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2018 ; 19
(1
): 207
Nephropedia Template TP
gab.com Text
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English Wikipedia
Lowered dietary phosphorus affects intestinal and renal gene expression to
maintain mineral homeostasis with immunomodulatory implications in weaned
piglets
#MMPMID29554878
Just F
; Oster M
; Büsing K
; Borgelt L
; Murani E
; Ponsuksili S
; Wolf P
; Wimmers K
BMC Genomics
2018[Mar]; 19
(1
): 207
PMID29554878
show ga
BACKGROUND: In monogastric animals, phosphorus (P) homeostasis is maintained by
regulating intestinal absorption, bone mobilization, and renal excretion. Since P
is a non-renewable resource, a shortage is imminent due to widespread over-usage
in the farming and animal husbandry industries. As a consequence, P efficiency
should be improved in pig production. We sought to characterize the
transcriptional response in re-/absorbing and excreting tissues in pigs to diets
varying in calcium: phosphorus ratios. Weaned piglets were assigned to one of
three groups fed diets varying in digestible P content for a period of five
weeks. Gene expression profiles were analyzed in jejunum, colon, and kidney.
RESULTS: Transcriptome analysis revealed that reduced dietary P intake affects
gene expression in jejunum and kidney, but not in colon. The regulation of
mineral homeostasis was reflected via altered mRNA abundances of CYP24A1,
CYP27A1, TRPM6, SPP1, and VDR in jejunum and kidney. Moreover, lowered abundances
of transcripts associated with the classical complement system pathway were
observed in the jejunum. In kidney, shifted transcripts were involved in
phospholipase C, calcium signaling, and NFAT signaling, which may have
immunomodulatory implications. CONCLUSIONS: Our results revealed local
transcriptional consequences of variable P intake in intestinal and renal
tissues. The adaptive responses are the result of organismal efforts to maintain
systemic mineral homeostasis while modulating immune features at local tissue
sites. Therefore, the deviation from the currently recommended dietary P supply
must be carefully considered, as the endogenous mechanisms that respond to low P
diets may impact important adaptive immune responses.