vitamin d 3 and female reproduction: a role beyond bone health
DESCRIPTION
Vitamin D 3 and Female Reproduction: A Role Beyond Bone Health. Genevieve Neal-Perry, MD PhD Associate Professor Ob/ Gyn and Neuroscience Fellowship Director, Division of Reproductive Endocrinology and Infertility Albert Einstein College of Medicine and Montefiore Medical Center. - PowerPoint PPT PresentationTRANSCRIPT
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Vitamin D3 and Female Reproduction:
A Role Beyond Bone Health
Genevieve Neal-Perry, MD PhDAssociate Professor Ob/Gyn and Neuroscience
Fellowship Director, Division of Reproductive Endocrinology and Infertility Albert Einstein College of Medicine and Montefiore Medical Center
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Objective1) To describe vitamin D3 physiology2) To discuss the differential impact of in utero
+ perinatal vs. pubertal vitamin D3 deficiency on a. pubertyb. reproductive physiology
i. Hypothalamusii. Pituitaryiii. Ovary
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1) Fat soluble steroid hormone vitamin D3 steroid
hormone receptor (VDR)
RXR2) Genomic vs. non-genomic
Vitamin D3
classicalnon-classical
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Calicidiol ½ life =15 d
Caltriol ½ life =15 h
UV-B 20-30 min 2x wk
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Vitamin D3 Requirements Group FDA
Recommend Dose (IU)
Safe High FDA (IU)
Toxic Dose
Best Dose
Infants 0-12 months
400* <1000 1000-1500 400-800
Children 600* 2000 ≥3000- 4000
Pregnant Women
600* 2000
10,000 per day**
≥4000 800-1000 D3 /day
50,000 D2/2 week
50,000 D2/monthLactating Women
600*
Adults <50 600*Adults 51-70
600*
Adults >70 800**RDA and IOM recommendations **safe for at least 5 months
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0
500
1000
1500
2000
Inte
rnat
ion
Units
(IU)
Sunshine Cod liver oil (tbsp)
Cooked salmon (3 ½ oz)
Milk(8 oz)
Cereal (8 oz)
Egg Yolk
Swiss cheese ( 1 oz)
Warning Label !To achieve the daily recommendation of 600 IU of vitamin D3 you have to eat:30 eggs = 50 cubes of Swiss cheese =120 oz of cereal = 6 cups milk
Dietary Sources of Vitamin D3
Food Serving Vitamin D (IU)
Cod Liver Oil 1 Tbsp 1360Cooked Salmon 3 ½ oz 360
Cooked Mackerel 3 ½ oz 345Canned Tuna Fish 3 oz 200
Canned Sardines 1 ¾ oz 250Fortified OJ 8 oz 100
Fortified Milk 8 oz 98Fortified cereal 8 oz 40
Egg (yolk) 1 egg 20
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Health ImplicationsStatus Serum 25(OH)D3
nmol/liter ng/mlDeficient <30 <12Insufficient 30-49 16-19Adequate 50-124 20-49Toxic >125 >50
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1) People with dark skin pigmentation African American > Hispanic > Caucasian
2) Obese individuals3) Elderly4) Reproductive-aged women, neonates,
and adolescents
Who is at Risk for Vitamin D3 Deficiency?
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Vitamin D3 deficiencyRacial, Sex and Age
disparities
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Reproductive-aged women and neonates represent one of the largest groups with vitamin D3
deficiency
Yetley, Am J Clin Nutr 2008:88(2): 558S National Health and Nutrition Examination Survey 2000-2004
%
<50
nmol
/L v
it D
3
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Racial disparities in mean serum 25-OH D3 concentration from the National Health and
Nutrition Examination Survey 2000-2004
Yetley, E. A Am J Clin Nutr 2008;88:558S
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Increasing weight and black race widens disparities in vitamin D3 deficiency
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Why should Ob/Gyn MDs be concerned about sex and
racial disparities in vitamin D3 deficiency?
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“2 out of every 3 pregnant women in the U.S. have suboptimal vitamin D
status, with even higher prevalences reported among African-American and
Hispanic women”[Looker, et al. Am J Clin Nutrition 2008]
Increased medical costs!!
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Vitamin D3 Deficiency and Reproductive Health
Vitamin D3 deficiency
PCOS and Obesity
Recurrent pregnancy
loss
Infertility
Small for gestational
age
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In the lab……
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Overarching Objective
To determine the mechanism (s)by which VD3 regulates female
reproduction
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Overarching Hypothesis
Developmental VD3 deficiency disrupts hypothalamic-pituitary-gonadal physiology in females
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1) VDR and α-hydroxylase (cyp27b1) is widely distributed in reproductive tissue
2) Vitamin D3 is necessary for neuronal development
3) Vitamin D3 deficiency in humans is associated with reproductive dysfunction
4) Rodent models of vitamin D3 deficiencya. diet induced vitamin D3 deficiency in ratsb. Transgenic mice
Rationale
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Objective #1
Determine the effect of developmental VD3 deficiency
on puberty
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1) Transgenic cyp27b1 null mice
2) Wild type littermates
Experimental Model
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Experimental Design
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preconception perinatal
birth weaningon day 21
peripubertalintrauterine
conception 1) Vaginal opening2) 1st estrus3) Estrous cycling
Group 1: Control WT and KO (VD3 sufficient diet throughout)
Group 3: KO in utero and perinatal VD3 deficient diet Group 4: KO peripubertal VD3 deficient diet
Group 2
Group 3 Group 4
Group 2: KO in utero, perinatal and peripubertal VD3 deficient diet
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Does in utero, perinatal and peripubertal VD3 deficiency
affect puberty?
Mice exposed to in utero, perinatal and peripubertal VD3 deficiency
have a delayed pubertyVO 1st estrus Days between VO
and 1st estrus
preconception perinatal
birth Weaning D21
peripubertalin utero
conception VO1st Estrus
Group 2
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VD3 deficiency restricted to pregnancy and lactation does not
disrupt puberty.
preconception perinatal
birth weaning D21
peripubertalin utero
conception VO1st Estrus
Group 3
Will in utero and perinatal VD3 deficiency disrupt puberty?
VO 1st estrus Days between VO and 1st estrus
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Peripubertal VD3 deficiency delays puberty.
Will peripubertal VD3 deficiency disrupt puberty?
preconception perinatal
birth Weaning D21
peripubertalIn utero
conception VO1st estrus
Group 4
VO 1st estrus Days between VO and 1st estrus
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Modifiers of the pubertal transition
Modified from Roa et al., Molecular and Cellular Endocrinology 324(2010):87
Genetic background
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Is the effect of peripubertal VD3 deficiency on puberty associated with the Cyp27b1 knockout?
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VD3 deficiency does not significantly affect peripubertal growth curves
0 1 2 3 40.00
0.02
0.04
0.06WT (D+)KO (D+)KO (D-)
Postnatal growth
Postnatal age (wk)
BM
I (g/
mm
2 )
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Objective #2To determine if VD3 deficiency affects estrous cyclicity
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The mouse estrous cycle: the rodent equivalent of the menstrual cycle
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Estrous Cycle Length
Aver
age
cycl
e le
ngth
(day
s)
WT KO(D-) KO(D+)0
5
10
15
Peripubertal VD3 deficiency extends the estrous cycle
*
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Peripubertal VD3 deficiency disrupts the estrous cycle
* p<0.05
P (n
g/m
l)Pr
l (n
g/m
l)E 2
(pg/
ml)
LH (n
g/m
l)FS
H
(ng/
ml)
Estrus Diestrus-1 Diestrus-2 Proestrus Estrus
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WT VD3+
Day
estro
us s
tage
5 10 15 20
D2
D1
E
PKO VD3-
Day
estro
us s
tage
5 10 15 20
D2
D1
E
P
KO VD3+
Day
estro
us s
tage
5 10 15 20
D2
D1
E
P
Peripubertal VD3 deficiency disrupts the estrous cycle
LH surge LH surge LH surge
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Will VD3 supplementation restore the estrous cycle in adults exposed to peripubertal VD3 deficiency?
a, P<0.01 vs. WT; b, P<0.05 vs. D+
WT KO (D-) KO (D+)0
10
20
30
40
50 Diestrus I
% o
f tim
e sp
ent i
ndi
estr
us I
per 5
day
s
WT KO (D-) KO (D+)0
10
20
30
40
50 Diestrus II
a
% o
f tim
e sp
ent i
nD
iest
rus
II pe
r 5 d
ays
WT KO (D-) KO (D+)0
10
20
30
40
a
Proestrus
% o
f tim
e sp
ent i
npr
oest
rus
per 5
day
s
WT KO (D-) KO (D+)0
10
20
30
40
a
Estrus
% o
f tim
e sp
ent i
nes
trus
per
5 d
ays
(A) (B)
(C) (D)
KO (peripubertal Vit D3-)
Day
estr
ous
stag
e
0 5 10 15
D2
D1
E
P
KO (rescue Vit D3+)
Day
estr
ous
stag
e
0 5 10 15
P
E
D1
D2
(E) (F)
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Female reproductive physiology
estradiolovarian egg development
Communication between the brain and the ovaries change with increasing reproductive age.
Progesterone
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Objective #3
To determine if VD3 deficiency disrupts ovarian and/or hypothalamic-pituitary
physiology
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VD3 deficiency is associated with arrested follicular development
KO (D-) + saline KO (D-) + PMSG + hCG
CL
CLCL
CL
CL
VD3 deficiency does not affect ovarian responsiveness to superovulation
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Peripubertal VD3 deficiency does not affect diestrus
LH and FSH release?
N= 3-8
Follicle Stimulating Hormone
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Is VDR expressed in GnRH neurons?
Negative ControlGT1-7 KidneyGT1-7 Kidney
VDR
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Does peripubertal VD3 deficiency affect GnRH neuron density?
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VD3 deficiency does not affect the number of GnRH neurons
GnR
H ir
cells
0
20
40
60
80
in uterolactationperipubertal
D+D+D+
D+D+D-
VD3+
VD3-
Peripubertal VD3 deficiency does not affect GnRH neuron density
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1) Delays the puberty2) Reversibly disrupts estrous cyclicity 3) Does not primarily affect ovarian
physiology4) Does not affect GnRH neuron density5) Does not disrupt negative feedback
effects of estradiol during diestrus6) GT1-7 neurons express VDR
Summary of peripubertal VD3 deficiency
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1) Changes in dietary habits and reduced sun exposure have resulted in near epidemic levels of VD3 insufficiency & deficiency
2) Vitamin D3 insufficiency & deficiency disproportionately affect reproductive aged women, neonates and adolescents thereby making these groups more susceptible to the adverse consequences of VD3 deficiency on the reproductive axis
Conclusion
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AcknowledgmentsCary Dicken, MDJoe Davis, MDYan Sun, MD PhDJun Shu, MDDavelene Israel PhDAnne Etgen, PhDNanette Santoro, MDJohn Hardin MDStreamson Chua, MD PhD
SupportR21HD0663511 Zondek Award for Reproductive ResearchDepartment of Ob/Gyn Einstein College of Medicine
Cary Dicken REI fellow
Jun Shu, technician
Joe DavisREI fellow
Yan Sun Post Doc