to last occurrence was 22.5, 19.5 and 29.5 days, respectively. All treated groups had a decrease in the duration of severe neutropenia relative to vehicle control. All but one dosing regimen decreased the duration of thrombocytopenia and anemia. Five consecutive days of a 15 mg/kg intramuscular (IM) micro-particle preparation and a once weekly 15 mg/kg subcutaneous (SC) nanoparticle suspension generally provided the greatest radiation protection. AED, as a single agent, promotes multilineage hematopoietic recovery of the bone marrow. These data suggest that it may play an important therapeutic role in the management of acute radiation syndrome.