Journal of Clinical Dermatology & Therapy Category: Clinical Type: Research Article

Elevated Prolactin Levels in Patients with Pemphigus Foliaceus

Amina Toumi1*, Khansa Chaabouni2, Abderrahmen Masmoudi3, Hamida Turki4, Fatma Ayedi5 and Hatem Masmoudi6
1 Department of immunology, Habib Bourguiba Hospital, Emirates College of Technology, Sfax, Tunisia
2 Department of biochimistry, Habib Bourguiba Hospital, Sfax, Tunisia
3 Department of dermatology, Hedi Chaker Hospital, Sfax, Tunisia
4 Department of dermatology, Habib Bourguiba Hospital, Sfax, Tunisia
5 Department of biochemistry, Habib Bourguiba Hospital, Sfax, Tunisia
6 Department of immunology, Habib Bourguiba Hospital, Sfax, Tunisia

*Corresponding Author(s):
Amina Toumi
Department Of Immunology, Habib Bourguiba Hospital, Emirates College Of Technology, Sfax, Tunisia

Received Date: Dec 07, 2015
Accepted Date: Jan 28, 2016
Published Date: Feb 15, 2016


Background: Pemphigus Foliaceus (PF) is a rare autoimmune bullous skin disease characterized by the production of pathogenic auto-antibodies against desmoglein 1 and the predominance of the Th2 profile. The quasi exclusivity of the disease in women in our country seems to be the direct consequence of a hormonal impregnation. This study aims to determine whether the serum levels of Follicle-Stimulating Hormone (FSH), Luteinizing Hormone (LH), Prolactin (PRL) and Estradiol (E2) affect PF patients in the endemic southern and whether a relationship exists between these hormones and IgE /IL-4 levels.

Methods: Blood hormones, IL-4 cytokine and IgE titers were measured in 14 women with PF and 14 controls.

Results: We found significantly higher mean serum levels of PRL in patients than in control group (p=0.023). Two patients (14.28%) have hyper-prolactinemia whereas in the control group no one has hyper-prolactinemia. The hormonal studies revealed hormonal abnormalities as dominant aspects observed in 70% of pre-menopausal PF patients. We also found a positive correlation between serum PRL levels and serum LH, IgE and IL-4 levels (r=0.593, p=0.025; r=0.679, p=0.008 and r=0.822, p<0.0001, respectively), a positive correlation between serum IL-4 levels and serum LH, FSH and IgE levels (r=0.75, p=0.002; r=0.668, p=0.009 and r=0.563, p=0.036, respectively) and a positive correlation between serum LH and FSH levels (r=0.948, p<0.001) in PF patients.

Conclusion: Our results suggest that PRL may play a role in the disease onset and highlight the importance of checking hormonal serum levels in patients with PF.


Autoimmunity; Interleukin-4; Pemphigus Foliaceus; Prolactin


Abs: Antibodies
E2: Estradiol
FSH: Follicle-Stimulating Hormone
LH: Luteinizing Hormone
PF: Pemphigus Foliaceus
PRL: Prolactin
Th: T helper


Pemphigus Foliaceus (PF) is a rare autoimmune bullous skin disease characterized by the presence of skin lesions and the production of pathogenic IgG4 auto-Antibodies (Abs) directed against desmoglein 1. The production of these auto-Abs requires a preceding interaction between B and antigen-specific T helper lymphocytes. This interaction is crucial to determine the isotype of Abs produced by B cells and the pattern of cytokines secreted by predominantly the T helper (Th) 2 cells such as Interleukin (IL)-4 [1]. The binding of the auto-Abs to desmosomal components induces a disjunction of desmosomal areas, which lead to the acantholysis and the formation of an intra-epidermal blister.

The clinical-epidemiological hallmarks of endemic PF, in addition to the universally immunologic mechanisms and genetic predisposition suggest the involvement of Hypothalamic-Pituitary-Gonadal (HPG) axis and hormonal factors in the aetiopathogenesis of the disease. Among these arguments we cited (i) the female predisposition, particularly during childbearing ages, (ii) the incidence of the disease in our country is even higher among young rural women (up to 20 cases/million inhabitants/year) [2-4] than in the general population (6 to 7 cases/million inhabitants/year) [2], (iii) the predictable clinical improvement during pregnancy and worsening in post-partum [5], and (iv) the increased familial or immunogenetic risks of PF in younger-onset disease [6].

Among the hormones which could be involved in the pathogenesis of this autoimmune disease we proposed the Follicle-Stimulating Hormone (FSH), the Luteinizing Hormone (LH), the Prolactin (PRL) and the Estradiol (E2). In fact, many previous studies showed that hormones; especially female hormones; can interact with the immune system and can influence immune responses of many autoimmune diseases that occur predominantly in women [7-10]. Furthermore, in vivo and in vitro data have demonstrated that hormones could stimulate the individual cytokines level and the antibody production [11-14]. The possible physiological explanations of the potential relationship between the disease activity and LH or FSH hormones in autoimmune diseases may be through T-cell maturation, T-cell activation, or direct stimulation of cytokine production [15-17]. On the other hand, E2 and PRL share a reciprocal endocrinologic relationship. In fact, both hormones may modulate B cell function directly as well as indirectly through modulation of Th2 cytokine production [18]. Inhibition or stimulation of mononuclear cells or their cytokines by E2 or PRL may suppress or exacerbate autoimmune disease appearance. PRL has been proposed as a triggering and/or promoting factor in autoimmune inflammation and it has been suggested that, according to the specific pathologic context, PRL can promote, be dispensable or even protect against autoimmune pathology [19]. Published reports have demonstrated that PRL enhances immunoglobulin production and may contribute to autoimmunity development through its action on all the three mechanisms of B cell tolerance induction (negative selection, receptor editing, and anergy) [20,21].

The role of hormones particularly sex hormones in the pathogenesis of PF has not been investigated until now, however, significant higher levels of PRL have been advanced as associated with severity of Pemphigus Vulgaris (PV), a second major subtype of pemphigus which is characterized by mucocutaneous blisters [22,23]. Kandpur and Reddy reported a strong association between the severity of PV and serum PRL level in a young woman [22]. In the second study, authors reported hyperprolactinemia in 25% of female patients (8 man and 16 women were included in this study) and a positive correlation between serum PRL levels and the extent of body surface involvement [23].

This study is conducted to determine whether the hormonal serum levels of FSH, LH, PRL and E2 are elevated in PF patients in the endemic southern area. As hormone and cytokine levels vary within the menstrual cycle and also before and after menopause [15], we hypothesized that these relative changes in hormone levels are associated with relative changes in the IL-4 cytokine and IgE levels, which production and/or regulation is dependent on Th2 cells [24]. Thus, we investigated the relationships between these hormones, IgE and IL-4 levels in post- and pre-menopausal PF patients.



This comparative case-control study, witch lasted for 1 year, was conducted in collaboration with the Department of Biochemistry of the Habib Bourguiba Hospital and the Department of Dermatology of the Hedi Chaker Hospital. All patients were diagnosed on clinical, histological (acantholysis in the upper epidermis either in the granular layer or immediately below with subcorneal bullous formation) and immunological criteria (cell surface staining) of PF [25]. Direct immunofluorescence showing IgG and/or C3 deposits most often located on the whole epidermis and less frequently predominating in the upper layers of the epidermis. Indirect immunofluorescence shows serum anti-Dsg1 Abs deposit, IgG Abs which mainly correspond to IgG4 antibodies. Anti-desmoglein 1 values were detected by a commercial ELISA kit (MBL®, Nagoya, Japan).

All blood samples were taken in the third day of periodic cycle. Women with PF were subdivided according to their pre-menopausal and post-menopausal status and were matched by age (± 5 years), sex and geographical origin to healthy controls. We excluded individuals (i) in period of pregnancy/lactation, (ii) with renal/hepatic failure, (iii) taking drugs that could alter serum hormones levels, such as antipsychotic medications and opium, (iv) taking oral contraceptives, and (v) also those with an abortion history.

All patients and healthy controls gave informed consentement to participate in the study.

Hormonal measurement

Blood samples, for both case and controls subjects, were taken in the morning after a period of absolute rest lasting 30 minutes and placed on ice within 2 hours of collection. Plasma was then immediately separated by centrifugation at 3000 rpm for 20 minutes. Serums were stored at -20°C until hormonal analysis were conducted. Serum concentrations of FSH (normal values 3.5-12.5 mIU/ml for pre-menopausal and 25.8-134.8 mIU/ml for postmenopausal women), LH (normal values 2.4-12.6 mIU/ml for pre-menopausal and 7.7-58.5 mIU/ml for post-menopausal women), PRL (normal values 4.79-23.3 ng/ml for women), E2 (normal values 18-147 pg/ml for pre-menopausal and <58 pg/ml for post-menopausal women), were evaluated using Electro Chemil Luminescence Immunassay (Elecsys®, Roche Diagnostics, Mannheim, Germany).

IgE antibodies

Total serum IgE was quantitated using BN ProSpec Nephelometer System (Siemens®, Germany) as described in manufacturer’s instructions (positive levels > 150 IU/ml).

IL-4 cytokine

IL-4 were detected in the serum of PF patients only, by commercially available ELISA Quantikine kits (R&D®, Minneapolis, Minn, USA), according to manufacturer’s procedure.

Statistical analysis

The statistical analysis was performed by SPSS version 13.0 (Chicago, IL, USA). The results are considered as mean and standard deviations or median (range) for continuous variables and as a number (%) for categorical variables. Data were compared by Student’s t-tests (n>10) or by the Mann-Whitney test (n≤10) for continuous variables to evaluate differences among PF patients and controls. P values less than 0.05 are considered significant. Pearson’s correlation coefficients were assessed in normally distributed data to describe the relationship between hormones, IL-4 and IgE levels. Univariate regression analyses (adjusting for age and sex) were also performed.


Characteristics of PF patients and controls

Clinical and demographic data of our study populations are shown in table 1. Fourteen PF women patients, 10 are pre-menopausal (Group I; mean age 35 ± 9.1 yrs) and 4 are post-menopausal (Group II; mean age 52.5 ± 5.25 yrs), in active stage of the disease are included in this study. The result is a support for the increased risk of PF, particularly during childbearing ages in young women. The clinical features of PF patients show 3 principal subgroup: (i) Endemic Pemphigus Foliaceus (EPF) characterized by generalized exfoliating dermatitis which occur in young adult women, (ii) Pemphigus Erythematosus (PE) which correspond to localized lesions on the face, scalp, chest and back and is often considered as a less severe form of the disease), and (iii) Pemphigus Herpetiformis (PH) is a rare variant of PF where lesions may mimic dermatitis herpetiformis.

Features Patients Healthy controls
Number 14 14
Age 40 ± 11.44 (24-60 yrs) 34,71 ± 11,2 (20-60 yrs)
Sex Female
Origin South of Tunisia
Clinical features    
Pre-menopausal group 5 EPF, 3 PE, 2 PH -
Menopausal group 3 EPF -
Marital Status 3 unmarried, 11 married 1 unmarried, 13 married
Number of pregnancies 2.93 ± 2.9 1.78 ± 1.47
Number of children 2.21 ± 2.57 1.71 ± 1.32
Disease 2 Osteoporosis 8 Obesity
IFI staining 14/14 0/14
Mean anti-desmoglein 1 values >200 UI/mL negative
Table 1: Pemphigus Foliaceus patients and controls characteristic’s.
EPF: Endemic Pemphigus Foliaceus; IFI: Indirect Immunofluorescence; PE: Pemphigus Erythematosus; PH: Pemphigus Herpetiformis
The control group consisted of 14 healthy individuals without any inflammatory or auto-immune disease. Mean age of the patients and control group were 40 and 34.71. No statistically significant difference was noted in the demographic analysis of the two groups.

Hormonal abnormalities as dominant aspects observed in PF patients

The hormonal studies showed hyperprolactinemia (37.82 ng/ml and 62 ng/ml) in two (14.28%) PF patients (one pre-menopausal and 1 post-menopausal woman). However, in the control group, no one had hyper-prolactinemia.

In the pre-menopausal PF subgroup, six (70%) had one or more hormonal abnormalities. Decreased E2 levels, reduced LH concentration and increased levels of FSH are observed in 42.85%, 42.85% and 28.57% of those patients, respectively. On the other hand, 2 patients have an inverted LH/FSH ratio. In contrast, no hormonal abnormalities were observed in control group (Table 2).
PF patients LH (2.4-12.6 mUI/ml) FSH (3.5-12.5 mUI/ml) E2 (18-147 pg/ml) Prolactine (4.79-23.3 ng/ml)
1 8.38? 3.8? 32.8 4.29
2 0.704* 7.66 <9¤ 9.3
3 1.6* 5.5 12.2¤ 12
4 9.5 18± 48.62 8.7
5 6.4? 3.9? 115.95 8.5
6 8.2 16.2± 13.7¤ 13.7
7 1.2* 6.3 19 9
8 6.44 6.37 38.6 17.9
9 2.95 4.53 41.78 37.82?
10 5.8 3.5 190.2+ 6.3-
Table 2: Hormonal abnormalities observed in pre-menopausal PF patients.
?: Inverted LH/FSH ratio; ¤: Low E2 level; +: High E2 level; *: Low LH level; ±: High FSH level; ?: High PRL level and -: Low PRL level

Hormone levels and IgE antibodies findings

Hormonal serum levels performed in the 14 PF patients and the 14 healthy controls are shown in table 3. We found that all hormones in the healthy controls were within the normal range. However, the mean serum PRL level in patients was significantly higher than in the control group (16.07 ± 15.78 ng/ml vs 5.86 ± 1.19 ng/ml; p=0.023; figure 1). We also found a significantly higher mean value of IgE Abs levels (271.96 ± 301.8 IU/ml vs 75.36 ± 88.76 IU/ml; p=0.027; figure 1) in patients than in the control group.
  Patients N=14



p Group I Group II
  Patients N=10 Controls N=10 p Patients N=4 Controls N=4 p
Age (years) 40 ± 11.44 34,71 ± 11,2 0.228 35± 9.1 29.2 ± 6.21 0.185 52.5 ± 5.25 48.5 ± 8.54 0.378
LH (mUI/ml) 14.85 ± 17.13 9.66 ± 15.76 0.412 5.11± 3.25 3.91 ± 1.09 0.384 39.21 ± 11.55 24.04 ± 26.21 0.248
FSH (mUI/ml) 28.98 ± 37.4 20.73 ± 33.33 0.543 7.57 ± 5.2 7.24 ± 2.14 0.364 82.52 ± 25.14 54.46 ± 51.76 0.248
LH/FSH 0.76 ± 0.63 0.52 ± 0.22 0.701 0.87 ±0.72 0.58 ± 0.2 0.76 0.49 ± 0.12 0.39 ± 0.25 0.564
E2 (pg/ml) 39.13 ± 52.38 31.23 ± 23.1 0.61 51.18 ± 58.3 37.53 ± 23.87 0.94 <9 9.5 ± 0.42 0.056
PRL (ng/ml) 16.07 ± 15.78 5.86 ± 1.19 0.023 12.75 ± 9.6 5.67 ± 1.07 0.004 25.88 ± 24.44 6.35 ± 1.53 0.021
IgE Abs (UI/ml) 271.96 ± 301.8 75.36 ± 88.76 0.027 359.36 ± 317.68 95.7 ± 98.7 0.034 53.47 ± 53.2 24.52 ± 9.49 0.561
Table 3: Mean of age, serum hormonal concentration and IgE titers in PF patients and healthy subjects.
Mean ± SD are shown

Figure 1: Serum PRL and IgE Abs levels in PF patients and healthy controls.
Mean levels of serum PRL and IgE Abs levels were significantly higher in patients than in the control group (p<0.05).

The mean sera concentration (± SD) of hormones and IgE Abs in pre-menopausal women (group I) with PF and premenopausal controls are summarised in table 3. PRL and IgE Abs levels were significantly higher in pre-menopausal PF women compared to pre-menopausal controls (12.75 ± 9.6 ng/ml vs 5.67 ± 1.07 ng/ml; p=0.004 and 359.36 ± 317.68 IU/ml vs 95.7 ± 98.7; p=0.034). Similarly, serum PRL levels were significantly higher in post-menopausal PF women (group II) compared to post-menopausal controls (25.88 ± 24.44 ng/ml vs 6.35 ± 1.53 ng/ml; p=0.021). The other hormonal data were unchanged in both groups (p>0.05). No significant difference of PRL and IgE Abs levels were found between pre- and post-menopausal PF women.

Correlation between hormone levels, IgE Abs and IL-4 in PF disease

Pearson’s correlation showed that serum PRL levels was positively correlated with serum LH, IgE Abs and IL-4 levels (r=0.593, p=0.025; r=0.679, p=0.008; r=0.822, p<0.0001, respectively). We also found a positive correlation between serum IL-4 levels and serum LH, FSH and IgE Abs levels (r=0.75, p=0.002; r=0.668, p=0.009; r=0.563, p=0.036) and strong positive correlation between serum LH and FSH levels (r=0.948, p<0.001) in PF patients (Table 4).
PRL ----- NS r=0.593 p=0.025 NS r=0.679 p=0.008 r=0.822 p<0.001
FSH   ----- r=0.948 p<0.001 NS NS r=0.668 p=0.009
LH     ----- NS NS r=0.750 p=0.002
E2       ----- NS NS
IgE         ----- r=0.563 p=0.036
IL-4           -----
Table 4: Significant correlations between hormone serum levels, IgE and IL-4 serum titers in PF disease.
Table shows values of r and minimal probabilities obtained after a Pearson’s correlations study between hormone serum levels, IgE Abs and IL-4 in 14 PF patients; NS: indicates no significant correlation


The female preponderance in endemic Tunisian PF disease has led to investigate the role of HPA axis activity in particular reproductive hormones in the pathogenesis of this disease. The female predominance was also verified in our prospective study which lasted for over a year. Indeed, we have compiled only female PF patients with a higher incidence of young women in childbearing age (10 pre- and 4 post-menopausal PF patients).

In this comparative case-control study, we found a significant high level of PRL hormone in PF patients compared to the healthy subjects and we also observed rates above normal range (hyper-prolactinemia) in 14% of these patients. Results of past studies have suggested a potential relationship between high levels of PRL and both organ and non-organ-specific autoimmune diseases [26].

PRL is produced by many extra pituitary sites, including immune cells and has multiple immunostimulatory effects [27,28]. At high concentration, PRL increases differentiation of monocytes to iDC (immature Dendritic Cells) and increases maturation of iDC to highly efficient antigen presenting mDC [29]. This may be a great of significance in initiating the response against Major Histocompatibility Complex (MHC)-presented self-antigens and may explain the association of high PRL concentration with autoimmune diseases. Different factors may promote hyperprolactinemia: (i) pro- or anti-inflammatory cytokines may cross the blood-brain barrier and stimulate PRL release (ii) defects in peptidergic modulators and dopamine metabolism may explain in part the hyperprolactinemia in PF or (iii) lymphocytes in active PF may increase production of PRL. According to the aforementioned, the significant increase of PRL concentrations found in our study indicates probably a high activity of the hypothalamic-pituitary axis in active disease. However, currently it is not clear if increase levels of PRL and hyper-prolactinemia are a primary phenomenon in the pathogenesis of the disease or occurs as a result of a specific endocrine axis involvement dependent on localisation of PF lesions or may merely represent an epiphenomenon associated with extensive and prolonged autoimmune response.

Another interesting point is positive significant correlations between hormones, IL-4 and IgE levels. The correlation between the PRL concentration and serum IL-4 levels indicates that PRL may enhance antibody switching through regulating IL-4 production, but this remains purely speculative. Possible physiological explanation for a potential association between disease activity and LH or FSH or PRL in PF may be through T-cell maturation, T-cell activation, or direct stimulation of cytokine production. We cannot rule out the possibility that the associations observed between LH/FSH/PRL and IL-4 cytokine or IgE serum levels may be due to their effects on the HPG axis rather than the action of LH or FSH or PRL directly or indirectly on IL-4 or IgE production; however these results suggest a direct intervention of the HPG axis in the pathogenesis of PF disease and support the possibility that immune-regulatory T-cell subsets in PF patients respond differently to LH, FSH or PRL compared with controls.

The lack of significant associations between E2 and IL-4 or IgE titers within PF patients, in comparison with control group and between pre-and post-menopausal patients give emphasis to our hypothesis that the link between the endocrine HPG axis and immune dysfunction is mainly central and PRL production is essentially extra pituitary, probably produced by immune cells. This link could be represented by PRL that can modulate GnRH pulsatility and thus FSH and LH levels. In fact, PRL seems to be the main factor; independent of age, LH/FSH ratio or E2; implicated in this immune dysfunction as it is positively correlated with IgE Abs and IL-4 levels and significantly higher in PF group than in control.

It is well known that pemphigus disease is associated with Th2 cells [1]. This Th2-dependency associates the IgG4 and IgE responses mainly during acute onset disease [30,31]. Indeed, in our study we also observed a significant increasing level of IgE Abs in patients than in controls. The requirements for the class switch to IgG4 and to IgE are similar and both depend on IL-4/IL-13 which production was probably induced or exacerbate by elevated levels of PRL in PF patients.


The role of female hormones in the development of PF is undoubtedly complex and challenging to study. Although its limitation due to relatively small number of patients, this preliminary study shows an interesting relationship between elevated serum levels of PRL, IL4 and IgE in PF patients. Further studies with larger cohorts and combining clinical and experimental data are needed to fully elucidate the role of HGP axis and especially PRL in the pathogenesis of this enigmatic disorder.


The authors declare no conflict of interest.


This work was supported by grants from DGRST (Direction Générale de la Recherche Scientifique et Technique, Tunisie).


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Citation: Toumi A, Chaabouni K, Abida O, Masmoudi A, Turki H, et al. (2016) Elevated prolactin levels in patients with Pemphigus Foliaceus. J Clin Dermatol Ther 3: 017.

Copyright: © 2016  Amina Toumi, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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