Bag Cell Peptides

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CAT# Product Name M.W Molecular Formula Inquiry
B03001 Bag Cell Peptide 705.8 Inquiry
B03002 Bag Cell Peptide (1-7) 922.1 Inquiry
B03003 Bag Cell Peptide (1-8) 1009.2 Inquiry
B03004 Bag Cell Peptide (1-9) 1122.3 Inquiry
B03005 alpha-Bag Cell Peptide (1-9) 1122.3 C53H83N15O12 Inquiry
B03006 alpha-Bag Cell Peptide (1-7) 922.08 C44H67N13O9 Inquiry
B03007 alpha-Bag Cell Peptide (1-8) 1009.2 C47H72N14O11 Inquiry
E12001 Egg-laying-like hormone Inquiry
E12002 Beta-bag cell peptide 727.9 C33H53N13O6 Inquiry
E12003 Gamma-bag cell peptide 705.8 C31H51N11O8 Inquiry
E12004 Alpha-bag cell peptide Inquiry
E12005 Acidic peptide Inquiry
E12006 Atrial gland peptide A Inquiry
E12007 Califin-A large subunit Inquiry
E12008 Califin-A small subunit Inquiry
E12009 Atrial gland peptide B Inquiry
E12010 Califin-B large subunit Inquiry
E12011 Califin-B small subunit Inquiry
E12012 Califin-C large subunit Inquiry
E12013 Califin-C small subunit Inquiry


Bag cell peptides function in egg-laying by regulating the secretory activity of these cells, which also secrete a peptide egg-laying hormone (ELH). Bag cell peptides influence the electrophysiological properties of the bag cells and modulate cyclic adenosine monophosphate (cAMP) levels by influencing adenylyl cyclase activity. Bag cell peptides include α-bag cell peptides, β-bag cell peptides, and γ-bag cell peptides. The α-bag cell peptides contain three styles: (1-7), (1-8), and (1-9) and their amino acid sequences are Ala-Pro-Arg-Leu-Arg-Phe-Tyr, Ala-Pro-Arg-Leu-Arg-Phe-Tyr-Ser, and Ala-Pro-Arg-Leu-Arg-Phe-Tyr-Ser-Leu, respectively. The amino acid sequences of β-bag cell peptides and γ-bag cell peptides are -His and Arg-Leu-Arg-Phe-Asp. They all contain the Arg-Leu-Arg-Phe motif.

Mechanism of action

α-bag cell peptides were previously purified from bag cell extracts in three neuroactive forms: α-bag cell peptides (l-9), a nine amino acid peptide encoded on the ELH/bag cell peptides precursor protein, and two NH2-terminal fragments, α-bag cell peptides(l-8) and α-bag cell peptides (l -7). α-Bag cell peptide mimics the depolarization of bag cells induced during induction of inhibition of the upper left quadrant (LUQ) neurons and bag cell burst discharge by induced bag cells. β-Bag cell peptides depolarize and excite bag cells and stimulate bag cell adenylyl cyclase, but the effects of α-bag cell peptides and γ-bag cell peptides depend on temperature. At 15oC, a temperature at which Aplysia do not lay eggs, α-bag cell peptides hyperpolarize and inhibit these cells and inhibit adenylyl cyclase, whereas, at 20°C, which is permissive for egg laying, these peptides depolarize and excite and increase cAMP by stimulating adenylyl cyclase. γ-Bag cell peptides behave like α-bag cell peptides in that they regulate the cAMP system in a temperature-dependent fashion.

Application of Bag Cell Peptides

The bag cell peptide is secreted by Aplysia’s neuroendocrine bag cells and provides feedback regulation of bag cell excitability and cAMP levels. Therefore, bag cell peptides may be used to treat cancer and neurological related diseases.


  1. Dudek, F. E., & Tobe, S. S. (1978). Bag cell peptide acts directly on ovotestis of Aplysia californica: basis for an in vitro bioassay. General and comparative endocrinology, 36(4), 618-627.
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