Testosterone and Physical Function in HIV+ Men
Testosterone and Physical Function in HIV+ Men
Men infected with the HIV virus (the virus that causes AIDS) often lose weight even though
 they may try to eat more food to gain weight. The reasons for this weight loss are not clear.
 Many men with HIV have low levels of testosterone in their blood. Testosterone is a hormone
 that is naturally produced in the bodies of both men and women and has important effects on
 building muscle and bone mass. The purpose of this study is to find out if providing
 additional testosterone to HIV infected men who have low testosterone can help them gain
 weight, increase their muscle mass, and feel better. The study will also help see if
 testosterone improves the efficiency with which your body produces and uses energy including
 fat. The dose of testosterone being used in this study will raise testosterone levels in the
 blood to higher than normal levels (2-3 times normal level).
Purpose. Although the prevalence of weight loss in HIV-infected individuals has decreased in
 the developed world with the availability of highly active antiretroviral therapy, it
 continues to be a significant problem worldwide, and in the USA. The pathophysiology of
 weight loss in HIV-infected individuals is undoubtedly complex; decreased energy intake,
 metabolic dysregulation, intercurrent opportunistic infections, gastrointestinal infections
 and malabsorption, and hormonal abnormalities all contribute to the multifactorial origin of
 weight loss. Although patients with HIV-infection may lose both fat and lean tissue, the loss
 of lean body mass is an important aspect of the weight loss associated with wasting. Weight
 loss in HIV-infected patients is a good predictor of survival, risk of hospitalization, and
 opportunistic infections. The magnitude of depletion of nonfat tissues is an important
 determinant of the time of death in AIDS. One correctable factor in the complex
 pathophysiology of sarcopenia in HIV-infection is androgen deficiency. There is a high
 prevalence of low testosterone levels in HIV-infected men. Spontaneous and
 experimentally-induced androgen-deficiency in young men is associated with decreased muscle
 mass and strength. Testosterone replacement increases lean body mass, muscle strength, and
 muscle protein synthesis in androgen-deficient, young men. The studies supported by this
 grant in the previous budget period and others have demonstrated that testosterone
 replacement of HIV-infected men with weight loss and low testosterone levels is associated
 with an increase in fat-free mass and maximal voluntary muscle strength. Similarly,
 testosterone replacement of older men with low testosterone levels is associated with gains
 in fat-free mass and grip strength. However, it remains unknown whether testosterone-induced
 increases in fat-free mass and maximal voluntary strength are associated with clinically
 meaningful improvements in physical function and perceptions of physical function. Therefore,
 the primary objective of this competing renewal application is to determine if testosterone
 replacement of HIV-infected men with weight loss and low testosterone levels will improve
 objective measures of physical function, perceptions of physical function and body image. Our
 previous study demonstrated that testosterone replacement in HIV-infected men with low
 testosterone levels is associated with an increase in maximal muscle strength. However,
 testosterone effects on other important measures of muscle performance, such as power and
 fatigability that are important determinants of physical function, are not known. A second
 objective is to determine if testosterone replacement improves lower extremity power and
 fatigability.

 The mechanisms by which testosterone increases muscle mass also remain unknown. Therefore, a
 third objective is to elucidate the mechanisms by which testosterone increases muscle mass
 and to determine its effects on energy balance.

 Design. The study will be a randomized, placebo-controlled, double-blind study of
 HIV-infected men.

 Sample Size Estimate. We estimate that approximately 50 men will be needed in each treatment
 group to test the proposed hypotheses (total 100 subjects).

 Location: Subjects will be seen at the King/Drew Medical Center CRC (1720 E. 120th Street,
 Los Angeles, CA 90059) for all their visits.

 Randomization and Subject Assignment. Subjects who meet the eligibility criteria will be
 randomly assigned to receive either testosterone enanthate (300 mg/weekly intramuscularly) or
 placebo.

 Experimental Protocol. The study will consist of a screening phase, a 2-week control period,
 a 16-week treatment phase, and a 4-month recovery phase. We have selected a 16-week treatment
 period because the effects of testosterone on fat-free mass and muscle strength become
 manifest within this time period in healthy hypogonadal men, eugonadal men, and in
 HIV-infected men with weight loss.

 Inclusion criteria A. Is the subject HIV positive, male and 18-60 years?

 B. Is the subject wasting:

 • a progressive weight loss within the previous 6 months of between 5-15 % of body weight,
 calculated by the equation (a-b)/a x 100% (a=highest weight in last6 months and b= present
 weight at screening), or • a BMI between 17 and 20 (= an actual body weight at screening of
 85-95% of the lower limit of ideal weight), C. Is there an energy intake of calories of at
 least 80% of the estimated energy requirements? D. Is the subject On stable and potent
 antiretroviral therapy for at least 12 weeks, and in whom, in the opinion of the primary care
 provider, a change in antiretroviral therapy is unlikely in the next 4 months. Stable therapy
 may include those not on any antiretroviral therapies and whom, in the opinion of the primary
 care provider, will not be starting antiretroviral therapy in the next 4 months, E. Does the
 subject have a CD4 cell count > 50/mm3 or a viral load (HIV- copy number) < 10,000/ml ? F. Is
 the subject able and willing to comply with the trial protocol ? G. Is the subjects
 testosterone levels <400ng/dL? H. Is the subject able and willing to give informed consent in
 writing ?

 Exclusion criteria

 A. Does the subject have concurrent severe lipodystrophy according to the subject and the
 investigator? B. Does the subject have a history of hypersensitivity to anabolic steroids or
 to growth hormone? C. Does the subject have a history of prostatic or mammary cancer? D. Did
 the subject use nandrolone decanoate, growth hormone, androgen treatment or any other
 anabolic or appetite stimulating agents with the past 6 months ? E. Did the subject
 chronically use systematic corticosteroids (at least one month in the previous 6 months)
 except for topical applications? F. Does the subject have significant cardiac, renal, hepatic
 or other diseases that, in the opinion of the Investigator, may put the subject at risk if
 entered onto the trial or prevent successful completion of the trial ? 15. Has the subject
 had an AIDS defining illness (CDC HIV Classification, 1993: Clinical Category C)within the
 previous 3 months (except HIV wasting syndrome) ? G. Does the subject have a malignancy,
 other that Kaposi's Sarcoma localized to the skin ? H. Has the subject been involved in
 vigorous resistance exercise training programs (body building)in the last 3 months? 18. Dose
 the subject have diabetes mellitus? I. Is the active drug and/or alcohol use which would
 interfere with compliance for the study according to the investigator ? J. Did the subject
 receive investigational treatment except stable antiretroviral investigational drug in the
 last 12 weeks ?

 K. Has the subject any of the following blood tests results:

 Liver function test (ALAT/SGPT, ASAT/SCOT) > 5x the upper limit of the normal range (ULN)
 Cholesterol total > 3x ULN Alkaline Phosphotase >5 ULN or > 3xULN if bilirubin is above
 normal Serum Creatine > 2x ULN Platelet count < 50x 109 /L Haemoglobin < 8.0 g/L > 18g/dL PSA
 > 4 ng/ml Hct > 48 % L. Concomitant meds as exclusion (rhGh, IGF-1, other anabolic agents,
 appetite simulants, testosterone, ketoconazole, dilantin, phenobarbital, creatin, high dose
 of amino-acid supplements, protein supplements, androstenedione, DHEA & marinol)? M. Severe
 symptoms of BPH (American Urological Association [AUA] symptom index score of >14),prostate
 nodule, or induration on digital rectal examination [DRE] unless there has been a negative
 trans-rectal biopsy with last 3 months)? N. Untreated severe obstructive sleep apnea, as
 assessed by Berlin Symptom score? O. Limited neuromuscular, joint or some disease, or history
 of stroke with residual neurological defect that would preclude measurements of muscle
 strength of physical function? P. Significant diarrhea defined as 6 or more stools per day
 with recent change in bowel habits towards more frequent stools, especially if associated
 with weight loss and fever.

 Outcome Measures

 Our primary outcome measure is change from baseline in three important measures of physical
 function (stair climbing power, walking speed, and lifting task). These measures were
 selected because they are important for activities of daily living.

 We will measure changes in maximal voluntary muscle strength, power, and muscle fatigability
 using the leg press exercise. This exercise was selected because it utilizes large muscle
 groups of the lower extremity that are important for functional activities, and is
 androgen-responsive (39).

 Change in fat-free mass by dual energy X-ray absorptiometry (DEXA). Previous studies have
 already established that testosterone replacement increases fat-free mass. This study is
 focused on measures of muscle performance and physical function; therefore, we have not
 included more detailed assessment of body composition by deuterium water and sodium bromide.

 Muscle volume of the non-dominant thigh will be measured by magnetic resonance imaging.

 Intramuscular concentrations of myostatin, IGF-I, and IGFBP-4 mRNA will be measured by RT-PCR
 and protein by western blot analysis. The ubiquitin, and C3 and C9 proteasome mRNA will be
 measured by northern analysis.

 Changes in perceptions of physical function, and body image. In addition to using global
 health related quality of life instruments, which have many domains that are not
 androgen-responsive, we will focus on assessment of perceptions of physical function,
 fatigue, and body image. These instruments have been demonstrated to be responsive to
 androgen replacement in older men with low testosterone levels (48).

 Total and free testosterone, and dihydrotestosterone levels will be measured as markers of
 testosterone bioavailability. Serum LH, FSH and SHBG levels will be measured as markers of
 androgen action.

 Safety Measures. Plasma lipids, apolipoproteins, and lipoprotein particles will be measured
 to assess testosterone effects on these markers of cardiovascular risk profile. Hemoglobin,
 liver enzymes (ALT, AST, bilirubin, GGT, alkaline phosphatase), serum PSA, digital rectal
 examination and AUA BPH symptom score will be monitored as safety parameters.

 Energy Expenditure.. We will measure resting energy expenditure by indirect calorimetry,
 using a novel, handheld device known as the MedGem (HealtheTech, Golden Colorado) Neiman et
 al (Neiman DC, Trone GA, Austin MD. A new handheld device for measuring resting metabolic
 rate and oxygen consumption. J Am Diet Assoc 2003; 103(5 588-593) have validated this device
 in 63 males adult men and women with BMI between 19 and 56 kg/m2 against Douglas bags with
 duplicate measurements on each of two nonconsecutive days within a 14 day period. Since there
 were no differences between tests or between days for either the MedGem or the Douglas bags,
 the four tests for each device were pooled. The mean difference for the pooled results
 between MedGem and Douglas bags was 7 Kcal/day (0.4%). The thermic effect of food will be
 measured by indirect calorimetry, using the same MedGem apparatus with measurements during
 the last 15 minutes of each of five hours after ingestion of a standardized meal. We will
 also measure resting energy expenditure by use of the Deltatrac II device. After subjects
 have rested in bed for at least 5 minutes, oxygen consumption and carbon dioxide production
 will be measured using a ventilated canopy system for 20 minutes (Deltatrac II).

 The rates of ATP synthesis will be measured by 31P and 13C nuclear magnetic resonance (NMR)
 spectroscopy. The rates of substrate oxidation in the citric acid cycle will be estimated
 from the specific activity of 4-13C glutamate during steady state infusion of 13C-1 acetate.
 The ratio of ATP synthesis measured by NMR spectroscopy and fuel oxidation measured by steady
 state 13-1 acetate infusion will be used as a measure of mitochondrial coupling of oxidation
 and phosphorylation. In addition, we will also measure mitochondrial energy coupling in
 isolated muscle fibers obtained from biopsies of vastus lateralis directly by measuring P:O
 ration using an oxygen electrode.

 Body core temperature will be measured by obtaining rectal temperature, using a precise and
 accurate thermo-couple thermister.

 Free fatty acid flux and adipose tissue lipolysis will be measured using [1-13C] palmitate
 and[2H5] glycerol isotope infusion, respectively. Fat oxidation will be measured by the
 release and quantitation of 1-13C-CO2 released during exhalation after infusion of the
 [1-13C] palmitate. [2H2] glucose isotope will be used to measure insulin sensitivity. One to
 two weeks before the second palmitate infusion, a single injection of sodium [1-13C]
 bicarbonate (1.76 µmol/kg; 90% enriched, sterile and pyrogen free; Mass Trace) will be used
 to calculate the acetate correction factor (ACF). The ACF accounts for 13C-label lost in
 exchange reactions in the tricarboxylic acid cycle. After 135 min of tracer equilibration,
 breath samples will be obtained in 15-min intervals up to 150 minutes and 5 minute intervals
 from 150 to 180 minutes. Non-esterified free fatty acid levels will be measured at baseline,
 mid-study (day 56) and at the end of treatment by a fasting blood measurement.
Inclusion Criteria:

 -  HIV positive men, 18-60 years of age, with objective evidence of HIV-infection with
 low to low-normal testosterone levels (<400 ng/dL). In boys before the age of 18, the
 hormonal and body composition changes of puberty can confound the data. We will
 exclude men over 60 because of age-related changes in testosterone levels and body
 composition, and increased risk of prostate disease.

 -  Documented weight loss within the previous 6 months of between 5-15% of body weight,
 or an actual body mass index (BMI) at screening of between 17 and 20 (= 85-95% of the
 lower limit of ideal weight).

 -  An energy intake of at least 80% of the estimated requirements. On stable and potent
 antiretroviral therapy for at least 12 weeks, and in whom, in the opinion of the
 primary care provider, a change in antiretroviral therapy is unlikely in the next 4
 months. Stable therapy may include those not on any antiretroviral therapies and whom,
 in the opinion of the primary care provider, will not be starting antiretroviral
 therapy in the next 4 months CD4 cell count >50 /mm3, and HIV-copy number less than
 10,000 copies/ml Testosterone levels <400ng/dL Able and willing to provide informed
 consent and comply with the protocol

 Exclusion Criteria:

 -  Concurrent severe lipodystrophy* according to the patient and the investigator,
 defined as "the new appearance of thin extremities due to loss of subcutaneous fat
 (especially the medial compartment of the thigh) along with the new appearance of
 prominent veins. Loss of tissue in the buccal fat pad and subgluteal region provides
 further evidence that thin extremities may be in large part due to loss of fat and not
 just muscles."

 -  History of prostatic or mammary cancer

 -  Significant diarrhea defined as 6 or more stools per day with recent change in bowel
 habits towards more frequent stools, especially if associated with weight loss and
 fever

 -  Use of any androgen, growth hormone, or other anabolic or orexigenic agents within the
 past 6 months

 -  Use of systemic corticosteroids, except for topical application

 -  Significant cardiac, renal, hepatic or other diseases that, in the opinion of the
 Investigator, may put the subject at risk if entered onto the trial or prevent
 successful completion of the trial.

 -  AIDS defining illness (CDC HIV Classification, 1993: Clinical Category C) within the
 previous 3 months (except HIV wasting syndrome)

 -  Malignancy, other than Kaposi's Sarcoma localized to the skin

 -  Involvement in (vigorous) resistance exercise training programs (body building) in the
 past 3 months

 -  Diabetes mellitus Limiting neuromuscular, joint or bone disease, or history of stroke
 with residual neurological defect that would preclude measurements of muscle strength
 or physical function

 -  Severe symptoms of BPH (American Urological Association [AUA] symptom index score of
 >14), prostate nodule or induration on digital rectal examination (DRE) unless there
 has been a negative transrectal biopsy within 3 months, and prostate specific antigen
 (PSA) > 4

 -  Untreated severe obstructive sleep apnea, as assessed by Berlin's symptom score.

 -  Current alcohol or drug dependence which would interfere with compliance for the study

 -  Subject receive investigational treatment except stable antiretroviral investigational
 drug in the last 12 weeks

 -  Subject have a history of hypersensitivity to anabolic steroids or to growth hormone

 -  Any of the following blood test results:

 -  Liver function test (ALT, AST) 5x the upper limit of the normal range (ULN)

 -  Alkaline Phosphotase > 5x ULN or > 3x ULN if bilirubin is above normal

 -  Cholesterol total (> 5 x ULN) or triglycerides 700 mg/dL

 -  Serum Creatinine 2x ULN

 -  Hemoglobin 8.0 g/dl or >18 g/dL

 -  Platelet count < 50x109/L

 -  HCT >48%

 -  PSA 4 ng/ml.

 -  Concomitant Medications: Men who have received in the preceding 6 months or are
 currently using androgenic steroids, rhGH, IGF-I or other anabolic agents or appetite
 stimulants will be excluded. Also, excluded are drugs that affect testosterone
 secretion or metabolism such as ketoconazole, dilantin, and phenobarbital. Patients
 who have been on a stable dose of erythropoietin for at least 3 months will be allowed
 to continue the drug. The changes in antiretroviral therapy except for changes within
 the same class of drugs are not allowed. The use of corticosteroids, except for
 topical application, is not allowed. The food supplements that might affect body
 composition such as creatine, high dose amino-acid supplements, whey protein
 supplements, androstenedione, DHEA, and marinol, are also not allowed.

 -  On the Exclusion of Women. Women are not being included in this study because
 testosterone administration in these doses will inevitably cause virilization, and is
 ethically unacceptable.