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Biomedical subjects

K Grunewald

Publications and source records attributed to K Grunewald.

At least 19 recordsLinked to original sources
PubMed2000

The effects of dietary energy restriction on overloaded skeletal muscle in rats.

We evaluated the effects of three levels of energy intake, 73 % (CON73), 81 % (CON81) and 100 % (CON100) of the ad libitum intake of the control diet, on skeletal muscle growth induced by functional overload in male rats. Unlike most previous studies which have employed chronic or acute food restriction where all nutrients are reduced in the diet, the present study tested the effects of energy deprivation as a single factor without inducing other nutritional deficiencies. Muscular growth of plantaris and soleus muscles was induced by removal of synergist gastrocnemius muscles in one hindlimb; muscles in the other leg were used as sham-operated intra-animal controls. After 30 d, rats on the energy-restricted CON73 and CON81 diets gained less weight and had smaller livers, kidneys, hearts and fat pads (epididymal, retroperitoneal and omental) than CON100 rats They also had smaller sham-operated plantaris muscles (CON73 --13 %, CON81 --9 %) containing less total protein (CON73 --14 %; CON81 --10 %) than CON100 rats However, the same measurements in overloaded plantaris muscles were similar among groups. Soleus muscle mass and protein contents were not significantly affected by energy restriction in our study. Percentage distributions of myosin heavy-chain isoforms (types I, IIa, IIx and IIb) were similar among rats in CON100, CON81 and CON73 groups for both plantaris and soleus muscles. We conclude that the growth reduction of plantaris muscle induced by energy restriction at 73 % and 81 % for 30 d was prevented by functional overload in male rats.

Analysis of Variance↗
PubMed1994

Acute thoracic aortic occlusion resulting from complex aortic dissection and presenting as paraplegia.

Acute paraplegia from an aortic occlusion or dissection is a surgical emergency. Prompt recognition and treatment may mitigate irreversible spinal cord injury. Aortography is commonly used when an aortic lesion is suspected as the cause of acute paraplegia. Transesophageal echocardiography is becoming increasingly used for the evaluation of aorta, diagnosing aortic dissection promptly at the bedside, and was able to define the cause of the spinal cord ischemia.

Acute Disease↗
PubMed1988

Stimulation of human early and late erythropoietic progenitor cells by insulin: evidence for different mechanisms.

In order to investigate cellular mechanisms involved in insulin stimulation of erythropoiesis, we have studied the response of early (BFU-e) and late (CFU-e) erythroid progenitor cells in a serum-free agar culture system. In this assay system, CFU-e proliferation occurred in media containing low-density lipoproteins, bovine serum albumin, transferrin and recombinant erythropoietin (rEPO). Insulin in physiological concentrations as low as 10(-12)M, added directly to cultures, augmented CFU-e colony formation. This stimulatory effect was also seen when monocyte- and T lymphocyte-depleted cells from normal donors were cultured. In contrast, BFU-e was not stimulated by media devoid of insulin. Occurrence of BFU-e colonies required the presence of insulin in concentrations higher than 10(-8)M. This insulin effect was not dependent on the presence of monocytes and T lymphocytes. Delayed addition studies of rEPO to insulin containing cultures revealed a slight but significant survival rate of CFU-e. A similar survival rate was found for BFU-e. From this, we conclude that insulin stimulates CFU-e by an EPO-like activity. For BFU-e, however, the decline in the number of bursts caused by EPO deprivation implies that insulin does not act directly as a burst-promoting activity but that it probably induces the release of this activity from non-adherent and T lymphocyte-depleted bone marrow cells.

Animals↗