Volume 12, Issue 3, Pages (September 2010)

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1 Volume 12, Issue 3, Pages 295-305 (September 2010)
Rescue of Obesity-Induced Infertility in Female Mice due to a Pituitary-Specific Knockout of the Insulin Receptor  Kathryn J. Brothers, Sheng Wu, Sara A. DiVall, Marcus R. Messmer, C. Ronald Kahn, Ryan S. Miller, Sally Radovick, Fredric E. Wondisford, Andrew Wolfe  Cell Metabolism  Volume 12, Issue 3, Pages (September 2010) DOI: /j.cmet Copyright © 2010 Elsevier Inc. Terms and Conditions

2 Cell Metabolism 2010 12, 295-305DOI: (10.1016/j.cmet.2010.06.010)
Copyright © 2010 Elsevier Inc. Terms and Conditions

3 Figure 1 Development of PitIRKO Mouse
(A) Mouse insulin receptor (IR) gene. Mice bearing loxP sites flanking exon 4 of the IR were crossed with mice carrying common α subunit-driven Cre recombinase to generate pituitary-specific knockdown of the IR, or PitIRKO. Primers P1 and P2 were designed to indicate the presence of the loxP site 3′ of exon 4. Primer P3 and P2 produce a band following Cre recombination. (B) PCR products from reactions performed on genomic DNA from a variety of tissues indicate the presence of homozygous floxed alleles (320 bp) in all tissues and the knockout (KO) product following Cre recombination in the pituitary (220 bp). Cell Metabolism  , DOI: ( /j.cmet ) Copyright © 2010 Elsevier Inc. Terms and Conditions

4 Figure 2 Reproductive Assessment of Lean PitIRKO Female Mice
(A) Representative vaginal cytology plot from a lean PitIRKO female mouse. Eight PitIRKO females were analyzed, and each showed a regular cycling pattern. (B) Mating success rate of WT lean and PitIRKO lean females. (C) Gestation periods. (D) Litter sizes. WT lean, n = 13; PitIRKO lean, n = 10. Data are represented as mean ±SEM. Cell Metabolism  , DOI: ( /j.cmet ) Copyright © 2010 Elsevier Inc. Terms and Conditions

5 Figure 3 DIO Model (A) Total body weight of WT lean, PitIRKO lean, WT DIO, and PitIRKO DIO mice over the course of 12 weeks. (B–D) Fasting blood glucose levels (B), fasting serum insulin levels (C), and fasting serum leptin levels (D) across groups. WT lean, n = 12; PitIRKO lean, n = 8; WT DIO, n = 25; PitIRKO DIO, n = 10. Data are represented as mean ±SEM. Asterisks indicate a significant difference between lean and DIO: ∗p value less than 0.05, ∗∗p value less than 0.01. Cell Metabolism  , DOI: ( /j.cmet ) Copyright © 2010 Elsevier Inc. Terms and Conditions

6 Figure 4 Basal Gonadotropin Levels Are Elevated in WT DIO Mice, and WT DIO Mice Are the Most Responsive to GnRH Stimulation (A) Baseline serum luteinizing hormone (LH) levels across groups. Assay detection limit = 0.048 ng/ml. (B) Baseline follicle stimulating hormone (FSH) levels across groups. Assay detection limit = 0.032 ng/ml. WT lean, n = 12; PitIRKO lean, n = 10; WT DIO, n = 24; PitIRKO DIO, n = 10. (C and D) Basal relative αGSU (C) and LH-β mRNA levels (D) across groups. (E) Fold change in serum LH following injection of GnRH. (F) Basal relative GnRH receptor mRNA levels. (G) GAPDH was also measured as an unregulated control. WT lean, n = 11–16; PitIRKO lean, n = 7–8; WT DIO, n = 12–19; PitIRKO DIO, n = 8–10. Data are represented as mean ±SEM. Cell Metabolism  , DOI: ( /j.cmet ) Copyright © 2010 Elsevier Inc. Terms and Conditions

7 Figure 5 PitIRKO Rescues Estrous Cyclicity and Ovulation on DIO Background (A) Representative vaginal cytology plots from lean and DIO WT and PitIRKO mice. (B) Percent time spent in each stage of the estrous cycle by WT lean, WT DIO, and PitIRKO DIO animals. WT lean, n = 9; WT DIO, n = 25; PitIRKO DIO, n = 8. (C) Representative histological sections of ovaries taken from WT lean, WT DIO, and PitIRKO DIO mice. ∗ = corpora lutea. (D) Total corpora lutea (CL) counts from each group. WT lean, n = 13; PitIRKO lean, n = 4; WT DIO, n = 11; PitIRKO DIO, n = 7. Data are represented as mean ±SEM. Asterisks indicate a significant difference between WT DIO and WT lean/PitIRKO DIO: ∗∗p value less than 0.01, ∗∗∗p value less than Cell Metabolism  , DOI: ( /j.cmet ) Copyright © 2010 Elsevier Inc. Terms and Conditions

8 Figure 6 PitIRKO Rescues Infertility Associated with DIO
(A) Representative breeding study illustration: female mice were paired with four WT males for 7 days and then returned to their own cages for 3 weeks to allow for birth of pups, indicating a successful pairing. Each row represents one individual female, and each bar represents one of her pairings. Five examples were chosen from each group in order to illustrate the fertility phenotypes. (B) Mating success rate for WT and PitIRKO groups under lean and DIO conditions. WT lean, n = 14; PitIRKO lean, n = 7; WT DIO, n = 13; PitIRKO DIO, n = 7. Data are represented as mean ±SEM. Cell Metabolism  , DOI: ( /j.cmet ) Copyright © 2010 Elsevier Inc. Terms and Conditions

9 Figure 7 Preserved Insulin Sensitivity in WT DIO Pituitary
(A) Serum LH levels before and after mice were injected with insulin. WT lean, n = 10; PitIRKO lean, n = 12; WT DIO, n = 7; PitIRKO DIO, n = 11. (B) Signaling assay showing baseline and insulin-stimulated p-Akt in the pituitary, liver, and muscle. AU = Arbitrary Units. Three to five animals were used in each group. Data are represented as mean ±SEM. Cell Metabolism  , DOI: ( /j.cmet ) Copyright © 2010 Elsevier Inc. Terms and Conditions