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  • Electronic Resource  (4)
  • Hippocampal pyramidal cells  (2)
  • diabetic nephropathy  (2)
  • 1
    ISSN: 1432-0428
    Keywords: Plasma lipoproteins ; albuminuria ; diabetic nephropathy ; glomerular filtration rate ; Type 1 (insulin-dependent) diabetes mellitus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The aim of this study was to assess the effect of simvastatin on plasma lipoproteins and renal function in hypercholesterolaemic Type 1 (insulin-dependent) diabetic patients with diabetic nephropathy. Twenty-six hypercholesterolaemic (total cholesterol ≽ 5.5 mmol/l) Type 1 diabetic patients with nephropathy were enrolled in a double-blind randomized placebo-controlled study for 12 weeks. The active treatment group (n -14) received simvastatin (10–20 mg/day) for 12 weeks while the remaining 12 patients received treatment with placebo. The results during simvastatin treatment (baseline vs 12 weeks): total cholesterol 6.6 vs 4.8 mmol/1 (p 〈 0.01), LDL-cholesterol 4.25 vs 2.57 mmol/l (p 〈 0.01) and apolipoprotein B 1.37 vs 1.06 mmol/l (p 〈 0.01). HDL-cholesterol, and apolipoprotein A-I remained unchanged. Total cholesterol, LDL-cholesterol, HDL-cholesterol, apolipoprotein A–I, apolipoprotein B remained unchanged during placebo treatment. Albuminuria measured during the simvastatin and the placebo treatment (baseline vs 12 weeks) (the data are logarithmically transformed before analysis because of their positively skewed transformation; geometric mean (×/÷ antilog SE) is indicated) was 458 (×/÷ 1.58) vs 393 (×/÷ 1.61) and 481 (×/÷ 1.62) vs 368 (×/÷ 1.78 μg/min (NS). Glomerular filtration rate during simvastatin and placebo treatment (baseline vs 12 weeks) was 64 vs 63 and 72 vs 74 ml·min−1·1.73 m−2, respectively. Two patients receiving simvastatin treatment were withdrawn, one due to gastrointestinal side effects and one due to myalgia. In conclusion, our short-term study in Type 1 diabetic patients with diabetic nephropathy did not reveal any beneficial effect on albuminuria despite a striking lipid-lowering effect of simvastatin in diabetic nephropathy.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0428
    Keywords: Type 2 (non-insulin-dependent) diabetes mellitus ; diabetic nephropathy ; apolipoprotein(a) ; cardiovascular disease ; lipid metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The relative mortality from cardiovascular disease is on average increased five-fold in Type 2 (non-insulin-dependent) diabetic patients with diabetic nephropathy compared to non-diabetic subjects. We assessed the possible contribution of dyslipidaemia in general and elevated serum apolipoprotein(a) (apo(a)) in particular. Type 2 diabetic patients with normo-, micro- and macroalbuminuria were compared with healthy subjects. Each group consisted of 37 subjects matched for age, sex and diabetes duration. Serum creatinine in the nephropathy group was 105 (54–740) Μmol/l. The prevalence of ischaemic heart disease (resting ECG, Minnesota, Rating Scale) was 57, 35, 19 and 2% in macro-, micro- and normoalbuminuric diabetic patients and healthy subjects, respectively. The prevalence of ischaemic heart disease was higher in all diabetic groups as compared to healthy subjects (p〈0.05), and higher in macroalbuminuric as compared to normoalbuminuric diabetic patients (p〈0.01). There was no significant difference between apo(a) in the four groups: 161 (10–1370), 191 (10–2080), 147 (10–942), 102 (10–1440) U/l (median (range)) in macro-, micro- and normoalbuminuric groups and healthy subjects. Serum total-cholesterol, HDL-cholesterol and LDL-cholesterol were not significantly different when comparing healthy subjects and each diabetic group. Apolipoprotein A-I was lower (p〈0.05) in all diabetic groups as compared to healthy subjects (nephropathy vs healthy subjects): 1.50±0.25 vs 1.69±0.32 g/l (mean ± SD). Triglyceride was higher (p〈0.05) in patients with nephropathy and microalbuminuria as compared to healthy subjects (nephropathy vs healthy subjects): 2.01 (0.66–14.7) vs 1.09 (0.41–2.75) mmol/l (median (range)). Apolipoprotein B was higher (p〈0.02) in patients with nephropathy as compared to the other three groups (nephropathy vs healthy subjects): 1.54±0.47 vs 1.33±0.30 g/l. In conclusion, our case-control study has confirmed that Type 2 diabetic patients with increased urinary albumin excretion frequently suffer from dyslipidaemia and cardiovascular disease. However, our study revealed no significant elevation in serum concentration of apo(a) in patients with diabetic nephropathy, but numbers were small.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 71 (1988), S. 588-596 
    ISSN: 1432-1106
    Keywords: Hippocampal pyramidal cells ; Phorbol esters ; Synaptic transmission ; Plasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary (1) The effect of active and inactive phorbol esters on synaptic transmission and on membrane properties of CA1 pyramidal cells in hippocampus have been analyzed by intracellular recording. (2) 4β-phorbol-12,13 dibutyrate (βPDBu), but not the α-isomer, increased the firing probability, reduced the spike latency and enhanced the EPSP amplitude in response to synaptic activation. The effect was similar to the changes seen in long term potentiation. After αPDBu addition it was possible to elicit further enhancement by tetanization, but not after βPDBu administration. (3) A slowly developing hyperpolarization was seen after active phorbol ester application without apparent changes in the soma input resistance. (4) Active phorbol esters reduced the slow afterhyperpolarization (AHP) in these cells without affecting the intermediate AHP.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 53 (1984), S. 431-443 
    ISSN: 1432-1106
    Keywords: Hippocampal pyramidal cells ; Repetitive firing ; Slow prepotentials ; f/I-curves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary (1)In order to study how hippocampal pyramidal cells transform a steady depolarization into discharges, CA1 pyramids (n = 32) were injected with 1.5 s long pulses of constant depolarizing current. (2) The firing in response to weak currents was in most cells, characterized by low frequency (0.2–5 Hz), slowly increasing depolarizations preceding each action potential (slow prepotentials, SPPs), a long latency (0.2–5 s) to the initial spike and lack of adaptation. (3) The SPPs, which lasted 30–2,000 ms, showed an increasing steepness with increasing current, and seemed to be a major regulating factor for the slow firing. (4) In response to stronger currents the discharge had a high initial frequency (100–350 Hz), followed by adaptation to steady state firing (5–50 Hz). Thirty of 32 cells showed a dip in the frequency (n = 5), or a pause (n = 25) lasting 250–1,000 ms between the initial burst of firing and the steady state. The pause occurred only at intermediate current strengths. (5) Additional spikes to the initial burst seemed to be recruited through the development of depolarizing waves. The initial slope of these waves resembled those of the SPPs. Similar waves occurred at the expected tune of occasionally missing spikes during steady state firing. (6) The variability (SD/mean) of the interspike intervals decreased with increasing frequency of firing. (7) The frequency-current (f/I) relation for the steady state firing showed a simple linear or convex shape, and lacked a secondary range. In contrast, the f/I plots for the initial few interspike intervals had both primary, secondary and tertiary ranges, like motoneurones.
    Type of Medium: Electronic Resource
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