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Rapid genomic changes induced by PTH, SIK-inhibition, FGF23, and 1,25(OH)2D3 in the mouse kidney

ABSTRACT: In vivo ChIP-seq in mouse kidney: we examine the genomic recruitment of VDR, RXR, pCREB, CBP, CRTC2 (TORC2), SRC1, SRC3, BRD4, RNApolII, H3K9ac, H3K27ac, and H3K36me3 after intraperitoneal injection of 10 mg/kg body weight (bw) 1,25(OH)2D3 (in propylene glycol), 230 mg/kg bw PTH (1–84) (in phosphate buffered saline (PBS)), 50 mg/kg bw FGF23 (in PBS + 0.1% BSA), 30 mg/kg YKL-05-099 (PBS + 25mM HCl), 40 mg/kg SK-124 (15% HPBCD (hydroxypropyl β-cyclodextrin)), or vehicle (EtOH, PBS, or HPBCD). YKL-05-099 and SK-124 are salt-inducible kinase inhibitors that liberate CRTC2 from sequestration in the cytoplasm and allow CRTC2 translocation to the nucleus. Our findings show that these TFs and coactivators contribute to transcription of genes in the kidney involved in vitamin D metabolism, demonstrates SIK-inhibition as a key modulator of vitamin D metabolism, and provides molecular insight into the coordinated mechanistic actions of PTH, FGF23, and 1,25(OH)2D3 in the mouse kidney that regulate mineral homeostasis.

ORGANISM(S): Mus musculus

PROVIDER: GSE206777 | GEO | 2022/09/30

REPOSITORIES: GEO

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Project description:Human kidney was obtained from the University of Wisconsin Madison Organ Procurement Program from a deceased 69 year old female patient and the cortex was dissected from 3 different cortex locations. Associated publication abstract: Targeted genomic deletions identify diverse enhancer functions and generate a kidney-specific, endocrine-deficient Cyp27b1 pseudo-null mouse Vitamin D3 is terminally bioactivated in the kidney to 1α,25-dihydroxyvitamin D3 (1,25(OH)2D3) via cytochrome P450 family 27 subfamily B member 1 (CYP27B1), whose gene is regulated by parathyroid hormone (PTH), fibroblast growth factor 23 (FGF23), and 1,25(OH)2D3. Our recent genomic studies in the mouse have revealed a complex kidney-specific enhancer module within the introns of adjacent methyltransferase like 1 (Mettl1) and Mettl21b that mediate basal and PTH induced expression of Cyp27b1 and FGF23- and 1,25(OH)2D3-mediated repression. Gross deletion of these segments in mice has severe consequences on Cyp27b1 regulation and skeletal phenotype, but does not affect Cyp27b1 expression in non-renal target cells (NRTCs). Here, we report a bimodal activity in the Mettl1 intronic enhancer with components responsible for PTH-mediated Cyp27b1 induction and 1,25(OH)2D3-mediated repression and additional activities, including FGF23 repression, within the Mettl21b enhancers. Deletion of both submodules eliminated basal Cyp27b1 expression and regulation in the kidney, leading to systemic and skeletal phenotypes similar to those of Cyp27b1-null mice. However, basal expression and lipopolysaccharide-induced regulation of Cyp27b1 in NRTCs was unperturbed. Importantly, dietary normalization of calcium, phosphate, PTH, and FGF23 rescued the skeletal phenotype of this mutant mouse, creating an ideal in vivo model to study non-renal 1,25(OH)2D3 production in health and disease. Finally, we confirmed a conserved chromatin landscape in human kidney that is similar to that in mouse. These findings define a finely balanced homeostatic mechanism involving PTH and FGF23 together with protection from 1,25(OH)2D3 toxicity that is responsible for both adaptive vitamin D metabolism and mineral regulation.

Project description:Although localized to the mineralized matrix of bone, osteocytes are able to respond to systemic factors such as the calciotropic hormones 1,25(OH)2D3 and PTH. In the present studies, we examine the transcriptomic response to PTH in an osteocyte cell model and found that this hormone regulated an extensive panel of genes. Surprisingly, PTH uniquely modulated two cohorts of genes, one that was expressed and associated with the osteoblast to osteocyte transition and the other a cohort that was expressed only in the mature osteocyte. Interestingly, PTHM-bM-^@M-^Ys effects were largely to oppose the expression of differentiation-related genes in the former cohort, while potentiating the expression of osteocyte-specific genes in the latter cohort. A comparison of the transcriptional effects of PTH with those obtained previously with 1,25(OH)2D3 revealed a subset of genes that was strongly overlapping. While 1,25(OH)2D3 potentiated the expression of osteocyte-specific genes similar to that seen with PTH, the overlap between the two hormones was more limited. Additional experiments identified the PKA-activated phospho-CREB (pCREB) cistrome, revealing that while many of the differentiation-related PTH regulated genes were apparent targets of a PKA-mediated signaling pathway, a reduction in pCREB binding at sites associated with osteocyte-specific PTH targets appeared to involve alternative PTH activation pathways. That pCREB binding activities positioned near important hormone-regulated gene cohorts were localized to control regions of genes was reinforced by the presence of epigenetic enhancer signatures exemplified by unique modifications at histones H3 and H4. These studies suggest that both PTH and 1,25(OH)2D3 may play important and perhaps cooperative roles in limiting osteocyte differentiation from its precursors while simultaneously exerting distinct roles in regulating mature osteocyte function. Our results provide new insight into transcription factor-associated mechanisms through which PTH and 1,25(OH)2D3 regulate a plethora of genes important to the osteoblast/osteocyte lineage. Fully differentiated IDG-SW3 cells were treated in biological triplicate with 100nM PTH for 24 hours prior to mRNA isolation and sequencing. Vehicle treated samples were previously published in GSE54783: http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSM1323967 http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSM1323968 http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSM1323969

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Rapid genomic changes induced by PTH, SIK-inhibition, FGF23, and 1,25(OH)2D3 in the mouse kidney

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