Male Syrian golden hamsters were given 15 weekly intratracheal instillations with suspensions of coal fly ash or oil fly ash. Controls were instilled with saline containing gelatine (0.5 g/100 mL) or to check particle effects with suspensions of hematite (Fe2O3). The common weekly dose was 4.5 mg/hamster. In addition, one subgroup of hamsters was treated with oil fly ash at a weekly dose of 3.0...

Previous results have shown that when compared to male Syrian hamsters, female Syrian hamsters have a distinct predisposition to acquire amyloidosis either normally with aging or experimentally with sodium caseinate or diethylstilbestrol (DES) treatments. In the present study, we tested the influence of testosterone on expression of amyloid to determine if this hormone was solely responsible fo...

Aim of the present study was to investigate the anticlastogenic and antigenotoxic effect of andrographolide in the bone marrow cells of golden Syrian hamsters treated with 7,12dimethylbenz(a)anthracene (DMBA). The frequency of bone marrow micronucleated polychromatic erythrocytes (MnPCEs) was used as cytogenetic end point to assess the anticlastogenic effect of andrographolide in hamsters treat...

The circadian clock of mammals, located in the suprachiasmatic nuclei (SCN) of the hypothalamus, has been demonstrated to integrate day length change from long (LP) to short photoperiod (SP). This photoperiodic change induces in Syrian hamsters a testicular regression through melatonin action, a phenomenon that is inhibited when hamsters have free access to a wheel. The intergeniculate leaflets...

BROWNE, S. A. H. AND K. T. BORER. Basis for the exercise-induced hyperphagia in adult hamsters. PHYSIOL. BEHAV. 20(5) 553-557, 1978.In adult female golden hamsters (Mesocricetus auratus, Waterhouse) voluntary exercise is associated with increased food intake and accelerated somatic growth. We examined the possible interdependence between increased food intake and accelerated somatic growth by m...

We examined the effect of different dietary supplements on seasonal changes in body mass (m(b)), metabolic rate (MR) and nonshivering thermogenesis (NST) capacity in normothermic Siberian hamsters housed under semi-natural conditions. Once a week standard hamster food was supplemented with either sunflower and flax seeds, rich in polyunsaturated fatty acids (FA), or mealworms, rich in saturated...

The first goal of this study was to determine whether chronic injection of nicotine alters endothelium-dependent arteriolar dilatation. We measured the diameter of cheek pouch resistance arterioles (approximately 50 microm in diameter) in response to endothelium-dependent (acetylcholine and ADP) and -independent (nitroglycerin) agonists in control hamsters and hamsters treated with nicotine (2 ...

Respiratory failure in patients with COPD may be caused by insufficient force production or insufficient endurance capacity of the respiratory muscles. Anabolic steroids may improve respiratory muscle function in COPD. The effect of anabolic steroids on mitochondrial function in the diaphragm in emphysema is unknown. In an emphysematous male hamster model, we investigated whether administration...

Significant borreliacidal antibody was induced in volunteers and hamsters 60 days after primary and secondary vaccination with high concentrations of recombinant outer surface protein A (rOspA). However, the borreliacidal antibody response waned rapidly. Only 1 person had detectable cidal activity 180 days after vaccination. Similarly, the borreliacidal antibody response waned rapidly in hamste...

A therapeutic effect was observed when an aqueous extract of the common clam (Mercenaria mercenaria) was injected directly into and around small, superficial, and slowly growing solid s.c. adenovirus 12 and SV40 virus-induced tumors in hamsters. The treatment was given daily or at selected intervals. Half of 74 treated hamsters showed complete tumor regression within 4 weeks after the 1st injec...