Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=26370269
&cmd=llinks): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests
in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 215
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\26370269
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Theor+Biol+Med+Model
2015 ; 12
(ä): 17
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Modeling the energetic cost of cancer as a result of altered energy metabolism:
implications for cachexia
#MMPMID26370269
Friesen DE
; Baracos VE
; Tuszynski JA
Theor Biol Med Model
2015[Sep]; 12
(ä): 17
PMID26370269
show ga
BACKGROUND: Cachexia affects most patients with incurable cancer. We hypothesize
that in metastatic cancer the mass of the tumor as well as its level of anaerobic
energy metabolism play a critical role in describing its energetic cost, which
results in elevated resting energy expenditure and glucose utilization, leading
to cachexia. Prior models of cancer cachexia may have underestimated the specific
energetic cost of cancer as they have not taken the range of tumor mass and
anaerobic energy metabolism fully into account. METHODS: We therefore modelled
the energetic cost of cancer as a function of the percentage of energy the cancer
produces anaerobically, based on resting energy expenditure, glucose turnover,
glucose recycling, and oxygen consumption in cancer patients found in previous
studies. RESULTS: Data from two clinical studies where tumor burden was estimated
and resting energy expenditure or oxygen consumption were measured lead to a
broad range of estimates of tumor cost from 190 to 470 kcal/kg tumor/day. These
values will vary based of the percentage of energy the cancer produces
anaerobically (from 0 to 100%), which in and of itself can alter the cost over a
2 to 3-fold range. In addition to the tumor cost/kg and the degree of anaerobic
metabolism, the impact on a given individual patient will depend on tumor burden,
which can exceed 1 kg in advanced metastatic disease. Considering these
dimensions of tumor cost we are able to produce a 2-dimensional map of potential
values, with an overall range of 100-1400 kcal/day. CONCLUSIONS: Quantifying the
energetic cost of cancer may benefit an understanding of the tumor's causation of
cachexia. Our estimates of the range of tumor cost include values that are higher
than prior estimates and suggest that in metastatic disease the tumor cost could
be expected to eclipse attempts to stabilize energy balance through nutrition
support or by drug therapies. Tumor mass and the percentage of anaerobic
metabolism in the tumor contribute to the cost of the tumor on the body and
potentially lead directly to negative energy balance and increased muscle
wasting.